Gas Analysis
Installation and Operation Instructions
Original instructions
Sample gas probes
GAS 222.35 AMEX
BE460058
08/2019
Bühler Technologies GmbH, Harkortstr. 29, D-40880 Ratingen
Tel. +49 (0) 21 02 / 49 89-0, Fax: +49 (0) 21 02 / 49 89-20
E-Mail: [email protected]
Internet: www.buehler-technologies.com
Bühler Technologies GmbH, Harkortstr. 29, D-40880 Ratingen
Tel. +49 (0) 21 02 / 49 89-0, Fax: +49 (0) 21 02 / 49 89-20
Internet: www.buehler-technologies.com
E-Mail: [email protected]
Read this instruction carefully prior to installation and/or use. Pay at-
tention particularly to all advises and safety instructions to prevent in-
juries. Bühler Technologies can not be held responsible for misusing
the product or unreliable function due to unauthorised modifications.
All rights reserved. Bühler Technologies GmbH 2019
Document information
Document No......................................................... BE460058
Version.........................................................................08/2019
GAS 222.35 AMEX
Table of Contents
1 Introduction..................................................................................................................................................................................................................... 2
1.1 Intended Use.........................................................................................................................................................................................................2
1.2 Type Plate............................................................................................................................................................................................................... 2
1.3 Scope of Delivery..................................................................................................................................................................................................2
1.4 Ordering instructions ........................................................................................................................................................................................ 3
1.5 Product Description............................................................................................................................................................................................ 3
2 Safety instructions.........................................................................................................................................................................................................4
2.1 Important advice .................................................................................................................................................................................................4
2.2 General Hazard Warnings ................................................................................................................................................................................ 5
3 Transport and storage .................................................................................................................................................................................................. 7
4 Installation and connection ........................................................................................................................................................................................8
4.1 Installation site requirements.........................................................................................................................................................................8
4.2 Installation ............................................................................................................................................................................................................8
4.3 Installing the Inlet Filter ....................................................................................................................................................................................8
4.4 Insulation...............................................................................................................................................................................................................8
4.5 Connecting the Gas Line....................................................................................................................................................................................9
4.5.1 Blowback Connection......................................................................................................................................................................... 9
4.5.2 Connecting the Gas Line.................................................................................................................................................................... 9
4.5.3 Connecting the calibrating gas line (optional)..........................................................................................................................10
4.6 Connecting the Blowback and Pressure Vessel (Optional) ...................................................................................................................10
4.7 Electrical connections ......................................................................................................................................................................................10
4.7.1 Heated pressure vessel (optional) ..................................................................................................................................................11
5 Operation and Control.................................................................................................................................................................................................13
5.1 Before Start-Up ...................................................................................................................................................................................................13
6 Maintenance.................................................................................................................................................................................................................. 14
6.1 Maintaining the filter element ......................................................................................................................................................................15
6.1.1 Replacing the Inlet Filter .................................................................................................................................................................. 15
6.2 Blowback of the in-situ filter (within the process stream).................................................................................................................... 16
6.2.1 Manual Blowback (Without Blowback Control) ........................................................................................................................16
6.2.2 Automatic Blowback (External Blowback Control)...................................................................................................................16
6.3 Maintenance Schedule .....................................................................................................................................................................................17
7 Service and repair......................................................................................................................................................................................................... 18
7.1 Troubleshooting ................................................................................................................................................................................................ 18
7.2 Spare Parts and Accessories ........................................................................................................................................................................... 19
8 Disposal...........................................................................................................................................................................................................................20
9 Appendices......................................................................................................................................................................................................................21
9.1 Technical Data.................................................................................................................................................................................................... 21
9.2 Connection Diagram ........................................................................................................................................................................................ 21
9.3 Connection diagram heated pressure vessel............................................................................................................................................22
9.4 Flow diagram......................................................................................................................................................................................................22
9.5 Dimensions .........................................................................................................................................................................................................23
9.6 List of chemical resistance..............................................................................................................................................................................24
9.7 User book (Please make copies) .................................................................................................................................................................... 25
10 Attached Documents...................................................................................................................................................................................................26
iBühler Technologies GmbHBE460058 ◦ 08/2019
GAS 222.35 AMEX
1 Introduction
1.1 Intended Use
The sample gas probe is intended for installation into gas analysis systems in commercial applications.
Sample gas probes are among the main components in a gas conditioning system.
