NIVELCO NIVOCONT K, User Manual, Page: 1 / 2

1. APPLICATION
The conductive operating principle is suitable for liquids with a specific 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 filling 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
t
1
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 × 10
7
switchings
Electrical life-span 1 × 10
5
switchings
Power supply U
n
24…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 mm
2
(AWG14)
/ with insulation 1.5 mm
2
(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.: +36-1-889-0100

Fax: +36-1-889-0200
E-mail: sales@nivelco.com

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
0 0 m 0 m 0
1 1 m (3.3 ft) 0.5 m (1.64 ft) 5
2 2 m (6.6 ft)
3 3 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 1 2+r 3+r 4+r 1+r 2+r 3+r 4+r 1 –
Insulation 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