Omron, K8AK-LS Series

Self-holding circuit implemented with circuit processing that is not depending on external wiring.
Switch between water supply and discharge with a DIP switch setting.
Sensitivity adjustment of operating resistance from 10 k to 100 kΩ for application to a wide range of liquids.
Prevents chattering of relay contacts that occurs with ripples.
Easy wiring with ferrules.
Use 2 × 2.5 mm² solid wire or 2 × 1.5 mm² ferrules.
Applicable as a floatless switch.

last update: April 3, 2017

Power supply voltage	24 VAC 50/60 Hz or 24 VDC 100 to 240 VAC 50/60 Hz
Voltage across elec-trodes	5 V p-p (Approx. 20 Hz)
Power consumption	24 VAC/DC: 2.0 VA/1.1 W max. 100 to 240 VAC: 4.6 VA max.
Operating resistance	10 k to 100 kΩ (variable)
Reset resistance	250 kΩ max.
Response time	Approx. 0.1 to 10 s (variable)
Length of cable	100 m max. (fully insulated 3-core 0.75-mm² cab-tyre cable, 600 V)
Indicators	PWR: Green, RY: Yellow
Output contact ratings	Rated load Resistive load 5 A at 250 VAC 5 A at 30 VDC Maximum switching capacity: 1,250 VA, 150 W Minimum load: 5 VDC, 10 mA (reference values) Mechanical life: 10 million operations min. Electrical life: 5 A at 250 VAC or 30 VDC: 50,000 operations 3 A at 250 VAC/30 VDC: 100,000 operations
Ambient operating tem-perature	-20 to 60°C (with no condensation or icing)
Storage temperature	-25 to 65°C (with no condensation or icing)
Ambient humidity	25% to 85% (with no condensation)
Storage humidity	25% to 85% (with no condensation)
Altitude	2,000 m max.
Terminal screw tightening torque	0.49 to 0.59 N·m
Case color	N1.5
Case material	PC and ABS, UL 94 V-0
Weight	Approx. 150 g
Mounting	Mounts to DIN Track.
Dimensions	22.5 × 90 × 100 mm (W × D × H)

Operating voltage range	85% to 110% of rated voltage
Installation environ-ment	Installation category II, pollution level 2
Approved standards	EN 61010-1
EMC	EN 61326-1 Industrial electromagnetic environment
Safety standards	UL 508 (Recognition), Korean Radio Waves Act (Act 10564), CSA: C22.2 No.14, CCC: GB14048.5
Insulation resistance	20 MΩ min. Between all external terminals and the case Between all power supply terminals and all input terminals Between all power supply terminals and all output terminals Between all input terminals and all output termi-nals
Dielectric strength	2,000 VAC for 1 min Between all external terminals and the case Between all power supply terminals and all input terminals Between all power supply terminals and all output terminals Between all input terminals and all output termi-nals
Noise immunity	1,500 V power supply terminal common/normal mode Square-wave noise of ±1-μs/100-ns pulse width with 1-ns rise time
Vibration resistance	Frequency: 10 to 55 Hz, 0.35-mm single amplitude 10 sweeps of 5 min each in X,Y, and Z directions
Shock resistance	100 m/s², 3 times each in 6 directions along 3 axes
Degree of protection	Terminals: IP20

last update: April 3, 2017

* Dimensions in parentheses are for the PFP-50N.

TITLE	DOCUMENT TYPE	SIZE
K8AK-LS	Catalog	2124 KB
Device selection guide for water level control applications	Catalog	2428 KB