Senva CT1D-H3X Duct CO2 Sensor, No LCD, 3K thermistor

The Senva CT1D-H3X is a CT1D duct-mount CO2 sensor with a non-dispersive infrared (NDIR) sensing element and no LCD display. This configuration includes a 3K thermistor as its temperature sensing option; it is not the temperature-transmitter version.

CO2 output scaling is 0-2000 ppm by default, with selectable 0-5000 ppm and 0-10000 ppm ranges. The series provides 4-20 mA and 0-5 V/0-10 V analog outputs, with voltage selection by DIP switch. An integrated programmable normally open solid-state setpoint relay is rated 1 A at 30 VAC/DC.

For 0-2000 ppm, the datasheet lists accuracy as +/-30 ppm, +/-3% of reading; for 2000-5000 ppm, it lists +/-50 ppm, +/-5% of reading. These ratings apply at 0-50 degrees C and 0-85% RH. Consult the manufacturer for accuracy at 5000-10000 ppm. Supply requirements are 12-30 VDC, 50 mA maximum, or 24 VAC, 100 mA maximum.