RHE21 Installation & Startup Guide – Doc. No. 8.2.1.04 – Ver. 1.31
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3.2.3.2.2
Intrinsically safe Analog Outputs
NOTE: Intrinsically safe I/O circuits must only be operated with certified barriers or isolating
amplifiers
An RHE21 transmitter can be supplied with up to two passive floating 4-20 mA analog outputs.
Output 1 can optionally be equipped with a HART digital communications interface.
Figure 15: RHE42 Intrinsically Safe Analog Outputs
Connect the output of the RHE to the isolating switching amplifier.
For analog outputs with HART communication, a HART transparent isolating amplifier must be
used.
3.2.3.3
Digital Inputs
RHE21 transmitters are equipped with one IEC60946 compliant digital input.
NOTE: Unless advised in advance of delivery, all digital inputs are configured by default for
active high operation at the factory. Units with active low operational inputs are available upon
request.
The digital input has an input resistance of 24 kΩ and when operated, will draw approx. 1mA
when connected to a 24Vdc supply.
AOn H
AOn L
Summary of Contents for RHE21
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