RS485 High Temperature Compressed Air Natural Gas Digital Oxygen Thermal Mass Flowmeter

The thermal  mass flow meter is an instrument for measuring gas flow by using the principle of thermal diffusion. It  measure gas mass directly and  also  it  needn't  temperature and  pressure compensation.

The thermal mass flow meter sensor part is composed of two reference platinum resistance temperature sensors (RTDS),  one is the speed sensor RH, and the other is the temperature sensor RMG, which measures the temperature change of the gas. When the two RTDS are placed in the measured gas, one sensor RH is heated and the other sensor RMG is used to sense the measured gas temperature. As the gas flow rate increases, the airflow carries away more heat, and the temperature of the sensor RH drops. The temperature difference between the two RTDS is linearly related to the flow rate, and then this relationship is converted into a linear output through micro-electronic control technology, thus to realise the measurement of gas flow.

Installation Tips

1. When installing the instrument, it should be far away from elbows, obstacles, irregular diameters, and valves to ensure a stable flow field. it requires a long straight pipe, with the upstream straight pipe length greater than 10xD and the downstream straight pipe length greater than 5xD.
2. When the site cannot meet the requirements of the straight pipeline, the gas rectifier can be connected in series to greatly reduce the requirements of the straight pipe section.
3. If the flow meter is installed outdoors, the meter shade should be added to avoid the sun and rain.
4. Do not install in strong vibration and contain a lot of corrosive gas environment.
5. Do not share the power supply with the equipment that pollutes the power supply such as the frequency converter and welding machine, and if necessary, install the purified power supply for the instrument.
6. Before installation, please reconfirm the connection method of the pipe segment and prepare flange connection related items such as gaskets and bolts. Production must be stopped before installation, and the relevant regulations of the factory must be strictly observed.