Vaisala MGP261 User Manual

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M212273EN-A

User Guide

MGP261 Multigas Probe for Methane, Carbon

Dioxide, and Humidity Measurement

MGP261

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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.

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.

This product contains software developed by Vaisala or third parties. Use of the software is governed by license terms and conditions included in the applicable supply contract or, in the absence of separate license terms and conditions, by the General License Conditions of Vaisala Group.

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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 MGP261....................................................................................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 Installation Type........................................................................................ 11

2.2.5 Process Flow Range and Installation Type.............................................11

2.2.6 Connectivity to Vaisala Insight Software................................................11

2.3 Probe Parts.......................................................................................................13

2.3.1 Cable Gland Options and Lead-Throughs.............................................14

2.4 Measurement Principle...................................................................................15

2.5 Using MGP261 in Hazardous Locations.........................................................17

2.5.1 Guidelines for Safe Use in Hazardous Conditions................................ 17

3. Installation.......................................................................................................20

3.1 Overview......................................................................................................... 20

3.1.1 Process Flow Range and Installation Type.......................................... 20

3.1.2 NPT 1.5" Thread Test Plug 257525SP......................................................21

3.1.3 Installation Preparations..........................................................................21

3.1.4 Installation Option: Ball Valve Installation............................................22

3.1.5 Installation Option: Flow-Through Adapter Installation.....................23

3.1.6 MGP261 Dimensions................................................................................24

3.1.7 Recommended Installation Position on Pipeline.................................24

3.1.8 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....................................................................................... 29

3.5 Finalizing Installation.....................................................................................30

3.6 Attaching Flow-Through Adapter to MGP261.............................................. 31

3.7 Installation Type Conﬁguration in Insight....................................................33

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

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MGP261 User Guide M212273EN-A

5. Modbus............................................................................................................. 38

5.1 Conﬁguring Modbus Communication Settings with Insight.....................39

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 Overview..................................................................................... 49

8.1.1 Compensation Mode During Calibration..............................................50

8.1.2 Flow-Through Adapter...........................................................................50

8.2 Calibration and Adjustment with Insight PC Software.............................. 52

8.2.1 Example: 2-Point Adjustment with Zero Point Adjustment...............53

8.2.2 Zero Point Adjustment........................................................................... 53

8.2.3 Calibrating and Adjusting Methane (CH4) Measurement...................54

8.2.4 Calibrating and Adjusting Carbon Dioxide (CO2) Measurement.......55

8.2.5 Calibrating and Adjusting Temperature Measurement...................... 56

9. Maintenance....................................................................................................58

9.1 Filter Change...................................................................................................58

9.2 Removing Probe from Process..................................................................... 59

9.3 Cleaning the Probe........................................................................................ 60

9.4 Sending Probe to Vaisala................................................................................61

10. Technical Data................................................................................................62

10.1 Speciﬁcations.................................................................................................. 62

10.2 Wetted Parts Material Information...............................................................65

10.3 MGP261 Dimensions.......................................................................................66

10.4 Flow-Through Adapter Dimensions............................................................. 67

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Table of Contents

Appendix A: ....................................................................................................68

A.1 Modbus Registers...........................................................................................68

A.1.1 Measurement Data.................................................................................. 68

A.1.2 Conﬁguration Registers..........................................................................70

A.1.3 Status Registers......................................................................................80

A.1.4 Device Identiﬁcation Objects.................................................................83

Warranty............................................................................................................85

Technical Support............................................................................................85

Recycling...........................................................................................................85

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MGP261 User Guide M212273EN-A

List of Figures

Figure 1 Output Parameter Selections in Vaisala Insight PC Software.............10

Figure 2 MGP261 Probe Parts (Closed and Opened View)....................................13

Figure 3 Cable Gland Options and Lead-Throughs ................................................14

Figure 4 Probe Cuvette with Mirror and Sensor Chips...........................................15

Figure 5 Measurement in the Measurement Cuvette..............................................16

Figure 6 MGP261 Probe Ga/Gb Division.....................................................................17

Figure 7 NPT 1.5" Thread Test Plug..............................................................................21

Figure 8 MGP261 Installation Example with Wiring Routes and

Recommended Orientation and Depth.....................................................22

Figure 9 MGP261 in Flow-Through Adapter 258877.............................................. 23

Figure 10 MGP261 Dimensions in Millimeters and Inches.......................................24

Figure 11 Recommended MGP261 Installation Position on Pipeline................... 24

Figure 12 MGP261 Screw Terminal Markings and Cable Routes........................... 28

Figure 13 MGP261 Wiring Diagram...............................................................................29

Figure 14 Installation Type Selection in Insight.........................................................33

Figure 15 Connecting Probe to Insight........................................................................35

Figure 16 Insight Main Menu and Settings.................................................................. 37

Figure 17 Modbus Communication Settings in Insight PC Software...................39

Figure 18 Analog Output Conﬁguration Options in Insight.................................. 40

Figure 19 Unit Selection in Insight................................................................................. 41

Figure 20 Output Parameter Selections in Vaisala Insight PC Software............ 42

Figure 21 Measurement Menu View in Insight PC Software ................................. 45

Figure 22 Analog Input 1 Conﬁguration Menu in Insight.........................................47

Figure 23 Flow-Through Adapter 258877...................................................................50

Figure 24 Calibration Menu View in Insight PC Software........................................52

Figure 25 Zero Point Adjustment Tab.......................................................................... 54

Figure 26 Temperature Adjustment View in Insight.................................................56

Figure 27 Replacing Filter................................................................................................58

Figure 28 MGP261 Dimensions in Millimeters and Inches.......................................66

Figure 29 Flow-Through Adapter Dimensions with MGP261 Probe.....................67

Figure 30 Flow-Through Adapter Mounting Plate Dimensions.............................67

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List of Tables

Table 1 Document versions.............................................................................................. 7

Table 2 Related Manuals....................................................................................................7

Table 3 MGP261 Measurement Parameters................................................................10

Table 4 Screw Terminal Wiring Requirements...........................................................18

Table 5 Intrinsic Safe IIB Output Parameters.............................................................18

Table 6 Default Modbus Serial Communication Settings...................................... 38

Table 7 Measurement Performance.............................................................................62

Table 8 Operating Environment....................................................................................63

Table 9 Compliance..........................................................................................................63

Table 10 Inputs and Outputs............................................................................................63

Table 11 Mechanical Speciﬁcation................................................................................. 64

Table 12 Options and Accessories................................................................................. 64

Table 13 Modbus Measurement Data Registers (Read-Only)................................68

Table 14 Modbus Conﬁguration Data Registers (Writable)....................................70

Table 15 Modbus Status Data Registers (Read-Only)..............................................80

Table 16 Error Codes in Register 0200 Table 17 Error Codes in Register 0202

Table 18 Device Identiﬁcation Objects..........................................................................83

(Status Code Low)................................81

hex

(Status Code High)...............................82

hex

List of Tables

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MGP261 User Guide M212273EN-A

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Chapter 1 – About This Document

1. About This Document

1.1 Version Information

Table 1 Document versions

Document Code Date Description

M212273EN-A August 2019 This manual. First version of the document.

1.2 Related Manuals

Table 2 Related Manuals

Document Code Description

M212238EN MGP261 Multilingual Installation and Safety Guide (languages:

M212291EN USB Service Cable 257295 Quick Guide

M212283EN Flow-Through Adapter 258877 Quick Guide

English, German, French, Dutch, Spanish, Portuguese, Italian, Hungarian, Czech, Polish, Finnish, Estonian, Swedish, Norwegian, Danish)

1.3 Documentation Conventions

WARNING!

follow instructions carefully at this point, there is a risk of injury or even death.

CAUTION!

follow instructions carefully at this point, the product could be damaged or important data could be lost.

Note highlights important information on using the product.

Warning alerts you to a serious hazard. If you do not read and

Caution warns you of a potential hazard. If you do not read and

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MGP261 User Guide M212273EN-A

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.

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Chapter 2 – Product Overview

2. Product Overview

2.1 Introduction to MGP261

Vaisala CARBOCAPâ MGP261 Multigas Probe for Methane, Carbon Dioxide, and Humidity Measurement is a compact and durable in situ probe for methane (CH4), carbon dioxide (CO2),

and moisture (H2O vapor) measurements in demanding biogas processing conditions. MGP261 probes are Ex certiﬁed for use in Ex Zone 0 (parts inserted into process) and Ex Zone 1 (parts

outside the process).

MGP261 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 proprietary infrared technology of MGP261 provides superior stability and repeatability. Thanks to condensation elimination through probe heating and corrosion-resistant steel and plastic materials, the IP66-rated instrument is highly robust and durable.

MGP261 measurement output options include 3 analog current output channels (4 … 20 mA) and Modbus RTU over RS-485. The probe also provides 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, MGP261 can be connected to Vaisala Insight PC software with a USB cable accessory.

2.2

Basic Features and Options

• Available measurement parameters: methane (CH4), carbon dioxide (CO2), and moisture (H2O vapor)

• Ex classiﬁcation: Ex II 1/2 (1) G Ex eb mb [ia] IIB T3 Ga/Gb -40 °C ≤ Tamb ≤ +60 °C

• 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

CAUTION!

the safety information in Using MGP261 in Hazardous Locations (page 17).

Do not install or use MGP261 in a hazardous area before reviewing

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MGP261 User Guide M212273EN-A

2.2.2 Measurement Parameters

Table 3 (page 10) shows the units and ranges of the MGP261 measurement parameters. For

further information on the measurement parameters, see Speciﬁcations (page 62).

Table 3 MGP261 Measurement Parameters

Parameter Unit Measurement Range

Methane (CH4) Volume-% 0 … 100 vol-%

Carbon Dioxide (CO2) Volume-% 0 … 100 vol-%

Water Vapor (H2O) • Volume-%

• Dew point temperature

• Dew point and frost point temperature

• 0 … 100 vol-%

• -10 … +60 °C (14 … +140 °F)

2.2.3 Wet Basis and Dry Basis Measurement Output

MGP261 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

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Chapter 2 – Product Overview

More Information

‣

Conﬁguring Analog Outputs with Insight (page 40)

2.2.4 Installation Type

MGP261 can be installed either directly into the process (for example, through a ﬂange or ball valve in the actual process pipeline), or using a ﬂow-through adapter (for example, in a sampling line installation or when performing a ﬁeld calibration).

MGP261 uses dierent internal calculation models depending on the installation type and gas ﬂow rate. For this reason, the type of the installation must be set correctly in MGP261 settings. You can view and change the installation type conﬁguration with Vaisala Insight PC software: for instructions, see Installation Type Conﬁguration in Insight (page 33).

CAUTION!

correctly in Insight when changing from one installation type to another, so that the calculation model in use matches the installation environment and measurement accuracy is not aected.

Always ensure that the installation type conﬁguration is set

2.2.5 Process Flow Range and Installation Type

A process ﬂow range of 2 ... 20 m/s is suitable for the in situ installation calculation model. When operating the probe in a low ﬂow environment (0 … 2 m/s) or using the ﬂow-through adapter, use the ﬂow-through calculation model. To set the correct calculation model for the ﬂow range, choose the installation type in the Vaisala Insight PC software.

Process Flow Range

2 ... 20 m/s Directly in process

0 … 2 m/s or with ﬂow-through adapter Flow-through adapter

More Information

‣

Installation Option: Ball Valve Installation (page 22)

‣

Installation Option: Flow-Through Adapter Installation (page 23)

‣

Installation Type Conﬁguration in Insight (page 33)

‣

Connecting to Insight Software (page 35)

‣

Speciﬁcations (page 62)

Installation Type Selection in Insight PC Software

2.2.6 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.

