TWI-FRX-TB: Loop-Powered Two-Wire Frequency to 4-20mA Converter/Isolator
Function:
The TWI-FRX-TB is an isolated two wire frequency transmitter that provides high isolation from the
frequency input to the 4-20 mA output. The small package and its DIN rail mount make it easy for
the TWI-FRX-TB to be incorporated into larger control panels. There it may have applications such
PLC front end conditioning. etc.
Seven standard frequency input ranges are available to choose from that cover frequencies as low
as 70 Hz up to 8KHz. The Input can be either 0-100 VAC, 0-5VDC (TTL), or an optical coupler input.
An adjustable threshhold allows a lower threshhold to be set for background noise immunity.
Specifications:
Isolation: Input to Output to Power 800 VAC (test)
Operating Power (from Output Loop): 8-60 VDC
Input Impedance: 10 KOhm
Output: 4-20 mA
Accuracy/Linearity: +/-0.25% max., +/-0.1% typ.
Response Time: 250 msec to 63% of final value, 900 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)
Line Effects: +/-0.03% pet 10 VDC Line Change (calibrated for 24 VDC)
