5-15
5.8 HiD 2037/2038
Functional description
Repeats a 4-20 mA input signal from a control system to drive I/P converters, electrovalve actuators and displays
located in a Hazardous Area. Designed for use with smart I/P and valve positioners, each isolated channel has a
low input impedance and allows complete freedom of connection in the input loop due to the high common mode
compliance in respect to the supply.
A separate fault output is signalled if the field wiring is broken or shorted. A field open circuit presents a high
impedance to the control device input.
Model 2037 Model 2038
Application Guidelines
The barrier is suitable to drive I/P converters or similar current driven device in Hazardous Area. Due to the totally
isolation and low voltage drop-out inputs, the unit HiD 2038 is suitable to perform a single input-dual outputs
connection with an external cross wire as shown in figure
An Hand Held Configurator (HHC) for smart driver configuration can be connected either at the SA and at HA side
(in this case you need an IS certified HHC). When in SA, HHC must be connected on input terminals and must be
verified that control device has an HART compatible output characteristic. Otherwise insert an appropriate filter
from valve manufacter between the control device and the unit.
To interface a low voltage drop-out device (<1.5 V ) and to maintain the fault detection capability, you need to
insert an external series resistor of 100 Ω close to the device.
A separate fault output is signalled in case of field wiring shorted or opened. The segnalation is made possible by
an LED (ON when fault is present, OFF in normal condition) and with common fault bus to de-activate the optional
fault monitor module on termination board. A field open circuit presents a high impedance to the control device
input to allow alarm conditions to be monitored. To prevent fault segnalation on spare channel/module is
necessary to connect a 10 KΩ ½ W resistor across the I/P output terminals 1-4 and/or 2-5.
The unit can be used with all Elcon standard termination board
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