Vaisala CARBOCAP GMP251 User Manual
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Vaisala CARBOCAP GMP251 User Manual

Carbon dioxide probe
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M211799EN-K
User Guide
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Vaisala CARBOCAP
Carbon Dioxide Probe
GMP251 and GMP80P

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Summary of Contents for Vaisala CARBOCAP GMP251

  • Page 1 M211799EN-K User Guide â Vaisala CARBOCAP Carbon Dioxide Probe GMP251 and GMP80P...
  • Page 2 The contents of this document are subject This product contains software developed to change without prior notice. by Vaisala or third parties. Use of the software is governed by license terms and Local rules and regulations applicable to conditions included in the applicable...

  • Page 3: Table Of Contents

    Related manuals....................12 Documentation conventions................13 Trademarks......................13 Product overview....................14 Introduction to GMP251 ..................14 Basic features and options..................15 2.2.1 Connectivity to Vaisala Insight software..........15 2.2.2 Additional features with Indigo transmitters.......... 16 2.2.3 Filter options....................17 Operating principle of CO measurement............18 Environmental compensation................
  • Page 4 Serial interface settings..................63 10.3 Physical interface....................63 10.4 Connecting with a computer................63 10.4.1 Installing driver for the USB service cable..........65 10.5 Accessing serial commands from Modbus or analog mode.......66 10.6 Enabling Modbus mode from Vaisala Industrial Protocol......66...
  • Page 5 Table of contents 10.7 Changing from digital output to analog output..........67 10.8 Serial commands....................67 10.9 Device information and status................69 10.10 Serial line output and communication.............72 10.11 Analog output...................... 80 10.12 Calibration and adjustment commands............83 10.13 Environmental compensation commands............87 10.14 Other commands....................92 Calibration and adjustment................
  • Page 6 GMP251 and GMP80P User Guide M211799EN-K 14.3 Dimensions......................120 14.3.1 GMP251 probe dimensions............... 120 14.3.2 GMP80P dimensions................... 121 14.3.3 243261SP mounting flange dimensions..........121 14.3.4 DRW244827SP calibration adapter dimensions........122 14.3.5 ASM212017SP spray shield dimensions..........122 Appendix A: Modbus reference................124 Default communication settings..............124 Function codes....................
  • Page 7 Figure 24 GMP80P probe structure................51 Figure 25 GMP80P connected to Indigo80..............52 Figure 26 Nafion tube, Vaisala item code 212807SP..........54 Figure 27 sampling from incubator using tube, with GMP80P connected to Indigo80..................56 Figure 28 sampling from incubator using pipe..........57 Figure 29 MI70 basic display..................
  • Page 8 GMP251 and GMP80P User Guide M211799EN-K Figure 44 243261SP mounting flange dimensions, cross section......121 Figure 45 DRW244827SP calibration adapter dimensions........122 Figure 46 ASM212017SP spray shield dimensions........... 122 Figure 47 GMP251 spray shield cross section............123 Figure 48 GMP251 and GMP80P materials for recycling........134...
  • Page 9 List of tables List of tables Table Document versions (English)................11 Table 2 Related manuals....................12 Table 3 Analog output overrange clipping and error limits.........22 Table 4 M12 male connector..................29 Table 5 Default Modbus serial communication settings........31 Table 6 Indigo202 Modbus registers................38 Table 7 Default Modbus serial communication settings........39 Table 8...
  • Page 10 GMP251 and GMP80P User Guide M211799EN-K Table 45 frestore command.................... 92 Table 46 pass command....................92 Table 47 reset command....................92 Table 48 GMP251 measurement performance............113 Table 49 GMP251 operating environment..............114 Table 50 GMP251 inputs and outputs................115 Table 51 GMP251 mechanical specifications.............. 115 Table 52 GMP251 compliance..................116 Table 53...

  • Page 11: About This Document

    Indigo200 transmitters' wireless configuration interface has been replaced with a USB-C interface in 2022. For instructions on configuring GMP251 probes with the earlier wireless configuration interface, see GMP251 User Guide revision M211799EN-G, available at docs.vaisala.com. Table 1 Document versions (English) Document code...

  • Page 12: Related Manuals

    GMP251 spare parts and accessories (page 119) • Status registers (page 128): added register 2052. • Removed section Patent notice. 1.2 Related manuals For the latest versions of these documents, see docs.vaisala.com. Table 2 Related manuals Document code Description M211798EN Vaisala GMP251 Carbon Dioxide Probe Quick Guide...

  • Page 13: Documentation Conventions

    Tip gives information for using the product more e ciently. 1.4 Trademarks Vaisalaâ and CARBOCAPâ are registered trademarks of Vaisala Oyj. Modbusâ is a registered trademark of Schneider Automation Inc. Nafion ™ is a trademark of The Chemours Company FC, LLC.

  • Page 14: Product Overview

    The measurement range is 0–20 %CO The probe is based on Vaisala’s patented 2nd generation CARBOCAPâ technology and equipped with Vaisala Microglow infrared light source. The probe is easy to install with a plug- in/plug-out M12 connection. Sensor performance is optimized at 5 %CO measurement.

  • Page 15: Basic Features And Options

    ‣ GMP80P specifications (page 116) 2.2.1 Connectivity to Vaisala Insight software The probe can be connected to Vaisala Insight software using a Vaisala USB cable (item code 242659) or Vaisala Indigo USB adapter (item code USB2). With the Insight software, you can: •...

  • Page 16: Additional Features With Indigo Transmitters

    • Numerical and graphical display for real-time data viewing • 3 pre-configurable analog outputs • Service port on the front for connecting to Vaisala Insight PC software or Indigo80 handheld indicator for easy configuration access Examples of additional features available with Indigo200 series transmitters: •...

