WIKA 73 tag:model:74 tag:model:74-8xx tag:model:75 Operating instructions

GB

P

Operating instructions

Manual de instruções

Examples/Exemplos

Gas actuated thermometers

Termómetro à pressão de gás

also per directive

também conforme a directiva

94/9/EG (ATEX)

GB

P

2

07/2010 P based on 07/2009 GB

WIKA operating instructions gas actuated thermometers

Operating Instructions Gas acutated thermometers Page 3 - 28

Manual de Instruções Termómetro à pressão de gás

Página 29 - 39

GB

Contents

1. Safety instructions 4

2. Description 4

3. Installation conditions and installation 4

4. Troubleshooting 7

5. Indicator check 7

6. Indicator correction 8

7. Switch contacts 8

8. Explosion protection 11

9. Maintenance and servicing / cleaning 13

10. Repairs 13

11. Disposal 13

Enclosure 1: Declaration of conformity for Model 73 and 74 14

Enclosure 2: Declaration of conformity for Model 76 15

Enclosure 3: Declaration of conformity for Models 73 and 74

with inductive contacts Model 831 16

Enclosure 4: EC-type examination certificate (Ex approval for

gases) for slot-type initiators types SJ (WIKA-Model 831) 17

Enclosure 5: EC-type examination certificate (Ex approval for

gases) for SN-sensors types SJ (WIKA-Model 831-SN/S1N) 20

Enclosure 6: EC-type examination certificate (Ex approval for

dust) for SN-proximity sensors types SJ (WIKA-Model 831

and 831-SN/S1N) 24

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WIKA operating instructions gas actuated thermometers 3

Contents

Information

This symbol provides you with information, notes and tips.

Warning!

This symbol warns you against actions that can cause injury

to people or damage to the instrument.

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1. Safety instructions ... 3. Installation conditions, installation

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WIKA operating instructions gas actuated thermometers 4

1. Safety instructions

The appropriate national safety regulations (i.e. VDE 0100 /

EN 60 079-14 / 837-2) must be observed when installing,

commissioning and operating these devices.

 Do not work on gauges with switch contacts unless the power has

been isolated

 Serious injury and/or damage can occur if the appropriate regulations

are not observed.

 Only appropriately qualified personnel should work on these instru-

ments.

2. Description

Gas actuated thermometers consist of a stem, a capillary and a case containing

the bourdon tube element. These components are connected to form a single

system. The complete measuring system is filled with an inert gas under

pressure.

Any temperature variation causes a change in the internal pressure of the

stem, leading to a deflection of the bourdon tube. A mechanical linkage

(movement) transmits this deflection to the pointer. Variations in the ambient

temperature acting on the case are compensated for by a bimetal element

mounted between the movement and the bourdon tube.

WIKA gas actuated thermometers are available for temperature ranges from

-80 ... +700 °C with an accuracy complying with Class 1 of EN 13 190.

3. Installation conditions and installation

 Before installing the probe, check whether the probe material used (speci-

fied in the delivery note) is chemically resistant/neutral to the medium being

measured. This also applies to thermowells.

 Ensure that all the necessary accessories for the mounting method ordered

have been supplied e.g. instrument mounting brackets, clamp straps for

panel mounting, contact adjustment buttons, etc..

The accessories will be either on the instrument or supplied in a separate

bag, which in most cases will be attached to the thermometer.

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3. Installation conditions and installation

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WIKA operating instructions gas actuated thermometers 5

3.1 Installation conditions

 If possible, the entire length of the stem should be exposed to the tempera-

ture to be measured, but, if not, it should at least be the length of the active

part (active length), which corresponds to the length of the gas expansion

vessel.

 In pipelines or other measuring points the temperature probe should be

directed as far towards the flow as possible.

 Heat conduction errors occur when the size, volume or area of the medium

to be measured is very small, so that the temperature probe becomes

noticeable as a thermal mass. Heat conduction errors may also occur

when the insertion length is not sufficient, or when the instrument mounting

fittings are attached to a good heat conductor (e.g. metal plates) and the

temperature difference between them and the medium to be measured is

very high.

 The indicator case must be mounted free of shock and vibration.

If necessary, the indicator can be isolated from the measuring point e.g. by

a flexible capillary between the two with the thermometer mounted on a

suitable instrument mounting bracket.

