Kobold NWS, Operating Instructions Manual

Page: 13 / 25

NWS
NWS K06/0214 Page 13
9.2.2 Selecting operating mode
By reversing the polarity of the power supply, the switching function of the NWS-
...23/24 can be changed from a N/C contact to a N/O contact.
In the case of the NWS-...2W/2H (WHG), the switching function cannot be
changed for reasons of safety. This electronic switch opens in case of wetting, a
faulty sensor or a power failure.
For the NWS-2E the operating modus is selected by connecting the
corresponding connector (plug connector or cable pin assignment) (see 8.2).
Function Signalling NAMUR-output fork
N/C
LED on ≥ 2.1 mA uncovered
LED flashes quickly ≤ 0.8 mA covered
N/O
LED on ≥ 2.1 mA covered
LED flashes quickly ≤ 0.8 mA uncovered
9.2.3 Calibration mode NWS-23/24/2W/2H and NWS-2E
Each appliance is adjusted by the factory to record fluids with density 1,0 kg/l
(water). It is not usually necessary to alter this pre-adjustment. In extreme
situations, however, such as with very light fluids at high temperatures or highly
viscous fluids, which produce a significantly extended reaction time from dry to
wet, it can be advantageous to alter the pre-adjustment. In the calibration mode
for NWS-2E, the NAMUR loop current changes with the state of the LED signal.
Therefore, the subsequent signal evaluation should be suppressed during the
calibration process. In order to attain the calibration mode the test magnet must
be placed at the label marking and held, then the supply voltage must be
switched on. After approximately 1 second the LED goes on, after 2 seconds the
LED goes out, then remove the test magnet – the appliance stays now in the
main menu of the calibration mode.
There is a choice of options in the main menu - Switchpoint Calibration,
Hysteresis Level and LED Mode (not NWS-2E). The LED indicates the selected
option:

Switchpoint Calibration: LED flashes briefly 1x, then LED 2 seconds off.

Hysteresis Level: LED flashes briefly 2x, then LED 2 seconds off.

LED Mode: LED flashes briefly 3x, then LED 2 seconds off (not NWS-2E).
The option points are repeated in an infinite loop.
In order to get access to an option the test magnet must be placed briefly when
the LED has signalled the requested option point.