Industry new

Compressed air flow measuring instrument selection reference description

Compressed air is an important secondary energy source for enterprises and institutions. Most of them are converted by electric energy or thermal energy through a compressor. In this case, the accuracy of air flow measurement is particularly high, and most of them are equipped with automatic adjustment. For the problem of the selection of compressed air flow meters, it is a very cautious thing. In order to achieve the correct selection of the on-site process, we must first understand the nature of the on-site process fluid, and only on the basis of sufficient understanding can we make a correct judgment on the selection. Let us first understand the characteristics of compressed air flow measurement:
1. Large vibration
2. Gas with water
3. Pulsating flow
Throttle differential pressure flowmeters (such as our common orifice flowmeters and V-cone flowmeters) have a long history in air flow measurement. In the context of the emergence of novel flowmeters, throttled differential pressure flowmeters despite It has the disadvantages of narrow range, troublesome installation and maintenance, and large pressure loss, but it is still the preferred instrument for high reliability, good stability and strong anti-interference ability in the compressor room and blower room with obvious vibration.
When measuring the air flow with a throttling differential pressure flowmeter, the most important thing is to deal with the water accumulated in the throttle, the water in the high and low pressure chambers in the transmitter and the water in the pressure pipeline.
Firstly, the method of solving the water accumulation in front of the throttle member is to install the throttle member on the vertical pipe, or to use a non-standard round hole plate and an eccentric hole plate. Among them, the eccentric orifice plate has less uncertainty and is superior to the circular orifice plate. Secondly, the temporary method of clearing the water in the signal tube is to sweep the line, and rely on the gas with sufficient pressure in the process tube to flush the accumulated water out of the tube.

PREVIOUS：Differential pressure transmitter output is tNEXT：Ultrasonic flowmeter use notes note