Gas Detection Sensors, Transmitters, and Controllers

Choose the right gas and detection range for your application: CO and NO₂ for parking garages, CH₄ (natural gas) for boiler rooms, or CO₂ and specialty gases for labs and loading docks. Then pair it with a sensor or transmitter that offers the outputs your job requires, such as relays or 4–20 mA / 0–10 V signals.

These systems can be networked to a central controller for automatic fan or alarm activation, with options for visual and audible alerts. Many models integrate directly into your BAS for smarter ventilation control and code compliance.

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Showing 49–90 of 90 resultsSorted by popularity

E3 Point Propane Replacement Sensor Cartridge

Honeywell Home

SKU: E3P
$460.51
MSRP: $529.59
You save 15%
Honeywell Analytics E3P E3 Point Propane Sensor Cartridge quantity
E3 Point Oxygen (O2) Replacement Sensor Cartridge

Honeywell Home

SKU: E3O2
$405.39
MSRP: $466.20
You save 15%
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E3 Point Hydrogen (H2) Replacement Sensor Cartridge

Honeywell Home

SKU: E3H2
$460.51
MSRP: $529.59
You save 15%
Honeywell Analytics E3H2 E3 Point Hydrogen (H2) Sensor Cartridge quantity
CH4 50% LEL Air Balance 103 Liter Calibration Gas Cylinder

Honeywell Home

SKU: 998-022-001
$603.43
MSRP: $693.94
You save 13%
Honeywell Analytics 998-022-001 CH4 50% LEL Air Balance 103L Calibration Gas quantity
Remote Panel with 3-24VDC Outputs and 4 Relay Outputs

Honeywell Home

SKU: 301-EMRP
$1,099.34
MSRP: $1,264.24
You save 15%
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Wall Mount Gas Detection Controller with Outputs

Honeywell Home

SKU: 301-EM-US3
$2,197.64
MSRP: $2,527.29
You save 15%
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Gas Detection Controller with Horn and Strobe, Type 3 US

Honeywell Home

SKU: 301-EM-RFSA-US3
$2,805.34
MSRP: $3,226.14
You save 15%
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301C Controller with Datalogger, ABS Polycarbonate Enclosure

Honeywell Home

SKU: 301-C-DLC
$2,436.30
MSRP: $2,801.75
You save 15%
Honeywell Analytics 301-C-DLC 301C Controller with Datalogger, ABS Polycarbonate Enclosure quantity
301C Gas Detection Controller, ABS Polycarbonate Enclosure

Honeywell Home

SKU: 301-C
$2,436.30
MSRP: $2,801.75
You save 15%
Honeywell Analytics 301-C 301C Controller, ABS Polycarbonate Enclosure quantity
705 High Temp Combustible Sensor, 150°C, 3/4″ NPT, UL Approved

Honeywell Home

SKU: 00705-A-1735
$1,535.34
MSRP: $1,765.64
You save 15%
Honeywell Analytics 00705-A-1735 705 High Temp Combustible Sensor 150°C 3/4" NPT UL quantity
705 Combustible Gas Sensor, Aluminum, Cat Bead, 0–100% LEL

Honeywell Home

SKU: 00705-A-1733
$1,054.61
MSRP: $1,212.80
You save 15%
Honeywell Analytics 00705-A-1733 705 Combustible Gas Sensor, Aluminum, Cat Bead (SG16B), 0–100% LEL quantity
A2L Refrigerant Sensor with 96″ Lead Wire

York

SKU: S1-025-54126-000
$176.74
MSRP: $203.25
You save 15%
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A2L Refrigerant Detection System

York

SKU: S1-2AC06700124
$218.43
MSRP: $251.19
You save 15%
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Carrier Replacement Gas Sensor for HVAC Systems

Carrier

SKU: 11201003000364
$231.80
MSRP: $266.57
You save 15%
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Gas Sensor for Carrier HVAC Systems

Carrier

SKU: 11201003000344
$354.06
MSRP: $407.17
You save 15%
Carrier 11201003000344 Gas Sensor quantity
Gas Sensor Replacement Component

Bosch HVAC

SKU: 8733971028
$140.68
MSRP: $161.78
You save 13%
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A2L Refrigerant Leak Sensor for Bosch Systems

Bosch HVAC

SKU: 8733968186
$121.50
MSRP: $139.73
You save 15%
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Hydrogen Electrochemical Sensor, 0-1000 PPM, NEMA 4X Enclosure

QEL

SKU: Q5-H2-1000P-0-A
$1,189.07
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Calibration Cap Kit Adapter For Q5/B5/Q6/B6

QEL

SKU: 85930-006-000

$126.16Add to Cart for Savings

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Nitrogen Dioxide NO2 Gas Detection Sensor

QEL

SKU: Q5-NO2-10P-0-A

$615.04Add to Cart for Savings

Q5-NO2-10P-0-A QEL Nitrogen Dioxide NO2 Gas Detection Sensor quantity
Gas Monitor, 0-10 PPM Detection Range, 2 SPDT Aux Outputs

