5B Signal Conditioning Module - Isolated True RMS Input, 0A to 1Arms Input, 4mA to 20mA Output

Each C5B 33 True RMS input module provides a single channel of AC input which is converted to its True RMS DC value, filtered, isolated, amplified, and converted to a standard process voltage or current output.

The C5B 33 modules are designed with a completely isolated computer-side circuit which can be floated to ±50V from Power Common (pin 16). This complete isolation means that no connection is required between I/O Common and Power Common for proper operation of the output switch. If desired, the output switch can be turned on continuously by simply connecting pin 22, the Read-Enable pin, to I/O Common (pin 19).

The field voltage or current input signal is processed through a pre-amplifier and RMS converter on the field side of the isolation barrier. The converted DC signal is then chopped by a proprietary chopper circuit and transferred across the transformer isolation barrier, suppressing transmission of common mode spikes and surges. The computer-side circuitry reconstructs, filters, and converts the signal to industry-standard outputs. Modules are powered from ±5VDC (±5%).

For current output models, an external loop supply is required, having a compliance voltage of 14 to 48VDC. The loop supply connection, with series load, is between pin 20 (+) and pin 19 (-).