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The Vaisala CARBOCAP GMP252-Indigo202 is a smart probe that measures carbon dioxide (CO2) in a variety of applications such agriculture, refrigeration, greenhouses, plant growth chambers and demanding HVAC environments where stable and accurate ppm-level CO2 measurements are needed. The GMP252-Indigo202 can be combined with the DTR250 or DTR250A shield to measure CO2 outdoors.
The GMP252-Indigo202 probe is part of the Indigo product family and can also be connected to the Indigo Indigo 200 series transmitters to extend its features, for example, for a display or relays.
Vaisala CARBOCAP GMP252 Specifications
| Measurement range | 0 ... 10,000 ppm CO2 (up to 30,000 ppm CO2 with reduced accuracy) |
Measurement accuracy | At 25 °C and 1013 hPa: 0 ... 3000 ppm CO2: ±40 ppm CO2, |
| Operating temperature | -40 ... +60 °C (-40 ... +140 °F) |
| Operating pressure | Compensated 500 ... 1100 hPa, Operating < 1.5 bar |
| Operating voltage | 12 ... 30 VDC digital output, 12 ... 30 VDC voltage output, 20 ... 30 VDC current output |
| IP rating | IP65 |
| Analog outputs | 0 ... 5/10 V (scalable), min load10 kΩ, 0/4 ... 20 mA (scalable), max load500 Ω |
| Digital outputs | RS-485, Modbus |
Vaisala Indigo 202 Analog Output Transmitter Specifications
| Operating temperature | With display -4 … +140 °F (-20 … +60 °C) Without display -40 … +140 °F (-40 … +60 °C) |
| Storage temperature | -40 … +158 °F (-40 … +70 °C) |
| Chemical tolerance | Temporary exposure during cleaning: • H2O2 (6000 ppm, non-condensing) • Alcohol-based cleaning agents such as ethanol and IPA (max. 70 % concentrate) |
| IP rating | IP65 |
| Indoor/outdoor use | Indoor use |
| Inputs and outputs | |
| Insight PC software configuration access | USB-C port on transmitter (compatible with generic USB cables) |
| Power supply input | 15 … 30 V DC (1) 24 V AC ±10 % 50/60 Hz |
| Relay contacts x 2 | Max. switching current 1 A Max. switching voltage 40 V DC / 28 V AC |
| Digital communications | RS-485, Modbus RTU |
(1) When used with the HMP7 probe, the minimum required power supply input is 18 V DC.
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