M212504EN-A
User Guide
MGP260 Series Multigas Probes for Methane,
Carbon Dioxide, and Humidity Measurement
MGP260
PUBLISHED BY
Vaisala Oyj
Vanha Nurmijärventie 21, FI-01670 Vantaa, Finland
P.O. Box 26, FI-00421 Helsinki, Finland
+358 9 8949 1
Visit our Internet pages at www.vaisala.com.
© Vaisala 2020
No part of this document may be
reproduced, published or publicly
displayed in any form or by any means,
electronic or mechanical (including
photocopying), nor may its contents be
modified, translated, adapted, sold or
disclosed to a third party without prior
written permission of the copyright holder.
Translated documents and translated
portions of multilingual documents are
based on the original English versions. In
ambiguous cases, the English versions are
applicable, not the translations.
The contents of this document are subject
to change without prior notice.
Local rules and regulations may vary and
they shall take precedence over the
information contained in this document.
Vaisala makes no representations on this
document’s compliance with the local
rules and regulations applicable at any
given time, and hereby disclaims any and
all responsibilities related thereto.
This document does not create any legally
binding obligations for Vaisala towards
customers or end users. All legally binding
obligations and agreements are included
exclusively in the applicable supply
contract or the General Conditions of Sale
and General Conditions of Service of
Vaisala.
Table of contents
1. About this document.....................................................................................7
1.1 Version information.......................................................................................... 7
1.2 Related manuals................................................................................................7
1.3 Documentation conventions............................................................................7
1.4 Trademarks........................................................................................................ 8
2. Product overview............................................................................................ 9
2.1 Introduction to MGP260 series....................................................................... 9
2.2 Basic features and options.............................................................................. 9
2.2.1 Hazardous area safety...............................................................................9
2.2.2 Measurement parameters.......................................................................10
2.2.3 Wet basis and dry basis measurement output.................................... 10
2.2.4 Connectivity to Vaisala Insight software................................................11
2.3 Probe parts.......................................................................................................12
2.3.1 Lead-through options and breather plug............................................. 13
2.4 Measurement principle................................................................................... 14
2.5 Using MGP260 series probes in hazardous locations.................................16
2.5.1 Guidelines for safe use in hazardous conditions.................................. 17
3. Installation.......................................................................................................20
3.1 Overview......................................................................................................... 20
3.1.1 NPT 1.5" thread test plug 257525SP..................................................... 20
3.1.2 Installation preparations........................................................................ 20
3.1.3 Installation option: ball valve installation.............................................. 21
3.1.4 Installation option: flow-through adapter installation........................22
3.1.5 MGP260 dimensions...............................................................................24
3.1.6 Recommended installation position on pipeline.................................24
3.1.7 Gas safety during installation................................................................ 25
3.2 Preparing probe for installation....................................................................26
3.3 Inserting probe into process and opening connection box.......................27
3.4 Wiring ..............................................................................................................28
3.4.1 Wiring diagram....................................................................................... 30
3.5 Finalizing installation...................................................................................... 31
3.6 Attaching flow-through adapter to MGP260...............................................31
4. Operating with Insight software............................................................ 34
4.1 Vaisala Insight software................................................................................. 34
4.1.1 Basic and Advanced user modes.......................................................... 34
4.2 Connecting to Insight software.................................................................... 35
4.2.1 Installing the driver for the USB service cable.................................... 36
4.3 Insight main view............................................................................................37
5. Modbus............................................................................................................. 38
5.1 Configuring Modbus communication settings with Insight......................39
Table of contents
1
6. Analog output configuration...................................................................40
6.1 Overview.........................................................................................................40
6.2 Configuring analog outputs with Modbus..................................................40
6.3 Configuring analog outputs with Insight....................................................40
6.4 Changing units in Insight................................................................................41
