Below is a list of spare parts available for the Crowcon Sensitron SMART 3G-C2-LD Gas Detector:
| Sensor Part Number | Description | Detector |
| KX097ME | METHANE detector, 4-20 mA, 0-100% LFL | S2097ME |
| KX097GP | LPG detector, 4-20 mA, 0-100% LFL | S2097GP |
| KX097BU | BUTANE detector, 4-20 mA, 0-100% LFL | S2097BU |
| KX097PR | PROPANE detector, 4-20 mA, 0-100% LFL | S2097PR |
| KX097VB | PETROL VAPOURS detector, 4-20 mA, 0-100% LFL | S2097VB |
| KX097AA | ACETIC ACID detector, 4-20 mA, 0-100% LFL | S2097AA |
| KX097AT | ACETONE detector, 4-20 mA, 0-100% LFL | S2097AT |
| KX097AB | BUTYL ACETATE detector, 4-20 mA, 0-100% LFL | S2097AB |
| KX097BT | BUTYL ALCOHOL detector, 4-20 mA, 0-100% LFL | S2097BT |
| KX097CE | CYCLOHEXANE detector, 4-20 mA, 0-100% LFL | S2097CE |
| KX097CP | CYCLOPENTANE detector, 4-20 mA, 0-100% LFL | S2097CP |
| KX097EN | ETHANE detector, 4-20 mA, 0-100% LFL | S2097EN |
| KX097AE | ETHYL ACETATE detector, 4-20 mA, 0-100% LFL | S2097AE |
| KX097ET | ETHYL ALCOHOL detector, 4-20 mA, 0-100% LFL | S2097ET |
| KX097EE | ETHYL ETHER detector, 4-20 mA, 0-100% LFL | S2097EE |
| KX097EL | ETHYLENE detector, 4-20 mA, 0-100% LFL | S2097EL |
| KX097EP | HEPTANE detector, 4-20 mA, 0-100% LFL | S2097EP |
| KX097ES | HEXANE detector, 4-20 mA, 0-100% LFL | S2097ES |
| KX097H2 | HYDROGEN detector, 4-20 mA, 0-100% LFL | S2097H2 |
| KX097IB | ISO BUTANE detector, 4-20 mA, 0-100% LFL | S2097IB |
| KX097IT | ISO BUTYL ALCOHOL detector, 4-20 mA, 0-100% LFL | S2097IT |
| KX097IN | ISO PENTANE detector, 4-20 mA, 0-100% LFL | S2097IN |
| KX097IP | ISO PROPYL ALCOHOL detector, 4-20 mA, 0-100% LFL | S2097IP |
| KX097MT | METHYL ALCOHOL detector, 4-20 mA, 0-100% LFL | S2097MT |
| KX097MK | METHYL ETHYL KETONE detector, 4-20 mA, 0-100% LFL | S2097MK |
| KX097NN | NONANE detector, 4-20 mA, 0-100% LFL | S2097NN |
| KX097PE | PENTANE detector, 4-20 mA, 0-100% LFL | S2097PE |
| KX097PP | PROPYLENE detector, 4-20 mA, 0-100% LFL | S2097PP |
| KX097PN | PROPYL ALCOHOL detector, 4-20 mA, 0-100% LFL | S2097PN |
| KX097TM | TRI-METHYLBENZENE detector, 4-20 mA, 0-100% LFL | S2097TM |
| KX097TO | TOLUENE detector, 4-20 mA, 0-100% LFL | S2097TO |
| KX097XI | XYLENE detector, 4-20 mA, 0-100% LFL | S2097XI |
| KX151AC | ACETYLENE detector, 4-20 mA, 0-100% LFL | S2179AC |
| KX155AM | AMMONIA detector, 4-20 mA, 0-100% LFL | S2157AM |
| KX155BZ | BENZENE detector, 4-20 mA, 0-100% LFL | S2157BZ |
| KX155OE | ETHYLENE OXIDE (ETO) detector, 4-20 mA, 0-100% LFL | S2157OE |
| KX154P8 | JP8 (JET PROPELLER) detector, 4-20 mA, 0-100% LFL | S2508P8 |
| KX155ST | STYRENE detector, 4-20 mA, 0-100% LFL | S2157ST |
| KX155AV | VINYL ACETATE detector, 4-20 mA, 0-100% LFL | S2157AV |
| KX624ME | METHANE detector, 4-20 mA, 0-100% LFL | S3912ME |
| KX654BU | BUTANE detector, 4-20 mA, 0-100% LFL | S2602BU |
| KX654PR | PROPANE detector, 4-20 mA, 0-100% LFL | S2602PR |
| KX654GP | LPG detector, 4-20 mA, 0-100% LFL | S2602GP |
| KX654AT | ACETONE detector, 4-20 mA, 0-100% LFL | S2602AT |
| KX654BN | BUTADIENE detector, 4-20 mA, 0-100% LFL | S2602BN |
| KX654CE | CYCLO HEXANE detector, 4-20 mA, 0-100% LFL | S2602CE |
| KX654DT | DIMETHYL ETHER detector, 4-20 mA, 0-100% LFL | S2602DT |
| KX654EN | ETHANE detector, 4-20 mA, 0-100% LFL | S2602EN |
| KX654AE | ETHYL ACETATE detector, 4-20 mA, 0-100% LFL | S2602AE |