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MGP261 User Guide M212273EN-A

• 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)

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2 3 4

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Chapter 2 – Product Overview

2.3 Probe Parts

Figure 2 (page 13) shows the MGP261 main components with the connection box of the probe

closed and opened.

Figure 2 MGP261 Probe Parts (Closed and Opened View)

1 2 Grounding terminal 3 Lead-throughs for wiring: install cable glands as required (see Cable Gland Options and

4 Connection box cover: open with connection box key to access wiring terminals 5 Tightening nut: only tighten from the tightening nut when installing 6 1.5" male NPT thread: never install the probe to any other thread type than 1.5" female

7 Probe ﬁlter 8 1.5" NPT thread test plug 9 Wiring terminals for optional 4 … 20 mA input from external pressure or temperature

10 Barrier separating the intrinsically safe (Ex ia) optional external sensor input terminals

11 Wiring terminals for 4 … 20 mA analog outputs, 18 … 30 VDC power supply input, and

12 Measurement cuvette with optics and CARBOCAPâ sensor inside the probe ﬁlter

Connection box key

Lead-Throughs (page 14)) and seal unused lead-throughs

NPT thread

sensor (Ex ia)

from the analog output, power supply input, and RS-485 terminals

RS-485 communication

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M16x1.5

M20x1.5

E - E

6 [0.24]

mm [in]

MGP261 User Guide M212273EN-A

2.3.1 Cable Gland Options and Lead-Throughs

Figure 3 (page 14) shows the MGP261 cable gland options and lead-through measurements.

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).

Figure 3 Cable Gland Options and Lead-Throughs

M16x1.5 wiring lead-through (1): used when wiring the optional Ex ia external pressure or

temperature sensor input terminal

2 M20x1.5 wiring lead-throughs (2): used when wiring the analog output, power supply

input, and RS-485 terminals

3 The depth of the lead-throughs is 6 mm (0.24 in): the maximum thread length for the

plugs used in the lead-throughs is 8 mm (0.31 in) and the maximum cable gland length is 5 cm (1.97 in)

More Information

‣

Preparing Probe for Installation (page 26)

‣

Wiring (page 28)

Page 17

2.4 Measurement Principle

Chapter 2 – Product Overview

The Vaisala CARBOCAPâ sensor used in the probe is a silicon-based, nondispersive infrared (NDIR) sensor for the measurement of methane (CH4), carbon

dioxide (CO2), and humidity (H2O).

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 eects of sensor aging and signal attenuation due to dirt on optical surfaces, making the sensor very stable over time.

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MGP261 User Guide M212273EN-A

TO5 packages with hermetic windows are used to protect the sensor chips from moisture and contamination. A heater chip is utilized to prevent condensation in normal operation.

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 62)

Page 19

Ex II 1/2 (1) G Ex eb mb [ia] IIB T3 Ga/Gb -40 °C ≤ Tamb ≤ +60 °C

1 2

Chapter 2 – Product Overview

2.5 Using MGP261 in Hazardous Locations

WARNING!

speciﬁed by the product classiﬁcation. The personnel installing, using, or maintaining the probe 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.

MGP261 is certiﬁed for use in hazardous areas as deﬁned by the following classiﬁcation:

CAUTION!

have the required competencies for working in the hazardous location, as deﬁned by the applicable standards.

For information on the standards that apply to using MGP261 based on the classiﬁcation of the device, see MGP261 certiﬁcation documentation and the declarations of conformity related to MGP261 at www.vaisala.com/declarationofconformity.

MGP261 has been designed for use in hazardous locations as

The personnel installing, operating, and maintaining MGP261 must

2.5.1 Guidelines for Safe Use in Hazardous Conditions

Process Connection and Partition Wall

Figure 6 MGP261 Probe Ga/Gb Division

The part outside of the process (up until to the NPT 1.5" connection thread) complies with

the Gb Equipment 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).

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MGP261 User Guide M212273EN-A

WARNING!

ﬂammable gas release or

While installing or uninstalling the device, there is a risk of

ﬂame entrance.

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 input, power supply input, and RS-485 wiring.

• See the overview in the installation instructions.

• The cable glands and wires used for wiring MGP261 must be Ex compliant.

• Unused lead-throughs must be sealed using Ex compliant plugs.

• Select a strain relief option that suits the application (either use cable glands that include strain relief or install separate clamps: see IEC 60079-14).

• See Table 4 (page 18) for screw terminal requirements.

• Permitted supply short-circuit current (Ik): 50 A

• MGP261 analog outputs must be externally powered.

CAUTION!

input befor

Connect only de-energized wires. Never switch on the power supply

e completing the wiring and closing the connection box.

Screw Terminal Connections

Table 4 Screw Terminal Wiring Requirements

Property Speciﬁcation

Connection torque 0.5 Nm ... 0.6 Nm

Connection capacity (solid and ﬂexible

Stripping length 7 mm (0.27 in)

)

0.2 mm2 ... 2.5 mm2 (AWG 24 ... 12)

Intrinsic Safety

vervoltage category of MGP261 is I (non-mains equipment), as deﬁned in IEC 60664-1.

The o

MGP261 is in conformance with the IEC 60079-11 dielectric strength requirement. For the intrinsic safe IIB output parameters, see Table 5 (page 18).

Table 5 Intrinsic Safe IIB Output Parameters

Parameter Value

25.2 V

78 mA

Page 21

Chapter 2 – Product Overview

Parameter Value

0.5 W

40 V

820 nF

20 mH

The parameters listed in Table 5 (page 18) apply when one of the two conditions below is given:

• the total Li of the external circuit (excluding the cable) is < 1% of the Lo value; or

• the total Ci of the external circuit (excluding the cable) is < 1% of the Co value.

The parameters are reduced to 50% when both of the two conditions below are given:

• the total Li of the external circuit (excluding the cable) is ≥1% of the Lo value; and

• the total Ci of the external circuit (excluding the cable) is ≥1% of the Co 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.

The values of Lo and Co determined by this method shall not be exceeded by the sum of all of the Li plus cable inductances in the circuit and the sum of all of Ci plus cable capacitances, respectively.

Connecting Probe to Insight PC Software

The Insight PC software connection cable must only be used outside the explosion hazardous area. Remove the probe from the process for conﬁguration, and use only the Vaisala accessory PC connection cable to connect the probe to Insight.

Maintenance

The probe ﬁlter is the only user-replaceable part in MGP261. For other maintenance requirements, contact Vaisala.

Live maintenance is not allowed.CAUTION!

The content in this chapter is maintained in the following separately tracked document:

Document ID: M212241EN Revision: B (21 Jan 2019)

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MGP261 User Guide M212273EN-A

3. Installation

3.1 Overview

For an overview of installing MGP261 directly in the process, see Installation Option: Ball Valve

Installation (page 22)

For an overview of the ﬂow-through adapter, see Installation Option: Flow-Through Adapter

Installation (page 23)

CAUTION!

correctly in Insight when changing from one installation type to another, so that the calculation model in use matches the installation environment and measurement accuracy is not aected.

Always ensure that the installation type conﬁguration is set

3.1.1 Process Flow Range and Installation Type

Process Flow Range

2 ... 20 m/s Directly in process

0 … 2 m/s or with ﬂow-through adapter Flow-through adapter

More Information

‣

Installation Option: Ball Valve Installation (page 22)

‣

Installation Option: Flow-Through Adapter Installation (page 23)

‣

Installation Type Conﬁguration in Insight (page 33)

‣

Connecting to Insight Software (page 35)

‣

Speciﬁcations (page 62)

Installation Type Selection in Insight PC Software

Page 23

Chapter 3 – Installation

3.1.2 NPT 1.5" Thread Test Plug 257525SP

Figure 7 NPT 1.5" Thread Test Plug

1 NPT 1.5" male thread (same as on MGP261 connector)

MGP261 comes shipped with an NPT 1.5" male thread test plug (Vaisala order code: 257525SP). If you are uncertain about the thread type of the process connector you want to install MGP261 into, use the thread test plug to check that it ﬁts into the process connector threads (that is, that the process connector thread type is NPT 1.5" female).

More Information

‣

Inserting Probe into Process and Opening Connection Box (page 27)

3.1.3 Installation Preparations

Before starting the installation, check the following:

• Make sure that your installation site suits the Ex classiﬁcation of MGP261:

Ex II 1/2 (1) G Ex eb mb [ia] IIB T3 Ga/Gb -40 °C ≤ Tamb ≤ +60 °C

• Review the hazardous area information in Using MGP261 in Hazardous Locations (page 17) and make sure that the conditions for safe use are met.

• Review the wiring diagram included in this document for power supply requirements: MGP261 requires a dedicated 24 VDC power supply. Note that in addition to the power supply input for the probe, each analog output must be externally powered.

• Inspect the probe for any possible damage or dirt that could compromise the leak tightness of the device (for example, bent or punctured parts of the probe body, or dirt on the connection box threads preventing it from closing fully).

• When selecting the cable glands and plugs for your application, make sure they are Ex compliant.

More Information

‣

Using MGP261 in Hazardous Locations (page 17)

‣

Wiring (page 28)

Page 24

3 5

MGP261 User Guide M212273EN-A

3.1.4 Installation Option: Ball Valve Installation

The following figure shows an example MGP261 ball valve installation. The ﬁgure the correct wiring routes and shows the recommended installation depth and orientation.

highlights

CAUTION!

essure or temperature sensor input wiring (1), and make sure the wiring

pr remains separated from the terminals and wiring (2) on the other side of the metal barrier (3) on the component board.

Figure 8 MGP261 Installation Example with Wiring Routes and Recommended Orientation and Depth

1 Optional external pressure or temperature sensor input wiring (Ex ia): use the M16x1.5

2 Standard analog output, power supply input, and RS-485 communication wiring: use the

3 Metal barrier separating the intrinsically safe external sensor input terminals (optional, for

4 1.5" male NPT thread on MGP261: never install to any other thread type than 1.5" female

5 For best results, install MGP261 horizontally and position the tip of the ﬁlter within 1/3 of

ough and route the cable directly to the terminal.

lead-thr

M20x1.5 lead-throughs and route the cables to the terminals through the openings below the component board.

environmental compensation input) from the analog output, power supply input, and RS-485 terminals on the component board.

NPT.

the pipe's diameter from the pipe centerline. In smaller pipes, the installation depth can be adjusted by using an adapter (for example, a ball valve).

Always use a separate cable for the optional (Ex ia) external

More Information

‣

ecommended Installation Position on Pipeline (page 24)

Page 25

Chapter 3 – Installation

3.1.5 Installation Option: Flow-Through Adapter Installation

Figure 9 (page 23) shows MGP261 attached into the MGP261 ﬂow-through adapter accessory

(Vaisala order code: 258877). For instructions on attaching MGP261 to the ﬂow-through adapter, see Attaching Flow-Through Adapter to MGP261 (page 31).

