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Yokogawa’s CA450 process multimeter is an on-site instrument that, as well as offering voltage, current and resistance measurement, can also act as a calibrator for electrical and process measurement.

With specialised functions for repair, maintenance and troubleshooting of plant equipment, the CA450 is a single-unit, on-site measuring tool designed to reduce the engineering load and improve plant efficiency by accomplishing tasks that have traditionally required two on-site measuring instruments.

The CA450 is an RMS digital multimeter with a basic measurement and generator accuracy of 0.05 per cent and dedicated sensor modes for direct inputs from sensors such as AC/DC clamp probes.

In addition, it incorporates a number of process-related features including loop check and 4-20mA output generation and measurement functions.

With the loop-check function, designed for tests on two-wire transmitters, the CA450 supplies 24 VDC power to the transmitter and measures the DC output in milliamperes to an accuracy of 0.05 per cent up to 30mA.

A HART mode with loop power and 250ohm resistance allows HART and BRAIN communications to be tested.

A transmitter simulator function allows transmitter I/O to be checked by drawing in (‘sinking’) designated currents from the external voltage generators of the instrumentation.

The 4-20mA 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, including zero span adjustment, 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 4-20mA step-generation function, which switches between 4 and 20mA in 4mA output steps.

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 180A AC and 3000A AC in sensor mode.

The CA450 can also be used to check panel meters for correct connection, reproducibility and errors.

The CA450 features a safe design with current terminal shutters to protect both the operator and the instrument against incorrect connection.

It conforms to the 600V CAT.4 and 1000V CAT.3 standards.

An optional adaptor allows the instrument to be linked with a PC, with data transferred via an infrared USB interface.

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