RHE26/27 Installation & Startup Guide – Doc. No. 8.2.1.06 – Ver. 1.40
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3.2.3.3
Digital Inputs
RHE26/27 transmitters can be equipped with up to two IEC60946 compliant digital inputs.
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.
Digital inputs have an input resistance of 24 kΩ and when operated, will draw approx. 1mA when
connected to a 24Vdc supply.
Figure 12: Digital Inputs
Digital inputs can be operated with an active DC signal instead of a switch. The maximum input
voltage must not exceed 30V DC. Note that inputs require a switching current of 0.6mA; the
minimum input voltage for a high reading is 14.4V DC.
