TWI-TXX: Loop-Powered Two-Wire Thermocouple to 4-20mA Converter/Isolator
Function:
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.
Specifications:
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)
