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INTRODUCTION

HBDF-MK2 is a unique, but easy adaptable solution for automatic defrosting of evaporators. Optimal defrosting results in energy savings and increased freezing capacity. Experiences from existing installations have shown that it can easily save up to 40% of energy and thereby fast return of investment. 


The sensor measures the thickness of ice built up between the fins and it sends a 4-20mA or digital ON/OFF signal to the control systems. A PT1000 temperature sensor located at the fins, in bottom part of evaporator, senses when defrost is accomplished and stops the sequence.
The defrost sensors are based on the capacitive measuring principle, in which an insulated steel wire acts as one conductor. The evaporator fins and tubes act as the second conductor, jointly forming a viable electrical capacitor.

Changes in the measured signal occur when ice is built up between the fins, as the sensor Changes in the measured signal occur when ice is built up between the fins, as the sensor measures the dielectric difference between the air and ice.

The sensor can be installed in less than one hour, both on new and old evaporators. The sensor can be installed in less than one hour, both on new and old evaporators. It can even be installed when the system is in operation, hence shutdown is not necessary. The electronic part is mounted on the evaporator’s frame by using 2-4 screws. The mechanical part consists of a thin PA12 or PTFE - coated wire, which is mountedbetween the fins of the evaporator in theair inlet side with special HB Snap-On clips or standard nylon cable ties.The HBDF-MK2 sensor is available in 3 versions,  with a 10-, 20-, and 30 meter wire and as standard, Low Temperature (LT) or Heat Pump-version (RS).


After the installation, the sensor should be calibrated/configured to the evaporator by using the HB-TOOL (PC-based software tool), which can be downloaded from our web-site.

TECHNICAL DETAILS

Defrost starts only when needed (on demand)

Stop the defrost when ice is melted (input from temperature sensor located on evaporator surface)

Save energy compared with timer based defrosting

Gain more capacity - fewer and shorter defrost cycles

Easy installation - also on existing sites

SPECIFICATIONS

Power supply
Supply voltage 24 AC/DC
Electrical connection Screw terminals
Electrical consumption 600 mA
Max. load 500 ohm
Output
Analog output  4-20 mA
Relay output  2 x 5A, NO/NC
Relay output 24V  2 x 3A, NO/NC
Environmental conditions
Ambient temperature -30...+50°C
Protection class IP65
Vibrations IEC 68-2-6 (4g)
Mechanical specifications
Material - mechanical parts AISI 304
Material - electronic parts Nylon 6 (PA)
Approvals
Certifications - EMC Emission EN 61000-3-2
Certifications - EMC Immunity EN 61000-4-2
Indication
LED indication Green and red
Configurations
Configuration Push button

 

 

Defrost sensor 19mA blå02 web

APPLICATIONS

Defrost sensor 19mA blå02 web

DISCLAIMER

Description Wire length Ordering code
Defrost sensor MK2 10 m HBDF-MK2-10
Defrost sensor MK2 20 m HBDF-MK2-20
Defrost sensor MK2 30 m HBDF-MK2-30
Defrost sensor MK2 for low temperature 10 m HBDF-MK2-10-LT
Defrost sensor MK2 for low temperature 20 m HBDF-MK2-20-LT
Defrost sensor MK2 for low temperature 30 m HBDF-MK2-30-LT
Defrost sensor for heat pump applications 10 m HBDF-MK2-10-RS
Defrost sensor for heat pump applications 20 m HBDF-MK2-20-RS
Defrost sensor for heat pump applications 30 m HBDF-MK2-30-RS
Electronic Part for HBDF-MK2 Spare part must be calibrated HBDF-MK2-EL
     
     
HBDF-snapON Clips Piping in mm Ordering Code
Bag of 25 pcs. 8-10 mm HBDF-SnapONClip8-25
Bag of 50 pcs. 8-10 mm HBDF-SnapONClip8-50
Bag of 25 pcs. 10-12 mm HBDF-SnapONClip10-25
Bag of 50 pcs. 10-12 mm HBDF-SnapONClip10-50
Bag of 25 pcs. 12-14 mm HBDF-SnapONClip12-25
Bag of 50 pcs. 12-14 mm HBDF-SnapONClip12-50
Bag of 25 pcs. 14-16 mm HBDF-SnapONClip14-25
Bag of 50 pcs. 14-16 mm HBDF-SnapONClip14-50
Bag of 25 pcs. 16-18 mm HBDF-SnapONClip16-25
Bag of 50 pcs. 16-18 mm HBDF-SnapONClip16-50
Bag of 25 pcs. 19-22 mm HBDF-SnapONClip19-25
Bag of 50 pcs. 19-22 mm HBDF-SnapONClip19-50
Bag of 25 pcs. 22-25 mm HBDF-SnapONClip22-25
Bag of 50 pcs. 22-25 mm HBDF-SnapONClip22-50
     
     
USB programming cable Accessories HBxC-USB

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