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Vaisala GMP252 User Manual

Carbocap carbon dioxide probe
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Summary of Contents for Vaisala GMP252

  • Page 1 M211897EN-D User Guide â Vaisala CARBOCAP Carbon Dioxide Probe GMP252...
  • Page 2 This product contains software developed by The contents of this manual are subject to change Vaisala or third parties. Use of the software is without prior notice. governed by license terms and conditions Local rules and regulations may vary and they...

  • Page 3: Table Of Contents

    4.4.1 Installing the Driver for the USB Service Cable........29 Accessing Serial Commands from Modbus or Analog Mode...... 30 Enabling Modbus Mode from Vaisala Industrial Protocol......30 Changing From Digital Output to Analog Output......... 31 Serial Commands....................31 Device Information and Status................ 33 4.10...
  • Page 4 Environmental Compensation Commands............ 52 4.14 Other Commands....................58 Modbus........................59 Vaisala Insight Software................61 Connecting to Insight Software................61 Using GMP252 with Indigo Transmitters..........63 Indigo Overview....................63 7.1.1 Wireless Configuration Interface Overview..........64 Taking a Probe in Use with Indigo..............65 7.2.1 Checking Indigo Support in Probe............66 Attaching Probes and Cables................
  • Page 5 10.4 Indigo Wireless Connection Troubleshooting..........101 Technical Data....................103 11.1 GMP252 Specifications................... 103 11.2 Spare Parts and Accessories................106 11.3 GMP252 Probe Dimensions................107 11.4 243261SP Mounting Flange Dimensions............107 11.5 DRW244827SP Calibration Adapter Dimensions........108 11.6 ASM212017SP Spray Shield Dimensions............109 11.7 DTR250 Radiation Shield Dimensions............110 11.8...
  • Page 6 Probe with ASM212017SP Spray Shield ............. 23 Figure 10 GMP252 in DTR250 Radiation Shield ............24 Figure 11 GMP252 Installation with DTR250A Pole Mounting Kit ......24 Figure 12 Example of analog output overrange behavior........48 Figure 13 Connecting Probe to Insight................61 Figure 14 GMP252 Attached to Indigo Transmitter...........
  • Page 7 List of Tables List of Tables Table Document Versions....................7 Table 2 Related Manuals....................7 Table 3 Applicable Patents....................9 Table 4 Analog Output Overrange Clipping and Error Limits........18 Table 5 M12 Male Connector................... 25 Table 6 Default Serial Interface Settings..............27 Table 7 Basic Serial Commands..................32 Table 8...
  • Page 8 GMP252 User Guide M211897EN-D Table 52 Modbus Measurement Data Registers (Read-Only).........113 Table 53 Modbus Configuration Data Registers (Writable)........114 Table 54 Modbus Status Registers (Read-Only)............116 Table 55 Device Identification Objects................117...

  • Page 9: About This Document

    Document Code Date Description M211897EN-D March 2018 • Added information about using the probe with Vaisala Insight PC software. • PuTTy terminal settings instructions updated. • Calibration uncertainty specification updated. • DTR250A radiation shield pole mounting kit added. • Added recommendation to disable MI70 indicator's automatic power off feature when used with GMP252.

  • Page 10: Documentation Conventions

    Note highlights important information on using the product. Tip gives information for using the product more efficiently. 1.4 Trademarks Vaisalaâ and CARBOCAPâ are registered trademarks of Vaisala Oyj. Windowsâ is either a registered trademark or trademark of Microsoft Corporation in the United States and other countries.

  • Page 11: Patent Notice

    Chapter 1 – About This Document 1.5 Patent Notice This product is protected by the following patents and their corresponding national rights: Table 3 Applicable Patents Patent Issued By Patent Number United States Patent and Trademark Office US 5,827,438 US 6,177,673 European Patent Office EP0776023 EP0922972 German Patent and Trade Mark Office...
  • Page 12 GMP252 User Guide M211897EN-D...

  • Page 13: Product Overview

    The probe is based on Vaisala’s patented 2nd generation CARBOCAPâ technology and equipped with Vaisala's Microglow infrared light source. The probe is easy to install with a plug-in/plug-out M12 connection. GMP252 is able to compensate for temperature, pressure and background gas. For temperature compensation purposes, the probe includes an internal temperature sensor that allows measurement compensation according to ambient temperature.

  • Page 14: Basic Features And Options

    ‣ Overview of MI70 Support (page 85) 2.2.1 Connectivity to Vaisala Insight Software The probe can be connected to Vaisala Insight software using a Vaisala USB cable (no. 242659). With the Insight software, you can: • Calibrate and adjust the measurement.

