What is the measurement principle of Shandong miniature thermal mass flow meter?
Release time：
21 Dec,2022
Summary
Shandong miniature thermal mass flow meters use thermal measurement to measure flow rate by the molecular mass carried away by split molecules. Because it is a thermal measurement, the measurement results are not affected by changes in gas temperature and pressure. The Shandong miniature thermal mass flow meter is an accurate, fast, reliable, stable, and flexible flow measurement instrument that will be widely used in petroleum processing, chemical industry, and other fields. It is believed that it will show great potential in promoting flow measurement.
The Shandong miniature thermal mass flow meter cannot control the flow rate; it can only detect the mass flow rate of liquids or gases, outputting the flow rate value through analog voltage, current, or serial communication. However, a mass flow controller is an instrument that can detect and control simultaneously. In addition to the measurement part, the mass flow controller itself also has an electromagnetic regulating valve or a piezoelectric valve, making the mass flow controller itself a closed-loop system for controlling the mass flow rate of the fluid. The setpoint of the flow controller can be set by analog voltage, analog current, or computer or PLC.
How to handle the failure of Shandong miniature thermal mass flow meter?
1. Hardware failure. If the error is too large, the integrator display is not lit or increases, and the display is blank, the reasons are as follows:
A. Non-standard installation of the Shandong miniature thermal mass flow meter will directly lead to zero drift of the flow meter. For example, the Shandong miniature thermal mass flow meter is installed near the pump outlet, the sensor support strength is insufficient, improper welding of the connecting flange produces stress signals, and the cable is subjected to electromagnetic interference, etc.
B. Wiring problems. If the display is not lit, check the power connection of the integrator. If the fuse of the Shandong miniature thermal mass flow meter is blown, confirm whether the input voltage is consistent with the rated value and AC/DC form of the standard voltage. If the accumulator does not increase with the flow rate, check the accumulator wiring. If the accumulator is equipped with a forward/reverse program, check the flow meter wiring. Incorrect flow meter wiring will prevent the accumulator from increasing reverse flow.
C. Changes in process media. When there is gas retention, gasification, or two-phase flow in the measured medium, the transmitter will alarm and display, and the sensor will stop working in severe cases.
D. Transmitter failure.
E. Sensor failure.
F. Pipeline purging problems.
2. Software problems. Before installing and using a newly calibrated Shandong miniature thermal mass flow meter, it is necessary to pay attention to the zero-point calibration under the current operating conditions. We need to ensure that the flow meter is filled with the medium and close the shut-off valves at both ends before zero-point calibration. There are many specific methods, such as panel operation and manual operation.
A. Incorrect zero-point calibration. B. Incorrect parameter settings. C. Pulse fluctuation of the power supply. D. Incorrect I/O configuration. E. Incorrect operation.
What are the main characteristics of the Shandong miniature thermal mass flow meter?
1. The Shandong miniature thermal mass flow meter is suitable for various media. 2. High measurement accuracy. 3. No straight pipe section requirement. 4. Good reliability. 5. Low maintenance rate. 6. With a core processor.
More News
Tel: 400 006 6550
Office Address: 12F, Building I, International Innovation Park,
177 Songling Road, Laoshan District, Qingdao, Shandong, China