Endress+Hauser RIA251, Руководство по эксплуатации

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3. Electrical connection
3.1 Terminal layout and power supply
3.2 Electrical connection
Both the terminal layout as well as the connection values of the
process display relate to the Ex version.
The unit is only meant for use in a 4...20 mA current loop circuit.
Potential equilibrium must be gauanteed on the current loop
(inside and outside the Ex hazardous area). In order to achieve
this use the earthing (ground) lug on the housing.
The unit must only be powered by a power supply that operates
using an IEC 61010-1 compliant energy limited circuit: "SELV
or Class 2 circuit"
1 23 4
Terminal layout In and outputs
1 Measured signal (+) 4...20 mA Signal input
2
Terminal for further instrumentation (link
with 4)
Terminal
3 Measured signal (-) 4...20 mA Signal input
4
Terminal for further instrumentation (link
with 2)
Terminal
Process display
20