NIVELCO NIVOCONT K User manual

1. APPLICATION
The conductive operating principle is suitable for liquids with a specic conductivity of over
10 μS / cm. The signal processor detects the resistance between the auxiliary probe and the
sensing probes. Conductive devices can only be used to decide whether the level of the mea-
sured medium is at a particular level or not. The level of detection is determined by the length
of the probe stem extending into the tank.
The level switch consists of the NIVOCONT KRK–512–5 signal processor and probes select-
ed for the particular application. The part of the probe that can be screwed into the tank is
NIVOCONT KS–0 probe head carrying one or more KLN–2 probe stems. If the
inside of the tank is coated or non-conductive, an auxiliary probe has to be installed, which is
longer than both sensing probes. If the tank’s walls are conductive, they can be used as an
auxiliary probe.Conductive switches can control the lling and emptying of the tank or generic
level detection.
2. TECHNICAL DATA
2.1 GENERAL DATA
2.1.1 Switch
KRK–512–5
Probe voltage max. 3.5 V AC
Probe current < 0.1 mA AC
Sensitivity Adjustable: 5…100 kΩ
Max. cable capacitance 800 nF (5 kΩ) 100nF (100 kΩ)
Response time max. 400 ms
Mechanical accuracy ±5%
Delay Adjustable: 0.5…10 s
t1 delay 1.5 s
Relay output 1× toggle (SPDT)
Switching voltage 250 V AC1, 24 V DC
Switching current 8 A AC1
Switching power 2000 VA AC1, 240 W DC
Min. output power DC 500 mW
Mechanical life-span 1 × 107switchings
Electrical life-span 1 × 105switchings
Power supply Un24…240 V AC/DC (AC 50–60 Hz)
Voltage range allowed nominal voltage –15%…+10%
Power consumption max. 2 VA
Ambient temperature −20…+55 °C (–4…+131 °F)
Electrical connection max. 2.5 mm2
(AWG14)
/ with insulation 1.5 mm2 (AWG16)
Electrical protection Class II
Overvoltage category* II
Pollution degree 2
Ingress protection IP20
Mechanical connection DIN (EN 60715) rail
Weight 72 g (0.16 lb)
*EN61010-1, tested with 3 kV
krk512en1906h
Thank you for choosing a NIVELCO instrument! NIVOCONT K
KRK–512
CONDUCTIVE LEVEL SWITCH
Manufacturer:
NIVELCO Process Control Co.
H–1043 Budapest, Dugonics u. 11.
Tel.: [phone] Fax: [phone]
E-mail: [e-mail] www.nivelco.com
USER’S MANUAL
PDF 
KRK–512–NIVOCONT KS–0
KLN–2
Type Code
Cable probe K
SINGLE PROBE
PP socket P
Carbon steel socket S
Stainless steel socket N
MULTIPLE PROBES
Stainless steel socket H
Housing mat. Code
Aluminum 2
Plastic 3
Probe number Code
1 + reference probe* 1*
2 + reference probe 2
3 + reference probe 3
4 + reference probe 4
Power supply Code
24…240 V AC/DC 5
Code Probe length Code
00 m 0 m 0
11 m (3.3 ft) 0.5 m (1.64 ft) 5
22 m (6.6 ft)
33 m (10 ft)
2.2 ORDER CODES
2.4 DIMENSIONS
2.3 ACCESSORIES
– User’s Manual
– Warranty Card
– EU declaration of conformity
– Seal (2 mm [0.08"] thick)
(KLINGER OILIT) :
1× ⅜" (KSP–201, KSS–201, KSN–201)
1× 1½" (KSH–20  )
– M6 nut (standard SW):
3× (KSH–202)
4× (KSH–203, KSH–204)
– M6 nut (non-st. SW)
1× (KSH–204)
KSK–
201
KSP–
201
KSS–
201
KSN–
201
KSH– KLN–
2 
KLP–
201
KLP–
204
202 203 204 301 302 303 304
Number of probes 12+r 3+r 4+r 1+r 2+r 3+r 4+r 1–
I nsulation of socket ABS PP PFA PP –
Cable gland Pg7 M4 nut,
protected by a rubber cap
M20x1.5
cable diameter Ø6…12 mm (Ø0.25…0.5 inch)
– –
Process conn. – ⅜" BSP 1½" BSP M6 –
Socket material – PP A44
c. steel
KO35
stainless steel (1.4571) PP KO35 1.4571 –
Housing material – Powder-coated
cast aluminum PBT – PP PVDF
Medium
temperature
max. +80 °C
(+176 °F)
max. +200 °C (+391 °F) max. +80 °C (+176 °F) –
max.
+80 °C
(+176 °F)
max.
+130 °C
(+266 °F)
Max. pressure – 3 bar
(43.5 psi)
16 bar (232 psi) 3 bar (43.5 psi) –
Ingress protection – IP20 IP65 IP67 –
Mass 50 g
(0.11 lb)
100 g (0.22 lb) 400 g (0.88 lb)
220 g/m
(0.13 lb/ft)
–
r = reference probe
2.1.2 Probe sockets
Pg7
M20x1.5
⅜" BSP
Switch
KRK–512–
Cable Probe
KSK–201
Probe Socket
KSH–20
Probe Socket
KSP–201 / KSS–201 / KSN–201
Probe
KLN–2
Uninsulated base probe
M20x1.5
85
Probe Socket
KRK–512–
Separator
KLP–204
Probe Socket
KSH–30
Separator
KLP–201
Separator:
NIVOCONT KLP–201 – for plastic version
NIVOCONT KLP–204 – for aluminum version
*only plastic version

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 ofcial 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) overlling or unwanted emptying
is prevented.
FILLING
level
EMPTYING
level