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Replacement Sensors

Did you know sensors for gas monitors have a lifespan? Gas monitors are made to last for years, but old sensors can mean false readings and faulty equipment. Luckily for you, most gas monitors have field replaceable sensors making it easy to keep your devices running. Apollo Safety has replacement sensors for the most popular single and multi-gas monitors on the market. 

Prices are subject to change without notice due to ongoing tariff adjustments and market conditions. For the most accurate and up-to-date pricing, please contact us directly.

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Sensor, Ammonia (NH3), 0 - 500 ppm, CT-7 style, non explosion proof
Sensor, Ammonia (NH3), 0 - 500 ppm, CT-7 style, non explosion proof
SKU: 65-2302-NH3-5
$765.00
In Stock
Sensor, Ammonia (NH3), 0 - 75 ppm, CT-7 style with j-box, non explosion proof
Sensor, Ammonia (NH3), 0 - 75 ppm, CT-7 style with j-box, non explosion proof
SKU: 65-2303-NH3-75
$890.00
In Stock
Sensor, Ammonia (NH3), 0 - 75 ppm, CT-7 style, non explosion proof
Sensor, Ammonia (NH3), 0 - 75 ppm, CT-7 style, non explosion proof
SKU: 65-2302-NH3-75
$765.00
In Stock
Sensor, Ammonia (NH3), 0 - 75 ppm, ESM-01 plug-in type
Sensor, Ammonia (NH3), 0 - 75 ppm, ESM-01 plug-in type
SKU: ESM-01R-NH3
$210.00
In Stock
Sensor, Ammonia (NH3), 0 - 75 ppm, ESM-01 plug-in type, for diffusion instruments
Sensor, Ammonia (NH3), 0 - 75 ppm, ESM-01 plug-in type, for diffusion instruments
SKU: ESM-01R-D-NH3
$210.00
In Stock
Sensor, Ammonia (NH3), 0-400 ppm for GX-6000 / GX-6100
Sensor, Ammonia (NH3), 0-400 ppm for GX-6000 / GX-6100
SKU: ESS-B332-NH3
$275.00
In Stock
Sensor, Ammonia (NH3), 0-75 ppm, for GD-K88Ai, GD-K71D, GD-K77D, and SC-8000
Sensor, Ammonia (NH3), 0-75 ppm, for GD-K88Ai, GD-K71D, GD-K77D, and SC-8000
SKU: ESM-23R-NH3
$505.00
In Stock
Sensor, Ammonia (NH3), 0-75 ppm, for GD-K88Ai, GD-K71D, GD-K77D, and SC-8000, high humidity use
Sensor, Ammonia (NH3), 0-75 ppm, for GD-K88Ai, GD-K71D, GD-K77D, and SC-8000, high humidity use
SKU: ESM-23RH-NH3
$505.00
In Stock
Sensor, Ammonia (NH3), 0-75 ppm, sensor/amp unit for GD-70D
Sensor, Ammonia (NH3), 0-75 ppm, sensor/amp unit for GD-70D
SKU: ESU-23R-NH3
$525.00
In Stock
Sensor, Ammonia (NH3), 0-75.0 ppm, F sensor package, for 9000 Series and Eagle 3
Sensor, Ammonia (NH3), 0-75.0 ppm, F sensor package, for 9000 Series and Eagle 3
SKU: ESF-B242-NH3
$525.00
In Stock
Sensor, Arsine (AsH3) 0 - 0.20 ppm range or 0 - 1.00 ppm range
Sensor, Arsine (AsH3) 0 - 0.20 ppm range or 0 - 1.00 ppm range
SKU: ES-23AHS-ASH3
$485.00
In Stock
Sensor, Arsine (AsH3) 0 - 1 ppm, EC type
Sensor, Arsine (AsH3) 0 - 1 ppm, EC type
SKU: 66-0068
$990.00
In Stock
Sensor, Arsine (AsH3) sensor, 0 - 1.5 ppm, direct connection with conduit mounting, non explosion proof (no transmitter, no j-box)
Sensor, Arsine (AsH3) sensor, 0 - 1.5 ppm, direct connection with conduit mounting, non explosion proof (no transmitter, no j-box)
