MA:MFA130199 KA:KFA130037 ExdibI:320130874 patent ：ZL 2012 2 0543819.9
1. It’s a comprehensive tester to gas drainage pump and pipe.
2. Measure, display, store, query CH4 concentration, negative pressure, differential pressure, pipe absolute pressure and pump absolute pressure, efficiency, power parameter.
3. It’s significant to gas drainage system safety inspection and maintenance, gas accident prevention, productivity improve, environment protect, resource utilization.