  • Page 17: Filter Options

    Chapter 2 – Product overview 2.2.3 Filter options The following filter options are available for GMP251: 1. Standard membrane filter, item code ASM211650SP. Gas can enter only through the top of the filter (plastic grid covered with membrane), the sides of the filter are solid. 2.

  • Page 18: Operating Principle Of Co Measurement

    GMP251 and GMP80P User Guide M211799EN-K 2.3 Operating principle of CO measurement The Vaisala CARBOCAPâ sensor used in the probe is a silicon-based, nondispersive infrared (NDIR) sensor for measurement of gaseous carbon dioxide in air-like gases. Figure 2 Probe cuvette with mirror and...

  • Page 19: Environmental Compensation

    Compensation parameters are configured on the order form when ordering the probe, and can later be updated using Vaisala Industrial Protocol or Modbus protocol. You can also turn o any of the compensations. In that case, the probe uses the default compensation value that is mathematically neutral for the probe’s internal compensation...

  • Page 20: Temperature Compensation

    2.4.2 Pressure compensation The probe does not have on-board pressure measurement. However, a pressure reading from an external source can be used as a setpoint value for compensation using Vaisala Industrial Protocol or Modbus. If pressure compensation is turned o , the probe uses the default compensation value of 1013 hPa.

  • Page 21: Probe Startup

    Chapter 2 – Product overview • Oxygen concentration: 19.7 %O or 21 %O • Relative humidity: 50 %RH or 93 %RH If background gas compensations are turned o , the probe uses the value 0 % for both. More information ‣...

  • Page 22: Analog Output Overrange Example

    GMP251 and GMP80P User Guide M211799EN-K Table 3 Analog output overrange clipping and error limits Output voltage / current Clipping limit Error limit Default error state output 0–5 V >5 % >10 % 0–10 V >1 % >10 % 0–20 mA >5 % >10 % 23 mA...

  • Page 23: Safety

    Chapter 2 – Product overview Figure 4 Example of analog output Output voltage (V) overrange behavior Error level 0.00 Output clipping limit 5.25 5.00 In error state at >220000 ppm (200000 ppm + 10%) Clipped at 210000 ppm (200000 ppm + 5%) Regular measurement Time...

  • Page 24: Esd Protection

    2.8.1 ESD protection Electrostatic Discharge (ESD) can cause immediate or latent damage to electronic circuits. Vaisala products are adequately protected against ESD for their intended use. However, it is possible to damage the product by delivering electrostatic discharges when touching an exposed contact on the product.

  • Page 25: Installation

    The GMP251 probe itself does not require a shielded cable, but if the installation environment contains high levels of EMC noise, the disturbance may be transmitted to another connected device through an unshielded cable. Vaisala Online Store at store.vaisala.com o ers a wide selection of shielded cables in di erent lengths.

  • Page 26: Installation Accessories

    GMP251 and GMP80P User Guide M211799EN-K 3.3 Installation accessories The probe can be installed through a surface using the optional flange accessory (Vaisala product code 243261SP), or attached for example to a wall with the optional clip accessory (two-clip set, Vaisala product code 243257SP).

  • Page 27: 243257Sp Mounting Clips

    Chapter 3 – Installation 3.3.2 243257SP mounting clips The optional mounting clips (set of two clips) are used to hold the probe in place for example on a wall or other surface. Each clip base attaches to the installation surface with one screw (screw hole Ø...

  • Page 28: Asm212017Sp Spray Shield

    7. Place the top part on the base and tighten the hex screws with a 4-mm Allen key. 3.3.4 ASM212017SP spray shield The optional spray shield (Vaisala item code ASM212017SP) allows washing the probe with a pressure washer without exposing the sensor to moisture (IPX9 rating).

  • Page 29: Power Supply

    Chapter 3 – Installation The spray shield can limit or prevent the use of the probe mounting clips (243257SP). More information ‣ ASM212017SP spray shield dimensions (page 122) 3.4 Power supply The supply voltage range of the probe is 12–30 V DC with the digital output option. If the analog output is used, the supply voltage range is 12–30 V DC for voltage output and 20–...
  • Page 30 GMP251 and GMP80P User Guide M211799EN-K Pin# Function Note Cable 223263SP wire colors RS-485 + Current: Black or current 0–20 mA or 4–20 mA (default analog output output scaling) Output control Connecting pin #5 to GND (pin #3) forces the probe Gray to analog output mode.

  • Page 31: 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. For instructions on enabling the Modbus mode when you are using the probe with Vaisala Industrial Protocol, see Enabling Modbus mode from Vaisala Industrial Protocol (page 66).

  • Page 32: Vaisala Insight Pc Software

    Download Insight at vaisala.com/insight. The probe can be connected to Vaisala Insight software using a Vaisala USB cable (item code 242659) or Vaisala Indigo USB adapter (item code USB2). GMP251 probes support Insight from probe software version 1.3.0 onwards.
  • Page 33 Chapter 5 – Vaisala Insight PC software Connect the probe to Insight software in the exact order described in the following steps. 1. Open the Insight software on your computer. 2. Connect the USB cable to a free USB port on the PC.

  • Page 34: Using Gmp251 With Indigo200 Series Transmitters

    RS-485 Modbus RTU and 2 programmable relays. Note that Indigo200 transmitters switched from a WLAN configuration interface to a USB-C cable configuration interface (Vaisala Insight PC software) in 2022. For instructions on configuring GMP251 probes with the earlier WLAN interface, see the earlier GMP251 User Guide revision M211799EN-G, available at docs.vaisala.com.

  • Page 35: Connecting Probes

    Probes are inserted into the probe connector with the orientation mark and/or the Vaisala logo facing out. 1. Insert the probe into the probe connector with the orientation mark and/or the Vaisala logo on the probe body facing out. Note the orientation of the cable connector pins when inserting.

