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Analogue Process Control Services a division of NESS Corporation
Dual Isolator - DI739
Drawings
Inputs 21-24; dcV, mV, Bipolar, dcA
Inputs 35-38; Frequency Inputs
Inputs 39-42; Resistance, pH/OPR, Pot
Inputs 61-65; Add, Subtract, min, MAX
Inputs 33-34; Thermocouple, RTD
Inputs
ac Voltage
dc Current/Voltage
mV
Potentiometer
Resistance
Speed/Frequency
Temperature RTD
Temperature Thermocouple
Functions
Alarm/Transmitter
Isolator
Transmitter
Outputs
dc Current/Voltage - Separate Power
Relay
The DI739 combines two fully independent isolator channels in one housing.
The inputs are factory configured to customer requirement. Both outputs are coding plug configurable for common process signals (Factory default is 4-20mA out). Final calibration can be trimmed by using the front accessible SPAN (S) and ZERO (Z) potentiometers. The optional alarm point on channel 2 is also set by potentiometer utilising the adjacent test socket.
The wide swing DC/DC converter allows for two power supply ranges: 10-60Vdc (16-42Vac), 80-280Vac (80-300Vdc). Isolation is 2kVr.m.s. between all 6 ports. Connection is via unpluggable screw 8-way terminals.
The DI739 can be used in a number of ways:
- Two channel isolation and any mix of signals.
- Isolation and conditioning of two field sensors.
- Signal splitting (one input and two isolated outputs).
- Range splitting where output 1 responds to 0-50% of input, output 2 to 50-100% of input.
See TCS726 for thermocouple splitting.