– Therefore also note the related drawing in the data sheet in the appendix.
– Before installing the device, verify the listed technical data meet the application parameters.
– Further verify all contents are complete.
Please refer to the type plate to identify your model. In addition to the job number/ID number, this also contains the article
number and model designation.
Please note the specific values of the device when connecting, and the correct versions when ordering spare parts.
Passing through gases
Flammable gases above the UEL may only be blown back with inert gases. Flammable gases from 25% LEL and up to the UEG
may be blown back provided the operator ensures the blown back gas is not and cannot be explosive. For safety reasons we re-
commend only using inert gases in these cases as well.
Blowing back explosive atmospheres (range from UEG to OEG) with the probes is prohibited due to possible adiabatic compres-
sion (high blowback pressure against contaminated filter). The operator is responsible for compliance with these conditions tak-
ing into account his risk assessment.
1.2 Type Plate
Example:
GAS 222.35 AMEX
100105177 462223516633000999999 001
Cl. 1, Div. 2, Gps. B, C, D, T3
CSA Certificate: 1728394
Install per drawing 46/115-Z01-06-4
115-230 V; max. 360W @ 230V
at -20 up to 80 °C; max. 6 bar
Manufacturer and address
Year: 2019
Type designation
Order no., Item no.
Blast protection marking
CSA certificate number
Drawing number
Item description
Year of manufacture
1.3 Scope of Delivery
– 1 x Sample gas probe
– 1 x Flange gasket and screws
– Product documentation
– Connection and mounting accessories (only optional)
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1.4 Ordering instructions
The item number is a code for the configuration of your unit. Please use the following model key:
4622235 1 6 6 X 3 X 0 0 X 9 X 9 9 9 Product Characteristics
1)
Ex temperature classes
3 T3
4 T4
Sample probe power supply
3 115 / 230 V
Calibration gas connection
0 No calibration gas connection
1 6 mm
2 6 mm + check valve
3 1/4"
4 1/4" + check valve
Blowback with air reservoir
2)
Air reservoir heating
1 Yes
9 No
Compressed air valve/valve voltage information
0 Manual
1 120 V 60 Hz
2 240 V 60 Hz
9 None (if no blowback requested)
Pneumatic drive for ball valve
9 N/A
Control valve for pneumatic drive
9 No control valve
1)
Please note, using certain accessories may limit gas probe use in Ex areas! Observe the respective operating manuals, accessory
compatibility charts, and data sheets to ensure proper technical product design!
2)
In the case of flammable gases, always use inert gas for blowback. Probe blowback prohibited when using explosive sample
gas!
1.5 Product Description
The probe is equipped with self-regulating PTC heating cartridges and a temperature contact.
Probe Description
GAS 222.35 AMEX Probe with retractable inlet filter and blowback connection
Accessories Please refer to the data sheet at the end of this manual for accessories for this probe
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2 Safety instructions
2.1 Important advice
This unit may only be used if:
– the product is being used under the conditions described in the operating- and installation instructions, used according to
the nameplate and for applications for which it is intended. any unauthorized modifications to the device will void the war-
ranty provided by Bühler Technologies GmbH,
– the limits in the data sheet and the instructions must be observed,
– the temperature switch is being operated on an intrinsically-safe circuit,
– the controller itself is installed outside the explosive area,
– Monitoring equipment / protection devices must be connected correctly,
– service and repairs not described in these instructions is performed by Bühler Technologies GmbH,
– using genuine replacement parts.
– Regulation IEC/EN60079-14 must be observed when erecting electrical systems in explosive areas.
– Additional national regulations pertaining to initial operation, operation, maintenance, repairs and disposal must be ob-
served.
– These operating instructions are a part of the equipment. The manufacturer reserves the right to change performance-, spe-
cification- or technical data without prior notice. Please keep these instructions for future reference.
Signal words for warnings
DANGER
Signal word for an imminent danger with high risk, resulting in severe injuries or death if not avoided.
WARNING
Signal word for a hazardous situation with medium risk, possibly resulting in severe injuries or death if not
avoided.
CAUTION
Signal word for a hazardous situation with low risk, resulting in damaged to the device or the property or
minor or medium injuries if not avoided.
NOTICE
Signal word for important information to the product.
