GMP252 CO2 Probe for INDIGO transmitter, ppm range - Vaisala Online Store

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GMP252 CO2 Probe for INDIGO transmitter, ppm range

The Vaisala CARBOCAP® Carbon Dioxide Probe GMP252 is an intelligent probe for use with INDIGO transmitter bodies. This configuration is optimized for Indigo display, please see another configuration here in case you want to use the GMP252 probe as a stand-alone general purpose probe.

This probe is ideal for measuring carbon dioxide in agriculture, refrigeration, greenhouses and demanding HVAC applications. It is suitable for harsh and humid CO2 measurement environments where stable and accurate ppm-level CO2 measurements are needed.

The GMP252 is based on Vaisala’s unique, second-generation CARBOCAP® technology that enables exceptional stability. A new type of infrared (IR) light source is used instead of the traditional incandescent light bulb, which extends the lifetime of the GMP252.

The GMP252 incorporates an internal temperature sensor for compensation of the CO2 measurement according to ambient temperature. The effects of pressure and background gas can also be compensated for. The measurement range is selectable between 0 ... 2000 and 0 ... 20000 ppmCO2. The analog outputs of an INDIGO transmitter body will automatically scale according to the selected probe measurement range.

See Indigo compatible products

The operating temperature range of the probe is wide (-40…+60 °) and the probe housing is classified as IP65. Condensation is prevented as the internal sensor head is heated.

The GMP252 is resistant to dust and most chemicals, such as, H2O2 and alcohol-based cleaning agents.

The GMP252 replaces the following discontinued products:GMM222, GMP222, GMT222.

Please note that spare parts for the GMP222 probe are still available and can be purchased in the Vaisala online store.

The package includes:

  • GMP252 probe
GMP252 CO2 Probe for INDIGO transmitter, ppm range
Vaisala CARBOCAP® Carbon Dioxide P​robe GMP252 for agriculture, refrigeration, greenhouses and demanding HVAC applications.
Standard delivery time for single unit: 1 week
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Warranty: 24 months
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Detailed information

Measurement parameter(s)Carbon dioxide
Measurement range0 ... 2000/ 3000/ 5000/ 10000/ 20000 ppmCO2
Measurement accuracyat 25 °C and 1013 hPa:
0 ... 3000 ppmCO2 ±40 ppmCO2
3000 ... 10 000 ppmCO2 ±2% of reading
Up to 30 000 ppmCO2 ±3.5% of reading
Operating temperature-40 ... +60 °C
Operating voltageProvided by INDIGO transmitter
Digital outputsDigital protocol for INDIGO transmitter
Housing classificationIP65
Links See full specifications on
Download user guides and other product documents on

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