6.5 Wet basis and dry basis measurement parameters...................................42
7. Environmental compensation................................................................. 43
7.1 Overview......................................................................................................... 43
7.1.1 Temperature compensation...................................................................43
7.1.2 Pressure compensation..........................................................................43
7.1.3 Compensation mode during calibration.............................................. 44
7.2 Configuring environmental compensations with Modbus........................44
7.3 Configuring environmental compensations with Insight..........................44
7.3.1 Configuring setpoint values for compensations with Insight........... 46
7.3.2 Using probe measurement as temperature compensation...............46
7.3.3 Using compensation received from external temperature
or pressure sensor...................................................................................46
7.3.4 Configuring input from external analog pressure or
temperature sensor.................................................................................47
8. Calibration.......................................................................................................49
8.1 Calibration recommendations...................................................................... 49
8.2 Calibration overview......................................................................................49
8.2.1 Compensation mode during calibration.............................................. 50
8.2.2 Flow-through adapter............................................................................50
8.3 Calibration and adjustment with Insight PC software............................... 52
8.3.1 Example: 2-point adjustment with zero point adjustment................ 53
8.3.2 Zero point adjustment............................................................................ 53
8.3.3 Calibrating and adjusting methane (CH
4
) measurement...................54
8.3.4 Calibrating and adjusting carbon dioxide (CO
2
) measurement........ 55
8.3.5 Calibrating and adjusting temperature measurement....................... 56
9. Maintenance....................................................................................................58
9.1 Maintenance overview................................................................................... 58
9.2 Filter change................................................................................................... 58
9.3 Removing probe from process..................................................................... 59
9.4 Cleaning the probe........................................................................................ 60
9.5 Sending probe to Vaisala................................................................................61
10. Technical data................................................................................................ 63
10.1 Specifications..................................................................................................63
10.2 Flow-through adapter dimensions.............................................................. 66
10.3 MGP260 dimensions...................................................................................... 67
10.4 Wetted parts material information.............................................................. 68
10.5 Recycling instructions....................................................................................68
MGP260 User Guide M212504EN-A
2
Appendix A: Modbus reference.................................................................. 70
A.1 Modbus registers............................................................................................70
A.1.1 Measurement data registers.................................................................. 70
A.1.2 Configuration registers........................................................................... 72
A.1.3 Status registers........................................................................................82
A.1.4 Device identification objects................................................................. 85
Maintenance and calibration.........................................................................87
Warranty............................................................................................................ 87
Technical support............................................................................................ 87
Recycling........................................................................................................... 87
Table of contents
3
List of figures
Figure 1 Output parameter selections in Vaisala Insight PC software.............. 10
Figure 2 MGP260 probe parts (closed and opened view)....................................12
Figure 3 Lead-through options and breather plug ................................................ 13
Figure 4 Probe cuvette with mirror and sensor chips............................................ 14
Figure 5 Measurement in the measurement cuvette..............................................15
Figure 6 MGP260 Ga/Gb division.................................................................................17
Figure 7 NPT 1.5" thread test plug.............................................................................. 20
Figure 8 MGP260 installation example with wiring routes and
recommended orientation and depth.......................................................22
Figure 9 MGP260 in flow-through adapter 258877............................................... 23
Figure 10 MGP260 dimensions in millimeters and inches......................................24
Figure 11 Recommended MGP260 installation position on pipeline.................. 24
Figure 12 MGP260 screw terminal markings and cable routes.............................28
Figure 13 MGP260 wiring diagram...............................................................................30
Figure 14 Connecting probe to Insight........................................................................ 35