Figure 9 MGP261 in Flow-Through Adapter 258877

1 Clamp with 2 screws 2 Mounting plate (attach to mounting

surface with screws or ties)

3 Probe gland tightening nut 4 Probe gland locknut: do not turn 5 Gas tube inlet port, G 1/8 (on the other

side of the adapter)

6 Gas tube outlet port, G 1/8

More Information

‣

Attaching Flow-Through Adapter to MGP261 (page 31)

‣

Flow-Through Adapter Dimensions (page 67)

Page 26

Ø 32

[1.26]

Ø 80.5 [3.17]

1 .5” NPT

M16x1.5

M20x1.5

Ø 40 [1.57]

Ø 80.5 [3.17]

E - E

6 [0.24]

[0.56]

142 [5.59]

179 [7.05]

388 [15.27]

Ø 34 [1.34]

402 [15.83]

20 [0.79]

17 [0.67]

209 [8.23]

[1.85]

mm [in]

≥

5 ø

≥

2 ø

MGP261 User Guide M212273EN-A

3.1.6 MGP261 Dimensions

Figure 10 (page 24) shows the MGP261 dimensions. The ﬁgure also shows the cabling lead-

through depth: for more information on cable gland options and lead-through dimensions, see

Cable Gland Options and Lead-Throughs (page 14).

Figure 10 MGP261 Dimensions in Millimeters and Inches

3.1.7 Recommended Installation Position on Pipeline

Figure 11 (page 24) shows the recommended installation position for MGP261. Install the

probe in a straight run of pipeline, ≥ 5 pipe diameters downstream of the closest bend or other feature aecting gas ﬂow, and ≥ 2 pipe diameters upstream to the next bend or similar feature. For best results, use the orientation and installation depth shown in Figure 8 (page 22).

Figure 11 Recommended MGP261 Installation Position on Pipeline

Recommended MGP261 installation position on pipeline.

Page 27

3.1.8 Gas Safety During Installation

Chapter 3 – Installation

WARNING!

ﬂammable gas release or ﬂame entrance.

WARNING!

(H2S)) is possible when installing or removing MGP261 from the process.

• Always follow local safety guidelines. Ensure that the work area is safe and meets local regulations (for example, related to ventilation and personal protective equipment).

• Use a personal gas detector to monitor the safety of the area you are working in.

• After installation, use a gas detector to ensure that process connections are leak-free.

CAUTION!

• Ensure that the thread type of the installation port is 1.5" female NPT. If unsure, verify the thread type with the 1.5" NPT thread test plug.

• Apply PTFE tape to the 1.5" male NPT thread of MGP261 as instructed in

Preparing Probe for Installation (page 26), and make sure that the PTFE tape

seal has not been damaged by rotating the probe open (counter-clockwise) in the installation port.

While installing or uninstalling the device, there is a risk of

Exposure to hazardous gases (for example, hydrogen sulﬁde

To avoid compromising the leak tightness of the installation:

Page 28

M16x1.5 (1)

M20x1.5 (2)

PTFE

MGP261 User Guide M212273EN-A

3.2 Preparing Probe for Installation

The following tools are required when installing:

• Adjustable wrench (or a similar suitable tool) for turning the tightening nut

• Connection box key (provided)

• Input and output cables for wiring

• Small slotted screwdriver for screw terminals

• PTFE tape (wide) for the probe threads

1. Attach cable glands (not provided by Vaisala) to the wiring lead-throughs as required.

2. Apply PTFE tape on the probe threads.

Note the cable gland requirements listed in Guidelines for Safe Use in Hazardous

Conditions (page 17)). For more information on cable gland options and lead-through

dimensions, see Cable Gland Options and Lead-Throughs (page 14).

• Use an M16x1.5 gland for the optional external sensor input wiring (Ex ia).

• Use 1 or 2 M20x1.5 glands for wiring the 4 … 20 mA analog output, power supply input and RS-485 terminals (as required in your application).

• Seal unused lead-throughs.

• Inspect the threads and remove any possible dirt.

• Wrap 2-3 revolutions of tape in the direction of the thread spiral, starting from the ﬁrst thread. Keep the edge of tape parallel to the face of the thread while wrapping.

• Do not tape beyond the edge of the threads or leave loose tape hanging.

CAUTION!

female NPT. Installing into any other thread type can damage the equipment and compromise the leak tightness of the connection. If unsure, verify the thread type with the NPT 1.5" thread test plug.

The correct thread type in which to install MGP261 is 1.5"

Page 29

Chapter 3 – Installation

3.3 Inserting Probe into Process and Opening Connection Box

1. Insert the probe into the 1.5" female NPT installation port and rotate it clockwise until it sits ﬁrmly in the port. Do not tighten the probe to full tightness, only enough to keep it securely in place when wiring.

CAUTION!

installed into the port can tear the PTFE tape. Only adjust the position of the probe in the installation port by tightening (rotating clockwise).

2. Hold the probe by gripping the tightening nut with a wrench. Then open the connection box cover by turning the cover counter-clockwise with the connection box key.

For easier access, loosen the cable glands and insert the wiring cables into the connection box before pulling the connection box cover open.

3. Pull the connection box cover open to access the wiring terminals.

Rotating the probe open (counter-clockwise) after it has been

Page 30

3+ 3−

4 ... 20 mA Iout

Iout3

Iout2 Iout1

2−

1−

Vin +

Vin −

D +

D −

GND

RS-485

18 ... 30 VDC

RS-485

−

4 ... 20 mA

Ex ia Input

Iin

(P / T)

MGP261 User Guide M212273EN-A

3.4 Wiring

Figure 12 MGP261 Screw Terminal Markings and Cable Routes

2. See Finalizing Installation (page 30) for instructions on attaching grounding to the probe

CAUTION!

input before completing the wiring and closing the connection box.

1. Connect the input, output, and power supply wiring as required in your application. Figure

13 (page 29) shows an example of wiring the device when all inputs and outputs are

used.

• 1: Optional external pressure or temperature sensor input wiring (Ex ia): route the cable to the terminal through the M16x1.5 lead-through, above the component board.

• 2: Analog output, power supply input, and RS-485 wiring: route the cables to the terminals through the M20x1.5 lead-throughs (1 or 2), below the component board.

• Adjust cable length and attach strain relief (tighten cable glands or use clamps).

Connect only de-energized wires. Never switch on the power supply

CAUTION!

kept separate from the analog output, power supply, and RS-485 wiring (2). Always use separate cables on each side of the metal barrier.

The optional Ex ia external sensor input wiring (1) must be

grounding terminal.

Page 31

3.4.1 Wiring Diagram

ZONE 1

HAZARDOUS AREA

ZONE 0

−

Vin + Vin −

D + D −

3 − 3 +

2 − 2 +

1 − 1 +

P/T

−

CONTROLLER

SAFE AREA

MGP261

EXTERNAL SENSOR (PRESSURE OR TEMPERATURE)

GND

RS-485 + RS-485 − RSGND

4 ... 20 mA OUTPUTS

4 ... 20 mA

Ex ia INPUT

SHIELD

RS-485

Iout1 Iout2 Iout3

Iin

+ −

24 VDC

POWER SUPPLY FOR ANALOG OUTPUTS

−

24 VDC

POWER SUPPLY FOR PROBE

GROUNDING TERMINAL

GROUNDING RAIL

FOR POSSIBLE UNUSED WIRES; INTERNALLY CONNECTED WITH PROBE GROUNDING TERMINAL

EQUIPOTENTIAL

BONDING

Chapter 3 – Installation

Figure 13 MGP261 Wiring Diagram

Page 32

PULL INSTRUMENT OUT BEFORE CLOSING VALVE

≥ 4 mm2

MGP261 User Guide M212273EN-A

3.5 Finalizing Installation

1 Safety pin: in ball valve installations, lock the handle of the ball valve in the open position

with the safety pin to prevent damage caused by closing the valve with the instrument

inside.

2 MGP261 grounding terminal. 3

Use a ≥ 4 mm2 wire to connect the grounding terminal to the grounding rail of the

installation site.

1. Close and tighten the connection box (< 0.55 mm cover gap) and cable glands, and tighten the probe to ﬁnal tightness on the installation port by turning the tightening nut with the wrench.

2. Connect the MGP261 grounding terminal to the grounding rail of the installation site with a ≥ 4 mm2 wire.

3. Ball valve installations only: lock the handle of the ball valve in the open position with the safety pin.

4. When done, switch on the power supply input.

More Information

‣

Installation Type Conﬁguration in Insight (page 33)

Page 33

Chapter 3 – Installation

3.6 Attaching Flow-Through Adapter to MGP261

The MGP261 ﬂow-through adapter 258877 is delivered assembled and is intended to be used with the probe installed in an upright position. For an overview of the ﬂow-through adapter, see Installation Option: Flow-Through Adapter Installation (page 23).

To attach the adapter to MGP261:

1. Loosen the 2 screws on the clamp.

2. Loosen the probe gland.

CAUTION!

from the locknut of the probe gland (below the tightening nut). The threads of the locknut are glued onto the adapter with a sealant, and rotating the locknut will compromise the leak tightness of the adapter.

3. Insert the probe head into the adapter through the clamp and probe gland. Push the probe into the adapter until the shoulder of the probe head meets the slot inside the adapter and stops. The probe ﬁlter should cover both the inlet and outlet ports from the inside. Check the installation depth measurement as shown in Figure 29 (page 67).

4. Tighten the probe gland.

Only rotate the tightening nut of the probe gland. Never turn

Page 34

90°

MGP261 User Guide M212273EN-A

5. After tightening the probe gland, tighten the 2 screws on the clamp.

WARNING!

A high process pressure can cause the probe to detach from the adapter if the clamp and gland have been left loose. Always fully tighten the clamp and probe gland.

6. Attach the mounting plate to the mounting surface with screws or ties. For mounting plate dimensions, see Figure 30 (page 67).

7. Check that the probe sits closely in the clamps after mounting. The mounting kit and the ﬂow-through adapter have been aligned so that the probe sits in the adapter in a straight angle. A gap between the probe body and clamp indicates that the mounting alignment is incorrect and must be adjusted.

CAUTION!

Ensure the adapter mounting does not pull the probe out of a straight angle. If the mounting pulls the probe to the side, the leak tightness of the gland O-ring can be aected.

8. Connect the gas inlet tube to the upper port of the adapter and the gas outlet tube to the lower port. Adapter port size: G 1/8.

9. Connect to Vaisala Insight PC software and ensure that the installation type has been set as Flow-through adapter. For instructions, see Installation Type Conﬁguration in Insight

(page 33).

More Information

‣

Installation Type (page 11)

‣

Installation Option: Flow-Through Adapter Installation (page 23)

‣

Installation Type Conﬁguration in Insight (page 33)

‣

Flow-Through Adapter Dimensions (page 67)

Page 35

Chapter 3 – Installation

3.7 Installation Type Conﬁguration in Insight

Vaisala Insight PC software allows conﬁguring the installation type of MGP261. The available options are Directly in process and Flow-through adapter.

When the selected installation type is Flow-through adapter, the internal calculation model is adapted to the ﬂow-through environment. Always set the installation type according to the installation to ensure the correct calculation model is used.

Figure 14 Installation Type Selection in Insight

If you install your probe directly into the process, for example, through a ﬂange or ball valve in the actual pipeline, select Directly in process.

If you are using the probe with a ﬂow-through adapter, for example, in a sampling line installation, select Flow-through adapter.

To conﬁgure the installation type:

1. Connect to Insight (see Connecting to Insight Software (page 35)).

2. Select

3. Select the correct Installation type from the dropdown menu (either Directly in process or Flow-through adapter).

4. Store the selection with Save and exit with Close.

More Information

‣

Installation Type (page 11)

‣

Connecting to Insight Software (page 35)

> Conﬁgure Device > Measurement.

Page 36

MGP261 User Guide M212273EN-A

4. Operating with Insight Software

4.1 Vaisala Insight Software

Vaisala Insight software is a conﬁguration software for Indigo-compatible probes. The supported operating systems are Windows 7 (64-bit), Windows 8.1 (64-bit), and Windows 10 (64-bit).