Belimo

SKU: 22G0214-5B
$808.26
MSRP: $929.50
You save 13%
Belimo 22G0214-5B Gas Monitor 0-10 PPM with 2 SPDT Auxiliary Outputs quantity
Gas Monitor for CO and NO with Auxiliary Output

Belimo

SKU: 22G0214-5A
$882.26
MSRP: $1,014.60
You save 13%
Belimo 22G0214-5A Gas Monitor for CO and NO with Auxiliary Output quantity
Gas Monitor for Reliable Gas Detection & Safety

Belimo

SKU: 22G02-5B
$548.82
MSRP: $631.14
You save 15%
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CO Gas Monitor with CAN Bus BACnet Communication

Belimo

SKU: 22G02-5A
$615.56
MSRP: $707.89
You save 13%
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CO2 sensor for precise indoor air quality monitoring

AAON

SKU: V57760
$1,545.99
MSRP: $1,777.89
You save 15%
Aaon V57760 CO2 Sensor quantity
CO sensor, 0–250 ppm range, 3 SPDT relays, NEMA 4X enclosure

ACI

SKU: 141036
$840.99
MSRP: $967.14
You save 15%
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Smart Sensor replacement CO module, 0–250 ppm detection range

ACI

SKU: 134488
$280.99
MSRP: $323.14
You save 15%
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CO2 sensor, 0–2000 ppm range, dual 0-10VDC & 4-20mA outputs

ACI

SKU: 130079
$345.99
MSRP: $397.89
You save 15%
ACI 130079 CO2 Sensor 0-2000 ppm with 0-10VDC & 4-20mA Output quantity
CO sensor, 0–125 ppm range, dual 4-20mA & 2-10VDC outputs

ACI

SKU: 107556
$591.23
MSRP: $703.16
You save 16%
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Carbon Monoxide Smart Sensor Replacement, 0–250 PPM, Q5/B5 & Q6/B6

QEL

SKU: 85930-918-001
$196.81
QEL 85930-018-001 Carbon Monoxide Smart Sensor Replacement, 0-250 PPM quantity
Gas Sensor, 0–5 / 0–10 VDC Output with Relay

Veris

SKU: GWNVXX
$188.88
MSRP: $217.21
You save 15%
Veris GWNVXX Gas Sensor, 0–5 / 0–10 VDC Output with Relay quantity
Smart Gas Transmitter B5-CO2-5000P-0-A B5 Carbon Dioxide, Infrared, 0-5000PPM

QEL

SKU: B5-CO2-5000P-0-A

$1,107.07Add to Cart for Savings

QEL B5-CO2-5000P-0-A – Carbon Dioxide Infrared 0–5000 ppm Smart Gas Transmitter quantity
QEL

SKU: IO-BOX-0
$328.02
QEL IO-BOX-0 – DIN Rail Mounting Box for Q-Controller Modules quantity
QEL BI-BOX-0 4 Channel Relay Input Module For Q-Controller

QEL

SKU: BI-BOX-0
$328.02
QEL BI-BOX-0 4 Channel Relay Input Module For Q-Controller quantity
M-Switch – Remote Switch for M-Controller or Q4C Controller

QEL

SKU: M-SWITCH-0
$328.02
QEL M-Switch – Remote Switch for M-Controller or Q4C Controller quantity
QEL M-Strobe Multifunctional LED Beacon/Sounder Alarm For Gas Detection & Alarm Systems

QEL

SKU: M-STROBE

$442.83Add to Cart for Savings

QEL M-Strobe – Multifunctional LED Beacon/Sounder Alarm for Gas Detection quantity
M-Relay for M-Controller Series Relay Module w/ 8 DPDT Relays

QEL

SKU: M-RELAY-5A-8000000
$385.42
QEL M-Relay – Relay Module with 8 DPDT Relays for M-Controller Series quantity
QEL M-Controller Series Universal 40 Sensor Digital-Analog Controller (3 x DPDT, 5 A Relays) w/ 8 Channel Analog Output Card

QEL

SKU: M-CONTROLLERA-T000000
$1,540.00
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QEL M-Controller Series Universal 40 Sensor Digital-Analog Controller (3 x DPDT, 5 A Relays)

QEL

SKU: M-CONTROLLERA-0N00000
$1,851.08
Read more
AO-BOX-0 8 Channel Analog Output Module For Q-Controller

QEL

SKU: AO-BOX-0
$328.02
QEL AO-BOX-0 8-Channel Analog Output Module For Q-Controller quantity
QEL BO-BOX-0 4 Channel Relay Output Module For Q-Controller

QEL

SKU: BO-BOX-0
$328.02
QEL BO-BOX-0 – 4-Channel Relay Output Module for Q-Controller quantity
QEL Gas Detector Annunciator Panel for M-Controller

QEL

SKU: M-ANNUNCIATOR
$380.50
QEL Gas Detctor Annunciator Panel for M-Controller quantity

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