  • Page 15: Additional Features With Indigo Transmitters

    2.2.3 Filter Options Figure 2 ASM212011SP Flow-through Adapter The GMP252 flow-through adapter (order code ASM212011SP) has two gas ports for controlled gas feed (port outer diameter 4.6 mm, port hole inner diameter 2 mm, suitable for tubing with 4 mm inner diameter). For information on ordering accessories and spare...

  • Page 16: Operating Principle Of Co Measurement

    GMP252 User Guide M211897EN-D 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 3 Probe Cuvette with Mirror and Sensor...

  • Page 17: Environmental Compensation

    Chapter 2 – Product Overview Figure 4 CO Measurement in the Measurement Cuvette Gold-plated mirror Light absorbed by CO in the measured Hermetic window Fabry-Pérot interferometer Light source (Microglow) Hermetic window Thermopile detector 2.4 Environmental Compensation When necessary, various environmental compensations can be applied to improve the CO measurement accuracy of the probe.

  • Page 18: Temperature 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 off 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 19: Pressure 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 off, the probe uses the default compensation value of 1013 hPa.

  • Page 20: Analog Output Overrange Behavior

    GMP252 User Guide M211897EN-D More Information ‣ Configuration Registers (page 114) ‣ Configuring Filtering Factor with Indigo (page 77) 2.7 Analog Output Overrange Behavior The analog output of the probe has a defined behavior when the values measured by the probe are outside the scaled analog output range. At first, the output is clipped when the measurement exceeds a set limit (the measurement continues, but the output does not change from the clipped value).

  • Page 21: Safety

    Chapter 2 – Product Overview • When the measured CO rises above 2000 ppmCO , the output rises above 5 V. • The output keeps rising until the measurement is 2100 ppmCO , at which point the probe outputs 5.25 V. •...

  • Page 22: 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 23: Installation

    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 24: 243261Sp Mounting Flange

    GMP252 User Guide M211897EN-D More Information ‣ Spare Parts and Accessories (page 106) 3.3.1 243261SP Mounting Flange The optional flange accessory is used to install the probe body through a wall or other surface. Figure 7 Probe with 243261SP Mounting Flange 4 Phillips head screws (included) Mounting flange (diameter 60 mm) with four Ø...

  • Page 25: 243257Sp Mounting Clips

    Ø 4.2 mm Figure 8 Probe in 243257SP Mounting Clips 3.3.3 ASM212017SP Spray Shield The optional spray shield (Vaisala order code: ASM212017SP) allows washing the probe with a pressure washer without exposing the sensor to moisture (IP9X rating). O-ring Remove lid to clean Figure 9 Probe with ASM212017SP Spray Shield...

  • Page 26: Dtr250 Radiation Shield

    GMP252 User Guide M211897EN-D 3.3.4 DTR250 Radiation Shield The optional DTR250 radiation shield (Vaisala order code: DTR250) protects the probe from solar radiation and precipitation in outdoor installations. Figure 10 GMP252 in DTR250 Radiation Shield Mounting plate ø 2 x 7 mm holes...

  • Page 27: Power Supply

    12 ... 30 VDC for voltage output and 20 ... 30 VDC for current output. Typical power consumption is less than 0.4 W in continuous operation, and the maximum is 0.5 W. More Information ‣ GMP252 Specifications (page 103) 3.5 Wiring Table 5 M12 Male Connector Pin# Function...
  • Page 28 GMP252 User Guide M211897EN-D...

  • Page 29: Vaisala Industrial Protocol

    4. Vaisala Industrial Protocol 4.1 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. The protocol is a plaintext protocol suitable for use both by human operators and automated systems.
  • Page 30 Windows and a USB computer connection cable. Connecting with a computer allows you to configure and troubleshoot your probe using serial line commands. 1. If you have not used the Vaisala USB cable before, install the driver before attempting to use the cable.

  • Page 31: Installing The 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 32: Accessing Serial Commands From Modbus Or Analog Mode

    ‣ Enabling Modbus Mode from Vaisala Industrial Protocol (page 30) 4.6 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 •...

  • Page 33: Changing From Digital Output To Analog Output

    Chapter 4 – Vaisala Industrial Protocol 2. Set the serial mode to Modbus with the smode command: smode modbus 3. Set the Modbus address to 240 with the addr command: addr 240 4. Set the serial line settings to 19200/N/8/2 with the seri command: seri 19200 N 8 2 5.

