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Replacement Combustible and & Toxic Sensors for the 301EM Controllers
| Part Number | Sensor Description |
| 129570-L3 | Combustible sensor - (GAIN 1.0-1.3 / Methane) |
| 129426-L3 | Combustible sensor - (GAIN 1.3-1.599 / Hydrogen) |
| 129427-L3 | Combustible sensor - (GAIN 1.6-1.999 / Propane, Ethanol) |
| 129428-L3 | Combustible sensor - (GAIN 2.0-2.219 / n-Pentane) |
| 129429-L3 | Combustible sensor - (GAIN 2.220-2.5 / Toluene) |
| 129430-L3 | Combustible sensor - (GAIN +2.5 / n-Decane) |
| 129431-L3 | Carbon monoxide (CO) sensor |
| 129435-L3 | Chlorine (Cl2) sensor |
| 129432-L3 | Nitrogen dioxide (NO2) sensor |
| 129433-L3 | Hydrogen sulfide (H2S) sensor |
| 129436-L3 | Oxygen (O2) sensor |
| 129434-L3 | Sulfur dioxide (SO2) sensor |