With the Insight software, you can:

• See device information and status.

• See real-time measurement.

• Conﬁgure serial communication settings, analog input and output parameters and scaling, and environmental compensations.

• Calibrate and adjust the device.

Download Vaisala Insight software at www.vaisala.com/insight.

The probe can be connected to Vaisala Insight software using a Vaisala USB cable (no.

257295).

More Information

‣

Connecting to Insight Software (page 35)

‣

Insight Main View (page 37)

‣

Conﬁguring Modbus Communication Settings with Insight (page 39)

‣

Conﬁguring Analog Outputs with Insight (page 40)

‣

Conﬁguring Environmental Compensations with Insight (page 44)

‣

Calibration and Adjustment with Insight PC Software (page 52)

4.1.1 Basic and Advanced User Modes

You can switch between the Basic Mode and Advanced Mode user modes with the selections in the Settings menu.

Certain functionalities are only available in Advanced Mode. The options enabled by switching to Advanced Mode are often intended for administrative users: set the user mode according to the requirements of the personnel that use the device.

More Information

‣

Insight Main View (page 37)

Page 37

Vin +

Vin −

D +

D −

GND

RS-485

Chapter 4 – Operating with Insight Software

4.2 Connecting to Insight Software

• Computer with Vaisala Insight software installed

• USB connection cable (no. 257295)

• Small ﬂat head screwdriver for opening the screw terminal block screws

CAUTION!

outside the explosion hazardous area. Remove the probe from the process for conﬁguration, and use only the Vaisala accessory PC connection cable 257295 to connect the probe to Insight.

Figure 15 Connecting Probe to Insight

1. Open the Insight software.

2. Connect the USB cable to a free USB port on the PC.

3. Open the MGP261 connection box.

4. Unscrew the 6-pin screw terminal block on the MGP261 component board and lift the block out.

5. Plug the USB cable into the open port as shown in the illustration.

6. Wait for Insight software to detect the probe.

More Information

‣

Installing the Driver for the USB Service Cable (page 36)

‣

Removing Probe from Process (page 59)

The Insight PC software connection cable must be used only

Page 38

MGP261 User Guide M212273EN-A

4.2.1 Installing the Driver for the USB Service Cable

Only Windowsâ operating systems are supported by the driver of the USB service cable.

1. Connect the USB service cable to a USB port on your computer. Windowsâ detects the new device and installs the appropriate driver.

2. Open Devices and Printers from the Windowsâ Start menu. Use search to ﬁnd it if necessary (search for "devices").

3. Locate the cable in the list of devices:

• If the device is listed as Vaisala USB Device with a COM port number in brackets, the cable is ready for use. Take note of the COM port number for later use.

• If the device is listed as Vaisala USB Instrument Cable without a COM port number listed, you must install the driver manually.

4. To install the driver manually:

a. Disconnect the USB service cable from the computer.

b. Download the Vaisala USB driver at www.vaisala.com/software (search and select the

appropriate USB Instrument Driver Setup for your cable).

c. Run the USB driver installation program Vaisala USB Device Driver

Setup.exe. Accept the installation defaults.

d. Go back to step 1 and verify that the driver installation works as expected.

Page 39

3 4

Chapter 4 – Operating with Insight Software

4.3 Insight Main View

Figure 16 Insight Main Menu and Settings

1 Select to access Insight main menu.

• Conﬁgure Device: environmental compensation settings, analog input and output settings, Modbus conﬁguration, error limits and general settings.

• Export Settings: creates a text ﬁle export of the device settings.

• Calibrate: options for calibrating and adjusting methane, carbon dioxide, and water vapor output, viewing adjustment data, and restoring factory adjustments.

• Communication: contains a quick access selection for restarting the device.

• Factory Default Settings: restores the transmitter back to default settings, clears any user adjustments and restores the latest factory calibration.

• About Device: general device information such as serial number and software

2 Select Settings to switch between the Basic Mode and Advanced Mode user modes,

3 Monitoring provides options for monitoring and recording selected parameters, and

4 Device information menu with the following tabs:

version.

change the units of parameters (metric/non-metric), enter a factory code to access restricted functionalities, or view information about the Insight software.

exporting the monitoring data as a CSV (comma-separated values) ﬁle.

• Measurements: measurement graph view with parameter drop-down selection.

• Calibration Information: read-only information about the latest stored calibration.

• Diagnostics: troubleshooting and administrative information about the device status. Also includes an option to export the device error log as a text ﬁle. When contacting Vaisala support, it is recommended to include an up-to-date export of the error log with the support request.

Page 40

MGP261 User Guide M212273EN-A

5. Modbus

The probe can be accessed using the Modbus serial communication protocol. The supported Modbus variant is Modbus RTU (Serial Modbus) over RS-485 interface.

The pre-conﬁgured default Modbus serial settings are presented in the following table. Modbus communication settings can also be conﬁgured using Vaisala Insight PC software.

For a description of MGP261 Modbus registers, see Modbus Registers (page 68).

Table 6 Default Modbus Serial Communication Settings

Description Default Value

Serial bit rate 19200

Parity N

Number of data bits 8

Number of stop bits 2

Modbus device address 240

More Information

‣

Conﬁguring Modbus Communication Settings with Insight (page 39)

‣

Modbus Registers (page 68)

Page 41

Chapter 5 – Modbus

5.1 Conﬁguring Modbus Communication Settings with Insight

Figure 17 Modbus Communication Settings in Insight PC Software

You can conﬁgure the following Modbus communication settings with Insight PC software:

• Device address

• Communication bit rate

• Parity, data bits, and stop bits

• Response delay

To conﬁgure the Modbus communication settings with Insight:

1. Connect to Insight and select

2. Enter the communication values as needed: see the instructions in the Insight interface for allowed ranges and additional information.

3. Select Save to store the settings.

More Information

‣

Connecting to Insight Software (page 35)

> Conﬁgure Device > Communication.

Page 42

MGP261 User Guide M212273EN-A

6. Analog Output Conﬁguration

6.1 Overview

MGP261 has 3 scalable 4 … 20 mA analog output channels. Each output has the following conﬁguration options:

• Output parameter selection

• Output scale low end and high end

• Error output level

The conﬁguration of the outputs (output parameter selection and scaling) is selected when ordering the probe, and can be changed with Modbus or Vaisala Insight PC software.

6.2 Conﬁguring Analog Outputs with Modbus

The Modbus implementation of MGP261 includes conﬁguration registers for analog output measurement parameter selection, scaling, and error output level.

For a description of MGP261 Modbus registers, see Modbus Registers (page 68).

6.3

Conﬁguring Analog Outputs with Insight

Figure 18 Analog Output Conﬁguration Options in Insight

You can conﬁgure the measurement parameter sent on each analog output, the scaling of the parameter, and the error output level. All 3 outputs have the same conﬁguration options.

Page 43

Chapter 6 – Analog Output Conﬁguration

1. Connect to Insight (see Connecting to Insight Software (page 35)).

2. Select > Conﬁgure Device, and then one of the 3 analog outputs.

3. Select the measurement parameter that is sent on the output channel you are conﬁguring, set the scaling for the output, and deﬁne the output level that indicates an error.

4. Store the selections with Save and exit with Close.

5. Repeat the conﬁguration for each output (analog outputs 1, 2, and 3) as required.

More Information

‣

Wet Basis and Dry Basis Measurement Parameters (page 42)

6.4 Changing Units in Insight

Figure 19 Unit Selection in Insight

You can change the units of parameters (for example, metric or non-metric temperature) in the Unit Settings menu in Insight.

1. Connect to Insight (see Connecting to Insight Software (page 35)).

Page 44

MGP261 User Guide M212273EN-A

2. In the Settings dropdown menu (upper right corner of the main view), select Unit Settings.

3. Select the units for the parameters and store the selections with Save.

6.5 Wet Basis and Dry Basis Measurement Parameters

The following formula shows the conversion between wet basis and dry basis values.

X dry =

where:

X(dry) gas concentration (dry basis) (%) X(wet) gas concentration (wet basis) (%) H2O gas concentration (wet basis) (%)

Figure 20 (page 42) shows the analog output conﬁguration options in Vaisala Insight

Software with the available output parameters.

X wet

100 % ‐ H2O

Figure 20 Output Parameter Selections in Vaisala Insight PC Software

Page 45

Chapter 7 – Environmental Compensation

7. Environmental Compensation

7.1 Overview

When necessary, environmental compensations can be applied to improve the measurement accuracy (for example, to provide the probe with a real-time pressure reading from the measurement environment by using input from an external sensor).

The probe can compensate for the eects of the following parameters:

• Temperature (T)

• Pressure (P)

Environmental compensation parameters can be provided to the probe from the following sources:

• The internal temperature sensor of the probe can be used for temperature compensation.

• An external sensor can be connected to the probe (4 … 20 mA analog input, Ex ia) to

provide temperature or pressure compensation values.

• If the temperature and pressure values are known and remain constant, they can be

entered as ﬁxed setpoint values.

• If the probe is integrated in a system that measures either temperature or pressure, they

can be updated to the probe continuously.

The method used for environmental compensation is conﬁgured on the order form when ordering the probe, and can later be updated using Vaisala Insight PC software or Modbus protocol.

7.1.1 Temperature Compensation

MGP261 can measure the approximate temperature of the CARBOCAPâ sensor for compensation, use a ﬁxed setpoint value as the temperature compensation, or receive the temperature compensation value from an external temperature sensor.

Unless a dedicated temperature measurement is available and can be regularly updated to the probe, it is strongly recommended to use the probe's internal temperature compensation to ensure real-time accurate measurements. If the measurement is made in a constant temperature, the constant temperature can be set as the compensation value (ﬁxed setpoint option).

7.1.2 Pressure Compensation

The probe does not have on-board pressure measurement. You can either conﬁgure a ﬁxed setpoint value that is used as the pressure compensation, or set the probe to receive the pressure compensation value from an external pressure sensor.

Page 46

MGP261 User Guide M212273EN-A

7.1.3 Compensation Mode During Calibration

When you start to calibrate the probe with Insight, the probe enters calibration mode, and the compensation mode is automatically switched to Setpoint. In this compensation mode, you must enter the conditions of your calibration environment as temporary setpoint values in the Compensation setpoints tab of the calibration menu.

When you exit calibration mode, the values you have entered in the Compensation setpoints tab remain in use as the current setpoint values, but the compensation mode switches back to the selection that was in place before starting calibration (either O, Setpoint, Measured, or

External).

More Information

‣

Conﬁguring Environmental Compensations with Insight (page 44)

7.2 Conﬁguring Environmental Compensations

with Modbus

The Modbus implementation of MGP261 includes conﬁguration registers for pressure and temperature compensation setpoints. You can also conﬁgure the temperature and pressure compensation mode (External, Setpoint, Measured (temperature only), or O).

For a description of MGP261 Modbus registers, see Modbus Registers (page 68).

More Information

‣

Modbus (page 38)

‣

Modbus Registers (page 68)

7.3

Conﬁguring Environmental Compensations

with Insight

Using Insight, you can conﬁgure the following temperature and pressure compensation settings:

• Temperature or pressure compensation mode (select the source where the compensation value is received from)

• The setpoint values for temperature or pressure compensation

• The scaling of the analog input channel (Analog input 1) that is used to receive temperature or pressure values from an external sensor.

Figure 21 (page 45) describes the dierent environmental compensation selections in Insight.

Page 47

Chapter 7 – Environmental Compensation

Figure 21 Measurement Menu View in Insight PC Software

1 Compensation power-up defaults: conﬁgure the setpoint compensation values that are

taken into use at device reset. Used when the temperature or pressure compensation mode is set as Setpoint.

