TWI-TXX: Loop-Powered Two-Wire Thermocouple to 4-20mA Converter/Isolator specsheet 

  • High Input-Output-Power Isolation (800VAC Test)
  • Small Size - Fits Standard Explosion Proof Housing
  • Standard Ranges for 100 Ohm Platinum RTD's
  • Special Ranges Available
  • Industry Standard 4-20 mA Output
  • Loop-powered from Input Loop, no Additional Power Supply Required
  • Wide Operating Range (12 to 60 VDC)
  • High Noise Rejection
  • CSA and NRTL Approved (LR 51078)

The TWI-TXX is an isolated two wire thermocouple transmitter that comes in a small, explosion proof housing compatible package. It has easily accessible screw terminals and is built into a rugged housing.. The many different Thermocouple types and ranges allow it to be used in a great variety of temperature measurement applications.

Upscale protection is standard on all units unless downscale protection is specified.

  • Isolation: Input to Output to Power 800 VAC (test)
  • Operating Power (from Output Loop): 12-60 VDC
  • Input Impedance: 1 Meg Ohm min.
  • Output: 4-20 mA
  • Accuracy/Linearity: +/-0.25% max., +/-0.1% typ. (Linearized to RTD Curve)
  • Response Time: 100 msec to 63% of final value, 400 msec to 99% of final value
  • Operating Temperature: -20 Deg.C. to +50 Deg.C.
  • Temperature Effects: +/-0.25% max., +/-0.1% typ. (for 50 Deg.C. change)
  • Span Drift: 0.025% per Deg.C
  • Zero Drift: 1 uV/mV offset per Deg.C. or 1 Uv/Deg.C., whichever is greater
  • Line Effects: 0.03% per 10 VDC Line Change (calibrated for 24 VDC)