Products

TGR Series

TGR Sensor/Controller | A2L Refrigerant + CO Detection
Higher Reliability, Faster Installation, Superior Accuracy | Sense the Difference

TGR Indoor Dual Toxic Gas

Fits standard 1-gang j-box & Configure powerlessly with the SenvaSync app. Modern, low-profile, tamper-proof enclosure - great for schools and high-traffic areas Magnetic calibration adaptor for fast, tool-free field calibration Made in the USA - 7 year warranty on electronics, buy American Act certified

UL2075 CO/NO2 elements, combustibles, and most A2L & A3 gases
SenvaSync App for easy settings configuration
Factory-calibrated and certified sensing elements
BACnet MS/TP protocol or analog outputs

NEW! Use the SenvaSync app without powering the device to pre-configure settings
- No DIP switches, no magnetic wand, no laptop
Factory-calibrated and certified single or dual sensors on each unit
- UL2075 listed CO sensing element meets code requirements for commercial CO detection in schools, offices, and commercial buildings
- A2L ready! Pre-calibrated for R-32, R-454A, R-454B, R-454C, R-452B, R455A, R-22, R-404A, R-407C, R134A, and more
Fits a standard j-box
Built-in BACnet MS/TP or dual daisy-chainable analog outputs (0–10V, 0–5V, or 4–20 mA)
Two independent, configurable relays
Tamper resistant enclosure, great for schools and high-traffic areas
7-year limited warranty on electronics; 2-year warranty on sensor elements

TGR Introduction

Calibrating the Recessed Toxic Gas Sensor (TGR)

Description

The TGR is a recessed dual-gas sensor/controller built for the two most common gas compliance scenarios in commercial buildings: CO safety monitoring in spaces served by gas-fired RTUs (required by ASHRAE 62.1, IMC, and many state codes) and A2L and legacy refrigerant leak detection in VRF-served occupied spaces per ASHRAE 15 and the 2024 IMC. The SenvaSync app allows for consistent setup, even without power! Dual daisy-chainable 0–10V, 0–5V, or 4–20 mA outputs enable cost-effective coverage of large areas without additional controllers, or choose RS485 for BACnet MS/TP and Modbus RTU protocols. All models feature two independently configurable relays, an 85 dB audible alarm, tri-color LED status indication, and field-replaceable, factory-calibrated and certified sensing elements for quick, documented commissioning.

Applications

A2L and legacy refrigerant leak detection in VRF/VRV-served occupied spaces
- Hotels, multi-family, dormitories, and office buildings
- ASHRAE 15 and 2024 IMC compliance
CO safety monitoring in schools, gyms, and commercial buildings with gas-fired RTUs
- IMC, and state CO detection compliance
CO + NO₂ monitoring in enclosed parking garages
- IMC Section 404.1 compliance with UL2075 recognized components
Alert occupants of elevated gas levels
Directly VFD or exhaust fan control

Sort by:

Product		Price
TGR-AHX	TG, Recessed, Analog, Hydrogen	$924.28 / EA
TGR-B8X	TG, Recessed, BACnet/Modbus, R513A	$1,109.13 / EA
TGR-BHX	TG, Recesed, BACnet/Modbus, Hydrogen (H2)	$1,109.13 / EA
CALSHROUD-TGR	GAS SHROUD, TGR FOR CALIBRATION	$27.30 / EA
TGR-BNX	TG, Recesed, BACnet/Modbus, Nitrogen Dioxide (NO2)	$1,109.13 / EA
TGR-ANX	TG, Recessed, analog, Nitrogen Dioxide (NO2)	$924.28 / EA
TGR-BDX	TG, Recessed, BACnet/Modbus, Carbon Dioxide (CO2)	$1,016.71 / EA
TGS-2-ULV2	replacement sensor, R22A TGUL V2, for TG purchased after 2/1/22	$338.92 / EA
TGS-3-ULV2	REPLACEMENT SENSOR, R134A TGUL V2, for TG purchased after 2/1/22	$338.92 / EA
TGS-4-ULV2	replacement sensor, R410A (multi-gas) TGUL V2, for TG purchased after 2/1/22	$338.92 / EA

Type	Title
Technical Reference	TG UL Sensor Placement and Coverage Area
Technical Reference	Refrigerant cross sensitivities
Technical Reference	Understanding Cross-Sensitivities
Technical Reference	TGR PRODUCT RELEASE ANNOUNCEMENT
Videos	TGR Introduction
Videos	Calibrating the Recessed Toxic Gas Sensor (TGR)
Manual	TGR Install Manual
Technical Reference	TGR Modbus Guide
Technical Reference	TGR BACnet Guide
Technical Reference	153-0063-0A TGR Senva Sync App Interface Guide
Technical Reference	TGR Field Calibration Guide
Technical Reference	Toxic Gas Recessed - TGR for VRF Applications
Certifications	Senva Commerce Declaration - BABAA TAA ARRA 2026
Product Data	TGR Indoor Dual Toxic Gas.pdf
Warning: The datasheet is designed for reference only. Refer to installation instructions that accompany the product and heed all safety instructions. Product improvement is a continuing process at Senva. Changes may occur to products without prior notice.

All prices shown are excluding tax unless otherwise specified.

has been added to your cart. This product requires 2 PWT sensors to operate.
Please add 2 PWT sensors to your cart.