Warning signs
These instructions use the following warning signs:
Warns of a general hazard General notice
Warns of voltage Unplug from mains
Warns not to inhale toxic gasses Wear respiratory equipment
Warns of corrosive liquids Wear a safety mask
Warns of explosive areas Wear gloves
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2.2 General Hazard Warnings
The maximum surface temperature of the probes solely varies by operating conditions
(steam temperature, sample gas inlet
temperature, ambient temperature, fluid flow rate). For use
in explosive areas
please particularly note the related hazard warn-
ings.
The equipment must be installed by a professional familiar with the safety requirements and risks.
Be sure to observe the safety regulations and generally applicable rules of technology relevant for the installation site. Prevent
malfunctions and avoid personal injuries and property damage.
The operator of the system must ensure:
– Safety notices and operating instructions are available and observed,
– The respective national accident prevention regulations are observed,
– The permissible data and operational conditions are maintained,
– Safety guards are used and mandatory maintenance is performed,
– Legal regulations are observed during disposal,
– compliance with national installation regulations.
Maintenance, Repair
Please note during maintenance and repairs:
– Repairs to the unit must be performed by Bühler authorised personnel.
– Only perform conversion-, maintenance or installation work described in these operating and installation instructions.
– Always use genuine spare parts.
Always observe the applicable safety and operating regulations in the respective country of use when performing any type of
maintenance.
DANGER Electrical voltage
Electrocution hazard.
a) Disconnect the device from power supply.
b) Make sure that the equipment cannot be reconnected to mains unintentionally.
c) The device must be opened by trained staff only.
d) Regard correct mains voltage.
DANGER Toxic, corrosive gas/condensate
Sample gas/condensate may be hazardous to health.
a) If necessary, ensure a safe gas/condensate discharge.
b) Always disconnect the gas supply when performing maintenance or repairs.
c) Protect yourself from toxic/corrosive gasses/condensate when performing mainten-
ance. Wear appropriate protective equipment.
DANGER Explosion hazard
Life and explosion risk may result from gas leakage due to improper use.
a) Use the devices only as described in this manual.
b) Regard the process conditions.
c) Check tubes and hoses for leakage.
DANGER Danger to life and explosion during installation and maintenance
The unit must not be worked on (assembly, installation, maintenance) in explosive at-
mospheres.
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DANGER
Use in explosive areas
Flammable gasses and dust could ignite or explode. Avoid the following hazard sources:
Application area!
Never operate the gas probe outside the specifications. Extracting gases or gas mixtures
which are also explosive in the absence of air is prohibited.
Electrostatic charge (sparking)!
The equipment may only be used where normal operating conditions do not frequently
produce flammable, electrostatic discharge.
Always clean plastic housing parts and decals with a damp cloth.
Sparking!
Protect the equipment from external blows.
Flame propagation!
If the process holds a risk of flame propagation, install a flame arrestor.
Adiabatic compression (explosion hazard)
Adiabatic compression may cause high gas temperatures during blowback.
Never blow-
back if gases are explosive
.
Only use
nitrogen (inert gas)
to blowback
flammable
gas
.
Dust:
If possible, take the electrical components which must be opened for repair to a dust-
free room. If unable to do so, prevent dust from entering the housing.
Ignition of dust layers!
When using the device in a dusty environment, routinely clean dust from all compon-
ents.
The ignition temperature resp. smouldering temperature of flammable dusts resp. dust
layers present must be considerably higher than the maximum surface temperature of
the probe (observe applicable standards and statutory regulations).
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3 Transport and storage
Only transport the product inside the original packaging or a suitable alternative.
The equipment must be protected from moisture and heat when not in use. They must be stored in a covered, dry and dust-free
room at a temperature between -20°C to 50°C (-4°F to 122°F).
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4 Installation and connection
4.1 Installation site requirements
Sample gas probes are intended for flange mounting.
– Installation site and installation position are determined based on requirements specific to the application.
– If necessary, the connection piece should be slightly tilted toward the centre of the channel.
– The installation site should be protected from the weather.
– In addition, adequate and safe access for installation and future maintenance work should be provided. Particularly follow
the uninstalled size of the probe tube!
If the probe is transported to the installation site in pieces, it will first need to be assembled.
4.2 Installation
DANGER Danger to life and explosion during installation and maintenance
The unit must not be worked on (assembly, installation, maintenance) in explosive at-
mospheres.
DANGER Explosion hazard
When used in explosive areas
Flammable gasses and dust could ignite or explode.
Never operate the gas probe outside the specifications. Extracting gases or gas mixtures
which are also explosive in the absence of air is prohibited.
