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Description

Function :

To convert input signal into galvanically & optically isolated signal linearly proportional to the input. 4-Wire Transmitter has two wires for Power Supply & the other two for 4-20 mA output. The output signal is generally 4-20 mA. DC Voltage OR frequency output is available optionally.



Various Types of 4-Wire Signal Converters depending upon Input Signal :

  1. V DC to mA converter
  2. mV DC to mA converter
  3. mA DC to mA converter
  4. micro Amp DC to mA converter
  5. AC current to mA converter
  6. V AC to mA converter
  7. Speed / Pulse Transmitter
  8. Line Frequency to mA converter
  9. R (Resistance)/Potentiometer to mA converter
  10. RTD Transmitter with Lead Length Compensation
  11. Load Cell Signal Transmitter with Tare adjustment facility
  12. Thermocouple Transmitter with Ambient Temperature Compensation
  13. Customer specific converters like signal adder, signal multiplier etc.


NOTE: Multiple outputs (Dual, Triple, 4 channel) available on specific request.
Units suitable for accepting multiple inputs available optionally.


  Provides immunity from line drops & interference signal.
  Galvanic as well as Optical isolation is provided between Input, Output & Supply.
  Different types of input signals.
  Cold Junction Compensation is provided for Thermocouple input and Lead Length Compensation is provided for RTD input.
  Dual or Triple or Quad channel outputs are available for specific models.
  Converters suitable for multirange potentiometric inputs are available.
  Unit with output clamping facility available for specific applications.
  Intrinsically safe Speed Transmitter available.
  Cast Aluminium or ABS / Polycarbonate, IP-65 grade, Enclosure suitable for field mounting or Thermoplastic suitable for DIN Rail / Panel Mounting.


Supply Voltage : 110V AC or 230V AC or 110V AC/230V AC (selectable) or 24V DC or Customer Specific
Input : Refer ordering information for Input signal Type
Output : 4-20 mA or 0-20 mA or V DC (0-5V or 0-10V) or Frequency or mA & Vdc (mixed)
For mA output RL =500Ω typically & For voltage output IL = 10mA typically. Higher loading capacity available optionally
Accuracy : Better than 0.5% of F.S. (Excluding accuracy of external sensor)
Zero and Span Adjustment : With10 turn trimpot
For Standard Signals: Zero +/-10% & Span +/- 20% (Wider Zero and Span available if required)
For Potentiometric signal: Zero 30% & Span +/- 30%
Display (Optional) : 4 Digit, ½", 7-Segment LED Display (not available for DIN Rail mounting model)
Isolation : Output is galvanically & optically isolated from Supply, input & body to the level of 2 kV peak
Enclosure : Cast Aluminium or
ABS / Polycarbonate, IP-65 Grade, suitable for field mounting or
Thermoplastic suitable for DIN Rail / Panel mounting

*Technical Specifications are subject to change without prior notice


The output of the signal converter is used for the transmission of the signal from the field to the remotely located C.C.R. or vice versa, for the purpose of Indication, Control, Data logging etc.