  • Page 34: Table 7 Basic Serial Commands

    GMP252 User Guide M211897EN-D Table 7 (page 32) lists the basic serial commands that are available by default. To access advanced serial commands (listed in Table 8 (page 33)), enter the command pass 1300. Table 7 Basic Serial Commands Command Description Device information and status Show probe information.

  • Page 35: Device Information And Status

    Chapter 4 – Vaisala Industrial Protocol Table 8 Advanced Serial Commands Command Description Serial line output and communication addr [0 … 254] Show or set probe address. Analog output amode Show or set analog output mode (analog output limits and error level).

  • Page 36: Table 10 Errs Command

    GMP252 User Guide M211897EN-D Syntax Description Example: Device : GMP25x Copyright : Copyright (c) Vaisala Oyj 2016. All rights reserved. SW Name : GMP25x SW version : 1.0.0 SNUM : GMP233_5_18 SSNUM : S1234567 CBNUM : c1234567 Calibrated : 20160504 @ Vaisala/R&D...

  • Page 37: Table 12 Snum Command

    Chapter 4 – Vaisala Industrial Protocol Syntax Description Example (showing a list of the basic commands): help ADATE ADDR ATEXT CLOSE ERRS FORM HELP INTV PASS ESET SDELAY SEND SENDX SERI SMODE SNUM SYSTEM UNIQID TIME VERS Table 12 Snum command...

  • Page 38: Serial Line Output And Communication

    GMP252 User Guide M211897EN-D Syntax Description Example: system Device Name : GMP25x SW Name : GMP25x SW version : 1.0.0 Operating system : TSFOS1.0 Table 14 Time Command Syntax Description time<cr> Show how long the probe has been in operation since the last startup or reset.

  • Page 39: Table 17 Close Command

    Chapter 4 – Vaisala Industrial Protocol Syntax Description 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 addr 5 Address : 5 Table 17 Close Command...
  • Page 40 GMP252 User Guide M211897EN-D 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 41: Table 19 Output Parameters For Form Command

    Chapter 4 – Vaisala Industrial Protocol Syntax Description Example (set output format as CO ppm, with start of text (ASCII character 002) and end of text (003) ASCII codes, and without line feed and carriage return at the end): form #002 6.0 "CO2=" CO2 " " U3 #003...

  • Page 42: Table 21 Intv Command

    GMP252 User Guide M211897EN-D Modifier Description Name of the measurement unit using x number of characters. For example, u3 shows the name of the measurement unit with three characters. Modulus-65536 checksum of message sent so far, ASCII encoded hexadecimal notation.

  • Page 43: Table 23 R Command

    Chapter 4 – Vaisala Industrial Protocol Syntax Description Example (target probe in POLL mode, with address 52): open 52 GMP25x: 52 Opened for operator commands Table 23 R Command Syntax Description r<cr> Start the continuous outputting of measurement values as an ASCII text string to the serial line. The...

  • Page 44: Table 25 Sdelay Command

    GMP252 User Guide M211897EN-D Table 25 Sdelay Command Syntax Description sdelay<cr> Show serial line transmission delay (1 … 255). 1 unit = 4 milliseconds (for example, 5 = 0.020 second transmission delay). sdelay [delay]<cr> Set a new serial line transmission delay.

  • Page 45: Table 28 Smode Command

    Chapter 4 – Vaisala Industrial Protocol Syntax Description seri [b p d s]<cr> Set new serial line settings. The new settings will be taken into use when the probe is reset or powered up. b = baud rate (9600, 19200, or 38400) p = parity •...

  • Page 46: Analog Output

    485 buses where multiple probes can share the same line. modbus = Serial line communication uses the Modbus protocol. Serial line commands (Vaisala Industrial Protocol) are not accessible in the Modbus mode. analog = Switches the probe from digital output to analog output (active after probe reset).

  • Page 47: Table 30 Aover Command

    Chapter 4 – Vaisala Industrial Protocol Syntax Description amode [channel lo_value hi_value Set new analog output limits and error output value. error_value]<cr> channel = Analog output channel • 1 = voltage output (V) • 2 = current output (mA) lo_value = Low limit of the channel.
  • Page 48 GMP252 User Guide M211897EN-D Syntax Description aover [channel clipping error_ Set the behavior of the analog output when the limit]<cr> measured value is outside the scaled output range. channel = Analog output channel • 1 = voltage output (V) • 2 = current output (mA) clipping = Output margin (%) at which the output is clipped.
  • Page 49 Chapter 4 – Vaisala Industrial Protocol Syntax Description Example (for channel 1): 1. View currently set analog output scaling (asel command), limits and error level (amode command), and overrange behavior (aover command): pass 1300 asel 1 Aout 1 quantity : CO2(0 ... 2000) amode 1 Aout 1 range (V) : 0.00 ...

