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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

Number of data bits

Number of stop bits

Modbus device address

240

More Information

‣

Configuring Modbus Communication Settings with Insight (page 39)

‣

Modbus Registers (page 68)

MGP261 User Guide

M212273EN-A

Summary of Contents for MGP261

Page 1: ...M212273EN A User Guide MGP261 Multigas Probe for Methane Carbon Dioxide and Humidity Measurement MGP261...

Page 2: ...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 comp...

Page 3: ...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 Installat...

Page 4: ...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...

Page 5: ...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 Table...

Page 6: ...agram 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...

Page 7: ...e 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 Re...

Page 8: ...MGP261 User Guide M212273EN A 6...

Page 9: ...innish Estonian Swedish Norwegian Danish M212291EN USB Service Cable 257295 Quick Guide M212283EN Flow Through Adapter 258877 Quick Guide 1 3 Documentation Conventions Warning alerts you to a serious...

Page 10: ...CAP 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...

Page 11: ...ument 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 conne...

Page 12: ...l 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...

Page 13: ...ent accuracy is not affected CAUTION 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...

Page 14: ...asurement Configure serial communication settings analog input and output parameters and scaling and environmental compensations More Information Connecting to Insight Software page 35 MGP261 User Gui...

Page 15: ...tening 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 NPT thread 7 Probe filter 8 1 5 NPT thread test p...

Page 16: ...le Gland Options and Lead Throughs 1 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...

Page 17: ...y P rot 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 electr...

Page 18: ...rmal operation 1 3 4 5 6 7 8 2 Figure 5 Measurement in the Measurement Cuvette 1 Mirror 2 Light absorbed by the measured gases 3 Sensor chips under TO5 packages see items 4 8 4 Hermetic window 5 Therm...

Page 19: ...king in the hazardous location as defined by the applicable standards CAUTION For information on the standards that apply to using MGP261 based on the classification of the device see MGP261 certifica...

Page 20: ...le 4 page 18 for screw terminal requirements Permitted supply short circuit current Ik 50 A MGP261 analog outputs must be externally powered Connect only de energized wires Never switch on the power s...

Page 21: ...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...

Page 22: ...that the installation type configuration is set correctly in Insight when changing from one installation type to another so that the calculation model in use matches the installation environment and m...

Page 23: ...ssification 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 s...

Page 24: ...nd route the cable directly to the terminal 2 Standard analog output power supply input and RS 485 communication wiring use the M20x1 5 lead throughs and route the cables to the terminals through the...

Page 25: ...ugh Adapter to MGP261 page 31 1 2 3 4 5 6 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...

Page 26: ...ure 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 s...

Page 27: ...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 WARNING To avoid compromising the l...

Page 28: ...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...

Page 29: ...ed into the port can tear the PTFE tape Only adjust the position of the probe in the installation port by tightening rotating clockwise CAUTION 2 Hold the probe by gripping the tightening nut with a w...

Page 30: ...al 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 rou...

Page 31: ...RS 485 RS 485 RSGND 4 20 mA OUTPUTS 4 20 mA Ex ia INPUT SHIELD RS 485 Iout1 Iout2 Iout3Iin 24 VDC POWER SUPPLY FOR ANALOG OUTPUTS 24 VDC POWER SUPPLY FOR PROBE GROUNDING TERMINAL GROUNDING RAIL FOR PO...

Page 32: ...l 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 wit...

Page 33: ...robe gland Never turn 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 lea...

Page 34: ...es that the mounting alignment is incorrect and must be adjusted 90 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 tig...

Page 35: ...ight 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 ada...

Page 36: ...g 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 Outp...

Page 37: ...e 257295 to connect the probe to Insight CAUTION Vin Vin D D GND RS 485 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 th...

Page 38: ...OM 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 i...

Page 39: ...al number and software version 2 Select Settings to switch between the Basic Mode and Advanced Mode user modes change the units of parameters metric non metric enter a factory code to access restricte...

Page 40: ...ation 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 D...

Page 41: ...cation bit rate Parity data bits and stop bits Response delay To configure the Modbus communication settings with Insight 1 Connect to Insight and select Configure Device Communication 2 Enter the com...

Page 42: ...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 lev...

Page 43: ...r 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 p...

Page 44: ...ent output selection is made when ordering the probe and can be configured with Vaisala Insight PC software or Modbus The following formula shows the conversion between wet basis and dry basis values...

Page 45: ...ntinuously 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 Te...

Page 46: ...tions with Modbus The Modbus implementation of MGP261 includes configuration registers for pressure and temperature compensation setpoints You can also configure the temperature and pressure compensat...

Page 47: ...ernal Measured temperature only and Off 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...

Page 48: ...ower 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 comp...

Page 49: ...ternal 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 Confi...

Page 50: ...4 Store the setting with Save MGP261 User Guide M212273EN A 48...

Page 51: ...djustment review the instructions in Removing Probe from Process page 59 WARNING The following calibration and adjustment options are available when the probe is connected to Vaisala Insight PC softwa...

Page 52: ...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...

Page 53: ...llation 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 Cha...

Page 54: ...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 poi...

Page 55: ...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 CH adjustment tab adjust the high end...

Page 56: ...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 a...

Page 57: ...ay be due to insufficient 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 u...

Page 58: ...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...

Page 59: ...atically inserted 5 Check the difference between the reference and the measured value Very large differences may be due to insufficient stabilization time or unsuitable calibration setup a If you want...

Page 60: ...r code DRW249919SP Remove the filter by rotating counter clockwise Do not touch the optical surfaces inside the measurement cuvette when replacing the filter CAUTION The probe filter is the only user...

Page 61: ...nd 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 rem...

Page 62: ...afety 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 fur...