DANGER Explosion hazard due to ignition of dust
When using the device in a dusty environment, routinely clean dust from all compon-
ents.
The ignition temperature resp. smouldering temperature of flammable dusts resp. dust
layers present must be considerably higher than the maximum surface temperature of
the device (observe applicable standards and statutory regulations).
If possible, take the electrical components which must be opened for repair to a dust-
free room. If unable to do so, prevent dust from entering the housing.
DANGER Explosion hazard due to flame propagation
Severe injuries and damage to the system
If the process holds a risk of flame propagation, install a flame arrestor.
4.3 Installing the Inlet Filter
The inlet filter, if necessary with matching extension, must be screwed in. The probe is then attached to the mating flange using
the included seals and screws.
4.4 Insulation
On heated probes completely insulate any exposed flange areas and, if applicable, the connection piece to absolutely prevent
thermal bridges. The insulating material must meet the application requirements and be weatherproof.
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4.5 Connecting the Gas Line
The sample gas line must be carefully and properly connected using a suitable fitting.
This table provides an overview of the sample gas probe connections:
Probe
GAS 222
Reservoir
PAV01
Ball valve
pneumatic drive
Control valve
3/2-way solenoid
valve
Connecting flange
1)
DN65/PN6/
DN3“-150
2)
Sample gas inlet G3/4
Sample gas outlet NPT 1/4
Blowback connection G3/8
Test gas connection
1)
Tube Ø6 mm
Tube Ø1/4
2)
Filling port NPT 1/4
Condensate G1/2
Bypass NPT 1/4
Control air G1/8 G1/4
NPT 1/4
Tab.1: Gas Probe Connections (Varies by Model)
1)
Varies by version.
2)
Only GAS 222.xx ANSI and GAS 222.xx AMEX
WARNING Gas emanation
Sample gas can be harmful to the health!
Check the lines for leaks.
4.5.1 Blowback Connection
If the probe has a G3/8 blowback connection, without factory installed blowback device it will be open. The blowback connection
must be sealed gas-tight prior to start-up.
DANGER Toxic, corrosive gasses
Explosive or toxic gases can develop due to a leaking or open blowback connection.
4.5.2 Connecting the Gas Line
Please note the following items when connecting the sample gas line (NPT 1/4") on heated probes to prevent thermal bridges:
– Choose the shortest possible screw connection.
– Shorten the connection pipe for the sample gas line as much as possible. To do so, remove the insulation around the sample
gas line. This is done by loosening the fixing bolts.
CAUTION Fragile
The insulation is fragile. Handle with care, do not drop.
After connecting the sample gas line it must be braced and secured with the clamp.
Long sample gas lines may require additional support clamps along the way to the analysis system! Once all lines have been
connected and checked for leaks, carefully reinstall and secure the insulation.
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WARNING Gas emanation
Sample gas can be harmful to the health!
Check the lines for leaks.
4.5.3 Connecting the calibrating gas line (optional)
Connecting the calibrating gas line requires a Ø6 mm or Ø1/4” pipe fitting.
If the calibrating gas connection was ordered with check valve, a Ø6 mm or Ø1/4” pipe can be connected directly to the check
valve.
4.6 Connecting the Blowback and Pressure Vessel (Optional)
The air lines must be connected carefully and properly, using suitable fittings.
If the probe is equipped with pressure vessel for efficient blowback (optional), a manual shut-off valve (ball valve) must be in-
stalled in the air supply, immediately upstream from the pressure vessel.
On probes used to sample flammable gas, nitrogen (inert gas) must be used for blowback. Blowback of explosive gases is prohib-
ited.
NOTICE
The operating pressure of the compressed air (inert gas) required for blowback must al-
ways be higher than the process pressure.
Required pressure differential min. 3 bar (44 psi).
DANGER Broken pressure vessel
Gas leak, danger due to flying parts.
Maximum operating pressure of the pressure vessel 10 bar (145 psi)!
The operating pressure reduces based on the operating voltage (see solenoid valve type
plate).
DANGER Adiabatic compression during gas blowback (explosion hazard)!
Adiabatic compression may cause high gas temperatures and must be checked by the
user.
Gas blowback may result in high gas temperatures due to adiabatic compression. This
can cause flammable gases to ignite spontaneously.
a) Blowback of explosive atmosphere / gases is prohibited.
b) Flammable atmosphere / gases (non-explosive) may only be blown back with nitro-
gen (inert gas).