  • Page 36: Analog Output Configuration Overview

    3. If no previous configuration exists (that is, this is the first time a probe is connected to the transmitter, and no configuration has been set manually), the transmitter adapts the analog output settings of the connected Vaisala Indigo-compatible probe automatically. If a configuration that di ers from the connected probe's configuration exists in the transmitter, you must configure the new probe manually to enable the...

  • Page 37: Analog Output Configuration Example

    Chapter 6 – Using GMP251 with Indigo200 series transmitters Figure 14 Analog output type (current or voltage) selection in Insight Receiving analog output settings automatically from probe The transmitter can receive the analog output settings automatically from the connected probe in the following cases: 1.

  • Page 38: Table 6 Indigo202 Modbus Registers

    GMP251 and GMP80P User Guide M211799EN-K Table 6 Indigo202 Modbus registers Address Name Data type Probe registers (according to the connected probe's register map) 0x0000 First measurement probe address 0xDFFF Last measurement probe address Indigo registers 0xE000 Status 16-bit 0xE001 Notification and error bits 16-bit 0xE002 Connected probe...

  • Page 39: Default Communication Settings

    Chapter 6 – Using GMP251 with Indigo200 series transmitters 6.4.1 Default communication settings Figure 15 Insight PC software Communication menu view Modbus communication settings can be configured in the Insight PC software Configure device > Communication menu. Table 7 Default Modbus serial communication settings Description Default value Serial bit rate...
  • Page 40 GMP251 and GMP80P User Guide M211799EN-K Figure 16 Relay configuration options (CO2 probe example) Relay output on/o : Set to ON to enable relay output. Output parameter: The measurement that is used to control the relay. Options vary based on the type of the connected probe. Activate above: When the measurement value exceeds the value set here, the relay activates.

  • Page 41: Configuring Filtering Factor With Insight

    Chapter 6 – Using GMP251 with Indigo200 series transmitters Relay state information When one or both relays are enabled, the relay state (active/not active) is shown on the transmitter display. You can also view the status of the relays with Insight PC software. Probe connected Probe connected: GMP252 Figure 17 Relay icons on display (relay A active, relay B not active)
  • Page 42 GMP251 and GMP80P User Guide M211799EN-K The filtering factor a ects the speed at which the latest measurement is integrated into the output of the probe: a new measurement is produced approximately every two seconds. You can configure the filtering factor in Insight PC software by selecting >...

  • Page 43: Using Gmp251 With Indigo80 Handheld Indicator

    7.1 Indigo80 handheld indicator Figure 19 Indigo80 handheld indicator Vaisala Indigo80 Handheld Indicator is a portable diagnostics tool that accommodates up to two Vaisala Indigo-compatible probes or transmitters for measuring a wide range of parameters. With the indicator, you can: •...

  • Page 44: Probe Compatibility

    Indigo80 menu for changing the settings of Indigo80 (for example, date, time, and language) and viewing device information. Help menu contains tours showing the key features of Indigo80, as well as instructions for sending devices to Vaisala for calibration and maintenance.

  • Page 45: Connecting Probes To Indigo80

    7.2 Connecting probes to Indigo80 • Probe connection cable Up to two Vaisala Indigo-compatible probes or transmitters can be connected to the ports located on the bottom of Indigo80. You can connect and disconnect devices both when the indicator is powered on and when it is o .
  • Page 46 GMP251 and GMP80P User Guide M211799EN-K 2. Insert the probe connection cable in one of the ports on the bottom of the indicator. • Note the orientation of the cable connector when inserting it • Hold the connector in place while turning its locking ring clockwise – never twist the connector body! 3.

  • Page 47: Configuring Probe Features With Indigo80 Handheld Indicator

    firmware version. Accessing certain configuration options for your probe requires using the free Insight PC software, downloadable at vaisala.com/insight. 1. Connect the probe(s) to the indicator. 2. Open the indicator main menu by pressing 3.

  • Page 48: Configuring Environment Settings With Indigo80 Handheld Indicator

    GMP251 and GMP80P User Guide M211799EN-K 2. Open the indicator main menu by pressing 3. Select Devices. If you have more than one device connected to the indicator, make a further selection between the devices. 4. Select Settings > Measurement. 5.
  • Page 49 Chapter 7 – Using GMP251 with Indigo80 handheld indicator 4. Select Environment settings to access the settings for your probe. The available environment settings depend on the probe and probe firmware version. Pressure Temporary value for pressure compensation. At device restart, compensation value changes back to power-up default value.

  • Page 50: Gmp80P Portable Co2 Probe With Pump Sampling

    fixed CO transmitters. measurement data can be monitored with Vaisala Indigo80 Handheld Indicator connected to GMP80P. Indigo80 can be used for short-time logging of measurement data, as well as for calibrating and adjusting GMP80P. GMP80P is powered by Indigo80, which can supply power...

  • Page 51: Gmp80P Probe Structure

    Chapter 8 – GMP80P Portable CO2 Probe with Pump Sampling GMP80P can also be connected to a PC running Vaisala Insight PC software for Windowsâ, which can be used for field calibration, device analytics, configuration functionality, and powering of GMP80P.

  • Page 52: Configuring Gmp80P For Sampling Use

    GMP251 and GMP80P User Guide M211799EN-K For instructions on connecting GMP80P to the Indigo80 indicator, see Connecting probes to Indigo80 (page 45). Figure 25 GMP80P connected to Indigo80 Indigo80 indicator GMP80P probe Probe connection cable 272075SP connected to the rightmost M12 connector of GMP80P Note that Indigo80 identifies the GMP80P probe as GMP251: More information ‣...

  • Page 53: Gmp80P Installation And Sampling

    8.4.1 Nafion membrane tube in sampling For condensation prevention in sampling, Vaisala recommends using a Nafion membrane tube to maximize transfer of water vapor from the sample to ambient air. The Nafion material is highly selective in the removal of water.