  • Page 50: Figure 12 Example Of Analog Output Overrange Behavior

    GMP252 User Guide M211897EN-D Syntax Description Output voltage (V) Error level 0.00 Output clipping limit 5.25 5.00 In error state at >2200 ppm (2000 ppm + 10%) Clipped at 2100 ppm (2000 ppm + 5%) Regular measurement Time Figure 12 Example of analog output overrange behavior The example shown above uses output scaled to 0 ...

  • Page 51: Calibration And Adjustment

    Chapter 4 – Vaisala Industrial Protocol Syntax Description Example (for channel 1, show the currently set analog output parameter and scaling): pass 1300 asel 1 Aout 1 quantity : CO2(0 ... 10000 ppm) Example (for channel 1, set scaling to 0 ... 4000 ppmCO...

  • Page 52: Table 34 Cdate Command

    GMP252 User Guide M211897EN-D Table 34 Cdate Command Syntax Description cdate<cr> Show calibration date. cdate [yyyymmdd]<cr> Set a new calibration date. yyyymmdd = Year (yyyy), month (mm) and day (dd) of calibration Example: pass 1300 cdate Calibration date : 20150220 Example (set a new calibration date to June 30, 2015):...
  • Page 53 Chapter 4 – Vaisala Industrial Protocol Syntax Description 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> concentrations) calibration and adjustment. -lo = Adjustment at low concentration (under 1000...

  • Page 54: Environmental Compensation Commands

    GMP252 User Guide M211897EN-D Syntax Description Example (perform 2-point calibration): 1. Let the probe stabilize in the desired low CO concentration (here: 200 ppmCO 2. Enter the calibration commands: pass 1300 cco2 -lo 200 cco2 -save 3. Let the probe stabilize in the desired high CO concentration (here: 3000 ppmCO 4.

  • Page 55: Table 37 Env Command

    Chapter 4 – Vaisala Industrial Protocol Table 37 Env Command Syntax Description env<cr> Show current compensation values. Before using this command, you must enable environmental compensation using the following commands: • o2cmode [on] • pcmode [on] • rhcmode [on] • tcmode [on | measured]...
  • Page 56 GMP252 User Guide M211897EN-D Syntax Description env [xtemp | xpres | xoxy | xhum] Set new compensation values and store them in RAM. [value]<cr> RAM: n Volatile memory that loses the values when probe is reset, and where values are loaded from non- volatile memory at startup.

  • Page 57: Table 38 O2Cmode Command

    Chapter 4 – Vaisala Industrial Protocol Syntax Description Example (set temperature compensation to setpoint mode, and change temperature setpoint value to 5.00 °C in RAM): pass 1300 tcmode on T COMP MODE : ON env xtemp 5.00 In eeprom: Temperature (C) : 8.00 Pressure (hPa) : 1013.00...

  • Page 58: Table 39 Pcmode Command

    GMP252 User Guide M211897EN-D Table 39 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 15). pcmode [on | off]<cr>...

  • Page 59: Table 41 Tcmode Command

    Chapter 4 – Vaisala Industrial Protocol Syntax Description Example (enable temperature, pressure and relative humidity compensation using setpoint values): pass 1300 tcmode on T COMP MODE : ON pcmode on P COMP MODE : ON rhcmode on RH COMP MODE : ON Table 41 Tcmode Command...

  • Page 60: Other Commands

    GMP252 User Guide M211897EN-D 4.14 Other Commands Table 42 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 61: 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 30).
  • Page 62 GMP252 User Guide M211897EN-D...

  • Page 63: Vaisala Insight Software

    • 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. 242659). GMP252 probes support Insight from probe software version 1.3.0 onwards.
  • Page 64 GMP252 User Guide M211897EN-D Connect the probe to the Insight software in the exact order described in the following steps. 1. Open the Insight software. 2. Connect the USB cable to a free USB port on the PC. 3. Connect the probe to the USB cable.

  • Page 65: Using Gmp252 With Indigo Transmitters

    Chapter 7 – Using GMP252 with Indigo Transmitters 7. Using GMP252 with Indigo Transmitters 7.1 Indigo Overview Figure 14 GMP252 Attached to Indigo Transmitter 3.5” TFT LCD color display: non-display option with LED available for certain models. Probe locking wheel: insert probe, hold in place and turn the wheel counterclockwise.