4.7 Electrical connections
WARNING Hazardous electrical voltage
The device must be installed by trained staff only.
CAUTION Wrong mains voltage
Wrong mains voltage may damage the device.
Regard the correct mains voltage as given on the type plate.
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CAUTION Equipment damage
Cables damaged
Do not damage the cable during installation. Install a strain relief for the cable connec-
tion. Secure the cable against twisting and loosening. Please note the temperature res-
istance of the cables (> 100°C/212°F).
The probe includes two cubic plugs per EN 175301-803 (ex DIN43650) and a junction box. The plugs are prewired to the junction
box. For safety reasons this connection must not be modified. The electrical connections must only be run to the terminals of the
junction box.
The power supply for the two heating cartridges (mains supply 115/230V, 50/60 Hz) and the connection for the thermal alarm
contact are provided via the terminal strip in the junction box. Per EN 60079-14 and -15, connection for the alarm output must
be connected energy-limited (U
max
= 30 V, I
max
= 100 mA). Please see the enclosed terminal diagram for the connection.
– Only use cables with a temperature resistance of >100°C to connect to power.
– Make sure the connecting cable has sufficient strain relief (match cable diameter to the seal on the cubic plug).
– Please note, the heating system briefly has high starting currents (max. 6A). Use a suitable fuse (8A). When connecting,
please also observe the applicable Ex protection regulations.
NOTICE
The thermal alarm contact must be connected energy-limited!
(U
max
= 30 V, I
max
= 100 mA)
WARNING High voltage
Damage to the device in case of insulation testing
Do not proceed insulation tests with high voltage
to the device as a whole!
Electric strength test
The necessary tests of all assemblies required to be tested were carried out at the factory (test voltage 1 kV or 1.5 kV depending
on component).
To check the electric strength again yourself, only do so on the respective individual components.
– Now perform the electric strength test against earth.
4.7.1 Heated pressure vessel (optional)
A heated blowback vessel may optionally be used for blowback. Heated via self-regulating PTC heating cartridge to protect
against frost.
The electrical (mains connection 115/230 V AC) connects via the junction box per the enclosed terminal diagram at the end.
– Only use cables with a temperature resistance of >100°C to connect to power.
– Make sure the connecting cable has sufficient strain relief (match cable diameter to the seal on the junction box).
– When connecting, also observe the applicable Ex protection regulations and general warnings in these operating instruc-
tions.
CAUTION Equipment damage
Cables damaged
Do not damage the cable during installation. Install a strain relief for the cable connec-
tion. Secure the cable against twisting and loosening. Please note the temperature res-
istance of the cables (> 100°C/212°F).
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DANGER Adiabatic compression during gas blowback (explosion hazard)!
Adiabatic compression may cause high gas temperatures and must be checked by the
user.
Gas blowback may result in high gas temperatures due to adiabatic compression. This
can cause flammable gases to ignite spontaneously.
a) Blowback of explosive atmosphere / gases is prohibited.
b) Flammable atmosphere / gases (non-explosive) may only be blown back with nitro-
gen (inert gas).
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5 Operation and Control
NOTICE
The device must not be operated beyond its specifications.
NOTICE
The weather hood must be closed during operation!
WARNING Housing or component damage
Never exceed the maximum working pressure and temperature range of the drive.
DANGER Explosion hazard due to electrostatic discharge
Equipment may only be used where normal operating conditions do not produce fre-
quent flammable, electrostatic discharge.
5.1 Before Start-Up
Before starting the device, verify:
– The hose and electrical connections and the heating tape are not damaged and installed correctly.
– No parts of the sample gas probe have been removed.
– The protection and monitoring devices are installed and functional (e.g. flame arrester).
– The gas inlet and outlet on the gas probe are open.
– Ambient parameters are met.
– Probe parts are resistant to media to be conveyed and in the surrounding area.
– The performance specifications in the type plate are met.
– The voltage and frequency of the heating tape match the mains values.
– The temperature has an energy-limited connection (U
max
= 30V, I
max
= 100 mA).
– The electrical connections are tight.
– The monitoring equipment is connected and set as specified.
– All connection cables are installed without strain.
– Precautions have been taken; earthing.
– The junction box cover is closed and the cable gland is properly sealed.
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6 Maintenance
– Damaged parts must be replaced immediately.
– Regularly check the function of the electrical protection.
