A gas meter test facility with multifunction

Based on the master meter principle and negative pressure method, a multifunctional facility is developed for gas meter testing. A high accuracy roots flowmeter and two wet gas meters are selected as master meters. A thermostat is applied to control gas temperature. This facility is suitable for type evaluation and verification of gas meters, such as testing their measurement performance, temperature adaptability, pressure loss, and overload flow rate. The expanded uncertainty of the facility is better than 0.3% (k = 2). Its applicable temperature range and flowrate range are (-40~60)°C and (0.016~16)m3/h respectively. Experimental results show that the proposed facility is effective in testing ultrasonic gas meter under different temperatures.