NH3/CO2 Leakage Switch

Technical data: HBAC

HBAC is used for detecting leakage in cascade systems. The sensor triggers an alarm if there is an CO2 leak in the NH3 part. A leak results in several hours of cleaning the pipes and heat exchanger. If a CO2 leak occurs in the NH3 part, salt crystals are formed. These salt crystals are very corrosive and lead to clogging of the parts. If the leak is not stopped in time, it can lead to extensive damage to
the heat exchanger, pipes, and pump.

The sensor detects even very small leaks.

Product features

CO2 leakage detection in NH3 cascade heat exchanger
Simple to install with a sleeve. A cost-optimized solution
LED indication for power and alarm status
Single Shared design that make it easy to install and diagnostics. The electronic part can be easily removed from the mechanical part by two small screws.




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. 



L = 160 mm

Power supply
Voltage24 V AC/DC + 10%
Max. current consumption50 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 68-2-6 (4g)
Mechanical specifications
Thread connection3/4”
Material - liquid partsAISI 304 / PTFE
Materiale - electronic partsNylon 6 (PA)
Weight470 g
House designFront
EMC testEN 61000-2

Ordering code

OutputThread typeOrdering code
NO3/4" NPTHBAC-1.6-NO-2
NC3/4" NPTHBAC-1.6-NC-2
NO3/4" BSPPHBAC-1.6-NO-6
NC3/4" BSPPHBAC-1.6-NC-6
NOElectronic Part for HBAC-NOHBAC-EL-NO
NCElectronic Part for HBAC-NCHBAC-EL-NC
Insert length: 150 mm3/4" NPTHBAC-1.5-2-MK2
Insert length: 150 mm3/4" BSPPHBAC-1.5-6-MK2
Insert length: 300 mm1" BSPPHBAC-3-8-MK2
Insert length: 300 mm1" NPTHBAC-3-9-MK2
Electronic Part for HBAC-MK2Spare PartHBAC-EL-MK2


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