2 Compensation setpoints: conﬁgure the temporary setpoint compensation values that are

in use while the device is powered on, but revert back to power-up defaults when the device is reset. Used when the temperature or pressure compensation mode is set as Setpoint.

3 Measurement (shown in ﬁgure): conﬁgure the pressure and temperature compensation

modes (available options: Setpoint, External, Measured (temperature only), and O.

4 Analog input 1: conﬁgure the input from the external pressure or temperature sensor

(used when the pressure or temperature compensation mode is set as External).

1. Connect to Insight (see Connecting to Insight Software (page 35)),

2. Select > Conﬁgure Device.

3. Select one of the compensation modes in the Measurement menu.

4. See the separate instructions for conﬁguring the compensations in each compensation mode:

• Conﬁguring Setpoint Values for Compensations with Insight (page 46)

• Using Probe Measurement as Temperature Compensation (page 46)

• Using Compensation Received from External Temperature or Pressure Sensor

(page 46)

• Conﬁguring Input from External Analog Pressure or Temperature Sensor (page 47)

More Information

‣

Compensation Mode During Calibration (page 44)

Page 48

MGP261 User Guide M212273EN-A

7.3.1 Conﬁguring Setpoint Values for Compensations with Insight

To conﬁgure a ﬁxed setpoint value for pressure or temperature compensation in Insight:

1. Select > Conﬁgure Device.

2. Open the Measurement menu, set the compensation mode of the compensation parameter (temperature, pressure, or both) as Setpoint from the mode selection dropdown list, and select Save when done.

3. Open the Compensation setpoints menu, enter the setpoint value in the text ﬁeld, and select Save when done.

Note that the setpoint value you enter in the Compensation setpoints is temporary and resets back to the power-up default at device reset.

4. Optional: If you want to keep the setpoint value in use also after device reset, enter the same value in the Compensation power-up defaults menu and store the setting by selecting Save.

7.3.2 Using Probe Measurement as Temperature Compensation

To set the internal temperature measurement of the probe as the temperature compensation source:

1. Select > Conﬁgure Device.

2. Open the Measurement menu.

3. Select Measured from the Temperature compensation mode dropdown list, and then select Save.

7.3.3 Using Compensation Received from External Temperature or Pressure Sensor

If you have connected an external pressure or temperature sensor to the 4 … 20 mA Ex ia analog input channel of MGP261 (see Wiring (page 28)), you can use the measurement received from the sensor as the environmental compensation.

You can receive the compensation value from an external sensor for only one parameter (temperature or pressure) at a time.

To use an external sensor for temperature or pressure compensation:

1. Select

2. Open the Measurement menu.

> Conﬁgure Device.

Page 49

Chapter 7 – Environmental Compensation

3. Select External from either the Pressure compensation mode or the Temperature compensation mode dropdown list, and then select Save.

4. Open the Analog input 1 menu and conﬁgure the scaling of the external sensor input. See

Conﬁguring Input from External Analog Pressure or Temperature Sensor (page 47).

7.3.4 Conﬁguring Input from External Analog Pressure or Temperature Sensor

When you set either the Temperature compensation mode or Pressure compensation mode to use measurement from an External sensor, you can conﬁgure the scale of the external sensor input in the Analog input 1 menu.

The Input mode and Input parameter selections are set automatically based on the external compensation parameter selection.

Figure 22 Analog Input 1 Conﬁguration Menu in Insight

1. In the Measurement menu, set either the pressure or temperature compensation mode as External to use input from a connected sensor. See Using Compensation Received from

External Temperature or Pressure Sensor (page 46).

You can receive the compensation value from an external sensor for only one parameter (temperature or pressure) at a time.

2. Store the setting with Save.

3. In the Analog input 1 menu, enter the scaling for the temperature or pressure input from the external sensor.

Page 50

MGP261 User Guide M212273EN-A

4. Store the setting with Save.

Page 51

Chapter 8 – Calibration

8. Calibration

8.1 Calibration Overview

The methane (CH4) and carbon dioxide (CO2) measurements of MGP261 can be calibrated and adjusted using gas references with known values. You can also calibrate and adjust the probe's

internal temperature measurement (used for environmental compensation only). The H2O measurement can only be adjusted at the low end (simultaneously with CH4 and CO2 when a zero point adjustment is made).

Carrying out calibrations and adjustments requires connecting MGP261 to Vaisala Insight PC software (requires Vaisala USB cable 257295). For instructions on connecting the probe to Insight, see Connecting to Insight Software (page 35).

To feed reference gases to MGP261 in a controlled manner when calibrating and adjusting, use a ﬂow-through adapter. An MGP261 ﬂow-through adapter is available as an optional accessory: for more information, see Flow-Through Adapter (page 50).

WARNING!

adjustment, review the instructions in Removing Probe from Process

(page 59).

The following calibration and adjustment options are available when the probe is connected to Vaisala Insight PC software:

• Methane (CH4) and carbon dioxide (CO2) measurement calibration and adjustment (1point or 2-point adjustments).

• Temperature measurement adjustment (probe's internal sensor measurement used only for environmental compensation).

• Zero point adjustment for all gas measurement parameters (CH4, CO2, and H2O: adjusts all parameters simultaneously). Zero point adjustment replaces the low end adjustment of all

gas parameters in 2-point adjustments.

• Reset to factory adjustment (given separately for each parameter).

The accuracy of ﬁeld calibration and adjustment is dependent on a number of factors such as sucient stabilization time, calibration setup conditions, and reference quality. To ensure fully accurate calibration and adjustment results, use the traceable calibration and adjustment services provided by Vaisala.

More Information

‣

Connecting to Insight Software (page 35)

‣

Flow-Through Adapter (page 50)

‣

Removing Probe from Process (page 59)

Before removing the probe from the process for calibration and

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MGP261 User Guide M212273EN-A

8.1.1 Compensation Mode During Calibration

External).

More Information

‣

Conﬁguring Environmental Compensations with Insight (page 44)

8.1.2 Flow-Through Adapter

The MGP261 ﬂow-through adapter (Vaisala order code: 258877) is used in sampling line installations and ﬁeld calibration and adjustment to achieve a controlled ﬂow of gas to the probe.

The ﬂow-through adapter is delivered assembled with a mounting clamp, mounting plate, and a gland for attaching the probe to the adapter. Figure 23 (page 50) shows the main parts of the ﬂow-through adapter and mounting kit.

Figure 23 Flow-Through Adapter 258877

1 Probe clamp (industrial M8, 38-44

mm, insulated) and tightening screws

2 Mounting plate for screw or cable

mounting

3 Probe gland (M50/9x1.5, 37.0 - 42.0

mm) tightening nut for inserting and removing the probe: only open and

tighten from the tightening nut

4 Probe gland locknut: locked to the

threads with Loctite threadlocker, do

not rotate

5 Gas tube inlet and outlet ports (G 1/8)

on opposite sides of the adapter body

For instructions on attaching the ﬂow-through adapter and setting the correct installation type conﬁguration in Vaisala Insight PC software, see Attaching Flow-

Through Adapter to MGP261 (page 31).

Page 53

More Information

‣

Installation Option: Flow-Through Adapter Installation (page 23)

‣

Attaching Flow-Through Adapter to MGP261 (page 31)

‣

Installation Type Conﬁguration in Insight (page 33)

‣

Flow-Through Adapter Dimensions (page 67)

Chapter 8 – Calibration

Page 54

4 5

MGP261 User Guide M212273EN-A

8.2 Calibration and Adjustment with Insight PC Software

Figure 21 (page 45) describes the calibration and adjustment selections in Insight.

Figure 24 Calibration Menu View in Insight PC Software

Calibration information: enter information about the latest calibration (date, text

description) in this tab. Also includes the calibration interval and calibration reminder

selections.

2 Factory calibration: shows read-only information about the factory calibration. 3 Zero point adjustment: adjusts the zero point signal (simultaneously for all gas

measurement parameters). This adjustment replaces the low end adjustment in 2-point

adjustments.

4 Compensation setpoint conﬁguration for the calibration and adjustment environment. 5 Methane (CH4) measurement adjustment tab. In 2-point adjustments, use this tab for high

end adjustment and the zero point adjustment for low end adjustment.

6 Carbon dioxide (CO2) measurement adjustment tab. In 2-point adjustments, use this tab

for high end adjustment and the zero point adjustment for low end adjustment.

7 Temperature measurement adjustment tab. 8 Adjustment data tabs show the latest stored adjustment for each parameter. Use the scroll

arrows next to the menu tabs on the left and right edge of the view to view all tabs.

1. Connect to Insight (see Connecting to Insight Software (page 35)),

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Chapter 8 – Calibration

2. Select > Calibrate > Yes.

3. Select one of the adjustment options in the Calibrate menu and see the separate instructions for each option.

8.2.1 Example: 2-Point Adjustment with Zero Point Adjustment

When making a 2-point adjustment, the low end adjustment is carried out simultaneously for all measurement parameters by adjusting the zero point signal in the Zero point adjustment tab.

This means that, instead of carrying out a 2-point adjustment for each measurement parameter separately using a low end and a high end reference, the low end adjustment of all measurement parameters is replaced with the zero point adjustment. After making the zero point adjustment, you only need to adjust the high end measurement of each measurement parameter when making a 2-point adjustment.

Example procedure outline for 2-point adjustment of CH4 and CO2 using nitrogen as the 0% reference (Zero point adjustment) and a 60 % CH4 / 40 % CO2 gas mixture as the reference for the second adjustment points:

1. Zero point adjustment tab: adjust the zero signal (low end reference point, 0 %) for both CH4 and CO2 using nitrogen.

2. CH₄ adjustment tab: adjust the high end reference point (60 %) for CH4 using the CH4 CO2 mixture.

3. CH₄ adjustment tab: activate the CH4 adjustment.

4. CO₂ adjustment tab: adjust the high end reference point (40 %) for CO2 using the CH4 CO2 mixture.

5. CO₂ adjustment tab : activate the CO2 adjustment.

8.2.2 Zero Point Adjustment

The zero point adjustment adjusts the zero output signal of the probe and applies simultaneously to all gas measurement parameters (CH4, CO2, and H2O,). This means that,

instead of carrying out a 2-point adjustment for each gas measurement parameter separately using a low end and high end reference, the low end adjustment of all gas measurement parameters is replaced with the zero point adjustment.

After carrying out the zero point adjustment, you only need to adjust the high end measurement of each gas measurement parameter when carrying out a 2-point adjustment.

Always use nitrogen as the reference gas for the zero point adjustment.

Page 56

1 2

MGP261

MGP261 User Guide M212273EN-A

Figure 25 Zero Point Adjustment Tab

1 Follow the signal stabilization from the graph and the numeric value shown above the

graph.

2 After the signal has stabilized, select Start adjustment and wait for the notiﬁcation

message about successful zero point adjustment activation. The adjustment is saved automatically.

1. Insert your device into the 0 % reference environment (nitrogen).

2. Wait for the signal level to stabilize. You can follow the stabilization from the graph and the numeric value shown above the graph.

3. After the signal level has stabilized, select Start adjustment.

4. Wait until Insight displays a notiﬁcation about successful zero point adjustment activation. The adjustment typically takes 2-3 minutes.

5. The zero point adjustment is saved automatically after it has been successfully activated. To remove an incorrect adjustment, select Restore factory adjustment.

