Function:
The TWI-22-TB (1992) is a loop powered current isolator which can be used in applications where
loop isolation is required but power is not available and/or space is limited. The isolation is
achieved via an isolation transformer. Every isolator is tested at 1500 VAC to ensure that the
dielectric strength is sufficient.
The output is capable of driving a load of 700 Ohms while only an additional 1.5 Volts are dropped
across the input. For example, an output loop load of 250 Ohms would result in a total input impedance
of: R(load) + R(isolator), where R(isolator) = 75 Ohms
Specifications:
Isolation: Input to Output to Power 1500 VAC (test)
Input: 4-20 mA
Output: 4-20 mA
Accuracy/Linearity: +/-0.1% max., +/-0.05% typ.
Response Time: 10 msec to 63% of final value, 40 msec to 99% of final value
Operating Temperature: -40 Deg.C. to +50 Deg.C.
Temperature Effects: +/-0.1% max., +/-0.05% typ. (for 40 Deg.C. change)
