Yokogawa CA450 process multimeter/calibration instrument

The Yokogawa CA450 process multimeter is an on-site measuring instrument that provides the functionality of a digital multimeter for basic measurements such as voltage, current and resistance, and also acts as a calibrator for electrical and process measurements.

With functions for repair, maintenance and troubleshooting of plant equipment, the device accomplishes tasks that have traditionally required two on-site measuring instruments.

The true RMS digital multimeter has a basic measurement and generator accuracy of 0.05% and dedicated sensor modes for direct inputs from sensors such as AC/DC clamp probes. It also incorporates several process-related features including loop-check and 4-20 mA output generation and measurement functions.

The loop-check function, designed for tests on 2-wire transmitters, supplies 24 VDC to the transmitter and measures the DC output in mA to an accuracy of 0.05% up to 30 mA. A transmitter simulator function allows transmitter I/O to be checked by ‘sinking’ designated currents from the external voltage generators of the instrumentation. The 4-20 mA generator output includes span, step, auto-step and sweep capabilities.

The CA450 can also be used to carry out operating checks and adjustments on valve positioners, response testing using the auto-step function, and tests for hunting, sticking/slipping and valve open/close errors. Controller programs can also be verified using the CA450’s 4-20 mA step generation function.

Electrical measurements include power supply peak-to-peak measurement with instantaneous detection in the DC-voltage measurement mode, and AC/DC current measurement up to 180 A AC and 3000 A AC in sensor mode. The CA450 can also check panel meters for correct connection, reproducibility and errors.

The CA450 features a safe design with current terminal shutters that conforms to the 600 V CAT IV and 1000 V CAT III standards to protect both operator and instrument against incorrect connection. An optional adaptor enables connection with a PC to transfer data via infrared USB interface.