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Formulas

Instrumentation control engineering formulas used in industrial control systems and field instruments like 4-20mA and 3-15 PSI conversions.

Temperature Transmitter Formula

Calculate Temperature Transmitter Output

An electronic  temperature transmitter is ranged  50 to 140 degrees  Fahrenheit and  has  a 4-20 mA output  signal.   Calculate  the 

Flow Transmitter Output Current Calculation

Calculate Flow Transmitter Output Current

A flow transmitter is ranged 0 to 350 GPM, 4-20 mA output, direct-responding. Calculate Flow Transmitter Output 4-20mA Current for 204 GPM.

Control valve positioner calculation

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

4-20 mA Conversion Formulas

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?

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

Convert-Linear-%-to-Square-root-%

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

Process-Variable-to-Percentage-Conversion

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

Current-to-Percentage-Conversion

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’s Lower Range Value

Percentage-to-Process-Variable-Conversion

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

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