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Power Supply	Comms	16-30VDC/24VAC(1), 5W max, 200mA max.
Power Supply	Analog	12-30VDC/24VAC(1), 5W max, 200mA max.
Wiring	Conductor	14-24 AWG, Minimum 600V, 75°C
Wiring	Terminal Torque	0.5 N•m
Outputs (Analog)	2 programmable outputs	0-10V, 0-5V, and 4-20mA(2) (selectable)
	CO Output Scaling	0-200ppm (default), 0-500ppm (menu selectable)
	NO2 Output Scaling	0-10ppm (default), 0-10ppm (menu selectable)
	CO2 Output Scaling	0-10,00ppm (default), 0-10,00ppm (menu selectable)
	Propane/Methane/Hydrogen Output Scaling	0-50% LEL (default), 0-50% LEL (Menu Selectable)
	Oxygen Output Scaling	0-25% Vol (default), 0-25% Vol (menu selectable)
	Refrigerant Output Scaling	0-1000ppm (default), 0-1000ppm (menu selectable)
	H2S Output Scaling	0-100ppm (default), 0-100ppm (menu selectable)
	Ammonia NH3 Output Scaling	0-100ppm (default), 0-100ppm (menu selectable)
	Temp Output Scaling (optional)	20 to 85°C
BACnet /Modbus	Protocol RS-48	BACnet MS/TP, Modbus RTU
	Baud Rates	9600, 19200, 38400, 57600, 76800, 115200
	RS-485	1/4 unit
Trouble Relay	Trouble Relay characteristics	N.C. 1A@24VAC/30VDC (50/60Hz) (no mains connection)
Alarm Relay	Alarm relay characteristics	N.O. 1A@24VAC/30VDC (50/60Hz) (no mains connection)
LED	Green, Yellow, Red	Green = Normal, Yellow = Warning, Red = Alarm
Audible Alarm Exposure	85dB Piezo transducer	30 minutes above alarm setpoint per UL2075; tamper-proof silence/reset button (menu selectable)
CO Sensor Performance	Type	Electrochemical
	Accuracy	±5% of default range(3) ±5%of reading above 200ppm
	Resolution	1ppm
	Certifications	UL2075 Listed Component
	Life expectancy	>7 years
	Recommended Calibration	Annual
	Recommended Height	3 to 6 feet; coverage 5000-7500 sq ft.
NO2 Sensor Performance	Type	Electrochemical
	Accuracy	±5% of default range(4) ±5%of reading above 20ppm
	Resolution	0.1ppm
	Life expectancy	>7 years
	Recommended Calibration	Annual
	Recommended Height	3 to 6 feet; coverage 5000-7500 sq ft.
Carbon Dioxide (CO2)	Type	Non-Dispersive Infrared (NDIR)
	Accuracy (5)	±(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
	Drift with ABC disabled (6)	35ppm/month (6) (Standard) 5ppm/month (6) (Dual Channel)
	Range	0-2000/5000ppm; Programmable up to 10,000ppm
	Response time	30 s
	Sample rate	1 s
	Recommended Height	3 to 6 feet; coverage 5000-7500 sq ft.
	Resolution	1 ppm
	Life expectancy	15 years
Methane/Propane/Hydrogen Sensors Performance	Type	Catalytic
	Detection Range	0-50% LEL (Lower Explosive Limit)
	Accuracy	5% of range
	Resolution	1%LEL
	Life expectancy	>5 years
	Recommended Calibration	Bump test annually, calibrate or replace if necessary ⁽¹²⁾
	Recommended Height	Hydrogen/Methane: 0.5 to 1 foot from ceiling; coverage 5000-7500 sq ft Propane: 1-3 ft. above finished floor, coverage area 5000 sq. ft.
Oxygen Sensor Performance	Type	Electrochemical
	Detection Range	0-25% Volume
	Accuracy	±5% of range
	Resolution	0.1%
	Life expectancy	5 years
	Recommended Calibration	Annual
	Recommended Height	3 to 6 feet; coverage 5000-7500 sq ft
H2S Sensor Performance	Type	Electrochemical
	Detection Range	0-100 ppm
	Accuracy	±5% of range
	Resolution	1 ppm
	Life expectancy	5 years
	Recommended Calibration	6 months
	Recommended Height	3 to 6 feet; coverage 5000-7500 sq ft
Ammonia Sensor Performance	Type	Electrochemical
	Accuracy	±5% of range
	Resolution	0.1 ppm
	Life expectancy	5 years
	Recommended Calibration	6 months
	Recommended Height	0.5 to 1 foot from ceiling; coverage 5000-7500 sq ft
Refrigerant Sensor Performance	Type	Electrochemical
	Detection Range	0-25% Volume
	Resolution	1 ppm
	R134A Sensitivity (6)	@300ppm test gas: 450 ppm R410A, 425 ppm R407C, 400 ppm R404A, 370 ppm R22, 300 ppm R134A
	Other detectable gases (8)	R407A, R407F, R427A, R507, R448A, R422A, R422D, R452A, R514A
	Life expectancy	>10 years (typical life expectancy for MOS sensors)
	Recommended Calibration	6 months
	Recommended Height	6 inches above floor; no more than 18 inches above lowest level of equipment location for leak detection; coverage 5000-7500 sq ft.
	Max Elevation (9)	2629 m (8625 ft)
Operating Environment	Temperature, continuous	-20 to 50°C
	Humidity	15-90% continuous, 0-99% intermittent
	Max Elevation	2000m
Enclosure	Material	ABS/Polycarbonate
	Dimensions	5.7”h x 3.0” x 1.8”d
	Rating	IP20
Agency	Compliance	RoHS

TGR Series

TGR Sensor/Controller | A2L Refrigerant + CO Detection Higher Reliability, Faster Installation, Superior Accuracy | Sense the Difference

TGR Sensor/Controller | A2L Refrigerant + CO Detection
Higher Reliability, Faster Installation, Superior Accuracy | Sense the Difference