Underground pipeline leak detector

1. Main technical indicators and characteristics
Gas detection: suitable for natural gas, liquefied petroleum gas, and artificial coal gas
Sensitivity: better than 50ppm between 0 and 1000ppm; When 1-100% LEL, it is better than 1% LEL
Detection range: 0~1000ppm, 1-100% LEL (automatic)
Preheating time: 10 seconds
Response time: less than 10 seconds
Audio indication: The higher the buzzing frequency, the higher the concentration
Battery: 12V rechargeable lithium-ion battery
Standby time: greater than 8h
Charging time: not less than 4 hours
Size and weight: 165 mm × 155 mm × 68 mm 1.3kg (including battery)
Working conditions: Temperature: -10 ° C~60 ° C Relative humidity: less than 95% (no condensation)
Environmental wind speed: less than 2m/s
Gas flow rate: 1L/min

Charger, probe, filter paper, needle probe, clock probe

2. Detection principle
When corrosive perforation and fracture occur in underground gas pipelines, trace gas leaks will inevitably occur and slowly spread in surface ditches, wells, sewers, and other places. When the leak detector sends air containing flammable gases to the sensor through an air pump, the resistance value of the detection element will rapidly change with the gas concentration (the magnitude of the resistance value change is proportional to the gas concentration), and at the same time, output a voltage signal, which is amplified by the circuit and processed by the microcontroller before being sent to the display part, and generate an alarm signal that changes with the concentration.