Senva TG Series sensors can be ordered as individual CH4 sensor, C3H8 sensor, H2 sensor, O2 sensor, H2S sensor, or specify two sensing elements in one enclosure including CO and NO2. 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. Order the NEW fail-open relay version for streamlined integration into fire control panels. The BACnet/Modbus model supports BACnet MS/TP & Modbus network communication in one unit. Standard features include network auto-configuration, a programmable two-staged relays, LED indicators, integrated display and audible alarm.
- Boiler rooms
- Commercial kitchens
- Battery Rooms
- Battery Energy Storage Systems (BESS)
- Compressed Gas storage
- Residential and commercial heating and water heating
- Vehicle bays and garages for natural gas (LNG) or petroleum gas (LPG) vehicles
- Waste facilities

Power Supply |
TG-REM |
15-30VDC/24VAC(1), 4W max, 160mA max. |
Wiring |
Conductor |
14-24 AWG, Minimum 600V, 75oC |
Analog Outputs |
2 programmable outputs |
0-10V (default), 0-5V, 1-5V and 4-20mA (menu selectable) |
BACnet /Modbus |
Protocol RS-485 |
BACnet MS/TP, Modbus RTU, Modbus ASCII |
Fan Relay |
Fan relay characteristics (Standard Version) |
N.C. 1A@24/30VDC (50/60Hz) (no mains connection) |
Alarm Relay |
Alarm relay characteristics (Standard Version) |
N.C. 1A@24/30VDC (50/60Hz) (no mains connection) |
Display |
3-1/2 digit LCD |
Indicates CO ppm, NO2 ppm (menu selectable) |
LEDs |
Green, Yellow, Red |
Green = Normal, Yellow = Warning/Fan Relay, Red = Alarm/Alarm Relay |
Audible Alarm |
85dB Piezo transducer |
30 minutes above alarm setpoint per UL2075 |
CO Sensor Performance |
Type |
Electrochemical |
NO2 Sensor Performance |
Type |
Electrochemical |
Carbon Dioxide (CO2) |
Type |
Non-Dispersive Infrared (NDIR) |
Methane/Propane / Hydrogen Sensor Performance |
Type |
Catalytic |
Oxygen Sensor Performance |
Type |
Electrochemical |
H2S Sensor Performance |
Type |
Electrochemical |
Ammonia NH3 Sensor Performance |
Type |
Electrochemical |
Refrigerant Sensor Performance |
Type |
MOS |
Operating Environment |
Temperature, Continuous |
-20 to 50oC (-4 to 122oF) (CO2 versions rated to -40oC) |
Enclosure |
Material |
ABS/Polycarbonate |
Enclosure |
Material & Enclosure Rating |
Powder-coated steel |
Agency |
Compliance |
UL61010-1 Listed UL, cUL, CE, UL2075 Recognized CO and NO2 elements |
(1) One side of transformer secondary is connected to signal common. Dedicated transformer is recommended. No mains circuit connection allowed. In addition, it is required to use an isolated power supply that is certified by a national or international standard (i.e. UL). Use of a Class 2 LPS power supply or greater is required.
(2) R134A sensor is factory calibrated to R134A gas but may be used as a general-purpose refrigerant sensor. Sensitivity to some other gases can be found in the installation manual. Actual response may vary depending on installation. For more accurate response to a specific gas, a unit may be field calibrated.
(3) These gases may be detected by the sensor but sensitivity curves are not available at this time.
(4) Carbon Monoxide full scale is 1000 ppm.
(5) Nitrogen Dioxide full scale is 30 ppm.
(6) CO2 sensor is equipped with a heater to account for temperatures down to -40°C.
(7) It is not recommended to de-activate ABC (auto-calibration) except for continuously occupied spaces or greenhouses. Drift ratings may vary based on environment.
(8) Combination CO/Methane, CO/Propane, or CO/Refrigerant sensors should be mounted according to Propane/Methane/Refrigerant recommendations. Consult factory for other combinations. Mounting height recommendations may be adjusted according to installation. Ensure sensor is accessible for maintenance and target gas has unobstructed access to sensor. Mount in accordance with ANSI/NFPA 70 and NEC or CEC.
(9) A bump test involves exposing the sensor to a reference gas and detecting the sensor’s response. If sensor response is out of accuracy range, recalibration or replacement of the sensor element may be necessary.