  • Page 54: Co 2 Dilution Coe Cients For Pump Sampling Method

    Plastic tube specifications: • Inner diameter: 4 mm (approx. 5/32 in) • Outer diameter: 6 mm (approx. 15/64 in) Vaisala spare part item GMTUBESP consists of a Nafion tube and a compatible polyurethane tube for this purpose. 8.4.2 CO dilution coefficients for pump sampling method When using drying tubing (for example, Nafion) for sampling, the CO...

  • Page 55: Table

    Chapter 8 – GMP80P Portable CO2 Probe with Pump Sampling Table 8 (page 55) lists the three sampling methods of GMP80P and gives the dilution coe cients for each type of method. When you have the CO measurement value shown by Indigo80, you can use the coe cients given in the table to calculate the actual gas concentration in the sampling environment: 1.

  • Page 56: Sampling Using Plastic Tube

    • Make sure the tube is inserted fully (by approx. 5 cm (2 in)) into the measurement environment. • Vaisala recommends using a Nafion membrane tube for sampling to maximize transfer of water vapor from the sample to ambient air. For more information about the tube, see Nafion membrane tube in sampling (page...

  • Page 57: Sampling Using Steel Pipe

    Chapter 8 – GMP80P Portable CO2 Probe with Pump Sampling 2. Detach the tube from GMP80P and the incubator. 3. Shake the tube to remove any condensed water from inside. Alternatively, you can use compressed air to blow moisture out from the tube. 4.

  • Page 58: Operating With Mi70 Indicator

    GMP251 and GMP80P User Guide M211799EN-K 9. Operating with MI70 indicator 9.1 Overview of MI70 support The GMP251 probe is compatible with instruments that utilize the MI70 indicator, for example the GM70 Handheld Carbon Dioxide Meter. The MI70 indicator is a convenient service tool for viewing the measurement readings and performing calibration and 1-point adjustment.

  • Page 59: Main Menu

    2. If the MI70 indicator is on, turn it o . 3. Connect the probe to the MI70 indicator using the MI70 connection cable (Vaisala item code: CBL210472). 4. Turn on the MI70 indicator (time and date are requested at first startup). MI70 detects the probe and proceeds to show the measurement screen.

  • Page 60: Mi70 Indicator Parts

    GMP251 and GMP80P User Guide M211799EN-K 9.6 MI70 indicator parts Figure 30 MI70 indicator parts Charger socket Function key shortcut buttons . The functions change according to what you are doing with the indicator. Arrow buttons: Move up in a menu Move down in a menu Enter a sub-menu Return to previous menu level...

  • Page 61: Recording Data

    Chapter 9 – Operating with MI70 indicator 4. Select the saved display based on date and time by pressing the right arrow button. 9.8 Recording data With MI70, you can record transmitter measurement data over a certain period at chosen intervals.
  • Page 62 GMP251 and GMP80P User Guide M211799EN-K Figure 32 Probe compensation settings on MI70 screen When you turn a compensation o , the probe still shows a value for the corresponding display quantity (for example, Pcomp shows 1013.2 hPa). This is the default compensation value that is mathematically neutral for the probe’s internal compensation model.

  • Page 63: Vaisala Industrial Protocol

    10. Vaisala Industrial Protocol 10.1 Vaisala Industrial Protocol overview The RS-485 line of the probe provides an implementation of the Vaisala Industrial Protocol that can be used for service and configuration use, or for interfacing with the system to which the probe is integrated.
  • Page 64 GMP251 and GMP80P User Guide M211799EN-K 1. If you have not used the Vaisala USB cable before, install the driver before attempting to use the cable. 2. Connect the USB serial interface cable between your computer and the M12 connector of the probe.

  • Page 65: Installing Driver For The Usb Service Cable

    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. Note the COM port number, you will need it later.

  • Page 66: Accessing Serial Commands From Modbus Or Analog Mode

    #3, and cannot be switched to digital output in this wiring option. 10.6 Enabling Modbus mode from Vaisala Industrial Protocol If you need to switch from Vaisala Industrial Protocol to Modbus mode, you must configure the following settings: • Serial line operating mode • Modbus address •...

  • Page 67: Changing From Digital Output To Analog Output

    Chapter 10 – Vaisala Industrial Protocol 4. Set the serial line settings to 19200/N/8/2 with the seri command: seri 19200 N 8 2 5. Power o (disconnect) the probe or reset with the reset command. The new configuration is available at the next restart.

  • Page 68: Table 11 Advanced Serial Commands

    GMP251 and GMP80P User Guide M211799EN-K Command Description Serial line output and communication close Close connection to probe (POLL mode) form [modifier string] Show or set output format. intv [0 ... 255 Set continuous output interval for R command. s/min/h] open [address] Open connection to probe in POLL mode.

  • Page 69: Device Information And Status

    Show listing of device information even if device is in poll mode and connection has not been opened using the open command. Example: Device : GMP251 Copyright : Copyright (c) Vaisala Oyj 2015. All rights reserved. SW Name : GMP251 SW version : 1.0.0 SNUM : GMP233_5_18...

  • Page 70: Table 13 Errs Command

    GMP251 and GMP80P User Guide M211799EN-K Table 13 errs command Syntax Description errs<cr> Show active error(s). For a list of possible errors and their remedies, see Error messages (page 110). Example (no active errors): errs NO CRITICAL ERRORS NO ERRORS NO WARNINGS STATUS NORMAL Table 14 help command Syntax...

  • Page 71: Table 16 System Command

    Chapter 10 – Vaisala Industrial Protocol Syntax Description Example: snum SNUM : M0220028 Table 16 system command Syntax Description system<cr> Show probe firmware information. Example: system Device Name : GMP251 SW Name : GMP251 SW version : 1.0.0 Operating system : TSFOS1.0 Table 17 time command...

