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1. CURRENT TRANSDUCER 4 TO 20MA OUTPUT FACTORY VERIFICATION
2. CURRENT TRANSDUCER 4 TO 20MA OUTPUT FACTORY SERIES

In order to perform error-free testing of the 4-20mA current signal, it is important to get it done by industry experts. If the reading is not between the expected ranges then calibration is required.īy using these two techniques, the 4-20mA current loop signals can be tested before troubleshooting or performance analysis of a smart transmitter like Rosemount pressure transmitter. Note the mA reading, which is expected to be between 4mA and 20mA.

CURRENT TRANSDUCER 4 TO 20MA OUTPUT FACTORY SERIES

Select the DC measurement function before connecting.ĭisconnect one end of the measuring signal leads, and connect a multimeter or a loop calibrator in series with the transmitter circuit. Uncover the transmitter to reveal the two-wire loop circuit.Ĭonnect the measuring ends of the two-wire loop with the mA measured. The following steps are taken to measure the signal by this method.Įxamine the operation of the pressure transmitter before starting the measurement.

If the value lies in the range, the transmitter performance is assured.Ĥ-20mA Signal Measurement using Loop Calibrator or Multimeter: The 4-20mA signals can be tested by using a multimeter or a loop calibrator by interrupting or breaking the two-wire current loop. If the reading does not show between 4-20mA, then troubleshooting and calibration are required. The value of mA output must be in the range of 4mA to 20mA. Identify the mA output signals at zero value of the process clamp meter. Uncover the transmitter in order to gain access to the two-wire current loop and signal wires.Ĭonnect the process clamp meter to signal wires. The following are the two methods of measuring a 4-20mA current loop signal utilized by industrial professionals.Ī 4-20mA Signal Measurement Using Process Clamp Meter: The following steps are taken in order to measure 4-20mA current loop signals without breaking the two-wire circuit. Methods of 4-20mA Current Loop Output/Signal Measurement There are two methods of measuring 4-20mA current loop output, as discussed further. By using this scale, the performance configurations are set by the operators.

CURRENT TRANSDUCER 4 TO 20MA OUTPUT FACTORY VERIFICATION

Verification of 4-20mA current loop signals is a crucial step in the calibration and troubleshooting of a pressure transmitter. Normally, at the zero-level output, the transmitter displays a 4mA signal output whereas, at the maximum or full-scale output, a 20mA signal is displayed on the reading scale. The output of the transmitter is sensed based on HART protocol, however, it is converted into the proportional current in order to display it as a reading. The 4-20mA signal is a converted value of output generated by a pressure transmitter. The Importance of 4-20mA Current Loop Output Signal in Pressure Transmitters This post discusses two ways of testing the 4-20mA current output for a pressure transmitter.īefore getting to the testing methods, let us discuss the significance of the 4-20mA current loop output. Therefore, the testing and troubleshooting of a 4-20mA signal output must be learned by the operator. This scale is essential in examining the performance abilities of the pressure transmitters. The circuit includes an electronic 2-wire system with 4-20mA current loop output. The modern process parameter control instruments like Rosemount pressure transmitter work on highway addressable remote transducer i.e. A 4-20mA current loop output or signal is a standard scale of testing and troubleshooting the industrial process control or monitoring devices like pressure transmitters, flowmeters, etc.