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Frequency Input Isolating, Field Configurable Two-Wire Transmitter
T773

Provides an Isolated Current Loop in Proportion to a Frequency Input

  • Eliminates Ground Loops
  • Digitally-Synthesized, Field Configurable, Switch Selectable Ranges (105Hz to 18kHz)
  • Wide Ranging Zero (30%) and Span (80%) Adjustability
  • Direct Magnetic Pickup Input
  • Velocity/Flow Applications
  • Protects Equipment with 1000VRMS Isolation
  • Three Year Warranty
  • Datasheet
 

The T773 offers the user a choice of 5 input ranges and 2 output ranges, which are field selectable via top-accessed DIP switches (see Table 1). The T773 isolating two-wire transmitter 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. A major advantage of the T773 is its truly wide-ranging capability. The T773 enables 30% zero turn-up and 80% spanturn-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 factor 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).

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