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TGR Series

Recessed Dual Toxic Gas Sensor/Controller
Higher Reliability, Faster Installation, Superior Accuracy | Sense the Difference

TGR Recessed Dual Toxic Gas

Low profile fits standard j-box & use SenvaSync app to make updates quickly IP54 enclosure (protected from dust and splashing water) Magnetic calibraton adaptor available Made in the USA

Choose from14 gases: CO/NO2, combustibles, refrigerants and most A2L & A3 gasses
Choose Modbus RTU and BACnet MS/TP protocols or Analog output
Field replaceable factory-calibrated sensing elements
Integrated LED indicator, audible alarm, and two configurable relay outputs

  • NEW! Configure and update firmware with the SenvaSync app
  • Single or dual sensors on each unit. (refrigerant sensors may only be single element units)
  • Choose from up to two gases, supporting CO, CO2, NO2, CH4, C3H8, H2, O2. H2S, NH3, refrigerants and most A2L & A3 gasses
  • Field-replaceable, digital factory-calibrated elements automatically adjust set-point and alarm thresholds for easy installation
  • Dual analog outputs support daisy chain wiring to cost-effectively sense and control large areas
  • Standard setpoint relay for direct fan control or daisy chain for central alarm activation eliminates need for costly controllers
  • Rugged enclosure is unobtrusive,  and tamper resistant for both surface or recessed j-box
  • 7-year limited warranty on electronics; 2-years on sensor elements
  • Calibration certificate included with every sensing element to facilitate fast commissioning
  • UL listing for element only, UL2034 recognized electrochemical CO sensing element


Senva UL Listed TG Series sensors can be ordered as individual CO or NO2 sensors or as a combination CO/NO2 sensor in a shared enclosure. The analog output model features 2 outputs that support daisy chain wiring - multiple sensors may be used in a parallel sequence (0-10V) for cost effective coverage of large areas. The unit can also act as a stand alone controller, utilizing the relay for exhaust fan operation or the output for direct control of a VFD. The BACnet/Modbus model supports BACnet MS/TP & Modbus network communication in one unit. Standard features include network auto-configuration, a programmable fan relay, LED indicators, integrated display and audible alarm.


  • Monitor and alert occupants of dangerous air
  • Ensure adequate air flow in occupied spaces
  • Alert occupants of elevated gas levels   
  • Directly control exhaust fans
  • Parking lot CO/NO2 combo
  • Leak detection for VRV refrigerant systems
  • Monitor spaces heated by gas RTUs
Product Price Quantity
TGR-B8X TG, Recessed, Comms, 513A
$1,001.70 /


TGR-B9X TG, Recessed, Comms, 1233ZDE
$1,001.70 /


TGR-BCN TG, Recessed, Comms, CO NO2
$1,168.65 /


TGR-BCX TG, Recessed, Comms, CO
$918.23 /


TGR-BHX TG, Recesed, Comms, Hydrogen
$1,001.70 /


All prices shown are excluding tax unless otherwise specified.