  • Page 66: Wireless Configuration Interface Overview

    GMP252 User Guide M211897EN-D The probe can be connected to Vaisala Indigo transmitters, either directly on the transmitter from the probe's connector, or by using a cable between Indigo and the probe. Indigo transmitters are host devices that extend the feature set of connected probes with a range of additional options for outputs, configuration access, measurement viewing, and status monitoring.

  • Page 67: Taking A Probe In Use With Indigo

    Chapter 7 – Using GMP252 with Indigo Transmitters To use the wireless configuration interface to modify the settings of your Indigo transmitter and the connected probe, you must first enable the transmitter's wireless connection and then connect to Indigo with your mobile device or computer. Most major browsers (for example, Firefox, Chrome, Safari, and Internet Explorer) are supported: using the most recent version is recommended.

  • Page 68: Checking Indigo Support In Probe

    N or latter in alphabetical order) are compatible with Indigo. Made in Finland, Vaisala Oyj Vanha Nurmijärventie 21, FI-01670 Vantaa CO2 PROBE GMP251 A2B0A1N1 Output: 0... 20% CO2 RS485 Vaisala protocol Input: 12 – 30 V Serial No. N0310004 Figure 16 Serial Number on Probe Body (GMP251 Example)

  • Page 69: Attaching Probes And Cables

    Chapter 7 – Using GMP252 with Indigo Transmitters 7.3 Attaching Probes and Cables Figure 17 Attaching Probes and Cables to Indigo Insert probes into the probe connector with the orientation mark facing out. Probes are locked in place with the locking wheel. Never turn from the probe body.

  • Page 70: Connecting To Wireless Configuration Interface

    GMP252 User Guide M211897EN-D 7.4 Connecting to Wireless Configuration Interface  Indigo 200  Select WLAN to connect to: 1. WLAN XYZ 2. Indigo_IDxx 3. WLAN ABC Carbon dioxide concentration WLAN on Figure 18 Enabling and Accessing Indigo's Wireless Configuration Interface Wireless connection activation button...

  • Page 71: Logging In To Wireless Configuration Interface

    Chapter 7 – Using GMP252 with Indigo Transmitters 7.5 Logging in to Wireless Configuration Interface Figure 19 Indigo Login View When you open Indigo's wireless configuration interface in your browser, you are prompted to log in. There are 2 available user levels: •...

  • Page 72: Wireless Interface Menus

    GMP252 User Guide M211897EN-D 7.6 Wireless Interface Menus Figure 20 Wireless Configuration Interface, Desktop Browser View Measurements: displays the measurement data of the connected probe Status: contains information about the status of Indigo and the connected probe (for example, notifications and alarms) Calibration: calibrate and adjust probes using references.

  • Page 73: Configuring Analog Outputs With Indigo 201

    Chapter 7 – Using GMP252 with Indigo Transmitters 7.7 Configuring Analog Outputs with Indigo 201 Indigo 201 analog output transmitters have 3 analog current (mA) or voltage (V) outputs. Each analog output has the same set of configuration options (analog output 1 shown in example).

  • Page 74: Receiving Analog Output Settings From Probe

    When you take Indigo 201 in use for the first time and have not entered an analog output configuration, the transmitter automatically adapts the analog output configuration of the first Vaisala Indigo-compatible probe you connect. If an analog output configuration already exists in Indigo 201 (that is, you have previously connected a probe or configured the settings), you need to set the analog output configuration of the new probe manually.

  • Page 75: Using Modbus With Indigo 202

    Chapter 7 – Using GMP252 with Indigo Transmitters Figure 23 Selecting Indigo 201 Analog Output Mode 7.8 Using Modbus with Indigo 202 Indigo 202 digital transmitters are designed for Modbus RTU (RS-485) communication. There are 2 groups of Modbus register addresses in use in Indigo 202: probe registers and Indigo registers.

  • Page 76: Modbus Serial Communication Settings

    GMP252 User Guide M211897EN-D Address Name Data Type E002 Connected probe text [30] E011 Relay A status enum E012 Relay B status enum See the connected probe's Modbus documentation for probe-specific register information More Information ‣ Modbus Registers (page 113) ‣...

  • Page 77: Configuring Relays With Indigo

    Chapter 7 – Using GMP252 with Indigo Transmitters 7.9 Configuring Relays with Indigo Indigo transmitters have 2 configurable relays (relay A and relay B). Both relays have configuration options for selecting the parameter that is used to control the relay, activation triggers, hysteresis, and error state behavior.