If this is not possible, the following limits must not be exceeded:

Dry gauges: Frequency range < 150 Hz

Acceleration < 0.7 g (7 m/s

2

)

Liquid-filled gauges: Frequency range < 150 Hz

Acceleration < 4 g (40 m/s

2

)

The liquid filling must be checked on a regular basis.

The liquid level must not drop below 75 % of the gauge diameter.

High shock and vibration leads to indication errors, increased wear in the

transmission mechanism and to fractures at welded and soldered joints.

In thermometers with integral contacts, the switches may chatter as a result

of vibrations, which can lead to increased wear of the contacts and a shift in

the contact set-point. By using magnetic snap-action contacts or slow-acting

relays, the effects of shocks and vibrations on contact thermometers can be

reduced, within certain limits.

3.2 Installation

When mounting a gauge with a screw fitting the sealing torque must not be

applied through the case or terminal box but only with a suitable tool using the

spanner flats provided for this purpose on the square connector shaft.

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3. Installation conditions and installation

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WIKA operating instructions gas actuated thermometers 6

When mounting a rotatable and inclinable gas-actuated thermometer, specific

instructions must be followed. In order to set the indicator to the desired

position, the following steps must be taken:

1. The lock nut or union nut must be loosened at the process connection.

2. The hexagon bolts and slotted screws at the swivel joint must be loosened.

3. Position the indicator as required, tighten the hexagon bolts and slotted

screws, and finally tighten the lock nut or union nut firmly.

 If a thermowell is used, the stem must not be allowed to touch the bottom

of the thermowell.

 Capillaries must be kink protected. The minimum bending radius for

capillaries should not be less than 6 mm. Any kinks or discontinuities in the

capillary may result in the failure of the instrument.

 If the probe is installed in a location which is exposed to shock and

vibration, it is essential that the capillary is coiled in several loops, and free

of tension between the last attachment point and the probe. Any excess

length should also be coiled into loops, as cutting the cable would make the

instrument unserviceable.

 Any welding or soldering of the capillary, as well as any permanent fastening

of the capillary, must be avoided, as this can severely damage the capillary,

and impair the operation of the instrument.

Installation with

spanner

loosen

Make sure to loosen the screws

on the opposite side as well!

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3. Installation conditions, installation ... 5. Indicator check

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WIKA operating instructions gas actuated thermometers 7

3.3 Ambient conditions

Unless the ingress protection of the thermometer's case is specifically identi-

fied in the order confirmation, the instrument must be protected from humid air

and other aggressive atmospheres.

The ambient temperature at the indicator case should be between 0 ... +40 °C in

order to ensure the best possible measuring accuracy. Higher or lower ambient

temperatures can lead to indication errors.

IP Ingress protection (EN 60 529 / IEC 529)

IP 66

IP 65 for thermometers with switch contacts

4. Troubleshooting

Gas-actuated thermometers, both with and without contacts, are

maintenance-free instruments according to their basic design. As measuring

instruments, their measuring accuracy should be checked at application-

specific intervals.

The wear condition of probes exposed to a permanent thermal stress (even

if this stress is very low), of electro-mechanical contacts and of capillaries

exposed to vibratory stress must be checked from time to time.

If any visible damage is found, the instrument must be replaced.

5. Indicator check

Indicator checks should only be carried out in comparison with a more

accurate instrument or, if possible, with a calibrated instrument. The tempera-

ture during the check must remain constant. Fluctuating temperatures can lead

to reading errors caused by the different response times of the probes.

Before checking the indicators of thermometers without thermowells, a waiting

time of at least 5 minutes with the stem‘s full length properly inserted is

required to allow temperature equalisation.

Temperature checks using thermometers with probes assembled with

thermowells can, in many cases, only result in a reference temperature at

the instrument under test, due to permanent heat dissipation caused by the

thermowell. In temperature applications fitted with static checking thermo-

meters (e.g. pipeline systems), permanent offsets in reference temperatures

can also be caused by the heat transfer path.

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5. Indicator check ... 7. Switch contacts

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WIKA operating instructions gas actuated thermometers 8

Ambient temperatures around the indicator housing which differ substantially

from room temperature can lead to steady indication errors with constant

ambient temperatures and to varying indication errors with fluctuating ambient

temperatures.

Permanent indication errors caused by the ageing of the measuring system

can be ignored, as they only account for a fraction of the indication accuracy.

6. Indicator correction

Any interference with or modification to the instrument will invali-

date the warranty!

Indicator corrections on gas-actuated thermometers with contacts may only

be carried out by the manufacturer or in adequately equipped workshops by

qualified persons.

