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Action TRANSPAK™ T761 AC Input Isolating Field Configurable Two-Wire Transmitter

Provides an Isolated Current Loop in Proportion to an AC Input.

  • Field Configurable Input Ranges
  • Eliminates Ground Loops
  • Wide Ranging Zero and Span Adjustability
  • 600V Input-to-Output Isolation



The T761 has 12 widely adjustable input ranges and 2 output ranges, all of which are field selectable via top-accessed DIP switches. The T761 provides 600 VDC of isolation with outputs of either 4-20mA or 10-50mA. The current outputs are in proportion to selected AC voltage or current input.

The T761 measures the average value of the AC input signal and is calibrated for sine wave signals over a frequency range of 20Hz to 3KHz. For other wave forms, the calibration may be different, but the T761 will remain linear for the same wave form. For example, if the unit is calibrated using a square wave, the calibration will be valid for all square wave inputs in that range. The maximum DC component of the input signal is 50% of the range (e.g., 75VDC is half of a 0-150VAC range).

The T761 has 80% zero and span adjustability within most user- selected input ranges. For example, Range 3 of Table 1 specifies 0 to 25V with a minimum span of 5V (25V-5V = 20V, or 80%). This 80% adjustability allows the user to field calibrate the unit from the maximum (0 to 25V) down to any minimum (5V) span (e.g. 10V to15V) as long as that adjusted span remains within the selected 0 to 25V range.

The T761 is useful in any application requiring the isolation of a 2- wire loop current from an AC signal source. Typical applications include AC motor status and energy management. The output of the T761 can be used to drive a digital meter for direct display or interface with a computer for monitoring and control.

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CTH Controls Inc.   CTH Controls Inc.
5100 South Service Road, Unit 2
Burlington, ON. L7L 6A5 Canada
Phone: 905-792-6829
Toll Free: 1-888-550-6829
Fax: 905-792-6902
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