TG UL Refrigerant Wall & Duct

Higher Reliability, Faster Installation, Superior Accuracy | Sense the Difference
Refrigerant Sensor/Controller
Sense most A2L and A3 gases
Analog and BACnet/Modbus protocol options
Rugged ABS or Metal enclosure options
Operates as a stand-alone sensor or local controller

  • Integrated display, LED indicators, audible alarm
  • Menu selectable 0-5/10V, 1-5V and 4-20mA outputs (0-10V default)
  • BACnet supports BACnet MS/TP and Modbus RTU networks with auto-configuration for network baud rate, serial format, protocol type, and self-addressing
  • Dual outputs support daisy chain wiring to cost-effectively sense and control large areas
  • UL2034 recognized electrochemical CO sensing element
  • Warning indicators alert occupants when the element’s lifecycle is near the end for replacement
  • Installer-friendly circuit board makes through-the-back wiring simple
  • Test mode speeds up field commissioning for verifying warning indicators and relay functions
  • Push buttons and LCD to navigate setting parameters
  • UL Listed (UL61010-1)
  • 7-year limited warranty on electronics; 2-year on elements

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Senva TG Series refrigerant sensors are a great solution for refrigerant leak detection in many applications. It can be ordered as individually calibrated R134A or R410A sensors or any combination with CO or NO2 sensors. Buy pre-calibrated for R134A or R410A or factory calibrate to any refrigerant including R134A, R410A, R407C, R404A, R22, R123. 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 one unit of MS/TP & Modbus network communication. Standard features include network auto-configuration, a programmable fan relay, LED indicators, an integrated display, and an audible alarm.

  • A2L and A3 leak detection in mechanical rooms
  • Pre-calibrated for R134A or R410A or factory calibrate to any refrigerant including R134A, R410A, R407C, R404A, R22, R123 and most A2L gases
  • Monitor multiple gases with one mounted unit
  • Alert occupants of elevated gas levels
  • Directly control exhaust fans
Power Supply

15-30VDC/24VAC(1), 4W max, 160mA max

Wiring

Conductor
Terminal Torque

14-24 AWG, Minimum 600V, 75°C
0,5 N·m

Analog Outputs

2 programmable outputs
CO Output Scaling
NO2 Output Scaling
CO2 Output Scaling
Propane/Methane/Hydrogen Output Scaling
Oxygen Output Scaling
Refrigerant Output Scaling
Hydrogen Sulfide (H2S) Output Scaling
Ammonia (NH3) Output Scaling
Temperature Output Scaling

0-10V (default), 0-5V, 1-5V, 4-20mA (menu selectable)
0-200ppm (default), 0-1000ppm (menu selectable)
0-10ppm (default), 0-30ppm (menu selectable)
0-10,000ppm (default); 0-10,000ppm (menu selectable)
0-50% LEL (default), 0-50% LEL (menu selectable)
0-25% Vol (default), 0-25% Vol (menu selectable)
0-1000ppm (default), 0-1000ppm (menu selectable)
0-100ppm (default), 0-100ppm (menu selectable)
0-100ppm (default), 0-100ppm (menu selectable)
-20 to 85°C

BACnet/Modbus

Protocol RS-485
Baud Rates
RS-485 Loading

BACnet MS/TP, Modbus RTU, Modbus ASCII
9600, 19200, 38400, 57600, 76800, 115200
1/4 unit

Fan Relay

Fan relay characteristics
Fan relay setpoint

N.C. 1A@24/30VDC (50/60Hz) (no mains connection)
300 ppm (default), 0-1000 ppm (menu selectable)

Alarm Relay

Alarm relay characteristics
Alarm relay setpoint

N.C. 1A@24/30VDC (50/60Hz) (no mains connection)
600 ppm (default), 0-1000 ppm (menu selectable)

Display

3-1/2 digit LCD

Indicates CO ppm, NO2 ppm, Temp (menu selectable) (menu selectable)

LEDs

Green, Yellow, Red

Green = Normal, Yellow = Relay, Red = Alarm

Audible Alarm

85dB @4" Piezo transducer

30 minutes above alarm setpoint per UL2075 (menu selectable)

CO Sensor Performance (6)

Type
Accuracy
Resolution
Certifications
Life Expectancy
Recommended Calibration
Recommended Height and Coverage Area

Electrochemical
±5% of Default Range, ±5% of Reading Above 200ppm
1ppm
UL2075 Recognized component
7 years
Annual
3 to 6 feet; coverage 500-7500 sq. ft.

NO2 Sensor Performance (7)

Type
Accuracy
Resolution
Certifications
Life Expectancy
Recommended Calibration
Recommended Height and Coverage Area

Electrochemical
±5% of Default Range, ±5% of Reading Above 20ppm
0.1ppm
UL2075 Recognized component
7 years
Annual
3 to 6 feet; coverage 5000 - 7500 sq. ft.

