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Oil Level Regulators

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Oil Level Regulators

The oil control optical level switches are designed for monitoring and controlling the oil level in compressor crankcase.
read more about oil level controllers

CO2 Refrigeration

CO2 Refrigeration

CO2 Refrigeration


Teklab devices are designed for use in level monitoring applications for the control of oil or liquid CO2 for transcritical or subcritical systems.
read more about Teklab solutions for CO2 refrigeration systems

Oil Level Infrared Sensors

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Oil Level Infrared Sensors


The metallic oil level switch has been designed for use in level monitoring applications for the control of oil for compressors or liquid CO2 in transcritical or sub critical applications.
read more about metallic oil level infrared sensors

K25 4-20 mA Level Switch. Metallic IR sensor

K25 4-20 mA Level Switch. Metallic IR sensorThe 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 economical, dependable, 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.
Click here to download a PDF technical sheet of the K25 4-20 mA liquid level switch (320 Kb)

Technical Data of the Instrument

Operation mode : Detect liquid presence with contact
Repeatability : ± 2 mm
Body materials : Stainless Steel
Sensible dome : Glass
Electronic protections : 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 (level section) : 20mA max
Output type : NPN
DC Output load current : up to 50 mA max
Output mode : Output Normally Open or Closed in the air
Temperature output : Analogical from 4 to 20 mA
Max pressure : up to 150 bar
Delay times : Customizable depending on application needings

Temperature Reference

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

Electrical Connection

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Mechanical Dimensions

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Copyright 2008-2011 - Teklab S.r.l. - Via Emilia Ovest, 1179 - 41123 Modena - Italy - P.IVA 01976750362 - Company Register of Modena n. 01976750362 - Paid-in Capital Euro 10.000 i.v.