  • Page 72: Serial Line Output And Communication

    GMP251 and GMP80P User Guide M211799EN-K 10.10 Serial line output and communication Table 19 addr command Syntax Description addr<cr> Show current device address. Addresses are required for POLL mode. addr [aaa]<cr> Set new device address. aaa = address, 0–254 (default = 240) Example (shows 0 as current address, enter 5 as the new address): addr Address : 0...
  • Page 73 Chapter 10 – Vaisala Industrial Protocol Syntax Description Example (show currently used measurement format (default format shown here)): form 6.0 "CO2=" CO2 " " U3 #r #n Output example (continuous output from RUN mode): CO2= 452 ppm Example (set output format as %CO form 3.1 "CO2="...

  • Page 74: Table 22 Output Parameters For Form Command

    GMP251 and GMP80P User Guide M211799EN-K Table 22 Output parameters for form command Output parameter Abbreviation in form command Carbon dioxide in ppm Carbon dioxide in percent co2% Currently used temperature compensation value tcomp Currently used pressure compensation value pcomp o2comp Currently used oxygen concentration compensation value Currently used relative humidity compensation...

  • Page 75: Table 24 Intv Command

    Chapter 10 – Vaisala Industrial Protocol Table 24 intv command Syntax Description intv<cr> Show the output interval of the automatically repeating measurement messages (r command and run mode). intv [iii uuu]<cr> Set the output interval. • iii = interval, range 0–255 •...

  • Page 76: Table 27 S Command

    GMP251 and GMP80P User Guide M211799EN-K Syntax Description Example: CO2= 5.1 %CO2 CO2= 5.1 %CO2 CO2= 5.1 %CO2 CO2= 5.0 %CO2 CO2= 5.0 %CO2 Table 27 s command Syntax Description s<cr> Stop the continuous outputting that was started with the r command. Example: CO2= 5.1 %CO2 CO2= 5.0 %CO2...

  • Page 77: Table 30 Seri Command

    Chapter 10 – Vaisala Industrial Protocol Syntax Description send [aaa]<cr> Output a single measurement message from a device in poll mode. aaa = address of the probe, range 0–254 Example: send CO2= 5.0 %CO2 Example (target probe in POLL mode, with address 52): send 52 CO2= 5.0 %CO2...

  • Page 78: Table 31 Smode Command

    GMP251 and GMP80P User Guide M211799EN-K Syntax Description Example (set serial line to 9600 baud, even, 7 data bits, and 1 stop bit, and reset the probe to take the new settings in use): seri 9600 e 7 1 seri Com1 Baud rate : 9600 Com1 Parity : E Com1 Data bits : 7...
  • Page 79 Chapter 10 – Vaisala Industrial Protocol Syntax Description smode [mode]<cr> Set serial line start-up operating mode. New mode is taken into use when the device is reset or powered up. Available modes: stop = No automatic output. All commands available. Default mode.

  • Page 80: Analog Output

    GMP251 and GMP80P User Guide M211799EN-K 10.11 Analog output Table 32 amode command Syntax Description amode [channel]<cr> Show currently set analog output limits and error level. channel = Analog output channel • 1 = voltage output (V) • 2 = current output (mA) amode [channel lo_value hi_value Set new analog output limits and error output error_value]<cr>...

  • Page 81: Table 33 Aover Command

    Chapter 10 – Vaisala Industrial Protocol Table 33 aover command Syntax Description aover [channel<cr> Show the behavior of the analog output when the measured value is outside the scaled output range. channel = Analog output channel • 1 = voltage output (V) •...

  • Page 82: Table 34 Asel Command

    GMP251 and GMP80P User Guide M211799EN-K 2. Set analog output overrange clipping to 5 % and error limit to 10 %: aover 1 5 10 Aout 1 clipping : 5.00 % Aout 1 error limit : 10.00 % The analog output now behaves like this: •...

  • Page 83: Calibration And Adjustment Commands

    Chapter 10 – Vaisala Industrial Protocol Syntax Description asel [channel] [parameter lowlimit Set the parameter and scaling of the analog highlimit]<cr> output. channel = Analog output channel parameter = Parameter that is output on analog channel. The only parameter available is (in ppm).

  • Page 84: Table 36 Atext Command

    Table 36 atext command Syntax Description atext<cr> Show CO factory adjustment information. Example: atext Adjusted at Vaisala/Helsinki Table 37 cdate command Syntax Description cdate<cr> Show calibration date. cdate [yyyymmdd]<cr> Set a new calibration date. yyyymmdd = Year (yyyy), month (mm) and day...

  • Page 85: Table 39 Cco2 Command

    Chapter 10 – Vaisala Industrial Protocol Syntax Description Example (set a new information text): ctext 0% 5% by NN Calibrated at 0% 5% by NN Table 39 cco2 command Syntax Description cco2<cr> Show current user adjustment status. cco2 -lo [co2]<cr> Perform a 1-point (only either low or high concentration) or 2-point (both low and high cco2 -hi [co2]<cr>...
  • Page 86 GMP251 and GMP80P User Guide M211799EN-K Syntax Description Example (perform a 1-point calibration): 1. Let the probe stabilize in the desired CO concentration (here: 5 %CO (=50000 ppm)). 2. Enter the calibration commands: pass 1300 cco2 -hi 50000 cco2 -save 3.

  • Page 87: Environmental Compensation Commands

    Chapter 10 – Vaisala Industrial Protocol 10.13 Environmental compensation commands To apply an accurate relative humidity compensation, the temperature and pressure compensation configurations must also match your measurement environment. See the rhcmode, tcmode and pcmode commands for instructions on enabling compensation configuration, and env command for instructions on setting a compensation value.
  • Page 88 GMP251 and GMP80P User Guide M211799EN-K Syntax Description env [xtemp | xpres | xoxy | xhum] Set new compensation values and store them in [value]<cr> RAM. RAM: • Volatile memory that loses the values when probe is reset, and where values are loaded from non-volatile (EEPROM) memory at power-on.