SKU: 65-2300RK-ASH3
$610.00
In Stock
Sensor, Arsine (AsH3) sensor, 0 - 1.5 ppm, direct connection, non explosion proof with j-box (no transmitter)
Sensor, Arsine (AsH3) sensor, 0 - 1.5 ppm, direct connection, non explosion proof with j-box (no transmitter)
SKU: 65-2301RK-ASH3
$740.00
In Stock
Sensor, Arsine (AsH3), 0 - 1.50 ppm, ESM-01 plug-in type
Sensor, Arsine (AsH3), 0 - 1.50 ppm, ESM-01 plug-in type
SKU: ESM-01DH-ASH3
$210.00
In Stock
Sensor, Arsine (AsH3), 0-0.2 ppm, for GD-K88Ai, GD-K71D, GD-K77D, and SC-8000
Sensor, Arsine (AsH3), 0-0.2 ppm, for GD-K88Ai, GD-K71D, GD-K77D, and SC-8000
SKU: ESM-23AHS-ASH3
$505.00
In Stock
Sensor, Arsine (AsH3), 0-0.20 ppm, sensor/amp unit for GD-70D
Sensor, Arsine (AsH3), 0-0.20 ppm, sensor/amp unit for GD-70D
SKU: ESU-C23F-ASH3
$525.00
In Stock
Sensor, Arsine (AsH3), 0-1.0 ppm, for GD-K88Ai, GD-K71D, GD-K77D, and SC-8000
Sensor, Arsine (AsH3), 0-1.0 ppm, for GD-K88Ai, GD-K71D, GD-K77D, and SC-8000
SKU: ESM-23AH-ASH3
$505.00
In Stock
Sensor, Arsine (AsH3), 0-50 ppb, sensor/amp unit for GD-70D
Sensor, Arsine (AsH3), 0-50 ppb, sensor/amp unit for GD-70D
SKU: ESU-C23F-S-ASH3
$945.00
In Stock
Sensor, Bromine (Br2) 0 - 1.00 ppm range
Sensor, Bromine (Br2) 0 - 1.00 ppm range
SKU: ES-K233-BR2
$485.00
In Stock
Sensor, Bromine (Br2), 0-1.0 ppm, sensor/amp unit for GD-70D
Sensor, Bromine (Br2), 0-1.0 ppm, sensor/amp unit for GD-70D
SKU: ESU-K233-BR2
$525.00
In Stock
Sensor, BTBAS (C8H22NSi),0-15.00 PPM,for GD-70D
Sensor, BTBAS (C8H22NSi),0-15.00 PPM,for GD-70D
SKU: ESU-23RVM-BTBAS
$525.00
In Stock
Sensor, BTBAS, 0 - 15 ppm
Sensor, BTBAS, 0 - 15 ppm
SKU: ES-23RV-BTBAS
$485.00
In Stock
Sensor, Butadiene (C4H6), 0-100% LEL, IRF-1332, for SD-3
Sensor, Butadiene (C4H6), 0-100% LEL, IRF-1332, for SD-3
SKU: IRF-1332-BUT
$885.00
In Stock
Sensor, Carbon Dioxide (CO2) , 0-20%, IRF-4443, for 9000 Series and Eagle 3
Sensor, Carbon Dioxide (CO2) , 0-20%, IRF-4443, for 9000 Series and Eagle 3
SKU: IRF-4443
$885.00
In Stock
Sensor, Carbon Dioxide (CO2) 0 - 100%, IR, explosion proof direct connection (no transmitter, no j-box), cULus version
Sensor, Carbon Dioxide (CO2) 0 - 100%, IR, explosion proof direct connection (no transmitter, no j-box), cULus version
SKU: 61-0191RK-10
$775.00
In Stock
Sensor, Carbon Dioxide (CO2) 0 - 5 % volume, IR type
Sensor, Carbon Dioxide (CO2) 0 - 5 % volume, IR type
SKU: 66-0050
$990.00
In Stock
Sensor, Carbon Dioxide (CO2) 0 - 5,000 ppm, IR, explosion proof direct connection (no transmitter, no j-box), cULus version
Sensor, Carbon Dioxide (CO2) 0 - 5,000 ppm, IR, explosion proof direct connection (no transmitter, no j-box), cULus version
SKU: 61-0191RK-02
$775.00
In Stock
Sensor, Carbon Dioxide (CO2) 0 - 5%, IR, explosion proof direct connection (no transmitter, no j-box), cULus version
Sensor, Carbon Dioxide (CO2) 0 - 5%, IR, explosion proof direct connection (no transmitter, no j-box), cULus version
SKU: 61-0191RK-03
$775.00