Page 63: ...contact Vaisala technical support Do not ship the probe to Vaisala without contacting technical support Technical support will provide you with return authorization and up to date shipping instructio...

Page 64: ...5 vol Repeatability 0 5 vol at 60 vol 0 3 vol at 40 vol 0 1 vol at 10 vol Temperature dependence Compensated 0 100 vol 0 1 of reading C Compensated 0 100 vol 0 1 of reading C Compensated 0 25 vol 0 1...

Page 65: ...age 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 1 A process flow range of 2 20 m s is suitable for in situ inst...

Page 66: ...onnected external pressure sensor Table 11 Mechanical Specification Property Specification 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 bod...

Page 67: ...of the MGP261 probe are the following 1 2 3 4 5 6 1 Probe body AISI 316L EN 1 4404 X2CrNiMo17 12 2 AISI 316L 2 Sensor package window polished sapphire 3 O ring ethylene propylene rubber black 4 Measur...

Page 68: ...le gland options and lead through dimensions see Cable Gland Options and Lead Throughs page 14 32 1 26 80 5 3 17 1 5 NPT M16x1 5 M20x1 5 40 1 57 80 5 3 17 E E E E 6 0 24 14 0 56 142 5 59 179 7 05 388...

Page 69: ...t installation depth The dimensions are given in millimeters and inches 415 16 33 130 5 1 198 7 8 G 1 8 55 21 7 76 29 9 186 1 mm 7 32 Distance at correct installation depth mm in Figure 29 Flow Throug...

Page 70: ...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 Register Number Decimal Addres...

Page 71: ...thane CH4 concentration dry basis 16 bit integer ppmv 100 parts per ten thousand 259 0102hex Carbon dioxide CO2 concentration 16 bit integer ppmv 100 parts per ten thousand 260 0103hex Carbon dioxide...

Page 72: ...ressure compensation value cleared at probe reset 32 bit float hPa Range 450 1550 hPa Init default 1013 25 775 0306hex Volatile temperature compensation value cleared at probe reset 32 bit float C Ran...

Page 73: ...O 8 2 1540 0603hex Response delay 16 bit integer Valid range 0 1000 1541 0604hex Restart device Function Analog Output 1 1794 0701hex Analog output 1 measurement parameter selection When written scal...

Page 74: ...parameters Float Output parameters 0000hex CH4 wet basis 0002hex CH4 dry basis 0004hex CO2 wet basis 0006hex CO2 dry basis Minimum 0 Maximum 1000000 Output parameters 0008hex H2O wet basis 000Ahex H2O...

Page 75: ...ut parameters 0000hex CH4 wet basis 0002hex CH4 dry basis 0004hex CO2 wet basis 0006hex CO2 dry basis Minimum 0 Maximum 1000000 Output parameters 0008hex H2O wet basis 000Ahex H2O dry basis Minimum 0...

Page 76: ...meter selection When written scalings are reset Reg 0000hex CH4 wet basis 0002hex CH4 dry basis 0004hex CO2 wet basis 0006hex CO2 dry basis 0008hex H2O wet basis 000Ahex H2O dry basis 000Chex Td 000Eh...

Page 77: ...ifferent parameters Float Output parameters 0000hex CH4 wet basis 0002hex CH4 dry basis 0004hex CO2 wet basis 0006hex CO2 dry basis Minimum 0 Maximum 1000000 Output parameters 0008hex H2O wet basis 00...

Page 78: ...ers 0000hex CH4 wet basis 0002hex CH4 dry basis 0004hex CO2 wet basis 0006hex CO2 dry basis Minimum 0 Maximum 1000000 Output parameters 0008hex H2O wet basis 000Ahex H2O dry basis Minimum 0 Maximum 25...

Page 79: ...ement parameter selection When written scalings are reset Reg 0000hex CH4 wet basis 0002hex CH4 dry basis 0004hex CO2 wet basis 0006hex CO2 dry basis 0008hex H2O wet basis 000Ahex H2O dry basis 000Che...

Page 80: ...parameters Float Output parameters 0000hex CH4 wet basis 0002hex CH4 dry basis 0004hex CO2 wet basis 0006hex CO2 dry basis Minimum 0 Maximum 1000000 Output parameters 0008hex H2O wet basis 000Ahex H2O...

Page 81: ...y basis Minimum 0 Maximum 1000000 Output parameters 0008hex H2O wet basis 000Ahex H2O dry basis Minimum 0 Maximum 250000 Output parameters 000Chex Td 000Ehex Tdf Minimum 10 Maximum 60 2311 0906hex Err...

Page 82: ...4hex pressure Minimum 0 Maximum 20 000 0206hex temperature Minimum 200 Maximum 400 2567 0A06hex Input value read only Float A 1 3 Status Registers Table 15 Modbus Status Data Registers Read Only Regis...

Page 83: ...signed integer 526 020Dhex Tdf measurement status 16 bit signed integer 527 020Ehex Ts measurement status 16 bit signed integer 528 020Fhex Device status 16 bit signed integer 0000hex Critical failure...

Page 84: ...x Temperature measurement error Error 0027hex Supply power insufficient for analog input Error 0028hex Analog input 1 out of range Error 0030hex Internal temperature error Error 0031hex Supply power i...

Page 85: ...ect ID Hexadecimal Object Name Example Contents 0 00hex VendorName Vaisala 1 01hex ProductCode MGP261 2 02hex MajorMinorVersion Software version for example 1 2 3 3 03hex VendorUrl http www vaisala co...

Page 86: ...MGP261 User Guide M212273EN A 84...

Page 87: ...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 mod...

Page 88: ...MGP261 User Guide M212273EN A 86...

Page 89: ......

Page 90: ...www vaisala com...

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