  • Page 89: Table 41 O2Cmode Command

    Chapter 10 – Vaisala Industrial Protocol Syntax Description Example (set temperature compensation to setpoint mode, and change temperature setpoint value to 37.2 in RAM): pass 1300 tcmode on T COMP MODE : ON env xtemp 37.2 In eeprom: Temperature (C) : 25.00 Pressure (hPa) : 1013.00...

  • Page 90: Table 42 Pcmode Command

    GMP251 and GMP80P User Guide M211799EN-K Table 42 pcmode command Syntax Description pcmode<cr> Check current pressure compensation mode. Possible modes: • on = Compensation enabled using setpoint value. • off = Compensation disabled, default (neutral) value used: see Environmental compensation (page 19).

  • Page 91: Table 44 Tcmode Command

    Chapter 10 – Vaisala Industrial Protocol Syntax Description Example (check relative humidity compensation mode; relative humidity compensation is disabled, a neutral value is used): pass 1300 rhcmode RH COMP MODE : OFF Example (enable temperature, pressure and relative humidity compensation using setpoint values):...

  • Page 92: Other Commands

    GMP251 and GMP80P User Guide M211799EN-K 10.14 Other commands Table 45 frestore command Syntax Description frestore<cr> Restore the probe to its factory configuration. All user settings and user calibration parameters will be lost. After using the frestore command, reset the probe using the reset command.

  • Page 93: Calibration And Adjustment

    There are two easy ways to use a calibration gas as a reference: • You can supply the gas to the probe using the calibration adapter accessory (Vaisala item code DRW244827SP). Gas flow should be in the range 0.5 – 1.1 l/min, recommendation is 1 l/min.

  • Page 94: Effect Of Environmental Compensations

    Indigo80 handheld indicator and a reference probe. If you want to integrate the functionality into a control system, the Modbus interface and the Vaisala industrial protocol are recommended.
  • Page 95 The MI70 handheld indicator supports 1-point adjustment, either using a calibration gas or using a reference instrument that is connected to the MI70. Vaisala Industrial Protocol Vaisala industrial protocol supports 1-point and 2-point adjustment with the cco2 command. Configuration of the environmental compensation settings can be done using serial line commands.

  • Page 96: Drw244827Sp Calibration Adapter

    GMP251 and GMP80P User Guide M211799EN-K 11.5 DRW244827SP calibration adapter The optional calibration adapter accessory can be used to feed a reference gas to the probe through a gas port when calibrating. Gas flow should be in the range 0.5–1.1 l/min, recommendation is 1 l/min.

  • Page 97: Overview Of Calibration With Indigo200 Using Insight

    Chapter 11 – Calibration and adjustment 11.6 Overview of calibration with Indigo200 using Insight Figure 35 Insight calibration menu main view (CO probe) The calibration menu in the Insight PC software contains options for calibrating and adjusting the measurement of the probe you have connected to the transmitter, and testing and adjusting the analog output channels of the transmitter.

  • Page 98: Environmental Compensation

    GMP251 and GMP80P User Guide M211799EN-K Starting calibration To open the calibration menu, select to access Insight main menu. In the main menu, select Calibrate. Figure 36 Insight Calibrate menu selection Restoring factory adjustment Before adjusting the probe measurement, you can remove any possible earlier adjustments with the Restore factory adjustment selection, if needed.

  • Page 99: Co 2 Probe Adjustment Example

    Chapter 11 – Calibration and adjustment The selection of environmental compensations available in the Indigo transmitter configuration menus depends on the features and configuration of the connected probe. If the probe you have connected to the transmitter supports environmental compensations, the configuration options are shown in the Configure device menu accessible from the Insight PC software main view.

  • Page 100: Calibration And Adjustment With Indigo80 Handheld Indicator

    GMP251 and GMP80P User Guide M211799EN-K 6. When the measurement has stabilized, click the Reference value, point 1 text box and enter the CO level of calibration point 1. Press ENTER or click outside the text box when done. 7. Check that the measured value for point 1 is automatically inserted. 8.

  • Page 101: Performing Guided Calibration With Indigo80

    Chapter 11 – Calibration and adjustment 11.7.1 Performing guided calibration with Indigo80 • Probe connection cable • Calibration reference (for example, a reference gas with a known concentration, or a recently calibrated Indigo80-compatible probe In guided calibration, the indicator guides you through the calibration process step by step. At the end, you can also adjust the measurement, if needed.

  • Page 102: Performing Manual Adjustment With Indigo80 Using Predetermined Values

    GMP251 and GMP80P User Guide M211799EN-K 11.7.2 Performing manual adjustment with Indigo80 using predetermined values • Probe connection cable This section tells you how to use the Indigo80 indicator to adjust the probe's measurement in 1 or 2 points. Use the Manual adjustment mode to enter predetermined calibration data (for example, from a calibration certificate) to adjust your probe to correct the observed errors.

  • Page 103: Restoring Factory Adjustment With Indigo80 Handheld Indicator

    Chapter 11 – Calibration and adjustment 11.7.3 Restoring factory adjustment with Indigo80 handheld indicator • Probe connection cable If needed, you can restore the factory adjustment for your probe's output parameters using the Indigo80 handheld indicator. Always restore factory adjustment before entering a new adjustment. This prevents any possible earlier adjustments having an e ect on the new adjustment you make.

  • Page 104: 1-Point Adjustment With An Mi70-Compatible Reference Probe

    GMP251 and GMP80P User Guide M211799EN-K When two probes are connected to the MI70 indicator, MI70 uses Roman numerals “I” and “II” to indicate which port the parameter or function in question is connected to. 11.8.1 1-point adjustment with an MI70-compatible reference probe 1.