In Stock
Sensor, Carbon Dioxide (CO2) 0 - 5%, LPIR type
Sensor, Carbon Dioxide (CO2) 0 - 5%, LPIR type
SKU: 66-0067
$880.00
In Stock
Sensor, Carbon Dioxide (CO2) 0 - 50%, IR, explosion proof direct connection (no transmitter, no j-box), cULus version
Sensor, Carbon Dioxide (CO2) 0 - 50%, IR, explosion proof direct connection (no transmitter, no j-box), cULus version
SKU: 61-0191RK-05
$775.00
In Stock
Sensor, Carbon Dioxide (CO2) 0 - 5000 ppm, IR type
Sensor, Carbon Dioxide (CO2) 0 - 5000 ppm, IR type
SKU: 66-0054
$990.00
In Stock
Sensor, Carbon Dioxide (CO2), 0-10,000 ppm for GX-3R Pro
Sensor, Carbon Dioxide (CO2), 0-10,000 ppm for GX-3R Pro
SKU: IRR-0433
$420.00
In Stock
Sensor, Carbon Dioxide (CO2), 0-10,000 ppm, IRF-1433, for SD-3
Sensor, Carbon Dioxide (CO2), 0-10,000 ppm, IRF-1433, for SD-3
SKU: IRF-1433-CDTK
$885.00
In Stock
Sensor, Carbon Dioxide (CO2), 0-10% vol., IRF-1439, for SD-3
Sensor, Carbon Dioxide (CO2), 0-10% vol., IRF-1439, for SD-3
SKU: IRF-1439-CDTV
$885.00
In Stock
Sensor, Carbon Dioxide (CO2), 0-10% volume for GX-3R Pro
Sensor, Carbon Dioxide (CO2), 0-10% volume for GX-3R Pro
SKU: IRR-0409
$420.00
In Stock
Sensor, Carbon Dioxide (CO2), 0-5000 ppm, IRF-1436, for SD-3
Sensor, Carbon Dioxide (CO2), 0-5000 ppm, IRF-1436, for SD-3
SKU: IRF-1436-CD5K
$885.00
In Stock
Sensor, Carbon Dioxide, 0-2% vol., IRF-1437, for SD-3
Sensor, Carbon Dioxide, 0-2% vol., IRF-1437, for SD-3
SKU: IRF-1437-CD2V
$885.00
In Stock
Sensor, Carbon Dioxide, 0-5% vol., IRF-1438, for SD-3
Sensor, Carbon Dioxide, 0-5% vol., IRF-1438, for SD-3
SKU: IRF-1438-CD5V
$885.00
In Stock
Sensor, Carbon Monoxide (CO) (ES-031), GX-94 / GX-8000
Sensor, Carbon Monoxide (CO) (ES-031), GX-94 / GX-8000
SKU: 65-2008RK
$183.00
In Stock
Sensor, Carbon Monoxide (CO) 0 - 300 ppm, direct connect, non explosion proof, with j-box
Sensor, Carbon Monoxide (CO) 0 - 300 ppm, direct connect, non explosion proof, with j-box
SKU: 65-2499RK
$480.00
In Stock
Sensor, Carbon Monoxide (CO) 0 - 300 ppm, non explosion proof direct connect, no j-box
Sensor, Carbon Monoxide (CO) 0 - 300 ppm, non explosion proof direct connect, no j-box
SKU: 65-2496RK
$355.00
In Stock
Sensor, Carbon Monoxide (CO) 0 - 300 ppm, plug-in type, CT-7 style, cCSAus version
Sensor, Carbon Monoxide (CO) 0 - 300 ppm, plug-in type, CT-7 style, cCSAus version
SKU: ES-1531-CO
$205.00
In Stock
Sensor, Carbon Monoxide (CO) 0-2000 ppm for GX-3R / GX-3R Pro / GX-Force / GasWatch 3 / 04 Series / GX-6100 / GX-9000
Sensor, Carbon Monoxide (CO) 0-2000 ppm for GX-3R / GX-3R Pro / GX-Force / GasWatch 3 / 04 Series / GX-6100 / GX-9000
SKU: ESR-A13P-CO
$160.00
In Stock
Sensor, Carbon Monoxide (CO) 0-2000 ppm with H2 compensation for GX-3R / GX-3R Pro / GX-Force / GasWatch 3 / 04 Series / GX-6100
Sensor, Carbon Monoxide (CO) 0-2000 ppm with H2 compensation for GX-3R / GX-3R Pro / GX-Force / GasWatch 3 / 04 Series / GX-6100
SKU: ESR-A1CP-CO-H
$255.00
In Stock
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