Figure 15 Insight main menu and settings..................................................................37
Figure 16 Modbus communication settings in Insight PC software.................... 39
Figure 17 Analog output configuration options in insight.....................................40
Figure 18 Unit Selection in Insight................................................................................. 41
Figure 19 Output parameter selections in Vaisala Insight PC software..............42
Figure 20 Measurement menu view in Insight PC software ..................................45
Figure 21 Analog input 1 configuration menu in Insight......................................... 47
Figure 22 Flow-through adapter 258877..................................................................... 51
Figure 23 Calibration menu view in Insight PC software........................................ 52
Figure 24 Zero point adjustment tab........................................................................... 54
Figure 25 Temperature adjustment view in Insight..................................................56
Figure 26 Replacing filter.................................................................................................58
Figure 27 Flow-through adapter dimensions with MGP260 probe.....................66
Figure 28 Flow-through adapter mounting plate dimensions..............................66
Figure 29 MGP260 dimensions in millimeters and inches......................................67
Figure 30 Removing parts for recycling...................................................................... 69
Figure 31 Probe body and component board: dispose as electrical
and electronic waste......................................................................................69
MGP260 User Guide M212504EN-A
4
List of tables
Table 1 Document versions (English)............................................................................7
Table 2 Related manuals................................................................................................... 7
Table 3 MGP260 measurement parameters.............................................................. 10
Table 4 MGP260 series hazardous area classifications...........................................16
Table 5 Screw terminal wiring requirements..............................................................18
Table 6 Intrinsic safe IIB output parameters.............................................................. 18
Table 7 Default Modbus serial communication settings........................................ 38
Table 8 Measurement performance.............................................................................63
Table 9 Inputs and outputs............................................................................................ 64
Table 10 Compliance..........................................................................................................64
Table 11 Operating environment....................................................................................65
Table 12 Mechanical specification..................................................................................65
Table 13 Options and accessories.................................................................................. 65
Table 14 Modbus measurement data registers (read-only)....................................70
Table 15 Modbus configuration data registers (writable)........................................72
Table 16 Modbus status data registers (read-only)...................................................82
Table 17 Error codes in register 0200
hex
(status code low)................................... 83
Table 18 Error codes in register 0202
hex
(status code high).................................. 84
Table 19 Device identification objects.......................................................................... 85
List of tables
5
MGP260 User Guide M212504EN-A
6
1. About this document
1.1 Version information
Table 1 Document versions (English)
Document code Date Description
M212504EN-A October 2020 This manual. First version of the document.
1.2 Related manuals
Table 2 Related manuals
Document code Description
M212481EN MGP260 Series Multilingual Installation and Safety Guide
(languages: English, German, French, Dutch, Spanish, Portuguese,
Italian, Hungarian, Czech, Polish, Finnish, Estonian, Swedish,
Norwegian, Danish)
M212500EN MGP260 Series Multilingual Installation and Safety Guide
(languages: English, Japanese, Chinese)
M212538EN MGP260 Series USB Service Cable 257295 Quick Guide
M212539EN MGP260 Series Flow-through adapter 258877 Quick Guide
M212540EN China ROHS disclosure report
1.3 Documentation conventions
Warning alerts you to a serious hazard. If you do not read and
follow instructions carefully at this point, there is a risk of injury or even death.
WARNING!
Caution warns you of a potential hazard. If you do not read and
follow instructions carefully at this point, the product could be damaged or
important data could be lost.
CAUTION!
Chapter 1 – About this document
7
Note highlights important information on using the product.
1.4 Trademarks
Vaisalaâ and CARBOCAPâ are registered trademarks of Vaisala Oyj.
All other product or company names that may be mentioned in this publication are trade
names, trademarks, or registered trademarks of their respective owners.
MGP260 User Guide M212504EN-A
8
2. Product overview
2.1 Introduction to MGP260 series
Vaisala CARBOCAPâ MGP260 Series Multigas Probes for Methane, Carbon Dioxide, and
Humidity Measurement are compact and durable in situ probes for methane (CH
4
), carbon
dioxide (CO
2
), and humidity (H
2
O vapor) measurements in demanding biogas processing
conditions. MGP260 series probes are Ex certified for use in Ex Zone 0 (parts inserted into
process) and Ex Zone 1 (parts outside the process).
MGP260 probes can be installed directly into raw process gas, removing the need for sample
treatment. Application areas include anaerobic digestion of industrial and municipal waste and
sludge from waste water treatment, landfill gas monitoring, activated carbon filter monitoring
in biogas treatment process, and CHP engine feed gas monitoring.
