Description
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Manufacturer: MTL Instruments
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Product No. : MTL7796-
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Product type : Zener Barriers
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Analogue inputs (high level)
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2-wire transmitters, 4/20mA, conventional and smart
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The recommended barrier for use with 'conventional' and 'smart' 4/20mA transmitters (fed by a 26V regulated supply) is the MTL7787+.
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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.
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This application and this barrier is suitable for use with the optional power bus facility.
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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.
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With the MTL7706+ terminal 3 is negative with respect to earth, so the connections to terminals 3 and 4 should be reversed.
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Vibration probes
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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–.
