4-20mA Signal Isolators combine Surge Protector to reduce Space and Cost

Omniflex has introduced three innovative new signal isolators in the Omniterm LZ series, with integrated surge protection to cater for applications that require both isolation and surge protection.

Installations that are vulnerable to surges need both isolation and surge protection on field connected current loops, which up to now required the deployment of two separate devices to be fitted to the field loop.  The LZ series combines both functions in under 12mm per channel.

The OMNITERM LZI and LZD are current loop interface modules designed to interface field mounted transmitters in remote applications such as interfacing for RTUs and PLCs. The LZI is a single channel device with additional flexibility and support for both 2-wire and 4-wire 420 mA transmitters. The LZD is a dual channel device for increased packing density suitable for multiple 2-wire transmitters.

In addition, the LZ series incorporates a stabilised 24Volt loop supply for the field mounted two-wire current transmitters, allowing supply voltages in the range 10-30Vdc to be used. This benefits RTU applications which often run on 12V batteries, and creating 24Volts for instrumentation can be inconvenient and costly.

The OMNITERM LZB is a dual input field contact interface module designed to protect RTU and PLC installations from external factors such as lightning surges, ground loops and wiring faults. This module includes a fully specified surge arrestor and a high side output driver allowing users to combine all these functions into a single module.

These modules utilise advanced electronic techniques to achieve high accuracy and low power consumption with zero field calibration, saving on installation and commissioning time. Reliability figures in accordance with IEC61508 (SIL1) are available to allow inclusion of these devices in safety systems.

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