krk512en1906h
3. INSTALLATION
It is recommended to cut the KLN–2 probes to the length required for the level of detec-
tion. The probes must be screwed into the KS–0 type sockets.
ALWAYS REMEMBER TO TIGHTEN THE PROBE WITH AN M6 NUT!
When using KSH–204 probe sockets, the reference probes must be tightened with special
SW M6 hex nuts!
For multiple probe devices, it is recommended to use KLP– separators every 0.5 m
(1.64 ft)
on the probes to keep them apart.
A KSK–201 single probe attached to an insulated cable can be lowered into pits and wells
without the risk of a short circuit.
Two probes are required for limit switching in wells and plastic pipes.
4. WIRING
If the wall of the tank is conductive, no reference probe
is needed.
In this case, terminal ‘C’ must be connected to the tank.
On multiple probe units, E1 and E2 are marked ‘1…4’,
and the reference probe is marked ‘C’.
The maximum cable length between the signal proces-
sor and the probes depends on the capacitance and
conductivity of the cable.
5. COMMISSIONING
5.1. ADJUSTMENT
The green LED (Un) shows that the unit is on, and the red LED indicates the energized state of
the relay. The operating mode and delay time (ON and OFF) can be set with the rotary selector
switch and potentiometer on the front panel.
To set the sensitivity using the SENS potentiometer, do the following: submerge all probes
into the liquid. Set a minimal delay time (t). Adjust the sensitivity from minimum to the maximal
value until the relay becomes energized. Now set the sensitivity just a little higher.
9. MAINTENANCE, REPAIR
The device does not require regular maintenance. The warranty card contains the
terms and conditions. Before returning the device for repairs, it must be cleaned
thoroughly. The parts in contact with the medium may contain harmful substances;
therefore, they must be decontaminated. Our ofcial form (Returned Equipment
Handling Form) must be lled and enclosed in the parcel. Download it from our
website www.nivelco.com. The device must be sent back with a declaration of de-
contamination. A statement must be provided in the declaration that the decontam-
ination process was successfully completed and that the device is clean from any
hazardous substances.
10. STORAGE
Ambient temperature: −30…+70 °C
(−22…+158 °F)
Relative humidity: max. 85%
krk512en1906h
June 2019
NIVELCO reserves the right to change anything
in this manual without notice!
A1, A2 – Power Supply
C – Reference Probe
E1 – High Level Probe
E2 – Low Level Probe
15, 16, 18 – Relay Outputs
5.2. THE LEDS
Green LED is on – power supply is on
Red LED is on – relay is energized (contacts 15 and 18 are closed)
Red LED is off – relay is de-energized (contacts 15 and 16 are closed)
Red LED blinking – output delay indication
5.3. LIQUID LEVEL DETECTION
If the KRK–512–5 monitors only one level, the sensing
probe must be connected to the E1 and E2 terminals.
For high fail-safe mode detection, the ‘PUMP’ switch
should be in the ‘UP’ position and low level detection in
the ‘DOWN’ position. Then the level alarm is indicated by
a de-energized relay, just like a power outage.
Power supply terminals
Probe connection
Probe connection
Output terminals
Delay
Function
Sensitivity
Power supply LED
(green)
Output indicator
(red LED)
Front panel of NIVOCONT KRK–512–5
5.4. LEVEL CONTROL
NIVOCONT KRK–512–5 can be used for control of lling
or emptying.
During lling control, the ‘PUMP’ switch should be in
position ‘UP’ and during emptying control in position
‘DOWN’. That way in case a power supply outage oc-
curs (energized relay) overlling or unwanted emptying
is prevented.
FILLING
level
EMPTYING
level
