How to prevent interference of vortex flowmeter

2020-09-25
There are two main reasons for the interference of the vortex flowmeter signal: electromagnetic interference and
mechanical vibration interference.  So how to solve these two kinds of anti-interference?
 
1. The piezoelectric crystal of the vortex flowmeter is mounted on the bluff body structure, and one end of the
piezoelectric crystal is connected to the shell, so the signal preamplifier must be grounded.
2. The output signal of the vortex flowmeter is sent to the secondary instrument, and the DC power required for
signal amplification is provided by the secondary instrument. 
There may be a step voltage between the ground wire of the piezoelectric crystal and the ground wire of the secondary
meter to form a current. When this current flows through the ground wire of the signal amplifier, there will be a voltage drop. 
This voltage drop is superimposed on the effective signal and cannot be separated, which is ground current interference.
3. The solution to the interference of the ground wire of the vortex flowmeter is to reduce or eliminate the ground wire current.
A better way is to isolate the DC power supply from the secondary meter. That is, the DC power supply is isolated by a transformer
and then rectified into a DC supply vortex flowmeter, so that there is no electrical connection between the ground wire of the
secondary instrument and the ground wire of the piezoelectric crystal.


share:

Pre:Installation requirement of metal tube rotameter
Next:Back To List