ASFT - FRENSOR Freezing Point Sensor
Freezing Point Sensor
    Model: ASFT - FRENSOR  Freezing Point Sensor
    Country of Origin: SWEDEN
    Use: For an exact detection of the freezing point temperature on roads and runways.
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Details Solution Applications Downloads Order
Mobile, Fixed or Portable
Information on when and where new de-icing is required

Frensor is a patented solution for an exact detection of the freezing point temperature on roads and runways. It was originally developed due to the desire to optimize (minimize) the use of deicing on Swedish roads. 
The Frensor actively heats and cools the fluid to determine the exact freezing point and is independent of the de-icing chemical used. The correct freezing point is detected without special calibration, even if the fluid is contaminated with unknown chemicals.

mobile version
By using the Frensor in the mobile version it is possible to perform freezing point mapping for any area. The presented output is in the form of a map over the covered area, showing the different freezing temperatures and surface temperatures of that area. This information can then be used to determine the amount of de-icing fluid (e.g. salt) to be spread at different sections of the road or runway and where no new de-icing is needed.

fixed version
Using the Frensor in a fixed version, the output can be presented as a graph, displaying the changes in surface-temperature and freezing point over time. This information can be used to forecast when the spreading of new de-icing fluid (e.g. salt) will be required, and even more interesting; when no new de-icing is needed because the protection on the road or runway is adequate.

Portable version
The third version the Frensor® comes in, is the portable FboX™. The FboX™ is a fully stand-alone, portable freezing-point detection system and can be used to manually collect and analyze samples anywhere.

Technical specifications
Description Specification
De-icing fluid Detects freezing point for any de-icing fluid. For example NaCl, CaCl2, Urea, Clearway, Safeway etc
Road status reporting Dry, wet, freezing point
Freezing point temperature (tf) detection range -20 < tf < 0°C
Accuracy ± 0.7°C
Environment condition (te) to get Freezing point -40 < te < 10°C Sensors will be in standby when environment temperature is too hot (above 10°C) or too cold (below –40°C)
Freezing and environment temperature condition to get freezing points | tf-te | < 20°C
Output and input Serial RS232 command interpreter and one 4-20 mA output.
Optional output Analogue 4-20 mA. A single mean value for all connected sensors.
Detection time Normally 10 to 30 seconds. 3 seconds up to several minutes depending on environment conditions. Mobile version is faster.
Logging 10 minute values can be stored up to 3 months in Flash memory
Modem support Siemens TC35 and standard PSTN modems
Power requirements 12VDC, 3.5A or 230VAC
Size of sensor Ø 40 mm, height 40 mm
Sensor type Cu sensor body, weight Approx 300 gram each
Size of controller cards 2 single Euro size circuit boards, size 160 × 100 mm each. Complete size approx 100 × 200 × 40 mm. One board is the computer and the other is the driver for the sensors. Computer boards are mounted in an aluminum housing.

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