Vapor recovery monitor

The system installs flowmeter in front of the vacuum pump and behind the vapor recovery separator in the return pipeline of the vapor recovery device. When it works, the flowmeter measures the flowrate of return air and generates a signal 485. The data acquisition unit will collect and convert it into cumulative flow, meanwhile, it will measure the vacuum pump and calculate the average flowrate. What’s more , it can also read the fueling pulse signal of the fuel dispenser and convert it into the corresponding liquid volume and flowrate. The ratio of return air volume to liquid volume is the air to liquid ratio in the process of vapor recovery. Install differential pressure transmitter to the lower end of unloading vapor collection port or the pressure vacuum valve of the vent-pipe to measure the pressure of tank. The output analog signal will be collected and converted by data acquisition module. According to the range of regular fluctuations of the pressure value in the process of vapor recovery, and the falling rate and number of the pressure value in the static state, it is determined whether the dynamic back pressure and airtightness indicators of the pipeline meet the requirements, so as to check whether the vapor recovery device is working normally .