﻿ Instrumentation and Control Formulas - Instrumentation Tools

## Calculate Control Valve Stem Position

An electronic  loop controller  outputs  a signal of 8.55 mA to a direct-responding control valve (where 4 mA is shut and

## Standard 4 to 20 mA Conversion Formula

A 4 to 20 mA current signal represents a 0 to 100 percent scale. Usually, this scale is linear, as

## How is Pressure Drop Calculated through a Valve ?

The pressure drop across a valve is related to the flow rate passing through it, i.e. the greater the flow

## Formula for Linear mA to Square root mA conversion

This formula used to convert transmitter Linear ma to Square root ma conversion.Calculating the equivalent Square root ma for any

## Formula for Linear % to Square root % conversion

This formula used to convert transmitter Linear Percentage to Square root Percentage conversion. Calculating the equivalent Square root Percentage for

## Formula for Process Variable to Percentage Conversion

Calculate the equivalent Percentage for any given Process variable. For conversion, we need transmitter Lower Range Value and Upper Range

## Formula for Current 4-20ma to Percentage Conversion

Calculate the equivalent Percentage for any given current signal 4 to 20 mA. For conversion, we need transmitter Lower Range Value

## Formula for Percentage to Process Variable Conversion

Calculate the equivalent Process Variable for any given percentage of signal ( 0 to 100%). We need Transmitter Span, Lower

## Formula to Calculate 4-20ma from Percentage

Calculate the equivalent 4-20 mA loop current value for any given percentage of signal. We need field transmitter span, lower

## Formulas to calculate mA from PV, LRV and URV

The formula for calculating equivalent current (ma) from known process variable (PV), Lower range value (LRV) and Upper range value