  • Page 105: 1-Point Adjustment With A Reference Gas

    1. Connect the GMP251 to Port I of the MI70 indicator. 2. Feed a calibration gas to the GMP251 using the calibration adapter accessory (Vaisala item code: DRW244827SP). If you are using ambient air as the calibration gas, you must have a reference meter in the same environment to verify the CO concentration.
  • Page 106 GMP251 and GMP80P User Guide M211799EN-K 4. Start the adjustment sequence from Main menu > Functions > Adjustments. 5. MI70 notifies you that automatic power o is disabled during adjustment mode, press OK to acknowledge. 6. Select the CO parameter when prompted. 7.
  • Page 107 Chapter 11 – Calibration and adjustment 10. You will be prompted if you really want to adjust. Select Yes. 11. You are now in the 1-point adjustment screen. Allow the measurement to stabilize and press Ready. 12. Enter the CO concentration of the reference gas and press OK.

  • Page 108: Maintenance

    GMP251 and GMP80P User Guide M211799EN-K 12. Maintenance 12.1 Cleaning GMP251 and GMP80P You can clean the probe body by wiping it with a moist cloth. Standard cleaning agents can be used. When cleaning, follow these precautions: • Do not immerse the probe in liquid to clean it. •...

  • Page 109: Changing The Gmp251 Filter

    Chapter 12 – Maintenance 2. Loosen the locking ring of the cable connector on the bottom of GMP251 and disconnect the cable from the probe. 3. Grip the GMP80P body with both hands and push the GMP251 probe out using your thumbs.

  • Page 110: Troubleshooting

    GMP251 and GMP80P User Guide M211799EN-K 13. Troubleshooting 13.1 Problem situations with GMP251 Problem Possible cause Remedy Analog output reading is Analog output is in error state. Remove the cause of the error unchanging and appears state and the analog output will incorrect.
  • Page 111 Chapter 13 – Troubleshooting • Status indicates a known state of the unit. In case of constant error, contact Vaisala. Error message and code Description Recommended action Critical errors Program memory crc critical Program memory is corrupted. Fatal error, contact Vaisala error [1] technical support.

  • Page 112: Analog Output Error State

    GMP251 and GMP80P User Guide M211799EN-K Error message and code Description Recommended action Cut warning [23] EMC interference error limit Check for EMC interference approaching. sources. Unexpected restart Transmitter is reset by Continue normally. detected [24] watchdog process. Status messages adjustment mode Complete the CO adjustment.

  • Page 113: Technical Data

    Chapter 14 – Technical data 14. Technical data 14.1 Product specifications 14.1.1 GMP251 specifications Table 48 GMP251 measurement performance Property Description/value Measurement range 0–20 %CO Accuracy At 5 %CO ±0.1 %CO At 0–8 %CO ±0.2 %CO At 8–20 %CO ±0.4 %CO Calibration uncertainty At 5 %CO ±0.07 %CO...

  • Page 114: Table 49 Gmp251 Operating Environment

    GMP251 and GMP80P User Guide M211799EN-K Property Description/value With compensation, 0–20 %CO , 0–100 %RH ±0.7 % of reading (at +25 °C (+77 °F)) Without compensation (typical) +0.05 % of reading / %RH dependence With compensation, 0–20 %CO , 0–90 %O ±0.6 % of reading (at +25 °C (+77 °F)) Without compensation (typical) -0.08 % of reading / %O...

  • Page 115: Table 50 Gmp251 Inputs And Outputs

    • 0–5/10 V (scalable), min. load 10 kΩ • 0/4–20 mA (scalable), max. load 500 Ω Digital output Over RS-485: • Modbus • Vaisala Industrial Protocol Operating voltage With digital output in use 12–30 V DC With voltage output in use 12–30 V DC...

  • Page 116: Gmp80P Specifications

    GMP251 and GMP80P User Guide M211799EN-K Property Description/value Probe diameter 25 mm (0.98 in) Probe length 96 mm (3.78 in) Table 52 GMP251 compliance Property Description/Value EU directives and regulations EMC Directive (2014/30/EU) RoHS Directive (2011/65/EU) as amended by 2015/863 Electromagnetic compatibility (EMC) EN 61326‑1, basic electromagnetic environment EMC emissions CISPR 32 / EN 55032, Class B...

  • Page 117: Table 54 Gmp80P Operating Environment

    Chapter 14 – Technical data Property Description/Value Response time (T90) < 1 min Other Sampling frequency At 25 °C (77 °F) and 1013 hPa (incl. repeatability and non-linearity). Table 54 GMP80P operating environment Property Description/Value Operating environment Indoor use Operating temperature +15 …...

  • Page 118: Table 58 Gmp80P Compliance

    ICES‑3 / NMB‑3 (Class B) Compliance marks CE, China RoHS, RCM Table 59 GMP80P manufacturer contact information Property Description/Value Made in Finland by Vaisala Oyj, Vanha Nurmijärventie 21, FI-01670, Vantaa UK address Vaisala Ltd, 6230 Bishops Court, Solihull Parkway, Birmingham Business Park, Birmingham B37 7YB...

  • Page 119: Spare Parts And Accessories

    Flat cable for GMP250 probes, M12 5-pin CBL210493SP USB2 Indigo USB adapter Probe mounting clips (2 pcs) 243257SP Probe mounting flange 243261SP Probe holder assembly ASM213582 Flow-through adapter with gas ports ASM211697SP Calibration adapter DRW244827SP Spray shield ASM212017SP Vaisala Insight software for Windows available at vaisala.com/insight...

  • Page 120: Gmp80P Spare Parts And Accessories

    ASM214318SP Indigo USB adapter USB2 See the GMP251 Order Form at docs.vaisala.com for more information. Consists of a 0.6-m (1 ft 12 in) Nafion tube and a 1.5-m (4 ft 11 in) polyurethane tube. 14.3 Dimensions 14.3.1 GMP251 probe dimensions 96 [3.78], Ø...

