Vaisala MGP241 User Manual
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Vaisala MGP241 User Manual

Vaisala MGP241 User Manual

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About this document
Version information
This document provides instructions for installing, using, and maintaining Vaisala MGP241 Multigas Probe for carbon dioxide and
humidity measurement.
Document versions (English)
Document code
Date
M213080EN-A
October 2024
Documentation conventions
WARNING! Warning alerts you to a hazardous situation that, if not avoided, could result in death or serious
injury.
CAUTION! Caution alerts you to a hazardous situation that, if not avoided, could result in minor or moderate
injury.
NOTICE! Notice alerts you to a situation that, if not avoided, could result in the product to be damaged or
important data to be lost.
Highlights important information on using the product.
Trademarks
Vaisala® and CARBOCAP® 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.
First version.
Description

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Summary of Contents for Vaisala MGP241

  • Page 1 About this document Version information This document provides instructions for installing, using, and maintaining Vaisala MGP241 Multigas Probe for carbon dioxide and humidity measurement. Document versions (English) Document code Date Description M213080EN-A October 2024 First version. Documentation conventions WARNING! Warning alerts you to a hazardous situation that, if not avoided, could result in death or serious injury.

  • Page 2: Measurement Parameters

    Wet basis and dry basis measurement output MGP241 carbon dioxide and water vapor measurements can be shown either as wet basis or dry basis values. The wet basis / dry basis measurement output selection is made when ordering the probe, and can be configured with Vaisala Insight PC software or Modbus.
  • Page 3 MGP241 probe parts MGP241 probe parts Cable connection ports Grounding point Tightening nut: only tighten from the tightening nut when installing (wrench size: 50 mm (1.97 in)) 1.5 in male NPT thread: never install to any other thread type than 1.5 in female NPT thread Probe filter 1.5 in NPT thread test plug...
  • Page 4 Cable connection ports MGP241 cable connectors M4 ring terminal: grounding point M12-4F port: analog input M12-5M port: used for powering and digital output M12-8M port: used for powering and analog outputs Breather plug: do not adjust...

  • Page 5: Measurement Principle

    Measurement principle The Vaisala CARBOCAP® sensor used in the probe is a silicon-based, non-dispersive infrared (NDIR) sensor for the measurement of carbon dioxide (CO ), and humidity (H Probe cuvette with mirror and sensor chips Mirror Cuvette Sensor chips under TO5 packages...
  • Page 6 TO5 packages with hermetic windows are used to protect the sensor chips from moisture and contamination. Measurement in the measurement cuvette Mirror Light absorbed by the measured gases Sensor chips under TO5 packages (see items 4–8) Hermetic window Thermopile detector Hermetic window Fabry–Pérot interferometer Light source (microglow)

  • Page 7: Regulatory Statements

    Regulatory statements FCC Part 15 compliance statement This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.

  • Page 8: Installation Preparations

    Inspect the probe for any possible damage or dirt that could compromise the leak tightness of the device. If you install MGP241 to the process using a ball valve, note that it is necessary to use a 2 in ball valve and a reducer in order to accommodate the probe head (diameter 1.58 in).
  • Page 9 ≥ 2 pipe diameters upstream to the next bend or similar feature. For best results, use the orientation and installation depth of MGP241 threaded port installation example with recommended orientation and depth. recommended MGP241 installation position on pipeline...

  • Page 10: Installing The Probe

    If unsure, verify the thread type with the NPT 1.5 in thread test plug. When you use a ball valve to install MGP241, it is necessary to use a 2 in ball valve and a reducer in order to accommodate the probe head (diameter 40 mm (1.58 in)).
  • Page 11 Do not tape beyond the edge of the threads or leave loose tape hanging. . Insert the probe into the 1.5 in female NPT installation port and rotate it clockwise until it sits firmly in the port. Do not tighten the probe to full tightness, only enough to keep it securely in place when wiring. An external pressure measurement instrument is shown here as an example of pressure compensation input options: for a description of alternative options, see Pressure compensation input...
  • Page 12 Threaded installation port with 1.5 in female NPT thread on the process pipe. For best results, install MGP241 horizontally. The recommended position for the tip of the filter is within 1/3 of the pipe's diameter from the pipe centerline. If this is not achievable, other positions inside the pipe can be used as well. In smaller pipes, the installation depth can be adjusted by using an adapter such as a ball valve.

  • Page 13: Ball Valve Installation

    1.5 in male NPT thread on MGP241: never install to any other thread type than 1.5 in female NPT. When you use a ball valve to install MGP241, it is necessary to use a 2 in ball valve with a 1.5 in thread reducer in order to accommodate the probe head (diameter 1.57 in).
  • Page 14 Flow-through adapter installation You can install MGP241 with an flow-though adapter accessory (Vaisala order code: 258877). MGP241 in flow-through adapter 258877 Mounting plate (attach to mounting surface with screws or ties) Gas tube inlet port, G 1/8 (on the other side of the adapter)
  • Page 15 Wiring M12 4-pin A-coded female connector pinout Pin # Function Notes Wire colors in Vaisala cables 4–20 mA, isolated, for external pressure or Analog input + Brown temperature sensor Not connected White 4–20 mA, isolated, for external pressure or Analog input -...

