What is differential flow transmitter and what is working principle of pr differential flow transmitter and how to configuration and calibration full details

 


Differential Flow Transmitter Calibration.


A differential flow transmitter is a type of flow measurement device used to measure the flow rate of fluids, gases, or steam in a closed system. It measures the difference in pressure across an orifice plate, flow nozzle, or venturi tube, which is directly proportional to the flow rate of the fluid. This differential pressure is then converted into a proportional electronic signal, which is used to calculate the flow rate.


Working Principle:


The working principle of a differential flow transmitter is based on Bernoulli's principle, which states that the total energy of a fluid in a closed system is constant. When a fluid flows through an orifice plate, flow nozzle, or venturi tube, its velocity increases, and its pressure decreases. This pressure difference is measured by two pressure sensors, one upstream and one downstream of the flow obstruction.


The pressure sensors are connected to the differential flow transmitter, which amplifies the pressure difference signal and converts it into an electrical signal. The electrical signal is then transmitted to a control system, where it is used to calculate the flow rate of the fluid based on the characteristics of the flow obstruction.


Configuration and Calibration:


The configuration and calibration of a differential flow transmitter involves several steps, including:


1. Mounting and installation: The differential flow transmitter should be mounted in a location where it is easily accessible and can be easily removed for maintenance or calibration. It should also be installed in a location that is representative of the flow conditions.


2. Calibration: Before the differential flow transmitter can be used, it must be calibrated using a known flow rate. The calibration process involves adjusting the transmitter output signal to match the known flow rate.


3. Setting the range: The range of the differential flow transmitter should be set to match the expected flow rate range. This can be done by adjusting the input signal range and the output signal range.


4. Zero adjustment: The zero point of the differential flow transmitter should be adjusted to match the zero point of the flow meter. This can be done by adjusting the zero point calibration.


5. Output signal adjustment: The output signal of the differential flow transmitter should be adjusted to match the signal input of the control system. This can be done by adjusting the span calibration.


In conclusion, a differential flow transmitter is a highly accurate and reliable method of measuring the flow rate of fluids, gases, or steam in a closed system. Its working principle is based on the pressure difference created by a flow obstruction, and its configuration and calibration involve several steps to ensure accurate and reliable measurements. Proper installation, calibration, and maintenance are essential to ensure the differential flow transmitter performs accurately and reliably over its lifetime.

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