TWI-RTX: Loop-Powered Two-Wire RTD to 4-20mA Converter/Isolator
Function:
The TWI-RTX is an isolated two wire RTD transmitter in a small, easy to install package. It has easily
accessible screw terminals and is built in a rugged housing. The many different temperature ranges allow
it to be used in a great variety of temperature measurement applications.
Specifications:
Isolation: Input to Output to Power 800 VAC (test)
Operating Power (from Output Loop): 12-60 VDC
RTD Type: Platinum, 100 Ohms at 0 Deg.C., 0.00385 Alpha
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 milliohm/Ohm offset per Deg.C. or 1 milliohm/Deg.C., whichever is greater
Line Effects: 0.03% per 10 VDC Line Change (calibrated for 24 VDC)