The MGP260 series proprietary infrared technology provides superior stability and
repeatability. Thanks to condensation elimination through probe heating and corrosion-
resistant steel and plastic materials, the IP66-rated instruments are highly robust and durable.
MGP260 series measurement output options include 3 analog current output channels (4 … 20
mA) and Modbus RTU over RS-485. The probes also provide a 4 … 20 mA Ex ia input for
connecting an optional external pressure or temperature sensor.
For easy-to-use access to configuration, diagnostics, and calibration and adjustment
functionalities, MGP260 probes can be connected to Vaisala Insight PC software with a USB
cable accessory.
2.2
Basic features and options
• Available measurement parameters: methane (CH
4
), carbon dioxide (CO
2
), and humidity
(H
2
O vapor)
• Ex classification: IECEx and MET certified for use in Class I Division 2 and Zone 0/1
environments: for full Ex classifications, see Table 4 (page 16).
• Operating pressure: -500 ... +500 mbar
• 3 analog outputs (4 … 20 mA, scalable, isolated)
• Digital output: Modbus RTU over RS-485
• Optional external temperature or pressure sensor input (4 … 20 mA, Ex ia)
• Power supply input: 18 … 30 VDC
• Direct installation into process: for pipeline ports with 1.5" female NPT thread
• Compatible with Vaisala Insight PC software
2.2.1 Hazardous area safety
Do not install or use MGP260 in a hazardous area before reviewing
the safety information in Using MGP260 series probes in hazardous locations
(page 16).
CAUTION!
Chapter 2 – Product overview
9
2.2.2 Measurement parameters
Table 3 (page 10) shows the units and ranges of the MGP260 measurement parameters. For
further information on the measurement parameters, see Specifications (page 63).
Table 3 MGP260 measurement parameters
Parameter Unit Measurement range
Methane (CH
4
) Volume-% 0 … 100 vol-%
Carbon dioxide (CO
2
) Volume-% 0 … 100 vol-%
Water vapor (H
2
O) • Volume-%
• Dew point temperature
• Dew point and frost point
temperature
• 0 … 25 vol-%
• -10 … +60 °C (14 … +140 °F)
2.2.3 Wet basis and dry basis measurement output
MGP260 methane, carbon dioxide, and water vapor measurements can be shown either as wet
basis or dry basis values. The wet basis / dry basis measurement output selection is made
when ordering the probe, and can be configured with Vaisala Insight PC software or Modbus.
Figure 1 Output parameter selections in Vaisala Insight PC software
MGP260 User Guide M212504EN-A
10
More information
‣
Configuring analog outputs with Insight (page 40)
2.2.4 Connectivity to Vaisala Insight software
The probe can be connected to Vaisala Insight software using a Vaisala USB cable (order code:
257295). With the Insight software, you can:
• Calibrate and adjust the measurement.
• See device information and status.
• See real-time measurement.
• Configure serial communication settings, analog input and output parameters and scaling,
and environmental compensations.
More information
‣
Connecting to Insight software (page 35)
Chapter 2 – Product overview
11
2.3 Probe parts
Figure 2 (page 12) shows the MGP260 main components with the connection box of the
probe closed and opened.
1 2 3
4
5
6
8
9
10
11
7
Figure 2 MGP260 probe parts (closed and opened view)
1
Grounding terminal: use a ≥ 4 mm
2
wire to connect to the grounding rail
2 Breather plug and lead-throughs for wiring: install cable glands as required and seal
unused lead-throughs (see Lead-through options and breather plug (page 13))
3 Tightening flange of the connection box with captive Allen screws. Loosen the captive
screws with a 5 mm (3/16 in) Allen key and open the connection box to access wiring
terminals.
