Danfoss introduces new range of Guided Radar Liquid Level Sensors

By Sabine Lobnig, Nov 08, 2011, 14:40 2 minute reading

The Danish pioneer for natural refrigerant technology is updating its product portfolio on ammonia21.com to add a new range of guided radar liquid level sensors. Targeted to the industrial refrigeration segment, the sensors are suitable for different refrigerants including ammonia.

The new AKS 4100/4100U liquid level sensor from Danfoss introduces the proven guided radar technology fully adapted for industrial refrigeration. Featuring high flexibility and reliability, the liquid level sensor is designed specifically to measure liquid levels of many different refrigerants, including ammonia, in vessels, accumulators, receivers, standpipes, etc.

Due to the very easy on-site adjustment procedure with AKS 4100/4100U, significant time-savings during installation can be ensured.

Basic specifications of AKS 4100 and AKS 4100U

The difference between the two products AKS 4100 and AKS 4100U are the connections. The AKS 4100 has a G1 in. pipe thread connection whereas the AKS 4100U has a ¾ in. NPT

AKS 4100/4100U liquid level sensors are available in two different versions:

Cable version
  • Suitable for all industrial refrigeration applications – except marine applications
  • Supplied with a 5 meter 197 in. cable – very easy to adjust the probe length to suit the actual application
  • Available with and without HMI Display unit
Coaxial version
  • Suitable for all industrial refrigeration applications including marine applications
  • Coaxial version can be supplied in a variety of lengths:
  • AKS 4100 from 500 mm up to 2200 mm
  • AKS 4100U from 19.2 in. up to 85 in
The optional display unit is used for commissioning and quick on-site setup and is easily mounted on the AKS 4100/4100U. The display unit supports multiple languages and both SI and US units.

The Guided Radar (TDR technology - Time Domain Reflectometry) measuring principle

The AKS 4100/4100U signal converter emits low-intensity, high frequency electromagnetic pulses with a width of approximately 1 nanosecond, which travel at the speed of light along the probe down to the liquid surface.

The pulses are reflected by the liquid surface, guided back along the probe, and received and analysed by the AKS 4100/4100U signal converter and then converted into a liquid level reading. This method is called Guided Radar (Time Domain Reflectometry (TDR)).

About Danfoss

Danfoss is a global leader providing efficient solutions that help save energy and meet the challenge of climate change. Its key competencies are cooling of food, air conditioning, control of electrical motors and heating in buildings – as well as solutions for renewable energy such as solar power. Today Danfoss employs 23,500 employees globally and has 110 sales companies around the world.


By Sabine Lobnig

Nov 08, 2011, 14:40

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