Function:
The OTC-22 provides high isolation from Input to Output in a small, easy to install package. The
universal DIN rail mount often makes it possible to install the OTC-22 right next to the instrument
that is to be isolated.
The OTC-22 is optically isolated to eliminate all electrical interference from input to output. Two-wire
inputs and outputs require no external power to be applied to the OTC-22. The unit simply uses the
existing power in the 4-20mA input & output loops. This makes it very easy to retrofit existing installations
that show signal instability due to ground loops etc.
These properties make the OTC-22 ideal for front-end interfacing on PLC’s that have two-wire
inputs only. The OTC-22 essentially acts like a two-wire transmitter on the PLC side (OTC-22 output)
and like a standard load on the transmitter side (OTC-22 input).
Specifications:
Isolation: 1500 VAC Input to Output to Power (Test)
Power: Loop-Powered (8.7V min. Required in 4-20mA loops)
Accuracy/Linearity: +/-0.1% max., +/- 0.05% typ.
Common Mode Rejection.: at 60 Hz = 120 dB
Response Time: 1 msec to 99% of final value
Temperature Effects: +/- 0.2% max., +/-0.1% typ. (for 50 Deg. C. change)