4 Tightening nut: only tighten from the tightening nut when installing (wrench size: 50 mm
(1.97 in))
5 1.5" male NPT thread: never install to any other thread type than 1.5" female NPT thread
6 Probe filter (user-replaceable)
7 1.5" NPT thread test plug
8 Wiring terminals for optional 4 … 20 mA input from external pressure or temperature
sensor (Ex ia)
9 Barrier separating the intrinsically safe (Ex ia) optional external sensor input terminals
from the analog output, power supply input, and RS-485 terminals
10 Wiring terminals for 4 … 20 mA analog outputs, 18 … 30 VDC power supply input, and
RS-485 communication
11 Measurement cuvette with optics and CARBOCAPâ sensor inside the probe filter
MGP260 User Guide M212504EN-A
12
2.3.1 Lead-through options and breather plug
Figure 3 (page 13) shows the MGP260 lead-through options and breather plug location.
Cable glands are not provided by Vaisala. When selecting cable glands for your
application, note the requirements in Guidelines for safe use in hazardous
conditions (page 17).
1
3
2
4
Figure 3 Lead-through options and breather plug
1 Breather plug: do not adjust.
2 M16x1.5 wiring lead-through: used when wiring the optional Ex ia external pressure or
temperature sensor input terminal.
3 M20x1.5 wiring lead-through with removable plastic transport cover (fold sides of
transport cover together and pull out). Wiring option for analog output, power supply
input, and RS-485 terminals, or customer-specific additional wiring.
4 M20x1.5 wiring lead-through for analog output, power supply input, and RS-485 terminals.
Seal unused lead-throughs. Use only Ex compliant seals on the
MGP260 lead-throughs.
CAUTION!
More information
‣
Preparing probe for installation (page 26)
‣
Wiring (page 28)
Chapter 2 – Product overview
13
2.4 Measurement principle
1
2
3
The Vaisala CARBOCAPâ sensor used in
the probe is a silicon-based, nondispersive
infrared (NDIR) sensor for the
measurement of methane (CH
4
), carbon
dioxide (CO
2
), and humidity (H
2
O).
Figure 4 Probe cuvette with mirror and
sensor chips
1 Mirror
2 Cuvette
3 Sensor chips under TO5 packages
The sensitivity to gases is based on absorption of infrared light at a characteristic wavelength.
During measurement, infrared light is routed through the cuvette that contains the gas to be
measured. A mirror reflects the light from the cuvette to thermopile detectors that measure
the light intensity at a wavelength determined by a Fabry–Pérot interferometer (FPI) and a
band pass filter. One set of optics measures humidity and carbon dioxide, and a second one
measures methane.
The measurement consists of two steps: first, the FPI is electrically tuned so that its pass band
coincides with the characteristic absorption wavelength of the measured gas and the signal is
recorded. Second, the pass band is shifted to a wavelength where no absorption occurs in
order to get a reference signal. The ratio of these two signals, one at the absorption
wavelength and the other at the reference wavelength, gives the fraction of light absorption
from which the gas concentration is calculated. Measuring the reference signal compensates
the possible eects of sensor aging and signal attenuation due to dirt on optical surfaces,
making the sensor very stable over time.
MGP260 User Guide M212504EN-A
14
TO5 packages with hermetic windows are used to protect the sensor chips from moisture and
contamination.
1
3
4
5
6
7
8
2
Figure 5 Measurement in the measurement
cuvette
1 Mirror
2 Light absorbed by the measured gases
3 Sensor chips under TO5 packages (see
items 4 … 8)
4 Hermetic window
5 Thermopile detector
6 Hermetic window
7 Fabry–Pérot interferometer
8 Light source (Microglow)
More information
‣
Specifications (page 63)
Chapter 2 – Product overview
15
2.5 Using MGP260 series probes in hazardous
locations
MGP260 series probes have been designed for use in hazardous
locations as specified by the product classification. The personnel installing,
using, or maintaining MGP260 probes are responsible for determining the
appropriate protection concept for the specific application the probe is used
in, and that the hazardous area classification of the probe meets the
requirements of the application.
WARNING!
If the equipment is used in a manner not specified by Vaisala, the
protection provided by the equipment may be impaired.
WARNING!
