Possible Malfunctions and Cause Analysis of Combustible Gas Detectors
Gas detectors are widely used in enterprises and households. They are readily available on the market, yet malfunctions may occur during operation. Many minor faults can be fixed by users themselves, but lack of basic knowledge often forces people to seek professional maintenance support. Common faults and repair notes for combustible‑gas detectors are described below.
Possible malfunctions and root‑cause analysis of combustible‑gas detectors: ① No display after power‑on Faulty membrane switch; broken battery lead wire; extremely low battery voltage.
② Minus sign only on power‑on; no readings after pressing "voltage" key Fault of regulated power supply or short‑circuit on its output side.
③ Only decimal point displayed after power‑on Damaged sensor element or cold‑solder joint of certain component in bridge circuit.
④ No alarm upon concentration over‑limit Damaged buzzer; open circuit in alarm circuit.
⑤ Cannot calibrate accuracy to standard‑gas sample Heavy dust accumulation on explosion‑proof cover; sensor aging.
Repair requirements for combustible‑gas detectors: ① Unauthorized disassembly is prohibited. Maintenance shall be performed by trained professional personnel only. ② Do not disassemble for repair underground when a fault occurs on site. ‑ Sensors and battery packs are special explosion‑proof components. Damaged units must be replaced with original spare parts supplied by the manufacturer; substitution with other components is not allowed.
With knowledge of the above‑mentioned fault analysis and repair points, users can handle simple troubleshooting instead of relying entirely on external service personnel.