  • Page 16: Finalizing Installation

    . Attach the mounting screw set to the probe grounding point. The correct order for the mounting screw set installation is ring terminal, washer, and screw. Tightening torque for the screw is 3 Nm. . Connect the MGP241 grounding point to the grounding rail of the installation site with a ≥ 4 mm wire. Attach the wire to the ring terminal and press the terminal shut tightly.
  • Page 17 Technical data MGP241 specifications Measurement performance Carbon dioxide CO Water vapor H Property Sensor CARBOCAP® CARBOCAP® Volume-%, ppm , dew point °C, dew Volume-%, ppm Measurement unit point °F 0–25 vol-%, −10 … +60 °C Measurement range 0–100 vol-% (+14 … +140 °F) 0–90 vol-%: ±2 vol-% Accuracy at +25 °C (+77 °F) and 0–25 vol-%: ±0.5 vol-%...
  • Page 18 Property Description/Value Digital communication Serial communication RS-485 (Modbus RTU) Mechanical specification Property Description/Value Weight 1.4 kg (3.09 lb) M12 5-pin male for digital output Connectors M12 8-pin male for analog output M12 4-pin female for analog input Materials Probe body AISI316L stainless steel, PPS Filter cap Sintered PTFE Operating environment...

  • Page 19: Recycling Instructions

    Always follow local requirements when disposing of the product. Vaisala encourages to use the best available recycling practices to minimize related environmental impacts.

  • Page 20: Modbus Registers

    Modbus reference Data encoding In the data registers, the numeric values are available in one or two formats with separate register addresses: 32-bit IEEE floating point format and/or 16-bit signed integer format. 32-bit floating point or 32-bit integer format Registers using 32-bit float data format are encoded using the binary32 encoding defined in IEEE 754. The format is also known as "single-precision floating point format".

  • Page 21: Measurement Data Registers

    Measurement data registers Modbus measurement data registers (read-only) Register number Address Register description Data format Unit (decimal) (hexadecimal) Floating point values Carbon dioxide (CO 0x0004 32-bit float concentration Carbon dioxide (CO 0x0006 32-bit float concentration, dry basis Water (H O) concentration 0x0008 32-bit float Water (H...
  • Page 22 Register number Address Register description Data format Valid range (decimal) (hexadecimal) Environmental compensation Valid range 4800– 115200 4 = 4800 5 = 9600 6 = 19200 1538 0x0601 Bit rate Enum 7 = 38400 8 = 57600 9 = 115200 (default: 6 (19200)) 0 = N,8,1 1 = N,8,2...
  • Page 23 Register number Address Register description Data format Valid range (decimal) (hexadecimal) Environmental compensation Minimum and maximum values 0x0004 (CO vary for different parameters. basis) 0x0006 (CO basis): Minimum: 0 Maximum: 1000000 Output parameters 0x0008 (H O wet basis) 0x000A (H O dry basis) Minimum: 0...
  • Page 24 Register number Address Register description Data format Valid range (decimal) (hexadecimal) Environmental compensation Output parameters 0x000C (T 0x000E (T Minimum: -10 Maximum: +60 Output parameters 0x0004 (CO basis) 0x0006 (CO basis): Minimum: 0 Maximum: 1000000 Output parameters Scale high end for analog output 0x0008 (H O wet 2 measurement parameter.
  • Page 25 Register number Address Register description Data format Valid range (decimal) (hexadecimal) Environmental compensation 0x0008 (H O wet basis) 0x000A (H O dry basis): Minimum: 0 Maximum: 250000 Output parameters 0x000C (T 0x000E (T Minimum: -10 Maximum: +60 Output parameters 0x0004 (CO basis) 0x0006 (CO basis):...
  • Page 26 Register number Address Register description Data format Valid range (decimal) (hexadecimal) Environmental compensation Minimum: -200 Maximum: +400 2567 0x0A06 Input value (read-only) Float Status registers Modbus status data registers (read-only) Register Address number Register description Data format Bitmask (hexadecimal) (decimal) Error codes in register 0x0200 0x0200 Device status code low...

  • Page 27: Device Identification Objects

    MajorMinorVersion "1.2.3") 0x03 VendorUrl "http://www.vaisala.com/" "Vaisala Multigas Probe 0x04 ProductName MGP241" Probe serial number (for 0x80 SerialNumber example, "R0710040") 0x81 Date of the factory calibration Calibration date Information text of the factory 0x82 Calibration text calibration Vaisala-specific device information object.

  • Page 28: Warranty

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

  • Page 29: Technical Support

    Technical support Contact Vaisala technical support at helpdesk@vaisala.com. Provide at least the following supporting information as applicable: Product name, model, and serial number Software/Firmware version Name and location of the installation site Name and contact information of a technical person who can provide further information on the problem...

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