News

News

/
/
/
What is small signal removal (PV cutoff%)of flow meter?
What is small signal removal (PV cutoff%)of flow meter?
Data: 2022-01-05 11:09

 

Small signal removal (PV cutoff%)

1. What is small signal removal?

Signals such as flow rate (such as differential pressure signal) often correspond to the actual value and will produce a series of very small values ​​(this is often due to interference or false signals caused by the high accuracy of the sensor or transmitter). This part of the signal can be obtained by removing this part of the signal. More meaningful values. This part of the work of removing the signal is called small signal removal. 

2. The significance and purpose of vortex flowmeter small signal removal
Some people say that the vortex flowmeter does not have zero drift, but when the flow signal is output with 4-20mA, because the analog circuit always has a certain amplitude of zero drift, it is necessary to set the small signal cut, and when the flow signal is output in pulse form A small signal cut must be set, why is this? From the principle of the vortex flowmeter, there is no zero drift in the vortex flowmeter. The reason is that when the flow rate is zero, there will be no vortex generated behind the vortex generator, so there is no pulse output. In fact, there is no need to reach zero flow rate, as long as the flow rate of the fluid is low to a certain value and the corresponding Reynolds number is less than the turbulent flow interval, the vortex will no longer be generated. Then why set up small signal cutoff? The reason is simple, that is, when the Reynolds number is very low, interference will take advantage of it, such as interference caused by pipeline vibration, interference caused by radio frequency, etc.

The small signal removal in the flow meter is a special need in the flow meter. This is to overcome the bad consequences caused by the small signal caused by various reasons. The mechanism of the small signal phenomenon generated by the flowmeter of different principles is also different. For flow meters of the same principle, due to differences in accuracy, meter quality, measured medium, site environment and installation conditions, the uncertainty of the zero point is also very different. The commissioning personnel should reasonably set the cut according to the specific requirements and specific conditions. point. The general principle is to choose a smaller cutoff value as far as possible on the premise of achieving the goal.

中国
韩国
韩国
韩国
韩国
韩国
这是描述信息

Professional manufacturer and exporter

of flowmeter equipment

这是描述信息

The Cross of  9th Avenue and 2th Longhai Road,  Longting District, Kaifeng City, Henan Province, China.

SEND US A MESSAGE

Verification Code
Chat Online

Email: aylin18738997440@aliyun.com     
WhatsApp: +86-18738997440

Copyright © 2020  Kaifeng Baite Flow Instrument Co., Ltd.     豫ICP备20019609号      SEO