  • Page 78: Changing Environmental Compensation Settings With Indigo

    The configuration options in Indigo transmitters include probe-specific settings that vary depending on the features of the connected probe. In the case of Vaisala CARBOCAPâ Carbon Dioxide Probes GMP251 and GMP252, the probe- specific settings allow configuring the filtering factor and environmental compensations.

  • Page 79: Configuring Filtering Factor With Indigo

    Chapter 7 – Using GMP252 with Indigo Transmitters 4. Enter the power-up default compensation values that are stored into the probe's permanent memory. The values entered into the Compensation power-up defaults fields remain in use also after probe reset. 5. The values you enter are saved automatically when you exit the input field (for example, tap on an area outside of the field).

  • Page 80: Calibrating Gmp252 With Indigo

    50. More Information ‣ Filtering Factor (page 120) 7.12 Calibrating GMP252 with Indigo 7.12.1 Indigo Calibration Overview You can carry out 1-point and 2-point adjustments with the Indigo transmitter's wireless configuration interface. In addition to calibrating and adjusting probes, you can view the current adjustments and restore the probe's factory adjustment.

  • Page 81: Figure 26 Start Calibration Button

    Chapter 7 – Using GMP252 with Indigo Transmitters • Configuration: options for using environmental compensations (probe-specific range of options) that allow compensating for the conditions present in the calibration environment, for example, pressure, temperature, and background gases. Also includes probe-specific configuration options that are not mandatory for use with Indigo.

  • Page 82: Restoring Factory Adjustment

    Do not remove the PIN code from the probe settings unless you need to block access to calibration settings. For GMP252, the calibration PIN code is 1300. 7.12.4 1-point Adjustment with Indigo Prepare the calibration reference (for example, a reference gas with a known concentration)
  • Page 83 Chapter 7 – Using GMP252 with Indigo Transmitters When you enter a value into a field, the value is saved automatically when you exit the input field (for example, tap on an area outside of the field). To make a 1-point adjustment with Indigo wireless configuration interface: 1.

  • Page 84: 2-Point Adjustment With Indigo

    GMP252 User Guide M211897EN-D 6. Place the probe in the reference environment (adjustment point 1) and wait until the measurement has stabilized. You can follow the stabilization from the Measurements tab. 7. Enter the value of the reference (for example, 500 if calibrating with a 500 ppmCO reference gas) into the Reference value, point 1 field.
  • Page 85 Chapter 7 – Using GMP252 with Indigo Transmitters 7. Enter the value of the first reference (for example, 0 if calibrating with a 0 ppmCO reference gas) into the Reference value, point 1 field. 8. After you enter the reference value, the value of the Measured value, point 1 field updates automatically.
  • Page 86 GMP252 User Guide M211897EN-D...

  • Page 87: Operating With Mi70 Indicator

    GM70 Hand-Held Carbon Dioxide Meter. The MI70 indicator is a convenient service tool for viewing the measurement readings and performing calibration and one-point adjustment. When MI70 is used with GMP252, it is recommended to use the rechargeable battery pack instead of alkaline batteries due to the relatively high power usage in CO measurement.

  • Page 88: Graphical Display

    1. If the probe is installed permanently into a device (for example, an incubator or a chamber), disconnect the probe from the connector. 2. If the MI70 indicator is on, turn it off. 3. Connect the probe to the MI70 indicator using the MI70 connection cable (Vaisala order code: CBL210472).

  • Page 89: Mi70 Indicator Parts

    Chapter 8 – Operating with MI70 Indicator 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. The parameters measured by probe will start to show valid measurement results after a few seconds. 8.6 MI70 Indicator Parts Figure 28 MI70 Indicator Parts Charger socket...

  • Page 90: Recording Data

    GMP252 User Guide M211897EN-D 3. To view the saved display, go to basic display and select Record > View recorded data. Alternatively, select Main menu > Recording/Viewing > View recorded data. A list of saved displays and data recordings appears. The icons on the left of the date...

  • Page 91: Calibration And Adjustment With Mi70 Indicator

    (for example, Pcomp shows 1013.2 hPa). This is the default compensation value that is mathematically neutral for the probe’s internal compensation model. GMP252 cannot receive the compensation values from a second probe connected to MI70. Only direct configuration is supported.

  • Page 92: 1-Point Adjustment With An Mi70-Compatible Reference Probe

    2. Connect the calibrated reference probe to Port II. Make sure the reference probe is in the same environment as GMP252's sensor. 3. If you are using the calibration adapter to feed a calibration gas to GMP252, you must feed the same gas to the reference probe as well. Refer to the documentation of your reference probe on how to do this and what accessories you need.

