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Did you know that Comet exists in a US version as well?
manufacturer of measuring instruments
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Technical data

Measured value

CO2

CO2 SENSOR

Measuring range 0 to 2000 ppm
Accuracy ±(50ppm +2% from reading) at 25°C and 1013hPa
Resolution 1 ppm

RELAY OUTPUTS

Quantity 2
Maximal voltage 50 V
Maximal current 2 A
Maximal power 60 VA

GENERAL TECHNICAL DATA

Operating temperature -30 to +60 °C
Channels internal CO2 sensor
Acoustic alarm from built-in beeper - switchable
Output RS232
Communication protocol ModBus RTU and Advantech ADAM compatible protocol
Power 9-30 Vdc
Protection class IP30
Dimensions 136 x 150 x 45 mm
Weight approx. 360 g
Warranty 3 years