MGP260 probes are certified for use in hazardous areas as defined by the following
classifications:
Table 4 MGP260 series hazardous area classifications
Certification MGP260 classification
IECEx (international)
ATEX (EU)
Ex II 1/2 (1) G Ex eb mb [ia] IIB T3 Ga/Gb -40 °C ≤ Tamb ≤ +60 °C
MET (US/CAN) NEC 500: Class I, Division 2, Groups C & D; T3
NEC 505: Class I, Zone 0, AEx eb mb [ia] IIB T3 Ga/Gb
CSA 60079: Ex eb mb [ia] IIB T3 Ga/Gb
The personnel installing, operating, and maintaining MGP260
probes must have the required competencies for working in the hazardous
location, as defined by the applicable standards.
CAUTION!
For information on the standards that apply to using MGP260 probes based on the
classification of the device, see MGP260 certification documentation and the declarations of
conformity related to MGP260 probes at www.vaisala.com/declarationofconformity.
MGP260 User Guide M212504EN-A
16
2.5.1 Guidelines for safe use in hazardous conditions
Process connection and partition wall
Gb Ga
1
2
Figure 6 MGP260 Ga/Gb division
1 The part outside of the process (up until to the NPT 1.5" connection thread) complies with
the Gb E
quipment Protection Level (EPL).
2 The part inside the process (starting from the NPT 1.5" thread) complies with the Ga EPL.
The partition wall is made of stainless steel, sapphire glass, and silicone adhesive. The
stress limit temperature range of the silicone adhesive is -40 … +60 °C (-40 ... +140 °F).
While installing or uninstalling the device, there is a risk of
flammable gas r
elease or flame entrance.
WARNING!
Wiring requirements
• The wiring of the optional intrinsically safe (Ex ia) external pressure or temperature sensor
input terminal must be kept separate from the analog output, power supply input, and
RS-485 wiring.
• See the wiring instructions in the installation section.
• The cable glands and cables used for wiring the device must not impair the Ex protection.
• US/CAN: The cables used for wiring must have a flammability rating of UL 2556 VW-1
or equivalent.
• Unused lead-throughs must be sealed using Ex compliant plugs.
• See Table 5 (page 18) for screw terminal requirements.
• Use an 18 … 30 VDC power supply with the probe.
• Permitted supply short-circuit current (I
k
): 50 A.
• US/CAN: only use a UL listed 18 … 30 VDC (min. 6 W) power supply. The power supply
must be UL/CSA 60950-1 certified.
• MGP260 analog outputs must be externally powered.
Chapter 2 – Product overview
17
Connect only de-energized wires. Never switch on the power supply
input before completing the wiring and closing the connection box.
CAUTION!
Table 5 Screw terminal wiring requirements
Property Specification
Connection torque 0.5 Nm ... 0.6 Nm
Wire cross section / connection capacity (solid
and flexible)
0.2 mm
2
... 2.5 mm
2
(AWG 24 ... 12)
Stripping length 7 mm (0.27 in)
Intrinsic safety
The overvoltage category of MGP260 series probes is I (non-mains equipment), as defined in
IEC 60664-1.
MGP260 probes are in conformance with the IEC 60079-11 dielectric strength requirement. For
the intrinsic safe IIB output parameters, see Table 6 (page 18).
Table 6 Intrinsic safe IIB output parameters
Parameter Value
U
o
25.2 V
I
o
78 mA
P
o
0.5 W
U
m
40 V
C
o
820 nF
L
o
20 mH
The parameters listed in Table 6 (page 18) apply when one of the two conditions below is
given:
• the total L
i
of the external circuit (excluding the cable) is < 1% of the L
o
value; or
• the total C
i
of the external circuit (excluding the cable) is < 1% of the C
o
value.
The parameters are reduced to 50% when both of the two conditions below are given:
• the total L
i
of the external circuit (excluding the cable) is ≥1% of the L
o
value; and
• the total C
i
of the external circuit (excluding the cable) is ≥1% of the C
o
value.
Note: the reduced capacitance of the external circuit (including cable) shall not be greater
than 1μF for Groups I, IIA, IIB & IIIC, and 600nF for Group IIC.
MGP260 User Guide M212504EN-A
18
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