 The micro-adjustment mechanism built into the pointer should only be

operated using a screwdriver, and only if the thermometer has been

damaged due to improper handling, severe shocks, during transport, etc.

 When correcting an indication error using the micro-adjustment mechanism,

a calibrated thermometer must be used for comparison.

 The thermometer can be opened by turning the bayonet-lock bezel of the

case counterclockwise using a strap wrench.

7. Switch contacts

Gas-actuated thermometers can be equipped with magnetic snap-action,

sliding, inductive or electronic contacts (see data sheet AC 08.01).

In most cases, gas-actuated thermometers with contacts are used as

two-position controllers for on-off control or as three-position controllers

for on-off-on control with adjustable dead-band. In general thermometers‘

contacts can only carry the operating current of an interposing control relay.

The contact mechanism consists of the red set pointer and the measured-

value pointer. The red set pointer can be adjusted using the supplied setting

tool. The measured-value pointer in a magnetic snap-action contact mecha-

nism consists of a pair of drag pointers, which are held against the red set

pointer by springs and is opened and closed at the set value by means of an

operating pin on the measured-value pointer.

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7. Switch contacts

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WIKA operating instructions gas actuated thermometers 9

 Electrical connection should only be carried out by qualified electricians.

 The switches are terminated on screw terminals within the terminal box.

 Conductor cross-section max. 1.5 mm

2

.

 The terminal assignment is stated on the connection plate of the thermometer.

To adjust red set pointers

The red set pointers for the switch contacts are adjustable via the adjustment

lock on the window using an adjustment key (included in delivery; on standard

gauges this is found on the outside edge of the junction box).

The red set pointers for the switch contacts are adjustable over the full range

of the instrument. Switching points should be set in the range between 10 %

and 90 % of the full scale, to ensure switching accuracy and the long life of the

measuring mechanism.

7.1 Magnetic snap-action contact Model 821 and sliding contact Model 811

Magnetic snap-action or sliding contacts are control switches which make or

break connected electric circuits as the contact arm, moved by the measured-

value pointer, reaches the appointed set-point.

Surface oxidation at the contact points may lead to malfunction, which can

result in contact-arcing, particularly in the case of intrinsically safe circuits (low

voltages and currents), and in the case of relatively high contact loads.

Since the indication must not be affected by the contact mechanism, actuating

forces, and therefore also the possible contact rating, are low.

Adjustment

key removable

Red set pointers

Adjustment lock

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7. Switch contacts

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WIKA operating instructions gas actuated thermometers 10

Sliding contacts are not suitable for liquid-filled instruments!

Magnetic snap-action or sliding contacts are not intrinsically safe and therefore

they are not suitable for applications in potentially explosive atmospheres!

Details see data sheet AC 08.01.

7.2 Inductive switch sensor Model 831

Inductive contacts are non-contact inductive proximity sensors, which make

or break when a control flag, linked to the measured-value pointer, moves

adjacent to or disengages from the control head (slot-type initiator). Changes

in the signal level will then actuate a control unit (switch amplifier).

Details see data sheet AC 08.01.

7.3 Electronic contact Model 830 E

Direct switching of low-level signals, which are typically used in conjunction

with a PLC, is possible using these inductive contacts, complete with

integrated amplifiers, factory-fitted within the instrument.

The usual advantages of inductive contacts are also valid for this system, such

as highly-secure contact operation, zero wear due to non-contact operation

and virtually no adverse effect on the measuring system, thus ensuring the

accuracy of the indication.

No additional control unit is required.

Electronic contact Model 830 E is not intrinsically safe and therefore not

suitable for applications in potentially explosive atmospheres!

Details see data sheet AC 08.01.

7.4 Electromagnetic compatibility

EMC per EN 60 947-5-2.

The instruments should be protected against strong electromagnetic fields.

7.5 Contact functions

The contact function of the respective switch contact is identified by the index

1 or 2 after the model number.

1 = Contact makes when the pointer approaches the set point in clockwise direction

2 = Contact breaks when the pointer approaches the set point in clockwise direction

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8. Explosion protection

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WIKA operating instructions gas actuated thermometers 11

a) When used in accordance with the intended use, these instruments have no potential

source of ignition and therefore do not fall within the scope of the Directive 94/9/EC (ATEX).

Source: ATEX 94/9/EC Chap. 1 Art. 1

b) When used in accordance with the intended use these instruments have no active

source of ignition and therefore do not fall within the scope of the Directive 94/9/EC (ATEX).

