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Instruction Manual
HBDF MK2 – Defrost Sensor
"Demand defrost", for automatic defrosting of evaporators
Simple Setup, only two parameters and execution of a zero/start point during start-up.
Can operate in two modes:
1: Only analog mA output ("mA only", where the defrost start is controlled by an PLC)
2: Digital relay output with analog mA output
instruction manual - HBDF –mk2 – defrost sensor (013-UK) 19/03-2019 WWW.HBPRODUCTS.DK
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Table of Contents
Related Manuals for HB Products HBDF MK2
Summary of Contents for HB Products HBDF MK2
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Page 1: Instruction Manual
UPTIME EFFICIENCY IN THE REFRIGERATION INDUSTRY Instruction Manual HBDF MK2 – Defrost Sensor “Demand defrost”, for automatic defrosting of evaporators Simple Setup, only two parameters and execution of a zero/start point during start-up. Can operate in two modes: 1: Only analog mA output (“mA only”, where the defrost start is controlled by an PLC) 2: Digital relay output with analog mA output instruction manual - HBDF –mk2 –... -
Page 2: Table Of Contents
UPTIME EFFICIENCY IN THE REFRIGERATION INDUSTRY Table of Contents Instruction Manual ................. 1 HBDF MK2 – Defrost Sensor ..............1 “Demand defrost”, for automatic defrosting of evaporators ......................1 Table of Contents ................... 2 Safety Instructions ................. 4 Introduction ................... 5 Measuring Principle................ -
Page 3: Mme Choice Of "Freezer" Or "Ice Bank" Mode, See
WE INCREASE UPTIME EFFICIENCY IN THE REFRIGERATION INDUSTRY Release note - Revision history, HBDF-mk2 1.4.0 12.09.2017 When running only mA output, it stops at 18mA and goes to 19mA when heater set point is reached, see page 8. 1.4.1 01.03.2019 Choice of “FREEZER”... -
Page 4: Safety Instructions
If changes are made to type-approved equipment, this type approval becomes void. The product's input and output, as well as its accessories, may only be connected as shown in this guide. HB Products assumes no responsibility for damages resulting from not adhering to the above. -
Page 5: Introduction
(Air-Coolers). It emits a 4-20 mA signal. Apart from the 4-20 mA signal, the sensor also has built-in relays for start/stop defrost and external temperature sensor for measuring when the ice is melted. Example showing the HBDF MK2 configuration tool, Basic settings Enable start / stop... -
Page 6: Measuring Principle
Sensors from HB Products are calibrated so that they differentiate between conductive and non-conductive liquids. In refrigeration systems, oil and liquid CO and HFC are not regarded as conductive fluids, whereas refrigerants such as ammonia and brine are regarded as conductive fluids. -
Page 7: Technical Data
WE INCREASE UPTIME EFFICIENCY IN THE REFRIGERATION INDUSTRY Technical Data Supply voltage: 24 V AC/DC Certifications: Electricity consumption: 600 mA EMC Emission: EN61000-3-2 Electrical connection: Screw terminals EMC Immunity: EN61000-4-2 Analogue output: 4-20 mA Max. load: 500 ohm Mechanical specifications: Relay output: 2 x 5A, NO/NC Materials –... -
Page 8: Function
WE INCREASE UPTIME EFFICIENCY IN THE REFRIGERATION INDUSTRY Function HBDF measures the build-up of ice between the fins in the air inlet of the evaporator. The sensor is installed and calibrated for the currently installed evaporator. At start-up, it is usually enough to perform the simple start up procedure as shown in the introduction section. - Page 9 WE INCREASE UPTIME EFFICIENCY IN THE REFRIGERATION INDUSTRY Release note - Revision history, HBDF-mk2 1.4.0 12.09.2017 When running only mA output, it stops at 18mA and goes to 19mA when heater set point is reached. The PLC must have a timer delay to ensure frost condition (remaining water droplets from the melted ice should be frozen to the surface of the evaporator before start measuring), here the signal should be in the range 4 to 5mA, indicating clean evaporator without ice.
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Page 10: Installation
WE INCREASE UPTIME EFFICIENCY IN THE REFRIGERATION INDUSTRY Installation The following applies to system design: The sensor box is installed on the frame of the evaporator. Ground wire should be connected to the frame with a stainless screw. The wire must be placed between the fins in the air inlet side, or where ice build-up occurs. The wire can be fixed with a special HBDF wire-clips or standard nylon (PA6) wire strips. - Page 11 WE INCREASE UPTIME EFFICIENCY IN THE REFRIGERATION INDUSTRY Installation, Continued Place the wire between the fins on the inlet side (or where ice build-up occurs). The distance between the vertical sections of the wire (windings) can be varied from 100 to 500mm depending on evaporator size and wire length.
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Page 12: Electrical Connection
WE INCREASE UPTIME EFFICIENCY IN THE REFRIGERATION INDUSTRY Parameter settings Parameter Description Enable Start/Stop Activate/deactivate the measuring and set the mA output to 4mA, function and set the digital relays to default. Enable mA only function Turn off the digital relays and also the timers. Only running with mA (PLC Control) output. - Page 13 IN THE REFRIGERATION INDUSTRY The HBDF MK2 sensor measures ice formation on evaporators (Air-Coolers). It emits a 4-20 mA signal. Apart from the 4-20 mA signal, the sensor also has built-in relays for start/stop defrost and external temperature sensor for measuring when the ice is melted.
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Page 14: Application Examples
WE INCREASE UPTIME EFFICIENCY IN THE REFRIGERATION INDUSTRY Application examples Safety: Defrosting with hot gas must be performed in a safe way in order to ensure that there is no risk for liquid hammering and leakage of refrigerant. instruction manual - HBDF –mk2 – defrost sensor (013-UK) 19/03-2019 WWW.HBPRODUCTS.DK 14 / 17... -
Page 15: Simple Defrost With Electric Heater
WE INCREASE UPTIME EFFICIENCY IN THE REFRIGERATION INDUSTRY Simple defrost with electric heater The HBDF-MK2 sensor is primarily designed to measure ice thickness where the analoge 4-20mA output indicates the ice thickness, the built-in relays are usually used for start and stop signal of an external defrost timer or controller. -
Page 16: Led Indication
WE INCREASE UPTIME EFFICIENCY IN THE REFRIGERATION INDUSTRY LED indication 1) Green LED, flash indicates power supply, And DI external start signal is ON. 2) Red LED indicates Defrost mode or sensor error (Outside measuring range). LED signal ON/OFF/Frequency Functionality Green On or flash Supply voltage connected... -
Page 17: Sensor Repair
IN THE REFRIGERATION INDUSTRY Sensor Repair In case of defects with the sensor, it will typically only be necessary to replace the electronical part. Complaints are processed by HB Products’ dealers/distributors. Please consider their complaint procedures before returning the sensor. Spare Parts...
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