6. For a 2-point adjustment, carry out the high end adjustments for each measurement parameter in the separate adjustment tabs using appropriate references (for example, a 60 % CH4 / 40 % CO2 gas mixture).

8.2.3 Calibrating and Adjusting Methane (CH4) Measurement

Prepare the calibration gases required to create the reference condition for the adjustment, and the setup for controlled calibration gas feed to the probe.

Page 57

Chapter 8 – Calibration

When making a 2-point adjustment, ﬁrst carry out the zero signal adjustment in the Zero point adjustment tab. The zero signal adjustment replaces the low end adjustment in a 2-point adjustment.

1. Reset any possible existing adjustments with the Restore factory adjustment button. This prevents earlier adjustments from having an eect on the current adjustment.

2. Insert your device in the reference environment.

3. Before starting the adjustment, make sure that your environmental compensation settings are correct for your present environment. You can review and change the settings for pressure and temperature compensation setpoints in the Compensation setpoints tab.

4. Wait for the measurement (shown in the graph) to stabilize fully.

5. When the measurement has stabilized, click the Reference value, point 1 text box and enter the known CH4 level of the calibration point. Press ENTER or click outside the text

box when done.

6. Check that the measured value for point 1 is automatically inserted.

7. Check the dierence between the reference and the measured value. Very large dierences may be due to insucient stabilization time or unsuitable calibration setup.

a. If you want to apply the adjustment you have made, select Activate adjustment.

b. To exit without taking the adjustment in use, select Close.

8. After completing the adjustment, update the information in the Calibration Information tab.

8.2.4 Calibrating and Adjusting Carbon Dioxide (CO2) Measurement

Prepare the calibration gases required to create the reference condition for the adjustment, and the setup for controlled calibration gas feed to the probe.

When making a 2-point adjustment, ﬁrst carry out the zero signal adjustment in the Zero point adjustment tab. The zero signal adjustment replaces the low end adjustment in a 2-point adjustment.

1. Reset any possible existing adjustments with the Restore factory adjustment button. This prevents earlier adjustments from having an eect on the current adjustment.

2. Insert your device in the reference environment.

4. Wait for the measurement (shown in the graph) to stabilize fully.

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MGP261 User Guide M212273EN-A

5. When the measurement has stabilized, click the Reference value, point 1 text box and enter the known CO2 level of the calibration point. Press ENTER or click outside the text

box when done.

6. Check that the measured value for point 1 is automatically inserted.

7. Check the dierence between the reference and the measured value. Very large dierences may be due to insucient stabilization time or unsuitable calibration setup.

a. If you want to apply the adjustment you have made, select Activate adjustment.

b. To exit without taking the adjustment in use, select Close.

8. After completing the adjustment, update the information in the Calibration Information tab.

8.2.5 Calibrating and Adjusting Temperature Measurement

Figure 26 Temperature Adjustment View in Insight

Prepare a temperature calibrator or similar to create a suitable reference condition.

You can adjust temperature either in nitrogen or in air.

1. Insert your device in the reference environment.

2. Wait for the measurement (shown in the graph) to stabilize fully.

Page 59

Chapter 8 – Calibration

3. When the measurement has stabilized, click the Reference value, point 1 text box and enter the known temperature of the calibration point. Press ENTER or click outside the text box when done.

4. Check that the measured value for point 1 is automatically inserted.

5. Check the dierence between the reference and the measured value. Very large dierences may be due to insucient stabilization time or unsuitable calibration setup.

a. If you want to apply the adjustment you have made, select Activate adjustment.

b. To exit without taking the adjustment in use, select Close.

6. After completing the adjustment, update the information in the Calibration Information tab.

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MGP261 User Guide M212273EN-A

9. Maintenance

9.1 Filter Change

Figure 27 Replacing Filter

Replacement ﬁlters are available from Vaisala (order code: DRW249919SP). Remove the ﬁlter by rotating counter-clockwise.

CAUTION!

when replacing the ﬁlter.

The probe ﬁlter is the only user-replaceable part in MGP261. For other maintenance requirements, contact Vaisala.

Do not touch the optical surfaces inside the measurement cuvette

Page 61

9.2 Removing Probe from Process

Chapter 9 – Maintenance

WARNING!

contact with the biogas process. Bacteria, viruses, or fungi can be carried from the process on the probe surface.

• Always wear appropriate personal protective equipment when handling items that have been in contact with the biogas process. Follow local regulations and site-speciﬁc guidelines.

• Ensure the area where you place the probe after removing it from the process is suitable for working with items that have been in contact with the biogas process.

WARNING!

ﬂammable gas release or ﬂame entrance.

WARNING!

(H2S)) is possible when installing or removing MGP261 from the process.

• Always follow local safety guidelines. Ensure that the work area is safe and meets local regulations (for example, related to ventilation and personal protective equipment).

• Use a personal gas detector to monitor the safety of the area you are working in.

• After installing or removing the probe, use a gas detector to ensure that process connections are leak-free.

1. Prepare an area where you can place the probe after removing it from the process.

a. Clear other items and equipment away from the area.

b. Cover surfaces around the area with protective material as necessary.

2. Switch o the probe power supply input.

3. If necessary, open the connection box and remove the wiring cables. See Inserting Probe

into Process and Opening Connection Box (page 27).

a. Hold the probe in place by gripping the tightening nut with a wrench. Then open the

connection box by turning the cover counter-clockwise with the connection box key.

b. Loosen the cable glands and pull the connection box open.

c. Open the screw terminals inside the connection box with a small screwdriver and

remove the wiring cables.

d. Close the connection box.

When installed in situ, the surface of the probe is in direct

While installing or uninstalling the device, there is a risk of

Exposure to hazardous gases (for example, hydrogen sulﬁde

Page 62

MGP261 User Guide M212273EN-A

4. Rotate the tightening nut of the probe counter-clockwise with a wrench to release the probe. See Inserting Probe into Process and Opening Connection Box (page 27).

CAUTION!

rotate the probe open, and must be replaced when reinstalling the probe.

5. Pull the probe out of the process connection and place it on the area you prepared for handling the probe. Hold the probe from the connection box when handling it, and avoid touching the parts that have been inserted into the process.

Use a cloth or similar to prevent dripping when pulling out the probe.

6. Ball valve installations only: remove the safety pin that locks the handle of the ball valve in the open position and close the ball valve.

7. Clean the probe as instructed in Cleaning the Probe (page 60) and move the probe to a clean area for further handling.

8. When reinstalling the probe, repeat the installation steps starting from Preparing Probe

for Installation (page 26).

9.3

Cleaning the Probe

WARNING!

biological and chemical hazards due to the nature of the biogas process environment. Review the warnings and instructions listed in Removing Probe

from Process (page 59).

The PTFE tape seal on the probe threads will tear when you

Removing the probe from the process can expose you to

• Moist cloth for wiping the probe

• Running water

• Standard cleaning agents can be used in cleaning

1. Prepare an area for cleaning the probe.

2. To remove the probe from process, follow the instructions in Removing Probe from

Process (page 59).

Page 63

Chapter 9 – Maintenance

3. Clean the probe with running water and a cloth. Standard cleaning agents can be used.

Do not clean the probe with a pressure washer.CAUTION!

Do not immerse the probe in liquid to clean it.CAUTION!

4. To install the probe back into the process after cleaning, follow the installation instructions starting from Preparing Probe for Installation (page 26).

5. If you are sending the probe to Vaisala for maintenance, allow it to dry fully before packing it. See the instructions in Sending Probe to Vaisala (page 61).

9.4

Sending Probe to Vaisala

If you need to return the probe for maintenance or replacement, contact Vaisala technical support.

CAUTION!

support. Technical support will provide you with return authorization and up-todate shipping instructions.

1. Read the warranty information.

2. Contact Vaisala technical support and request a Return Material Authorization (RMA) and shipping instructions.

3. Follow the return instructions received from Vaisala technical support. When packing the probe for shipping, ensure that you use sucient padding, the probe has dried completely after cleaning, and that the probe is tightly sealed in a plastic bag.

Do not ship the probe to Vaisala without contacting technical

For information on product warranties, technical support, and repair services, see www.vaisala.com/support.

Always request the RMA before returning any material to Vaisala.

Page 64

MGP261 User Guide M212273EN-A

10. Technical Data

10.1 Speciﬁcations

Table 7 Measurement Performance

Property Methane CH

Carbon Dioxide CO

Water Vapor H2O

Sensor CARBOCAPâ CARBOCAPâ CARBOCAPâ

Measurement unit Volume-% Volume-% Volume-%, dew point

°C

Measurement range 0 … 100 vol-% 0 … 100 vol-% 0 … 25 vol-%,

-10 … +60 °C (14 … +140 °F)

Accuracy

speciﬁcation

at 25 °C (+77 °F) and 1013 mbar including non-linearity, calibration

uncertainty, and repeatability; temperature and pressure compensated

Accuracy at +25 °C (+77 °F) and

1013 mbar

• 0 ... 40 vol-%:

±2 vol-%

• 40 ... 70 vol-%:

±1 vol-%

• 70 ... 100 vol-%:

±2 vol-%

• 0 ... 30 vol-%:

• ±2 vol-%

• 30 ... 50 vol-%:

±1 vol-%

• 50 ... 100 vol-%:

±2 vol-%

0 ... 25 vol-%:

±0.5 vol-%

Repeatability ±0.5 vol-% at 60 vol-% ±0.3 vol-% at 40 vol-% ±0.1 vol-% at 10 vol-%

Temperature dependence

Pressure dependence Compensated,

Compensated, 0 ... 100 vol-%: ±0.1 % of reading/°C

Uncompensated, 0 ... 100 vol-%: -0.6 % of reading/°C

0 ... 100 vol-%: ±0.015 % of reading/ mbar

Uncompensated, 0 ... 100 vol-%: +0.2 % of reading/ mbar

Compensated, 0 ... 100 vol-%: ±0.1 % of reading/°C

Uncompensated, 0 ... 100 vol-%: -0.2 % of reading/°C

Compensated, 0 ... 100 vol-%: ±0.01 % of reading/ mbar

Uncompensated, 0 ... 100 vol-%: +0.2 % of reading/ mbar

Compensated, 0 ... 25 vol-%: ±0.1 % of reading/°C

Uncompensated, 0 ... 25 vol-%: -0.2 % of reading/°C

Compensated, 0 ... 25 vol-%: ±0.025 % of reading/ mbar

Uncompensated, 0 ... 25 vol-%: +0.15 % of reading/

mbar

Long-term stability ±2 vol-%/year ±2 vol-%/year ±2 vol-%/year

Start-up time

Warm-up time

Response time (T90)

2 min

90 s

30 s

Page 65

Chapter 10 – Technical Data

Property Methane CH

Response time with ﬂow-through adapter

Carbon Dioxide CO

Water Vapor H2O

90 s at ≥ 0.5 l/min

(recommended: 0.5 … 1 l/min)

1) Excluding cross-interferences to other gases.

2) Time to ﬁrst reading

3) Time to speciﬁed accuracy

4) At +20 °C (+68 °F) ambient temperature

5) With standard PTFE ﬁlter

Table 8 Operating Environment

Property Speciﬁcation

Operating temperature range -40 ... +60 °C (-40 ... +140 °F)

Operating humidity range 0 ... 100 %RH

Storage temperature range -40 ... +60 °C (-40 ... +140 °F)

Storage humidity range 0 ... 90 %RH

Process pressure range -500 ... +500 mbar(g)

Process temperature range +0 ... +60 °C (+32 ... +140 °F)

Process ﬂow range

0 … 20 m/s

1) A process ﬂow range of 2 … 20 m/s is suitable for in situ installations (probe installed directly into process). For process ﬂow ranges between 0 … 2 m/s, a ﬂow-through installation is recommended.

