5-3
5.2 HiD 2025SK/2026SK
Functional description
Provides a fully floating supply to power a two wire transmitter in a Hazardous Area, repeating the current in sink
mode to simulate a two wire transmitter load in Safe Area. Bi-directional communication is provided for smart
transmitters which use current modulation to transmit data and voltage modulation to receive data.
Outputs are isolated from the inputs and are referenced to the power supply common.
Model 2025SK Model 2026SK
Application Guidelines
The outputs are sink mode so an external power supply must be connected to the output terminal. Note that the
barrier requires a minimum voltage of 7 V to work properly. If in the loop there are several series equipment be
sure the minimum voltage applied conform to specification. The specified operating range is 4-20 mA, but the unit
can operate near 0 mA with reduced accuracy. Please contact Elcon for more details. At the field side, the
equivalent circuit (before current limitation) is around 21 V / 300 Ω
An Hand Held Configurator (HHC) for smart transmitters configuration can be connected either at the SA and at
HA side (in this case you need an IS certified HHC). When in SA, a minimum load of 250 Ω must be present on
the current loop and the HHC must be connected across the output terminals of the unit. When the DCS/PLC has
a low current sense resistor, you need to insert an external series resistor to get proper communication.
The unit can be used with all Elcon standard termination board
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