5
Description
The level switch NRS 2-4 is an analogue electronic amplifier for the capacitance electrode NRG 211.
In conjunction with the electrode NRG 211 it can detect high water level.
In addition, the level switch detects possible malfunction signals coming from the electrode and
monitors the electrode supply cable.
Design
NRS 2-4c:
19 slide-in unit with guide rails and 32 pole screw-type connector for installation in 19 magazine to DIN
41494, part 5. Front panel to DIN 41494, part 5, 6 division units*).
NRS 2-4d:
Spare 19 slide-in unit, front panel to DIN 41494, part 5, 6 division units.
Function
The NRS 2-4 is a single-channel device equipped with a power supply unit and a voltage detector. The
feed voltage (12 V DC) for the electrode is – depending on the operating condition – converted into a
measuring voltage. The signal decoder allocates the measuring voltage to an operating condition which
is indicated by the LEDs on the front panel of the NRS 2-4.
The level switch can signal the following four operating conditions:
n Normal operation
n High level alarm
n Malfunction in level electrode
n Malfunction in connecting cable
In the event of a high level alarm or malfunction the corresponding output relay will be triggered.
In addition to the output relays optocouplers are also available for switching.
Explanatory Notes
Scope of supply
NRS 2-4c
1 Level switch designed as 19" slide-in unit, front panel to DIN 41494, part 5, 6 division units*)
2 Guide rails
1 Screw-type connector
1 Installation manual
NRS 2-4d
1 Level switch designed as 19 slide-in unit, front panel to DIN 41494, part 5, 6 division units*)
1 Installation manual
*) 1 division unit = 5.08 mm
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