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The Vaisala CARBOCAP® Carbon Dioxide Probe GMP251-Indigo202 is an intelligent, stand-alone, %-level probe for measuring CO2 in life science incubators, cold storage facilities, fruit and vegetable transportation, and in all demanding applications where stable and accurate percentage-level CO2 measurements are needed. The operating temperature range is -40 … +60 °C and the measurement range is 0 … 20%CO2.
The GMP251-Indigo202 is based on Vaisala’s unique, second-generation CARBOCAP® technology that provides the utmost in stability. A new type of infrared (IR) light source is used instead of the traditional incandescent light bulb, which extends the lifetime of the GMP251-Indigo202. It has full temperature and pressure compensations of CO2 measurement – integrated temperature measurement for compensation purposes. The sensor head is heated to inhibit condensation. Digital output over RS-485: Modbus & Vaisala Industrial Protocol. A calibration certificate is always included with the product
The GMP251-Indigo202 probe is part of the Indigo product family and can also be connected to the Indigo 500 and Indigo 200 series transmitters to extend its features, for example, for a display or relays.
For spot-checking, the ideal choice is the Handheld CO2 Meter GM70.
Vaisala CARBOCAP GMP251 Specifications
Measurement Performance
Measurement range | 0 ... 20 %CO2 |
Accuracy at 25 °C (77 °F) and 1013 hPa (incl. repeatability and non-linearity) | |
At 5 %CO2 | ±0.1 %CO2 |
0 ... 8 %CO2 | ±0.2 %CO2 |
8 ... 20 %CO2 | ±0.4 %CO2 |
Calibration uncertainty | |
At 5 %CO2 | ±0.12 %CO2 |
At 20 %CO2 | ±0.32 %CO2 |
Long-term stability | |
0 ... 8 %CO2 | ±0.3 %CO2/year |
8 ... 12 %CO2 | ±0.5 %CO2/year |
12 ... 20 %CO2 | ±1.0 %CO2/year |
Temperature dependence | |
With compensation at 5 %CO2, 0 ... +50 °C (+32 ... +122 °F) | < ±0.05 %CO2 |
With compensation, 0 … 20 %CO2,-40 … +60 °C (-40 ... +140 °F) | ±0.045 % of reading/°C |
Without temperature compensation at 5 %CO2 (typical) | -0.25 % of reading/°C |
Pressure dependence | |
With compensation at 5 %CO2 700 ... 1100 hPa | ±0.05 %CO2 |
With compensation, 0 … 20 %CO2 500 ... 1200 hPa | ±0.015 % of reading/hPa |
Without compensation (typical) | +0.15 % of reading/hPa |
Humidity dependence | |
With compensation, 0 … 20 %CO2, 0 … 100 %RH | ±0.7 % of reading (at +25 °C (+77 °F)) |
Without compensation (typical) | +0.05 % of reading / %RH |
O2 dependence | |
With compensation, 0 … 20 %CO2, 0 ... 90 %O2 | ±0.6 % of reading (at +25 °C (+77 °F)) |
Without compensation (typical) | -0.08 % of reading / %O2 |
Flow rate dependence (for flow-through option) | |
< 1 l/min flow | No effect |
1 … 10 l/min flow | < 0.6 % of reading/ l/min |
Start-up time at +25 °C (+77 °F) | < 10 s |
Warm-up time for full spec. | < 4 min |
Response time (T90) | |
With standard filter | < 1 min |
Flow-through model with > 0.1 l/min | < 1 min |
With spray shield | < 2 min |
Operating environment
Operating temperature of CO2 measurement | -40 ... +60 °C (-40 ... +140 °F) |
Storage temperature | -40 ... +70 °C (-40 ... +158 °F) |
Pressure | |
Compensated | 500 ... 1100 hPa |
Operating | < 1.5 bar |
Humidity | 0 ... 100 %RH, non-condensing |
Gas flow (for flow-through option) | |
Operating range | < 10 l/min |
Recommended range | 0.1 … 0.8 l/min |
Condensation prevention | Sensor head heating, when power on |
EMC compliance | EN61326-1, Generic Environment |
Chemical tolerance (temporary exposure during cleaning) |
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Mechanical specifications
Weight, probe | 45 g (1.59 oz) |
Materials | |
Probe housing | PBT polymer |
Filter | PTFE membrane, PBT polymer grid |
Connector | Nickel plated brass, M12 / 5-pin |
IP rating, probe body | IP65 |
Connector | M12 5-pin male |
Dimensions | |
Probe diameter | 25 mm (0.98 in) |
Probe length | 96 mm (3.78 in) |
Inputs and outputs
Analog outputs |
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Digital output | Over RS-485:
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Operating voltage | |
With digital output in use | 12 ... 30 VDC |
With voltage output in use | 12 ... 30 VDC |
With current output in use | 20 ... 30 VDC |
Power consumption | |
Typical (continuous operation) | 0.4 W |
Maximum | 0.5 W |
Operating temperature Without Display | -40 ... +140 °F (-40 ... +60 °C) |
With Display | -4 ... +140 °F (-20 ... +60 °C) |
Operating voltage | 24 VDC/AC |
Analog outputs | 0...20 mA, 4...20 mA, 0...1 V, 0...5 V, 0...10 V, 1... 5 V, scaleable |
Housing classification | IP65 |
Vaisala Indigo 202 Digital Transmitter
Operating temperature | -4 ... +140°F (-20 ... +60 °C) |
Operating voltage | 24 VDC |
Digital outputs | Modbus RTU over RS485 |
Housing classification | IP65 |