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Featured 4 to 20ma signal products
TPSA Precision High Pressure Transducer - High pressure transducer for pressure testing applications with pressure ranges from 0...4 bar (60 psi) up to 0...1000 bar (15,000 psi) gauge with a measurement accuracy of 0.1%. 
Air classification system powder duct pressure transmitter with +/-15 kPa range and ATEX/IECEx IS cert - This pressure transmitter with open port design is ideal for monitoring duct pressures in powder air classification systems. It features ATEX/IECEx IS certification and a -15 to +15 kPa range.
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User Guide
This tool will calculate the voltage drop created by adding a shunt resistor to a 4-20mA current loop signal circuit in order to cause a voltage drop across the resistor which can be used as a measurable voltage output, since it will be proportional to the current loop signal.
The answer mode can also be switched to calculating the 4-20mA current signal or the shunt resistance.
Formulas
The formulas used by this to 4-20 mA supply, load, shunt and signal calculator to determine each individual parameter are as follows:
Vout = I4-20mA · Rshunt
Rshunt = Vout / I4-20mA
I4-20mA = Vout / Rshunt
Symbols
- Rshunt = Load/Shunt resistance
- Vout = Voltage output
- I4-20mA = Current signal
Parameters
Current Loop Signal (I4-20mA)
This is the current signal in the loop circuit in milliamps (mA) controlled by the transmitter to provide a measurement signal range of 4 to 20 mA.
Shunt Resistance (Rshunt)
This is the total resistance measured in ohms (Ω) of the shunt resistor(s) added to the circuit to create a voltage drop which is used to provide a voltage output proportional to the current signal.
Voltage Output (Vout)
This is the resulting voltage output that is measured across the the shunt resistance, which is added in series to the current loop circuit.
Featured 4 to 20ma signal products
Dirty water, sludge & sewerage tank level 400 mbar pressure sensor - Flush ceramic diaphragm pressure sensor for measuring level of a dirty water, sludge & sewerage tank.- Air classification system powder duct pressure transmitter with +/-15 kPa range and ATEX/IECEx IS cert - This pressure transmitter with open port design is ideal for monitoring duct pressures in powder air classification systems. It features ATEX/IECEx IS certification and a -15 to +15 kPa range.