Product Details

Description

NIVOCONT K level switches, based on the conductivity principle, can be applied to liquids with conductivity higher than 10^-5 S/cm.

For detecting the level, probes are immersed into the tank. These probes (and the tank wall if conductive) serve as contacts of an electric circuit.

Probes can be of single or multiple rod versions. A maximum of 4 probe rods can fit in the multiple probe socket with an additional reference probe if tank wall is not conductive.

The probe length should be in accordance with the level to be detected. When the liquid level reaches the probe, it will create a short-circuit and the output relay will be activated. The device senses the conductivity difference between the probes and the reference probe. The KLP separators should be used at every 0.5 m to provide suitable distance between the probes.

Main Features

Level Switches

KRK-512

Level switching
Filling-emptying control
Selectable NO/NC relay function
Adjustable sensitivity
Adjustable delay ON and delay OFF time
Delay time indication
AC/DC versions

KRK-622

The following functions can be selected:
– Monitoring of 2 independent levels in 2 tanks
– Monitoring of 2 independent levels in 1 tanks
– Pumping from one tank to another
DIP switch selection on the front panel (8 functions)
Adjustable probe sensitivity (for each probe separately)
Adjustable relay switching delay (for each probe separately)
AC/DC versions

Compact Level Switches

KKH-2_2

Probe and relay in one unit
1 or 2 incorporated KRK-512 electronics
1 or 2 independent relay outputs for pump control or differential level switching
Selectable NO/NC relay function
Adjustable sensitivity
Adjustable delay ON and delay OFF time
Delay time indication
AC/DC versions

Technical Specs


Probes	Single Probe			Multi Probe							Submersible
				Aluminium housing			Plastic housing
	KSP-201	KSS-201	KSN-201	KSH-202	KSH-203	KSH-204	KSH-301	KSH-302	KSH-303	KSH-304	KSK-201
Number of probes	1			2+s*	3+s*	4+s*	1+s*	2+s*	3+s*	4+s*	1
Process connection	3/8″ BSP			1 1/2” BSP							Cable mountable
Probe socket material	PP	carbon steel	1.4571				PP				-
Housing	-			Aluminium cast			PBT				ABS
Probe material	1.4571										1.4401
Insulation of socket	PP	PFA					PP				-
Medium temperature	max. +80 °C	max. +200 °C					max. +80 °C
Pressure max	max. 0.3 MPa (3 bar)	max. 1.6 MPa (16 bar)					max. 0.3 MPa (3 bar)				-
Electrical connection	With rubber cap			M20x1.5 cable gland, cable diameter: 6…12mm							Pg9 (1)
Ingress protection	IP20			IP65			IP67				IP68
Mass (w/o probe)	0.1 kg			0.4 kg			0.2 kg				0.05 kg
s* = reference probe (1) Cable: Ø4 – 7 mm


Type	KRK-512-5	KRK-522-□
Power supply (Un)	24 – 240 V AC/DC	110 V AC, 230 V AC	24 V AC/DC
	-15% … +10%
Power consumption	max. 2.5 VA / W	max. 4.5 VA / W
Ambient temperature	-20 °C … +55 °C
Probe voltage	3.5 V AC	5 V AC
Probe current	max. 0.2 mA AC	max. 1 mA AC
Sensitivity	Adjustable: 5 kΩ – 100 kΩ
Cable capacitance	100 nF (100 kΩ sens.) 800 nF (5 kΩ sens.)	max. 4 nF
Fixed on-delay (t1)	1.5 sec	-
On and off-delay	0.5 – 10 sec
Relay output	1x SPDT 250 V 8A, AC1 24 V DC min. 500 mW	2x SPDT 250V 16A, AC1 24 V DC min. 500 mW
Electrical connection	Terminal block, max. 2.5 mm2 / with insulation 1.5 mm2
Electrical protection	Class II
Mechanical connection	EN 60715 rail
Ingress protection	IP20
Mass	72 g	240 g


Type	KKH-212-5	KKH-222-5
Power supply (Un)	24 V – 240 V AC/DC
	-15% … +10%
Power consumption	max. 2.5 VA / W	max. 5 VA / W
Ambient temperature	-20 °C … +50 °C
Medium temperature	max. +80 °C
Medium pressure	1 bar
Number of probe	2+s*	4+s*
Probe voltage	3.5 V AC
Probe current	max. 0.2 mA
Sensitivity	Adjustable: 5 kΩ – 100 kΩ
Fixed on-delay	1.5 sec
On and off-delay	0.5 – 10 sec
Relay output	1x SPDT 250 V 8A AC1 / DC 24V 8A	2x SPDT 250V 8A, AC1 / DC 24V 8A
Electrical connection	Cable gland: 2x M20x1.5 Ø6 – 12 mm cables, Terminal block, max. 2.5 mm2 / with insulation 1.5 mm2
Electrical protection	Class II
Process connection	1½” BSP
Material of probe socket	PP
Housing material	Polycarbonate
Ingress protection	IP67
Mass	660 g (without probe)	800 g (without probe)
s*=reference probe