  • Page 93: 1-Point Adjustment With A Reference Gas

    8.10.2 1-Point Adjustment with a Reference Gas 1. Connect GMP252 to Port I of the MI70 indicator. 2. Feed a calibration gas to the GMP252 using the calibration adapter accessory (Vaisala order 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 94 GMP252 User Guide M211897EN-D 8. The adjustment mode is now active, and you can see the measured CO reading on the screen. To proceed with the adjustment, press Adjust. 9. Select 1-point adjustment. 10. You will be prompted if you really want to adjust. Select Yes.

  • Page 95: Maintenance

    Chapter 9 – Maintenance 9. Maintenance 9.1 Cleaning 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 96: Changing The Filter

    Performing an accurate calibration and adjustment takes some time and preparation. Instead of doing it yourself, you can also have a Vaisala Service Center calibrate and adjust your probe. Calibration means comparing the measurement output of the device to a known reference, such as a known environment in a calibration chamber or the output of a reference instrument.

  • Page 97: Calibration Setup

    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 order code DRW244827SP). Gas flow should be in the range 0.5 ... 1.1 l/min, recommendation is 1 l/min.

  • Page 98: Limits Of Adjustment

    Modbus interface and the Vaisala industrial protocol are recommended. If you want to compare the reading of the probe to a reference instrument and adjust it accordingly, use an MI70 hand-held indicator and a reference probe.

  • Page 99: Drw244827Sp Calibration Adapter

    Chapter 9 – Maintenance More Information ‣ Calibration and Adjustment (page 49) ‣ Configuration Registers (page 114) ‣ Calibration and Adjustment with MI70 Indicator (page 89) ‣ Indigo Calibration Overview (page 78) 9.3.5 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.
  • Page 100 GMP252 User Guide M211897EN-D...

  • Page 101: Troubleshooting

    Chapter 10 – Troubleshooting 10. Troubleshooting 10.1 Problem Situations Problem Possible Cause Remedy Analog output reading is Analog output is in error state. Remove the cause of the error unchanging and appears incorrect. state and the analog output will recover its normal function. Probe outputs stars "****"...

  • Page 102: Analog Output Error State

    GMP252 User Guide M211897EN-D Error Message Description Recommended Action Critical errors Program memory crc critical error Program memory is corrupted. Fatal error, contact Vaisala. Parameter memory crc critical Parameter memory is corrupted. Fatal error, contact Vaisala. error Errors Low supply voltage error Check supply voltage.

  • Page 103: Indigo Wireless Connection Troubleshooting

    More Information ‣ Analog Output Overrange Behavior (page 18) 10.4 Indigo Wireless Connection Troubleshooting The following table contains troubleshooting information related to accessing the wireless (WLAN) configuration interface of Vaisala Indigo transmitters. Problem Possible Cause Remedy The wireless device has connected...
  • Page 104 GMP252 User Guide M211897EN-D Problem Possible Cause Remedy The interface does not open in the The browser has issues with Enter the default Indigo IP address browser. loading the landing page. http://192.168.1.1 in the browser's address bar. Cannot connect to the Indigo...

  • Page 105: Technical Data

    Chapter 11 – Technical Data 11. Technical Data 11.1 GMP252 Specifications Table 47 Measurement Performance Property Description/Value Measurement range 0 ... 10 000 ppmCO (up to 30 000 ppmCO with reduced accuracy) Accuracy at 25 °C and 1013 hPa (incl. Repeatability and Non-Linearity) 0 ...

  • Page 106: Table 48 Operating Environment

    GMP252 User Guide M211897EN-D Property Description/Value with compensation, 0 ... 10 000 ppm%CO ±0.6 % of reading (at +25 °C (+77 °F)) 0 ... 90 %O without compensation (typical) -0.08 % of reading/%O Start-Up, Warm-Up and Response Time Start-up time at +25 °C <...

  • Page 107: Table 50 Inputs And Outputs

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

  • Page 108: Spare Parts And Accessories

    Information on spare parts, accessories, and calibration products is available online at www.vaisala.com and store.vaisala.com. Name Order Code Porous sintered PTFE filter for GMP252 DRW244221SP Probe cable with open wires (1.5 m (4.9 ft)) 223263SP Probe cable with open wires and 90° plug (0.6 m (1.97 244669SP Probe cable with open wires (10 m (32.8 ft))

  • Page 109: Gmp252 Probe Dimensions

    Chapter 11 – Technical Data 11.3 GMP252 Probe Dimensions 130 mm [5.11 in], Ø 25 mm [0.98 in] M12 male connector 12 mm 76 mm 42 mm [0.47 in] [2.99 in] [1.65 in] Figure 33 GMP252 Dimensions 11.4 243261SP Mounting Flange Dimensions 35.4...

