Strainer Housing - Compressor Protection

Technical data: HBCP-ST

HBCP is a simplified variant of the HBX vapor quality sensor used at the compressor inlet. HBCP can provide an alarm, when the liquid content in the gas exceeds the critical set point. This alarm and a measured value are typically sent to a PLC. This information can be used for controlling the system and stop the compressor to avoid liquid slugging.

The sensor can prevent liquid refrigerant from entering the compressor and causing damage and break down. Especially in larger systems with several evaporators it can be difficult to control all unit and this sensor can be used for both surveillance and trouble shooting.

The HBCP and the vapor quality sensor measures the amount of liquid in the gas passing through the sensor and react instantly.

The sensor is available in two versions:

  • Rod style sensor which must be installed in an elbow after at the end of a horizontal pipe. The sensor must be located at the bottom of the pipe where the liquid flows. The sensor will not work if located at the middle of the pipe or in a vertical pipe.
  • The strainer house sensor is installed in an empty strainer house, and it measures all the liquid flowing on the walls.

The strainer house solution is available from DN20 to DN300 in a carbon steel version and from DN20 to DN65 in a stainless steel version.

Product features

The sensor protects the compressor against damage in the event of liquid hammer from the system.
Setting up the sensor using a PC allows for adjustments to match the system and the compressor.
Instantaneous reaction without delays.
Split design which makes it easy to install and perform diagnostics on.




Connection diagram

HBLC web 1

Pin 1 & 2: 24 V AC/DC. Pin 2 & 3: Alarm output. Pin 2 & 4: analogue output (data logging). Pin 2 & 5: Activation of sensor functionality.

Power supply
Voltage24 V AC/DC + 10%
Max. current consumption600 mA
Plug connectionM12 - DIN 0627
Transsistor outputPNP, 1 A
Contact functionNC or NO
Environmental conditions
Ambient temperature-30...+50°C
Refrigerant temperature-60...+80°C
Max pressure100 bar
Protection degreeIP65
VibrationsIEC 60068-2-6 (4g)
Mechanical specifications
Thread connection3/4”
Material - liquid partsAISI 304 / PTFE
Materiale - electronic partsNylon 6 (PA)
House designFront
EMC testEN 61000-2

Ordering code

Pipe diameterMaterialOrdering code
DN20Carbon HBCP-ST-DN20
DN25Carbon HBCP-ST-DN25
DN32Carbon HBCP-ST-DN32
DN40Carbon HBCP-ST-DN40
DN50Carbon HBCP-ST-DN50
DN65Carbon HBCP-ST-DN65
DN80Carbon HBCP-ST-DN80
DN100Carbon HBCP-ST-DN100
DN125Carbon HBCP-ST-DN125
DN150Carbon HBCP-ST-DN150
DN200Carbon HBCP-ST-DN200
DN250Carbon HBCP-ST-DN250
DN300Carbon HBCP-ST-DN300
Electronic Part for NO output HBCP-ST-EL-NO
DN20Stainless Steel HBCP-ST-DN20-SS
DN25Stainless Steel HBCP-ST-DN25-SS
DN32Stainless Steel HBCP-ST-DN32-SS
DN40Stainless Steel HBCP-ST-DN40-SS
DN50Stainless Steel HBCP-ST-DN50-SS
DN65Stainless Steel HBCP-ST-DN65-SS