K25 Level Switch



The K25 optical level switches are designed for use in level monitoring for controlling the oil or liquid CO2 in transcritical or sub critical applications. They have bodies made of stainless steel and sensor dome made of glass. They are economicaldependable, and compact in size with overall dimensions of 90 x 36 mm and have no moving parts. They not only sense the level but also measure the temperature of the liquid via 4-20mA output. These level switches use infrared technology for their operation. They have an operating temperature range of -40 to 125 deg C. There is a programmable timer inside these K25 optical level switches that allows a delay time to be set for delaying the output switching. The output modes are normally closed in presence of liquids and open in air or vice versa. The DC digital output current is up to 50mA depending on model and the temperature output is 4-20mA analogue current output These level switches must not be installed close to any infrared sources. The dome must be at least 50mm away from any reflective surface (directly contact us for lower distance installations). They have electronic protection against transient over voltage and reverse polarity. The K25 optical level switches have a detection accuracy of +/- 2 mm. They can withstand maximum pressure of 150 bars.

Operation mode:
Detect liquid presence with contact
± 2 mm
Body materials:
Stainless Steel
Sensible dome:
Enclosure protection class:
Transient over voltage, reverse polarity
Max. Temperature range:
From –40ºC up to +125ºC
Storage Temperature:
From –40ºC up to +125ºC
Supply voltage:
24 VDC ± 10%
Supply current:
20mA max
Output type:
AC / DC Output current:
up to 50 mA max
Output mode:
Output Normally Open or Closed in the air
Temperature output type:
Analogical from 4 to 20 mA
Max working pressure:
up to 150 bar
Delay times:
Customizable depending on application needings
Temperature (°C) Current (mA) Voltage (mV)(*)
-40 4 400
-30 5 500
-20 6 600
-10 7 700
0 8 800
10 9 900
20 10 1000
30 11 1100
40 12 1200
50 13 1300
60 14 1400
70 15 1500
80 16 1600
90 17 1700
100 18 1800
110 19 1900
120 20 2000

(*) Example with an external load of 100 ohm resistor