Table 9 Compliance

Property Speciﬁcation

Electromagnetic compatibility (EMC) EN61326-1(2014), Industrial environment

Ex classiﬁcation Ex II 1/2 (1) G Ex eb mb [ia] IIB T3 Ga/Gb -40 °C

≤ Tamb ≤ +60 °C

IP rating IP66

Table 10 Inputs and Outputs

Property Speciﬁcation

Operating voltage 18 ... 30 VDC

Power consumption Typical: 3 W

Maximum: 6 W

Page 66

MGP261 User Guide M212273EN-A

Property Speciﬁcation

Digital output RS-485 (Modbus RTU)

Analog output 3 × 4 ... 20 mA scalable, isolated

Analog output load Minimum: 20 Ω

ximum: 500 Ω

Analog output accuracy ±0.2 % of full scale at 25 °C (77 °F)

Analog output temperature dependence 0.005 %/˚C (0.003 %/°F) full scale

Analog input (optional) 1 × 4 ... 20 mA (Ex ia) for external pressure or

emperature sensor

1) The optional analog input is galvanically isolated and provides power for the connected e

xternal pressure sensor.

Table 11 Mechanical Speciﬁca

Property Speciﬁcation

tion

Weight 2.5 kg (5.5 lb)

Thread type 1.5" male NPT

Cable lead-throughs 1 x M16x1.5

2 x M20x1.5

Materials

Probe body AISI316L stainless steel, PPS

Filter cap Sintered PTFE

Table 12 Options and Accessories

Item Order Code

Conﬁguration cable (RS485/USB)

257295

Flow-through adapter 258877

Sintered PTFE ﬁlt

er (includes O-ring) DRW249919SP

Connection box key DRW250233SP

Shipping sleeve ASM213114SP

NPT 1.5" thread test plug 257525SP

1) Vaisala Insight software for Windows

available at www.vaisala.com/insight.

Page 67

Wetted Parts Material Information

10.2

er 10 – Technical Data

Chapt

Vaisala Oyj, as a manufacturer of the Vaisala CARBOCAP Multigas Probe MGP261, certiﬁes the materials used in the wetted parts of the MGP261 probe are the following:

1 Probe body: AISI 316L, EN 1.4404 (X2CrNiMo17-12-2) (AISI 316L) 2 Sensor package window 3 O-ring: ethylene-propylene rubber, black 4 Measurement cuvette: PPS GF40 (polyphenylene sulﬁde, 40 % glass ﬁbers, black) 5 Infrared measurement mirror: Optical borosilicate glass, class BK7 6 Filter cap: PTFE (polytetraﬂuoroethylene, porous/solid structure)

: polished sapphire

that

Page 68

Ø 32

[1.26]

Ø 80.5 [3.17]

1 .5” NPT

M16x1.5

M20x1.5

Ø 40 [1.57]

Ø 80.5 [3.17]

E - E

6 [0.24]

[0.56]

142 [5.59]

179 [7.05]

388 [15.27]

Ø 34 [1.34]

402 [15.83]

20 [0.79]

17 [0.67]

209 [8.23]

[1.85]

mm [in]

MGP261 User Guide M212273EN-A

10.3 MGP261 Dimensions

Figure 28 (page 66) shows the MGP261 dimensions. The ﬁgure also shows the cabling lead-

through depth: for more information on cable gland options and lead-through dimensions, see

Cable Gland Options and Lead-Throughs (page 14).

Figure 28 MGP261 Dimensions in Millimeters and Inches

Page 69

415[16.33]

130[5.1]

198[7.8]

G 1/8

Ø 55 [21.7]

Ø76 [29.9]

186 (±1 mm) [7.32]

Distance at correct installation depth

[in]

Ø 10 [0.39]

90 [3.54]

14.4 [0.56]

R20

Ø 6.2 [0.24]

9.1 [0.36]

39.1 [1.53]

12.5 [0.49]

30 [1.18]

70 [2.75]

mm [in]

74 [2.91]

48.2 [1.9]

30 [1.18]

9.1 [0.36]

Chapter 10 – Technical Data

10.4 Flow-Through Adapter Dimensions

Figure 29 (page 67) shows the dimensions of the MGP261 ﬂow-through adapter 258877 with

MGP261 installed into the adapter. The dimension ﬁgure also shows the measurement (from the edge of the adapter mounting plate to the edge of the connection box) that can be used to verify that the probe has been inserted to correct installation depth. The dimensions are given in millimeters and [inches].

Figure 29 Flow-Through Adapter Dimensions with MGP261 Probe

Figure 30 (page 67) shows the dimensions and screw hole sizes of the ﬂow-through adapter

mounting plate.

Figure 30 Flow-Through Adapter Mounting Plate Dimensions

Page 70

MGP261 User Guide

Appendix A. Modbus Registers

A.1 Modbus Registers

M212273EN-A

CAUTION!

addr

Registers are numbered in decimal, starting from one. Register

esses in actual Modbus messages (Modbus Protocol Data Unit (PDU) are in hexadecimal and start from zero. Subtract 1 from the register number presented in this manual to get the address used in the Modbus message. For example, the register number 769 (Modbus address) corresponds to address 0300

hex

in the

Modbus message.

Accessing unavailable (temporarily missing) measurement data does not generate an

xception. “Unavailable” value (a quiet NaN for ﬂoating point data or 0000

for integer data)

hex

is returned instead. An exception is generated only for any access outside the applicable register ranges.

A.1.1 Measurement Data

Table 13 Modbus Measurement Data Registers (Read-Only)

Floating Point Values

Address (He

1 0000

0001

3 0002

0003

5 0004

0005

7 0006

0007

9 0008

0009

11 000A

000B

xadecimal)

hex

Methane (CH4)

32-bit ﬂoat ppm

concentration

Methane (CH4)

32-bit ﬂoat ppm

concentration, dry basis

Carbon dioxide (CO2)

32-bit ﬂoat ppm

concentration

Carbon dioxide (CO2)

32-bit ﬂoat ppm

concentration, dry basis

Water (H2O)

32-bit ﬂoat ppm

concentration

Water (H2O)

32-bit ﬂoat ppm

concentration, dry basis

Page 71

Appendix A

Floating Point Values

Address (Hexadecimal)

13 000C

000D

15 000E

000F

17 0010

0011

Integer values

257 0100

258 0101

259 0102

260 0103

261 0104

262 0105

263 0106

264 0107

hex

Dew point temperature 32-bit ﬂoat Td °C

Dew / frost point

32-bit ﬂoat Tdf °C

temperature

Sensor temperature 32-bit ﬂoat Ts °C

Methane (CH4) concentration

16-bit integer ppmv / 100

(parts per ten thousand)

Methane (CH4) concentration, dry basis

16-bit integer ppmv / 100

(parts per ten thousand)

Carbon dioxide (CO2) concentration

16-bit integer ppmv / 100

(parts per ten thousand)

Carbon dioxide (CO2) concentration, dry basis

16-bit integer ppmv / 100

(parts per ten thousand)

Water (H2O) concentration

16-bit integer ppmv / 100

(parts per ten thousand)

Water (H2O) concentration, dry basis

16-bit integer ppmv / 100

(parts per ten thousand)

Dew point temperature 16-bit integer (×

10)

Dew / frost point temperature

16-bit integer (×

10)

Tdf °C

Tdf °F

Tdf °C

Tdf °F

Page 72

MGP261 User Guide M212273EN-A

A.1.2 Conﬁguration Registers

Table 14 Modbus Conﬁguration Data Registers (Writable)

Environmental Compensation

769 0300

771 0302

773 0304

775 0306

Function Control

1281 0500

1282 0501

1283 0502

Communication

1537 0600

Address (Hexadecimal)

hex

Power-up value for pressure compensation

32-bit ﬂoat hPa

Range: 450 … 1550

Init/default: 1013.25

Power-up value for temperature compensation

Volatile pressure compensation (value cleared at probe reset)

32-bit ﬂoat °C

Range: -10 … 70

Init/default: 25

32-bit ﬂoat hPa

Range 450 ... 1550 hPa

Init/default: 1013.25

Volatile temperature compensation (value cleared at probe reset)

Pressure compensation mode selection

32-bit ﬂoat °C

Range: -10 … 70

Init/default: 25

Enum 0 = O

1 = Setpoint

2 = External

Temperature compensation mode selection

Enum 0 = O

1 = Setpoint

2 = Measured

3 = External

Installation type selection Enum 0 = Directly in

process

1 = Flowthrough adapter

Serial address 16-bit integer Valid range 1 …

255

Default: 240

Page 73

Communication

1538 0601

1539 0602

1540 0603

1541 0604

Analog Output 1

1794 0701

hex

Appendix A

Bit rate Enum Valid range

4800 … 115200

4 = 4800

5 = 9600

6 = 19200

7 = 38400

8 = 57600

9 = 115200

(default: 6 (19200))

Parity, data, stop bits Enum 0 = N,8,1

1 = N,8,2

2 = E,8,1

3 = E,8,2

4 = O,8,1

5 = O,8,2

Response delay 16-bit integer Valid range 0 …

1000

Restart device Function

Analog output 1 measurement parameter selection. When written, scalings are reset.

Reg 0000

wet basis)

0002 dry basis)

0004

hex

(CH

(CO

wet basis)

0006

(CO

hex

dry basis)

0008

(H2O

hex

wet basis)

000A

(H2O

hex

dry basis)

000C

(Td)

hex

000E

(Tdf)

hex

See Table 13

(page 68)

Page 74

MGP261 User Guide M212273EN-A

Analog Output 1

1795 0702

hex

Scale low end for analog output 1 measurement parameter.

Minimum and maximum values vary for dierent parameters.

Float Output

parameters

0000 wet basis)

0002 dry basis)

0004

hex

(CH

(CO

wet basis)

0006

(CO

hex

dry basis):

Minimum: 0

Maximum: 1000000

Output parameters

0008

(H2O

hex

wet basis)

000A

(H2O

hex

dry basis):

Minimum: 0

Maximum: 250000

Output parameters

000C

(Td)

hex

000E

(Tdf):

hex

Minimum: -10

Maximum: 60

Page 75

Analog Output 1

1797 0704

1799 0706

hex

Appendix A

Scale high end for analog output 1 measurement parameter.

Minimum and maximum values vary for dierent parameters.

Float Output

parameters

0000 wet basis)

0002 dry basis)

0004

hex

(CH

(CO

wet basis)

0006

(CO

hex

dry basis):

Minimum: 0

Maximum: 1000000

Output parameters

0008

(H2O

hex

wet basis)

000A

(H2O

hex

dry basis):

Minimum: 0

Maximum: 250000

Output parameters

000C

(Td)

hex

000E

(Tdf):

hex

Minimum: -10

Maximum: 60

Error output level (mA) Float Min. 0.5 mA

Max. 24 mA

Page 76

MGP261 User Guide M212273EN-A

Analog Output 2

2050 0801

hex

Analog output 2 measurement parameter selection. When written, scalings are reset.

Reg 0000

wet basis)

0002 dry basis)

0004

hex

(CH

(CO

wet basis)

0006

(CO

hex

dry basis)

0008

(H2O

hex

wet basis)

000A

(H2O

hex

dry basis)

000C

(Td)

hex

000E

(Tdf)

hex

See Table 13

(page 68)

Page 77

Analog Output 2

2051 0802

hex

Scale low end for analog output 2 measurement parameter.