Source: ATEX 94/9/EC Chap. 1 Art. 1

Use of mechanical thermometer

models specified overleaf

Thermometer

with contact?

Glass

window?

Glass

window?

Inductive

contact ?

Plastic

window

≤ NS 100 ?

Plastic

window

≤ NS 100 ?

Use in

potentially

explosive

atmospheres

not possible

Use without Ex-specific

marking in Zones 1 and 2

(for gases, ignition groups IIA,

IIB, IIC) and Zone 21 or 22

(for dusts)

Manufacturer´s conformity

certivicate according to

Directive 94/9/EC (ATEX)

no

yes

no

no no

no

yes

see a)

see b)

8. Explosion protection

GB

8. Explosion protection

Circuit Sensor type Model designation EC-type exami-

nation certificate

WIKA-

Model

(s. Ex-certific.) Fa. Pepperl & Fuchs

Model 1

standard KFD2-SR2-Ex1 PTB 00 ATEX 2080 904.31

standard KFD2-SR2-Ex2 PTB 00 ATEX 2080 904.32

Model 2

standard KFA6-SR2-Ex1 PTB 00 ATEX 2081 904.28

standard KFA6-SR2-Ex2 PTB 00 ATEX 2081 904.29

SN-sensors KFD2-SH-Ex1 PTB 00 ATEX 2042 904.33

SN-sensors KFA6-SH-Ex1 PTB 00 ATEX 2043 904.30

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WIKA operating instructions gas actuated thermometers 12

The following gas-actuated instrument versions always require a certificate of

conformity issued by the manufacturer in accordance with the Directive

94/9/EC (ATEX), when operated in potentially explosive atmospheres:

 Combi-Thermometer with RTD (R7380, R7381)

 Combi-Thermometer with thermocouple (A7390, R7391)

8.1 Marking of instruments intended for use in potentially explosive

atmospheres

 WIKA Model

 Year of manufacture

 Lodged document number (approval number): 8000550764

8.2 EC-type examination certificates for inductive contacts Model 831

 Standard version Model 831.XX

PTB 99 ATEX 2219 X (enclosure 2) and ZELM 03 ATEX 0128 X (enclosure 4)

Depending on the number of switches and on the case diameter, either

Model SJ2-N ... or Model SJ3.5-...-N... is used.

 Safety pattern version Models 831.XX-SN or -S1N

PTB 00 ATEX 2049 X (enclosure 3) and ZELM 03 ATEX 0128 X (enclosure 4)

Depending on the number of switches and on the case diameter, either

Models SJ 2-SN..., SJ 2-S1N..., SJ 3.5-SN.. or SJ 3.5-S1N... are used.

The sensor type fitted is stated on the product label of the pressure gauge.

The permissible limits for U

i

, I

i

and P

i

for intrinsically safe supply circuits

depend on the sensor type. They can be taken from the corresponding

EC-type examination certificates.

(see also data sheet AC 08.01)

Suitable switch amplifiers are e.g.:

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8. Explosion protection ... 11. Disposal

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WIKA operating instructions gas actuated thermometers 13

For further information on explosion protection see manufacturer´s declaration

of conformity for the thermometer, EC-type examination certificate and

operating instructions for the electrical switch contacts (enclosed, where

applicable, for the respective instrument version).

9. Maintenance and servicing / cleaning

The instruments require no maintenance or servicing.

The indicator and switching function should be checked once or twice every

12 months. For this the instrument must be disconnected from the process

and checked using a temperature calibrator.

The instruments should be cleaned with a damp cloth, moistened with soap

solution. When cleaning the inside of the terminal box, the mains power must

be disconnected. All parts must be dry before the power is reconnected.

10. Repairs

Repairs are only to be carried out by the manufacturer or appropriately trained

personnel.

For further details see WIKA data sheet AC 08.01 or the data sheet for the

respective basic gauge.

11. Disposal

Disposal of instrument components and packaging materials should be in

accordance with the respective waste treatment and disposal regulations of

the region or country to which the instrument is supplied.

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WIKA operating instructions gas actuated thermometers 14

Enclosure 1:

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WIKA operating instructions gas actuated thermometers 15

Enclosure 2:

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Enclosure 4:

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WIKA operating instructions gas actuated thermometers 17

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Enclosure 4:

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Enclosure 5:

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Enclosure 5:

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Enclosure 6:

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WIKA operating instructions gas actuated thermometers 25

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