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Action TRANSPAK™ T773 Frequency Input, Isolating Field Configurable Two-Wire Transmitter

Provides an Isolated Current Loop in Proportion to a Frequency Input.

  • Digitally-Synthesized, Field Configurable Ranges (105Hz to 18kHz)
  • Eliminates Ground Loops
  • Wide Ranging Zero and Span Adjustability
  • Direct Magnetic Pickup Input
  • Protects Equipment with 1000VRMS Isolation



The T773 isolating two-wire transmitter has 5 input ranges and 2 output ranges, all of which are field selectable via top-accessed DIP switches. The T773 can accept square, triangle or pulse waveforms up to 18KHz with amplitudes from 10mVrms to 35V peak-to-peak. The T773 provides 1000Vrms of transformer- coupled isolation with outputs of either 4-20mA or 10-50mA. Current outputs are in proportion to a selected frequency input.

The T773 has 30% zero "turn-up" and 80% span "turn-down" adjustments within any user-selected input range. For example, Range 3 of Table 1 specifies 0 to 2100Hz with a minimum span of 420Hz (2100Hz - 420Hz = 1680Hz, or 80%). This 80% adjustability allows the user to field calibrate the unit for the maximum range of 0 to 2100Hz down to the minimum range of 0 to 420Hz. The maximum obtainable offset is 30% of the calibrated span: a calibrated range of 0 of 1000 Hz can be offset by 300Hz (e.g., 300Hz to 1000Hz).

The T773 is useful in any application requiring isolation of a 2-wire loop current from a pulse output transducer, such as a magnetic pickup or a turbine flowmeter. The output of the T773 can be used to drive a digital meter for direct display of flow or velocity, or to interface with a computer or PLC for monitoring and control applications.

The T773 is CSA approved for intrinsically safe operation in Class I, Division 1, Groups A, B, C and D hazardous locations when installed per manufacturing drawing number.

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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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