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Featured 4 to 20ma signal products
DMK 331 Ceramic Diaphragm Industrial Pressure Transmitter - This pressure transmitter can be supplied with a PVDF process connector so that it can be used to measure the pressure of acids and other corrosive chemicals.
DPS200 HVAC Differential Pressure Transmitter - Differential air pressure sensor with a 10 volt or a 4-20mA output for building ventilation applications. Ranges from 0 to 6 mbar up to 0 to 1000 mbar.
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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
ATEX Approved Pressure Transmitters - Choose certified ATEX pressure transmitters for Zone 0, 1, and 2 environments. Essential for preventing ignition in refineries, chemical plants, and gas pipelines.
IWmAT 4-20mA Signal Input to Wireless Transmitter - Measure the current loop signal output from any 4 to 20 milliamp transmitter, and wirelessly transmit it to a wireless receiver hub