During maintenance, remember:
– The equipment must be maintained by a professional familiar with the safety requirements and risks.
– Only perform maintenance work described in these operating and installation instructions.
– When performing maintenance of any type, observe the respective safety and operation regulations.
DANGER Danger to life and explosion during installation and maintenance
The unit must not be worked on (assembly, installation, maintenance) in explosive at-
mospheres.
DANGER Electrical voltage
Electrocution hazard.
a) Disconnect the device from power supply.
b) Make sure that the equipment cannot be reconnected to mains unintentionally.
c) The device must be opened by trained staff only.
d) Regard correct mains voltage.
DANGER Toxic, corrosive gases
The measuring gas led through the equipment can be hazardous when breathing or
touching it.
a) Check tightness of the measuring system before putting it into operation.
b) Take care that harmful gases are exhausted to a save place.
c) Before maintenance turn off the gas supply and make sure that it cannot be turned
on unintentionally.
d) Protect yourself during maintenance against toxic / corrosive gases. Use suitable pro-
tective equipment.
CAUTION Hot surface
Risk of burns
Depending on the operating parameters, the housing temperature may reach over 100
°C during operation.
Allow the unit to cool down before performing maintenance.
CAUTION Excess pressure
The unit mustn’t be pressurised or energised when opened.
If necessary, close the gas supply and ensure a safe pressure on the process end before
opening.
DANGER Dangerous electrostatic charge (explosion hazard)
Incendive electrostatic charges may occur when cleaning plastic housing parts and
decals (e.g. with a dry cloth or compressed air). The sparks this produces could ignite
flammable, explosive atmospheres.
Always clean plastic housing parts and decals
with a damp cloth
!
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DANGER Explosion hazard due to ignition of dust
When using the device in a dusty environment, routinely clean dust from all compon-
ents.
The ignition temperature resp. smouldering temperature of flammable dusts resp. dust
layers present must be considerably higher than the maximum surface temperature of
the device (observe applicable standards and statutory regulations).
If possible, take the electrical components which must be opened for repair to a dust-
free room. If unable to do so, prevent dust from entering the housing.
6.1 Maintaining the filter element
The probes feature a particle filter which needs to be changed as it becomes dirty.
To do so, disconnect the voltage supply and if applicable close the shut-off valve to the process or switch off the process.
CAUTION!Do not damage the rear filter seat.
NOTICE
Ceramic filter elements
are very brittle by nature. Handle them with care, don’t let them
fall.
Filter elements made out of sintered stainless steel
can be cleaned in an ultrasonic bath
and be used several times as long as both seals are still in proper conditions.
6.1.1 Replacing the Inlet Filter
The probes are equipped with an inlet filter which is always inside the process stream. The filter is suitable for blowback with
compressed air (inert gas), i.e. blowing air (inert gas) through the filter from the inside to the outside to remove adhering
particles. When sampling flammable gases, nitrogen (inert gas) must be used for blowback. Blowback of explosive gases is pro-
hibited.
The effectiveness of cleaning a filter within a process is directly influenced by the available airflow (amount of gas). We there-
fore recommend using a pressure vessel directly on the probe.
With sufficient inlet filter blowback (within the process stream) the probes are maintenance-free. However, due to process con-
ditions the filter may clog over time. In this case the filter element will need to be replaced.
Proceed as follows:
– Slightly push in the handle at the back of the probe and turn 90° (handle must then be horizontal) and remove.
– Screw the dirty filter element out of the handle.
– Check the sealing faces on the handle, replace O-rings, then install the filter element and new seal. (The spare filter includes
O-rings and seals).
– Then insert the handle with the new or cleaned filter, push in slightly and turn 90° (handle must then be vertical). Pull on the
handle to verify the filter element is firmly seated.
NOTICE
The weather hood can only be closed again when the handle is completely vertical. In or-
der to do so, loosen the hood from the locking supports by lifting slightly and then fold
down. Ensure that the hood lock clicks into place correctly.
Condensate inside the pressure vessel
Depending on the installation site and application conditions a small amount of condensate may form inside the blowback air
pressure vessel. Open the drain screw at the bottom of the vessel and drain the condensate at least once a year.
If the probe needs to be serviced more frequently due to operating conditions, we recommend also draining the condensate at
these intervals.
CAUTION High pressure
Pressure vessel under pressure.
Before opening the condensate drain, close the air supply to the blowback control and
drain the vessel by manual blowback.