CO2 Sensor Performance

Type
Accuracy (8)
Drift with ABC disabled (9)
Range
Resolution
Life Expectancy
Response Time
Sample Rate
Recommended Height and Coverage Area

Non-dispersive Infrared (NDIR)
±(30ppm +3% of reading) (400-2000ppm), @-10-50°C
±(50ppm +5% of reading) Standard (2000-5000ppm), @-10-50°C
±(50ppm +3% of reading) Dual Channel (2000-5000ppm), @-10-50°C
±(100ppm +10% of reading) (5000-10000ppm), @0-50°C
35ppm/month (10) (Standard) 5ppm/month (10) (Dual Channel)
0-2000/5000ppm; Programmable up to 10,000ppm
1 ppm
15 years
30s
1s
3 to 6 feet; coverage 5000 - 7500 sq. ft.

Methane/Propane/Hydrogen Sensor Performance

Type
Detection Range
Accuracy
Resolution
Certifications
Life Expectancy
Response Time
Recommended Calibration
Long Term Stability Drift
Recommended Height and Coverage Area

Catalytic
0-50% LEL (Lower Explosive Limit)
±5% of Range
1% LEL
UL2075 Recognized component for Methane/Propane
>5years
<10s to 90%
Bump test annually, calibrate or replace if necessary. (11)
Zero: <±2mV/year
Sensitivity: <±2mV/month
Hydrogen/Methane: 0.5 to 1 foot from ceiling; coverage 5000-7500 sq. ft.
Propane: 1-3 ft. above finished floor; coverage 5000 square feet.

Oxygen Sensor Performance

Type
Detection Range
Accuracy
Resolution
Life Expectancy
Recommended Calibration
Recommended Height and Coverage Area

Electrochemical
0-25% Volume
±5% of Range
0.1%
5 years
Annual
3 to 6 feet; coverage 5000-7500 sq. ft.

Hydrogen Sulfide (H2S) Sensor Performance

Type
Detection Range
Accuracy
Resolution
Life Expectancy
Recommended Calibration
Recommended Height and Coverage Area

Electrochemical
0-100 ppm
±5% of Range
1 ppm
5 years
6 months
3 to 6 feet; coverage 5000 - 7500 sq. ft.

Ammonia (NH3) Sensor Performance

Type
Detection Range
Accuracy
Resolution
Life Expectancy
Recommended Calibration
Recommended Height and Coverage Area

Electrochemical
0-100 ppm
±5% of Range
0.1 ppm
5 years
6 months
0.5 to 1 foot from ceiling; coverage 5000-7500 ft.

Refrigerant Sensor Performance

Type
Detection Range
Resolution
R22, R134A, R410A, R404A, R407C
R134A Sensitivity(2)
Other detectable gases(3)
Life expectancy
Recommended Calibration
Recommended Height and Coverage Area

MOS
0-1000 ppm
1 ppm
Factory calibrated for respective gas
@300ppm test gas: 450 ppm R410A, 425 ppm R407C, 400 ppm R404A, 370 ppm R22, 300 ppm R134A, R134
R407A, R407F, R427A, R452B, R507, R448A, R454B, R455A, R455C, R422A, R422D, R452A, R514A, R32, R123. Consult factory for other A2L gases
>10 years (typical life expectancy for MOS sensors)
6 months
6 inches above floor; no more than 18 inches above lowest level of equipment location for leak detection; coverage 5000-7500 sq. ft. (Click for details)

Operating Environment

Temperature, Operational(4)
Humidity
Max Elevation

-20 to 50oC (MOS rated down to -30°C; CO2 versions rated to -40oC)
15-90% continuous, 0-99% intermittent
2000m, Refrigerant 2629 m (8625 ft) (5)

Enclosure
(Wall & Duct)

Material
Dimensions
Conduit Opening
Rating

ABS/Polycarbonate
4.0”h x 4.4”w x 2.1”d
Tapped 1/2” NPT
IP43 or NEMA 3R

Enclosure
(Metal)

Material
Dimensions
Opening
Mounting
Rating

Powder-coated steel/acrylic
5.0”h x 4.3”w x 2.25”d
Dual air vents on bottom of enclosure
Pre-drilled for 2x4” electrical box
IP41 or NEMA 3R

Agency

Compliance

UL61010-1 Listed UL, cUL, CE

  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.  Accuracy of CO2 reading may be reduced at temperatures below 14ºF (-10°C).
  5. Refrigerant sensors have been tested to perform at this altitude. To maintain accuracy spec, a field calibration is recommended.
  6. Carbon Monoxide full scale is 1000ppm.
  7. Nitrogen Dioxide full scale is 30ppm.
  8. CO2 sensor is equipped with a heater to account for temperatures down to -40°C.
  9. It is not recommended to de-activate ABC (auto-calibration) except for continuously occupied spaces or greednhouses. Drift ratings may vary based on encironment.
  10. Combination CO/Methane, CO/Propane, or CO/Refrigerant sensors should be mounted according to Propane/Methane/Refrigerant recommendations. Consult factory for other comvinations. 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.
  11. 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.

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