| KX654ET | ETHYL ALCOHOL detector, 4-20 mA, 0-100% LFL | S2602ET |
| KX654EP | HEPTANE detector, 4-20 mA, 0-100% LFL | S2602EP |
| KX654ES | HEXANE detector, 4-20 mA, 0-100% LFL | S2602ES |
| KX654IB | ISO BUTANE detector, 4-20 mA, 0-100% LFL | S2602IB |
| KX654IL | ISOBUTYLENE detector, 4-20 mA, 0-100% LFL | S2602IL |
| KX654IP | ISO PROPYL ALCOHOL detector, 4-20 mA, 0-100% LFL | S2602IP |
| KX654PE | PENTANE detector, 4-20 mA, 0-100% LFL | S2602PE |
| KX654PP | PROPYLENE detector, 4-20 mA, 0-100% LFL | S2602PP |
| KX654DE | R152a DIFLUOROETHANE detector, 4-20 mA, 0-100% LFL | S2602DE |
| K4433R454B | R454B detector, 4-20 mA, 0-100% LFL | S4435R454B |
| K4827R454C | R454C detector, 4-20mA, 0-100% LFL | S4829R454C |
| K3425R32 | R32 DIFLUOROMETHANE detector, 4-20 mA, 0-100% LFL | S3427R32 |
| K3429R1234YF | R1234yf detector, 4-20 mA, 0-100% LFL | S3431R1234YF |
| K3433R1234ZE | R1234ze detector, 4-20 mA, 0-100% LFL | S3436R1234ZE |
| KX641O2 | OXYGEN (O2) detector, 0-25% Vol., 4-20 mA | S3911O2 |
| KX131CO | CARBON MONOXIDE (CO) detector, 0-500 ppm, 4-20 mA | S3514CO |
| KX586CO | CARBON MONOXIDE (CO) detector, 0-1000 ppm, 4-20 mA | S2992CO |
| KX225AM | AMMONIA (NH3) detector, 0-100 ppm, 4-20 mA | S3227AM |
| KX133AM | AMMONIA (NH3) detector, 0-200 ppm, 4-20 mA | S2165AM |
| KX135AM | AMMONIA (NH3) detector, 0-1000 ppm, 4-20 mA | S2167AM |
| K3229AM | AMMONIA (NH3) detector, 0-5000 ppm, 4-20 mA | S3231AM |
| KX137HS | HYDROGEN SULPHIDE (H2S) detector, 0-50 ppm, 4-20 mA | S2169HS |
| KX708HS | HYDROGEN SULPHIDE (H2S) detector, 0-100 ppm, 4-20 mA | S2873HS |
| KX145NO | NITRIC OXIDE (NO), 0-100 ppm, 4-20 mA | S2177NO |
| K3593H2 | HYDROGEN (H2) detector, 0-2000 ppm, 4-20 mA | S3313H2 |
| K4547H2 | HYDROGEN (H2) detector, 0-3000 ppm, 4-20 mA | S3395H2 |
| K3004SD | SULPHUR DIOXIDE (SO2) detector, 0-20 ppm, 4-20 mA | S3005SD |
| K3008ND | NITROGEN DIOXIDE (NO2) detector, 0-20 ppm, 4-20 mA | S3009ND |
| K3014CL | CHLORINE (CL2) detector, 0-20 ppm, 4-20 mA | S3015CL |
| KX444CO2 | CARBON DIOXIDE (CO2) detector, 0-5.000 ppm, 4-20 mA | S3763CO2 |
| KX651CO2 | CARBON DIOXIDE (CO2) detector, 0-2% Vol., 4-20 mA | S2634CO2 |
| KX652CO2 | CARBON DIOXIDE (CO2) detector, 0-5% Vol., 4-20 mA | S2635CO2 |
| KX445CO2 | CARBON DIOXIDE (CO2) detector, 0-30% Vol., 4-20 mA | S2449CO2 |
| KX630CO2 | CARBON DIOXIDE (CO2) detector, 0-100% Vol., 4-20 mA | S2636CO2 |
| K3944R32 | R32 detector, 0-2000 ppm, 4-20 mA | S3945R32 |
| K3596R134A | R134a detector, 0-2000 ppm, 4-20 mA | S3163R134A |
| K3599SF6 | SF6 detector, 0-2000 ppm, 4-20 mA | S3601SF6 |
| K3656R125 | R125 detector, 0-2000 ppm, 4-20 mA | S3661R125 |
| K3657R1234YF | R1234yf detector, 0-2000 ppm, 4-20 mA | S3662R1234YF |
| K3948R1234ZE | R1234ze detector, 0-2000 ppm, 4-20 mA | S3949R1234ZE |
| K3658R404A | R404A detector, 0-2000 ppm, 4-20 mA | S3663R404A |
| K3659R407A | R407A detector, 0-2000 ppm, 4-20 mA | S3917R407A |
| K3920R407F | R407F detector, 0-2000 ppm, 4-20 mA | S3664R407F |
| K3923R449A | R449 detector, 0-2000 ppm, 4-20 mA | S3924R449A |
| K3660R507A | R507A detector, 0-2000 ppm, 4-20 mA | S3665R507A |
| K3017R410A | R410A detector, 0-2000 ppm, 4-20 mA | S3673R410A |
| K3952R417A | R417A detector, 0-2000 ppm, 4-20 mA | S3953R417A |
| K3956R448 | R448 detector, 0-2000 ppm, 4-20 mA | S3957R448 |