Pressing the main switch for the blowback control to interrupt the voltage supply.
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6.2 Blowback of the in-situ filter (within the process stream)
DANGER Adiabatic compression during gas blowback (explosion hazard)!
Adiabatic compression may cause high gas temperatures and must be checked by the
user.
Gas blowback may result in high gas temperatures due to adiabatic compression. This
can cause flammable gases to ignite spontaneously.
a) Blowback of explosive atmosphere / gases is prohibited.
b) Flammable atmosphere / gases (non-explosive) may only be blown back with nitro-
gen (inert gas).
Be sure to use filtered air with a minimum rating of PNEUROP / ISO Class 4 for blowback:
Class Particles / m
3
Particle size:
(1 to 5) µm
Pressure dew point
[°C]
Residual oil content
[mg / m
3
]
4
to 1000
(no particles ≥ 15 µm)
≤ 3 ≤ 5
6.2.1 Manual Blowback (Without Blowback Control)
The shut-off valve in the air supply (inert gas supply) to the pressure vessel must be open. The optional pressure gauge on the
pressure vessel shows the current operating pressure.
–
Abruptly
open the ball valve in the connecting line from the pressure vessel to the probe until the display on the pressure
gauge has dropped to the lowest reading.
6.2.2 Automatic Blowback (External Blowback Control)
Automatic blowback requires a shut-off valve downstream from the probe. The control unit for the system is designed for se-
quential valve control, i.e.:
1. Closing the shut-off valve downstream from the probe with a controller.
2. Open the solenoid valve between the pressure vessel and probe for approx. 10 seconds.
3. Open the shut-off valve downstream from the probe again.
Blowback can also be set as a closed process at intervals ranging from several minutes to hours or even days based on require-
ments.
16 Bühler Technologies GmbH BE460058 ◦ 08/2019
GAS 222.35 AMEX
6.3 Maintenance Schedule
NOTICE
When using the probe in explosive areas the maintenance schedule must be observed!
Maintenance schedule for normal ambient conditions:
Component Interval in operating
hours
Work to be performed To be performed by
Entire probe every 8000 h – Check gas connections
– Check safety devices and controllers
– Check electrical protective measures
– Proper function, dirt, visual inspection for dirt / dam-
age.
If damaged, replace or have repaired by Bühler.
Operator
Ball valves every 8000 h – Check ball valve function and check for leaks. Operator
Filter every 8,000 h – Check dirt level of filter. Operator
Seals every 8,000 h – Replace O-rings.
– Replace seals after every filter change.
Operator
Pressure vessel every 8,000 h – Drain condensate Operator
Entire probe
With respect to the
ball valve and solenoid
valves
after 20,000 h or
3years
– Inspection by Bühler Service technician /
Bühler
17Bühler Technologies GmbHBE460058 ◦ 08/2019
GAS 222.35 AMEX
7 Service and repair
This chapter contains information on troubleshooting and correction should an error occur during operation.
Repairs to the unit must be performed by Bühler authorised personnel.
Please contact our Service Department with any questions:
Tel.: +49-(0)2102-498955
or your agent
If the equipment is not functioning properly after correcting any malfunctions and switching on the power, it must be inspected
by the manufacturer. Please send the equipment inside suitable packaging to:
Bühler Technologies GmbH
- Reparatur/Service -
Harkortstraße 29
40880 Ratingen
Germany
Please also attach the completed and signed RMA decontamination statement to the packaging. We will otherwise be unable to
process your repair order.
You will find the form in the appendix of these instructions, or simply request it by e-mail:
.
7.1 Troubleshooting
CAUTION Risk due to defective device
Personal injury or damage to property
a) Switch off the device and disconnect it from the mains.
b) Repair the fault immediately. The device should not be turned on again before elim-
ination of the failure.
Problem / malfunction Possible cause Action
No or reduced gas flow – Filter element clogged – Clean or replace filter element
– Gas circuit clogged – Clean sampling tube
– Ball valve closed – Open ball valve
– Blowback (optional) not responding – Check compressed air supply
– Check solenoid valve, check pneumatic con-
trol
No heat output – No/incorrect power supply – Check power supply
Condensation forming – Heater defective – Send in probe for repair
– Thermal bridges at the sampling point – Insulate to eliminate thermal bridges
18 Bühler Technologies GmbH BE460058 ◦ 08/2019
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Buhler GAS 222.21 AMEX Installation And Operation Instructions Manual
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