20mA MTL7796 MTL Intrinsically Safe Barriers , 2 Wire MTL Zener Barrier

MTL7796- MTL Instruments Intrinsically Safe Zener Barriers

Product type : Zener Barriers

Analogue inputs (high level)

2-wire transmitters, 4/20mA, conventional and smart

The recommended barrier for use with 'conventional' and 'smart' 4/20mA transmitters (fed by a 26V regulated supply) is the MTL7787+.

This provides up to 12.9V (14.6V for MTL7787P+) at Vwkg and 20mA for a transmitter and its lines as well as 5V for the typical 250O load.

This application and this barrier is suitable for use with the optional power bus facility.

The MTL7706+ is recommended for applications where an unregulated supply of up to 35V is used. It provides 16.0V for conventional and smart transmitters at 20mA, as well as 5V for a typical 250O load.

With the MTL7706+ terminal 3 is negative with respect to earth, so the connections to terminals 3 and 4 should be reversed.

Vibration probes

The 3-wire transmitters used with vibration monitoring equipment are invariably supplied by a –24V dc power supply – hence the recommended barrier choice is the negatively-polarised MTL7796-.

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