Part Number: 65-9080


The H-Guard is a CO2 transmitter series designed to be installed in HVAC applications.

List of Benefits

  • Real-time detecting CO2 level.
  • NDIR infrared CO2 module inside with four CO2 detection range selectable.
  • CO2 sensor has Self-Calibration Algorithm and 15 years lifetime
  • Wall-mounting
  • Providing one analog output with voltage or current selectable
  • 0~10VDC/4~20mA selectable easily via jumpers
  • Provide a special model with a on/off relay output with a touch button to operate a fan control.
  • Design for HVAC, ventilation systems, offices, or other public places.
  • Modbus RS485 communication interface optional: 15KV antistatic protection, independent address setting
  • CE-Approval


The CO2 sensing element uses the Non-Dispersive Infrared Technology (NDIR) with the patented self-calibration system to guarantee the long term stability and up to 15 years life time.

Available Models/ Parts

  • 65-9080    : H-Guard CO2 Transmitter, 1x4-20mA output 1 x Relay output0-2000ppm standard range
  • 49-9998-01 : Plug pack 240VAC/24Vdc 450mA
SpecificationDetail Description
Gas detectedCarbon Dioxide (CO2)
Sensing elementNon-Dispersive Infrared Detector (NDIR)
Accuracy@25(77),2000ppm ±40ppm + 3% reading
Stability<2% of FS over life of sensor (15 yr typical)
Calibration interval ABC Logic Self Calibration System
Response time<2 minutes for 90% step change
Warm up time2 hours (first time) 2 minutes (operation)
CO2 measuring range0-2,000ppm / 0-5,000ppm selectable in orders, 0-20,000ppm / 0-50,000ppm just for TSM-CO2-S series
Sensor lifeUp to 15 years
Power supply24VAC/24VDC
Consumption1.5 W max. ; 0.8 W avg.
Analog outputs0~10VAC or 4~20mA selectable by jumpers
Relay output1X3A switch load, Four set points selectable by jumpers
Modbus interfaceModbus RS485 interface 9600/14400/19200(default)/28800 or 38400bps (programmable selection), 15KV antistatic protection.
Operation conditions0~50(32~122); 0~95%RH, non condensing
Storage conditions-40~70(-40~158)
Net weight180g
Installation standard65mm×65mm or 2”×4”wire box

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