  • Page 121: Gmp80P Dimensions

    Chapter 14 – Technical data 14.3.2 GMP80P dimensions Ø 7.5 [0.295] mm [in] mm [in] Figure 42 GMP80P dimensions, front and side 14.3.3 243261SP mounting flange dimensions 36 [1.41] Ø 60 [2.36] Ø 36 [1.41] Ø 25.6 [1.008] Ø 28.5 [1.12] mm [in] Ø...

  • Page 122: Drw244827Sp Calibration Adapter Dimensions

    GMP251 and GMP80P User Guide M211799EN-K 14.3.4 DRW244827SP calibration adapter dimensions Figure 45 DRW244827SP calibration adapter dimensions 25.6 14.3.5 ASM212017SP spray shield dimensions 72 [2.83] Ø 40 [1.57] Shield + GMP251: 113 [4.45] mm [in] Shield + GMP252: 146 [5.75] Figure 46 ASM212017SP spray shield dimensions...
  • Page 123 Chapter 14 – Technical data Figure 47 GMP251 spray shield cross section...

  • Page 124: Appendix A. Modbus Reference

    GMP251 and GMP80P User Guide M211799EN-K Appendix A. Modbus reference A.1 Default communication settings Table 62 Default Modbus serial communication settings Property Description/Value Serial bit rate 19200 Parity Number of data bits Number of stop bits Modbus device address A.2 Function codes Table 63 Modbus function codes Function code (decimal) Function code (hexadecimal)

  • Page 125: 16-Bit Integer Format

    Appendix A – Modbus reference Despite the specification, some Modbus masters may expect a "big-endian" word order (most significant word first). In such case, you must select "word-swapped" floating point format in your Modbus master for the Modbus registers of the device. A complete 32-bit floating point or 32-bit integer value should be read and written in a single Modbus transaction.

  • Page 126: Measurement Data Registers

    GMP251 and GMP80P User Guide M211799EN-K A.4.1 Measurement data registers Table 65 Modbus measurement data registers (read-only) Register Address Description Data format Unit number 0x0000 Measured CO value 32-bit float 0x0002 Compensation T 32-bit float °C 0x0004 Measured T 32-bit float °C 0x0100 Measured CO...
  • Page 127 Appendix A – Modbus reference Register Address Description Data Unit / Valid range number format 0x0206 Power-up value for 32-bit float oxygen compensation 0–100 %O (Init/default: 0) 0x0208 Volatile (value cleared 32-bit float 500–1100 hPa at probe reset) pressure (Init copied from power-up value) compensation 0x020A Volatile (value cleared 32-bit float...

  • Page 128: Status Registers

    GMP251 and GMP80P User Guide M211799EN-K Register Address Description Data Unit / Valid range number format 0x0305 Temperature enum 0 = O compensation mode 1 = Given 2 = Measured (default: 2 (Measured)) 0x0306 Humidity compensation enum 0 = O mode 1 = On (default: 0 (O ))

  • Page 129: Device Identification Objects

    CalibrationDate Calibration date in YYYY-MM-DD format. Empty string if not set/valid. 0x82 "Vaisala/HEL" CalibrationText Calibration information text. Empty string if not set/valid. Vaisala-specific device information. A.6 Exception responses Table 69 Modbus exception responses Code Name Reason ILLEGAL FUNCTION Unsupported function code...

  • Page 130: Modbus Communication Examples

    GMP251 and GMP80P User Guide M211799EN-K Accessing unavailable (temporarily missing) measurement data does not generate a Modbus exception. “Unavailable” value (a quiet NaN for floating point data or 0x8000 for integer data) is returned instead. An exception is generated only for any access outside the applicable register ranges.
  • Page 131 Appendix A – Modbus reference Communication description Data format Two 16-bit Modbus registers interpreted as IEEE 754 binary32 floating point value, least significant word first. Returned value 43E8D47Ah, which is binary32 representation of 465.65997 (ppm). Writing volatile compensation pressure value Request Response Bytes on the line...

  • Page 132: Filtering Factor

    GMP251 and GMP80P User Guide M211799EN-K Communication description Register address 521 (1-based Modbus documentation format) = 0x0208 (0-based format used in actual communication). Data format Two 16-bit Modbus registers interpreted as IEEE 754 binary32 floating point value, least significant word first. Value to write 1013.25 (hPa), in binary32 format 0x447D5000.

  • Page 133: Appendix B. Recycling Instructions

    Appendix B – Recycling instructions Appendix B. Recycling instructions These recycling instructions guide you on the end-of-life treatment of this Vaisala product. As waste regulations and infrastructure vary in each country, these instructions only indicate the di erent components to be separated and common ways to handle them. Always follow local requirements when disposing of the product.

  • Page 134: Table 70 Materials For Recycling

    GMP251 and GMP80P User Guide M211799EN-K Figure 48 GMP251 and GMP80P materials for recycling Table 70 Materials for recycling Recycling Part Material Electrical and electronic waste 9, 10, 13, 14 Various Metal waste 2, 6 Stainless steel Aluminum Brass, nickel, copper Brass, nickel...
  • Page 135 Appendix B – Recycling instructions Recycling Part Material Plastic waste PMMA 7, 8 Silicone PBT, PTFE Other 1, 4, 15, 16 Various...

  • Page 137: Maintenance And Calibration Services

    Maintenance and calibration services Vaisala o ers comprehensive customer care throughout the life cycle of our measurement instruments and systems. Our factory services are provided worldwide with fast deliveries. For more information, see vaisala.com/calibration. • Vaisala Online Store at store.vaisala.com is available for most countries.
  • Page 140 vaisala.com...

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