  • Page 110: Drw244827Sp Calibration Adapter Dimensions

    GMP252 User Guide M211897EN-D Ø 60 Ø 36 Ø 25.6 Ø 28.5 Ø 42 Figure 35 243261SP Mounting Flange Dimensions, Cross Section 11.5 DRW244827SP Calibration Adapter Dimensions Figure 36 DRW244827SP Calibration Adapter Dimensions...

  • Page 111: Asm212017Sp Spray Shield Dimensions

    Chapter 11 – Technical Data 11.6 ASM212017SP Spray Shield Dimensions 72 [2.83] Ø 40 [1.57] Shield + GMP251: 113 [4.45] [in] Shield + GMP252: 146 [5.75] Figure 37 ASM212017SP Spray Shield Dimensions Figure 38 GMP252 Spray Shield Cross Section...

  • Page 112: Dtr250 Radiation Shield Dimensions

    GMP252 User Guide M211897EN-D 11.7 DTR250 Radiation Shield Dimensions 105 [4.13] [in] Figure 39 DTR250 Radiation Shield Dimensions (mm)

  • Page 113: Dtr250A Pole Mounting Kit Dimensions

    Chapter 11 – Technical Data 11.8 DTR250A Pole Mounting Kit Dimensions 105 [4.13] 213 [8.38] [in] Figure 40 DTR250A Pole Mounting Kit Dimensions (in mm [inch])
  • Page 114 GMP252 User Guide M211897EN-D...

  • Page 115: Appendix A: Modbus Reference

    Appendix A – Modbus Reference Appendix A. Modbus Reference A.1 Function Codes Table 51 Supported Function Codes Function Code (Decimal) Function Code (Hexadecimal) Name Read Holding Registers Write Multiple Registers 43/14 / 0E Read Device Identification A.2 Modbus Registers CAUTION! Registers are numbered in decimal, starting from one. Register addresses in actual Modbus messages (Modbus Protocol Data Unit (PDU) are in hexadecimal and start from zero.

  • Page 116: Configuration Registers

    GMP252 User Guide M211897EN-D Register Address Register Description Data Format Unit Number (Hexadecimal) (Decimal) 0101 Measured CO value 16-bit signed integer ppm (scaled, up to approx. 320 000 ppm) The ppm output of the second Measured CO value register (number 258) is scaled and must be multiplied by 10.
  • Page 117 Appendix A – Modbus Reference Register Address Register Description Data Unit / Valid Range Number (Hexadecimal) Format (Decimal) 020C Volatile (value cleared 32-bit float Range 0 … 100 %RH at probe reset) (Init copied from power-up humidity value) compensation 020E Volatile (value cleared 32-bit float Range 0 …...

  • Page 118: Status Registers

    GMP252 User Guide M211897EN-D Register Address Register Description Data Unit / Valid Range Number (Hexadecimal) Format (Decimal) 0308 filtering factor 16-bit Valid range 0 ... 100 integer (default: 100 (no filtering)). For information on setting the filtering factor, see Filtering Factor (page 120).

  • Page 119: Device Identification Objects

    Probe " MajorMinorVersion Software version (for example "1.2.3") VendorUrl "http:// www.vaisala.com/" ProductName "GMP25X " Transmitter serial number SerialNumber (for example, "K0710040") Date of the factory Calibration date calibration Information text of the Calibration text factory calibration Vaisala-specific device information object...

  • Page 120: Modbus Communication Examples

    GMP252 User Guide M211897EN-D A.3 Modbus Communication Examples Reading CO Value Device address used in the following examples is 240 (F0 The values returned by the device differ depending on the ambient conditions and/or device settings. Your device might not return exactly same values.
  • Page 121 Appendix A – Modbus Reference Writing Volatile Compensation Pressure Value Request Response Bytes on the Line Description Bytes on the Line Description (Hexadecimal) (Hexadecimal) (silence for 3.5 bytes) Start of Modbus RTU (silence for 3.5 bytes) Start of Modbus RTU frame frame GMP25x address...

  • Page 122: Filtering Factor

    GMP252 User Guide M211897EN-D A.4 Filtering Factor Modbus register 777 sets the CO filtering factor. The filtering factor affects the speed at which the latest CO measurement is integrated into the output of the probe. A new measurement is produced approximately every two seconds.

  • Page 123: Warranty

    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 •...
  • Page 124 GMP252 User Guide M211897EN-D...
  • Page 126 www.vaisala.com...

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