Minimum and maximum values vary for dierent parameters.

Float Output

parameters

0000 wet basis)

0002 dry basis)

0004 wet basis)

0006 dry basis):

Minimum: 0

Maximum: 1000000

Output parameters

0008 wet basis)

000A dry basis):

Minimum: 0

Maximum: 250000

Output parameters

000C

000E

Minimum: -10

Maximum: 60

Appendix A

(CH

hex

(CH

hex

(CO

hex

(CO

hex

(H2O

hex

(H2O

hex

(Td)

hex

(Tdf):

hex

Page 78

MGP261 User Guide M212273EN-A

Analog Output 2

2053 0804

hex

Scale high end for analog output 2 measurement parameter.

Minimum and maximum values vary for dierent parameters.

Float Output

parameters

0000 wet basis)

0002 dry basis)

0004

hex

(CH

(CO

wet basis)

0006

(CO

hex

dry basis):

Minimum: 0

Maximum: 1000000

Output parameters

0008

(H2O

hex

wet basis)

000A

(H2O

hex

dry basis):

Minimum: 0

Maximum: 250000

Output parameters

000C

(Td)

hex

000E

(Tdf):

hex

Minimum: -10

Maximum: 60

2055 0806

hex

Error output level (mA) Float Min. 0.5 mA

Max. 24 mA

Page 79

Analog Output 3

2306 0901

hex

Analog output 3 measurement parameter selection. When written, scalings are reset.

Reg 0000

wet basis)

0002 dry basis)

0004 wet basis)

0006 dry basis)

0008 wet basis)

000A dry basis)

000C

000E

See Table 13

(page 68)

Appendix A

(CH

hex

(CH

hex

(CO

hex

(CO

hex

(H2O

hex

(H2O

hex

(Td)

hex

(Tdf)

hex

Page 80

MGP261 User Guide M212273EN-A

Analog Output 3

2307 0902

hex

Scale low end for analog output 3 measurement parameter.

Minimum and maximum values vary for dierent parameters.

Float Output

parameters

0000 wet basis)

0002 dry basis)

0004

hex

(CH

(CO

wet basis)

0006

(CO

hex

dry basis):

Minimum: 0

Maximum: 1000000

Output parameters

0008

(H2O

hex

wet basis)

000A

(H2O

hex

dry basis):

Minimum: 0

Maximum: 250000

Output parameters

000C

(Td)

hex

000E

(Tdf):

hex

Minimum: -10

Maximum: 60

Page 81

Analog Output 3

2309 0904

2311 0906

Analog Input 1

2562 0A01

hex

Appendix A

Scale high end for analog output 3 measurement parameter.

Minimum and maximum values vary for dierent parameters.

Float Output

parameters

0000 wet basis)

0002 dry basis)

0004

hex

(CH

(CO

wet basis)

0006

(CO

hex

dry basis):

Minimum: 0

Maximum: 1000000

Output parameters

0008

(H2O

hex

wet basis)

000A

(H2O

hex

dry basis):

Minimum: 0

Maximum: 250000

Output parameters

000C

(Td)

hex

000E

(Tdf):

hex

Minimum: -10

Maximum: 60

Error output level (mA) Float Min. 0.5 mA

Max. 24 mA

Analog input 1 compensation parameter.

Read-only: controlled by the pressure and temperature

Reg 0204

(pressure)

0206 (temperature)

hex

compensation mode registers.

Page 82

MGP261 User Guide M212273EN-A

Analog Input 1

2563 0A02

Scale low end for analog input 1 compensation parameter.

Minimum and maximum values vary for dierent parameters.

Float 0204

(pressure)

Minimum: 0

Maximum: 20 000

0206

hex

(temperature)

Minimum: -200

Maximum: 400

2565 0A04

Scale high end for analog input 1 compensation parameter.

Minimum and maximum values vary for dierent parameters.

Float 0204

(pressure)

Minimum: 0

Maximum: 20 000

0206

hex

(temperature)

Minimum: -200

Maximum: 400

2567 0A06

Input value (read-only) Float

A.1.3 Status Registers

Table 15 Modbus Status Data Registers (Read-Only)

513 0200

517 0204

519 0206

Address (Hexa

cimal)

0202

Error code 32-bit signed

hex

Pressure compensation

hex

values in use

Temperature

hex

compensation values in use

integer

Float

0201

(status code low): see

hex

Table 16 (page 81).

0202

(status code high):

hex

see Table 17 (page 82)

Page 83

Appendix A

Address (Hexa-

cimal)

521 0208

522 0209

523 020A

524 020B

525 020C

526 020D

527 020E

528 020F

529 0210

hexCH4

measurement

status

hexCH4

measurement

status (dry basis)

hexCO2

measurement

status

hexCO2

measurement

status (dry basis)

O measurement

hexH2

status

measurement status 16-bit signed

hexTdf

measurement status 16-bit signed

hexTs

Device status 16-bit signed

hex

Clear error log: the error

hex

log is cleared if 1 is

16-bit signed integer

integer

Function

written, other values are ignored. Register always reads as 0.

0000

hex

0001

: Reading is not

hex

reliable

0002

: Under range

hex

0003

: Over range

hex

0004

hex

0005

: Value locked

hex

0006

: Calibration expired

hex

0007

: Sensor failure

hex

0008

: Measurement not

hex

ready

0000

hex

0001

: Error

hex

0002

: Warning

hex

0003

: Notiﬁcation

hex

: Unsupported

: Noisy

: Critical failure

Table 16 Error Codes in Register 0200

(Status Code Low)

Bitmask Error Message Severity

0000

0001

0009

0010

0011

0012

0013

hex

Firmware checksum mismatch. Critical

Device settings corrupted. Critical

Infrared source temperature too high. Error

Infrared source failure. Error

Supply voltage out of range. Error

Internal voltage out of range. Error

Page 84

MGP261 User Guide M212273EN-A

Bitmask Error Message Severity

0014

0015

0016

0017

0018

0019

0020

0021

0022

0023

0024

0025

0026

0027

0028

0030

0031

hex

Sensor signal low. Error

Internal voltage out of range. Error

Sensor signal distorted. Error

CH4 measurement out of range. Error

CO2 measurement out of range. Error

H2O measurement out of range. Error

Td measurement out of range. Error

Sensor heater failure. Error

Infrared source temperature too high. Error

Internal temperature too high. Error

Temperature measurement error. Error

Supply power insucient for analog input. Error

Analog input 1 out of range. Error

Internal temperature error. Error

Supply power insucient for operation. Error

Table 17 Error Codes in Register 0202

(Status Code High)

hex

Bitmask Error Message Severity

0032

0033

0034

0035

0036

0037

0038

0039

0042

hex

Sensor signal low. Warning

Internal temperature high. Warning

Sensor signal distorted. Warning

Unexpected device restart. Warning

Calibration has expired. Warning

Infrared source temperature out of range. Warning

Page 85

Bitmask Error Message Severity

0043

0044

0048

0049

hex

Supply power insucient for analog input. Warning

Infrared source temperature out of range. Warning

Heater o. Info

Calibration is about to expire. Info

A.1.4 Device Identiﬁcation Objects

Table 18 Device Identiﬁcation Objects

Appendix A

Object ID (Decimal) Object ID

0 00

1 01

2 02

3 03

4 04

128 80

129 81

130 82

(Hexadecimal)

hex

1) Vaisala-speciﬁc device information object

Object Name Example Contents

VendorName "Vaisala"

ProductCode "MGP261 "

MajorMinorVersion Software version (for

example "1.2.3")

VendorUrl "http://

www.vaisala.com/"

ProductName "Vaisala Multigas Probe

MGP261 "

SerialNumber

Probe serial number (for example, "R0710040")

Calibration date

Date of the factory calibration

Calibration text

Information text of the factory calibration

Page 86

MGP261 User Guide M212273EN-A

Page 87

Warranty

For standard warranty terms and conditions, see www.vaisala.com/warranty. Please observe that any such warranty may not be valid in case of damage due to normal wear and tear, exceptional operating conditions, negligent handling or installation, or unauthorized modiﬁcations. Please see the applicable supply contract or Conditions of Sale for details of the warranty for each product.

Technical Support

Contact Vaisala technical support at helpdesk@vaisala.com. Provide at least the following supporting information:

• Product name, model, and serial number

• Name and location of the installation site

• Name and contact information of a technical person who can provide further information on the problem

For more information, see www.vaisala.com/support.

Recycling

Recycle all applicable material.

Follow the statutory regulations for disposing of the product and packaging.

Page 88

MGP261 User Guide M212273EN-A

Page 89

Page 90

www.vaisala.com

Vaisala MGP261 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

List of Figures

List of Tables

1. About This Document

1.1 Version Information

1.2 Related Manuals

1.3 Documentation Conventions

1.4 Trademarks

2. Product Overview

2.1 Introduction to MGP261

Basic Features and Options

2.2.1 Hazardous Area Safety

2.2.2 Measurement Parameters

2.2.3 Wet Basis and Dry Basis Measurement Output

2.2.4 Installation Type

2.2.5 Process Flow Range and Installation Type

2.2.6 Connectivity to Vaisala Insight Software

2.3 Probe Parts

2.3.1 Cable Gland Options and Lead-Throughs

2.4 Measurement Principle

2.5 Using MGP261 in Hazardous Locations

2.5.1 Guidelines for Safe Use in Hazardous Conditions

3. Installation

3.1 Overview

3.1.1 Process Flow Range and Installation Type

3.1.2 NPT 1.5" Thread Test Plug 257525SP

3.1.3 Installation Preparations

3.1.4 Installation Option: Ball Valve Installation

3.1.5 Installation Option: Flow-Through Adapter Installation

3.1.6 MGP261 Dimensions

3.1.7 Recommended Installation Position on Pipeline

3.1.8 Gas Safety During Installation

3.2 Preparing Probe for Installation

3.3 Inserting Probe into Process and Opening Connection Box

3.4 Wiring

3.4.1 Wiring Diagram

3.5 Finalizing Installation

3.6 Attaching Flow-Through Adapter to MGP261

4. Operating with Insight Software

4.1 Vaisala Insight Software

4.1.1 Basic and Advanced User Modes

4.2 Connecting to Insight Software

4.2.1 Installing the Driver for the USB Service Cable

4.3 Insight Main View

5. Modbus

6.1 Overview

6.4 Changing Units in Insight

6.5 Wet Basis and Dry Basis Measurement Parameters

7. Environmental Compensation

7.1 Overview

7.1.1 Temperature Compensation

7.1.2 Pressure Compensation

7.1.3 Compensation Mode During Calibration

7.3.2 Using Probe Measurement as Temperature Compensation

7.3.3 Using Compensation Received from External Temperature or Pressure Sensor

8. Calibration

8.1 Calibration Overview

8.1.1 Compensation Mode During Calibration

8.1.2 Flow-Through Adapter

8.2 Calibration and Adjustment with Insight PC Software

8.2.1 Example: 2-Point Adjustment with Zero Point Adjustment

8.2.2 Zero Point Adjustment

8.2.3 Calibrating and Adjusting Methane (CH4) Measurement

8.2.4 Calibrating and Adjusting Carbon Dioxide (CO2) Measurement

8.2.5 Calibrating and Adjusting Temperature Measurement

9. Maintenance

9.1 Filter Change

9.2 Removing Probe from Process

Cleaning the Probe

Sending Probe to Vaisala

10. Technical Data

Wetted Parts Material Information

10.3 MGP261 Dimensions

10.4 Flow-Through Adapter Dimensions

Appendix A. Modbus Registers

A.1 Modbus Registers