Here is a list of spare parts available for the Crowcon Sensitron SMART S-SS Gas Detector:
| Sensor Part Number | Description |
| S4003ME | METHANE sensor head, 0-100% LFL |
| S4003GP | LPG sensor head, 0-100% LFL |
| S4003PR | PROPANE sensor head, 0-100% LFL |
| S4003BU | BUTANE sensor head, 0-100% LFL |
| S4003VB | PETROL VAPOURS sensor head, 0-100% LFL |
| S4003AT | ACETONE sensor head, 0-100% LFL |
| S4037AC | ACETYLENE sensor head, 0-100% LFL |
| S4003AM | AMMONIA sensor head, 0-100% LFL |
| S4003CP | CYCLOPENTANE sensor head, 0-100% LFL |
| S4003EN | ETHANE sensor head, 0-100% LFL |
| S4003AE | ETHYL ACETATE sensor head, 0-100% LFL |
| S4003ET | ETHYL ALCOHOL sensor head, 0-100% LFL |
| S4003EL | ETHYLENE sensor head, 0-100% LFL |
| S4003EP | HEPTANE sensor head, 0-100% LFL |
| S4003ES | HEXANE sensor head, 0-100% LFL |
| S4003H2 | HYDROGEN sensor head, 0-100% LFL |
| S4003IB | ISO BUTANE sensor head, 0-100% LFL |
| S4002P8 | JP8 sensor head, 0-100% LFL |
| S4003MT | METHYL ALCOHOL sensor head, 0-100% LFL |
| S4003MK | METHYL ETHYL KETONE (MEK) sensor head, 0-100% LFL |
| S4003PE | PENTANE sensor head, 0-100% LFL |
| S4003PP | PROPYLENE sensor head, 0-100% LFL |
| S4003PN | PROPYL ALCOHOL sensor head, 0-100% LFL |
| S4003ST | STYRENE sensor head, 0-100% LFL |
| S4003TO | TOLUENE sensor head, 0-100% LFL |
| S4003XI | XYLENE sensor head, 0-100% LFL |
| S4019ME | METHANE sensor head, 0-100% LFL (full scale 4.4% vol) |
| S4001ME | METHANE sensor head, 0-100% LFL (full scale 5% vol) |
| S4004PR | PROPANE sensor head, 0-100% LFL |
| S4004BU | BUTANE sensor head, 0-100% LFL |
| S4004AT | ACETONE sensor head, 0-100% LFL |
| S4004BN | BUTADIENE sensor head, 0-100% LFL |
| S4004CE | CYCLO HEXANE sensor head, 0-100% LFL |
| S4004DT | DIMETHYL ETHER sensor head, 0-100% LFL |
| S4004EN | ETHANE sensor head, 0-100% LFL |
| S4004AE | ETHYL ACETATE sensor head, 0-100% LFL |
| S4004ET | ETHYL ALCOHOL sensor head, 0-100% LFL |
| S4004EP | HEPTANE sensor head, 0-100% LFL |
| S4004ES | HEXANE sensor head, 0-100% LFL |
| S4004IB | ISO BUTANE sensor head, 0-100% LFL |
| S4004IL | ISOBUTYLENE sensor head, 0-100% LFL |
| S4004IP | ISOPROPYL ALCOHOL sensor head, 0-100% LFL |
| S4004PE | PENTANE sensor head, 0-100% LFL |
| S4004PP | PROPYLENE sensor head, 0-100% LFL |
| S4004TO | TOLUENE sensor head, 0-100% LFL |
| S4004DE | R152a DIFLUOROETHANE sensor head, 0-100% LFL |
| S4157R454B | R454b sensor head, 0-100% LFL |
| S4065R32 | R32 DIFLUOROMETHANE sensor head, 0-100% LFL |
| S4066R1234YF | R1234yf sensor head, 0-100% LFL |
| S4067R1234ZE | R1234ze sensor head, 0-100% LFL |
| S4152R32 | R32 sensor head, 0-2000 ppm |
| S4026R134A | R134a sensor head, 0-2000 ppm |
| S4027SF6 | SF6 sensor head, 0-2000 ppm |
| S4031R125 | R125 sensor head, 0-2000 ppm |
| S4032R1234YF | R1234yf sensor head, 0-2000 ppm |
| S4153R1234ZE | R1234ze sensor head, 0-2000 ppm |
| S4033R404A | R404A sensor head, 0-2000 ppm |
| S4034R407A | R407A sensor head, 0-2000 ppm |
| S4034R407F | R407F sensor head, 0-2000 ppm |
| S4154R449A | R449A sensor head, 0-2000 ppm |
| S4035R507A | R507A sensor head, 0-2000 ppm |
| S4036R410A | R410A sensor head, 0-2000 ppm |
| S4155R417A | R417A sensor head, 0-2000 ppm |
| S4156R448 | R448 sensor head, 0-2000 ppm |
| S4015CO2 | CARBON DIOXIDE (CO2) sensor head, 0-2% Vol. |
| S4016CO2 | CARBON DIOXIDE (CO2) sensor head, 0-5% Vol. |
| S4017CO2 | CARBON DIOXIDE (CO2) sensor head, 0-30% Vol. |
| S4005O2 | OXYGEN (O2) sensor head, 0-25% Vol. |
| S4166CO | CARBON MONOXIDE (CO) sensor head, 0-100 ppm |
| S4006CO | CARBON MONOXIDE (CO) sensor head, 0-500 ppm |
| S4021CO | CARBON MONOXIDE (CO) sensor head, 0-1000 ppm |
| S4022AM | AMMONIA (NH3) sensor head, 0-100 ppm |
| S4007AM | AMMONIA (NH3) sensor head, 0-200 ppm |
| S4008AM | AMMONIA (NH3) sensor head, 0-1000 ppm |
| S4009HS | HYDROGEN SULPHIDE (H2S) sensor head, 0-50 ppm |
| S4028HS | HYDROGEN SULPHIDE (H2S) sensor head, 0-20 ppm |
| S4029HS | HYDROGEN SULPHIDE (H2S) sensor head, 0-100 ppm |
| S4010NO | NITRIC OXIDE (NO) sensor head, 0-100 ppm |
| S4089H2 | HYDROGEN (H2) sensor head, 0-1000 ppm |
| S4168H2 | HYDROGEN (H2) sensor head, 0-2000 ppm |
| S4169H2 | HYDROGEN (H2) sensor head, 0-3000 ppm |
| S4167IL | VOC sensor head, 0-20 ppm, Isobutylene |
| S4158IL | VOC sensor head, 0-200 ppm, Isobutylene |
| S4159IL | VOC sensor head, 0-2000 ppm, Isobutylene |
| S4075BZ | VOC sensor head, 0-10 ppm, Benzene |
| S4160BZ | VOC sensor head, 0-100 ppm, Benzene |
| S4161BZ | VOC sensor head, 0-1000 ppm, Benzene |
| S4075TO | VOC sensor head, 0-10 ppm, Toluene |
| S4160TO | VOC sensor head, 0-100 ppm, Toluene |
| S4161TO | VOC sensor head, 0-1000 ppm, Toluene |