Vapor quality sensor (DX systems)

Technical data: HBX-DX

HBX-DX is a new revolutionary, patent-pending sensor technology, and it is thus the first sensor in the world capable of measuring the relationship between vapor and liquid a refrigeration system. The sensor measures the degree of dryness, “X”, of the gas in the gas pipes, and the value is converted into a 4-20 mA analogue signal corresponding to “X”. The HBX-DX measures the dryness of the gas in the range X = 0.85...1.05.
The sensor is available in two variants, "Rod Style” for installation in a pipe elbow and “In-line” for welding into the suction pipe.

The sensor offers very precise measurements and provides instant read-outs of the gas quality, making it useable in most evaporators (plate, pipe, and air evaporators).
The sensor’s microprocessor also functions as a controller, enabling the direct control of a modulating motor valve, thereby bypassing the external controller or the PLC. The controller can be set up with all the parameters that are necessary for regulating a modulating motor valve or a stepper motor valve. The sensor is available with a cable for direct supply to and control of the motor valve, or as a sensor where the signal is sent to the external controller/PLC.

The sensor cannot measure actual overheating, but with proper installation and system design, overheating can be reduced or eliminated, thus leading to substantial energy savings. 

Product features

The vapor quality sensor allows for the operation of DX ammonia technology with minimal "superheat".
A dry suction pipe from the freezer minimises loss of pressure in risers and provides increased flexibility of the pipe installation. 
30 to 50 times less refrigerant required (ammonia systems), following the installation of the vapor quality sensor and the construction of the system based on DX technology.
Measures vapor quality in refrigeration systems – measures the relationship between gas and liquid (Refrigerant Log Ph diagram).


Applikation til HBX DX OVC

Fordamperkasse2 HBX WEB


Connection Diagram



Maal HBX Rod 1 tommer O28mm

Maal HBX Rod 3 4 tommer o22mm

Maal HBX Rod 3 4 tommer O22mm L192mm

HBX-Rod style

Maal HBX Inline

HBX-In-line style

HBx Strainer DN65 WEB

Installation of HBX rodstyle in strainer/filter houses

For proper functionality of X-sensor it is vital with correct installation. This has proven to be challenging when welded in to bends. We are therefore ready with a new solution with integration in strainer houses mounted at the suction line. The function is as on the inline sensor but the advantage is that the filter lid and sensor element can be removed and cleaned if necessary.

HBX strainer dimensioner web

HBx strainer dimensionstabel web


Power supply
Voltage24 AC/DC + 10%
Max. possible resistance500 ohm
Plug connectionDIN 43650 - 4 pins
Analog output 4-20 mA
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 connections3/4” NPT & 1" BSP
Material - liquid partsAISI 304 / PTFE
Material - electronic partsCoated aluminium
House typeFront
EMC testEN 61000-2
ConfigurationPush bottom
LED indicationRed LED

Ordering code

DesignLengthConnectionValve typeCable to valveOrdering code
Rod190 mm3/4" NPTModulatingNoHBX-DX-R-2-2
Rod190 mm3/4" BSPPModulatingNoHBX-DX-R-2-6
Rod300 mm3/4" NPTModulatingNoHBX-DX-R-3-2
Rod300 mm3/4" BSPPModulatingNoHBX-DX-R-3-6
Rod300 mm1" BSPPModulatingNoHBX-DX-R-3-8
Rod300 mm1" NPTModulatingNoHBX-DX-R-3-9
In-line 1" DN25ModulatingNoHBX-DX-IN-DN25
In-line 1 1/2" DN40ModulatingNoHBX-DX-IN-DN40
In-line 2" DN50ModulatingNoHBX-DX-IN-DN50
Electronicpart forHBX-DXModulatingNoHBX-DX-EL
Rod190 mm3/4" NPTModulatingNoHBX-DX-R-2-2-MK2
Rod190 mm3/4" BSPPModulatingNoHBX-DX-R-2-6-MK2
Rod300 mm3/4" NPTModulatingNoHBX-DX-R-3-2-MK2
Rod300 mm3/4" BSPPModulatingNoHBX-DX-R-3-6-MK2
Rod300 mm1" BSPPModulatingNoHBX-DX-R-3-8-MK2
Rod300 mm1" NPTModulatingNoHBX-DX-R-3-9-MK2
Electronicpart forHBX-DX-MK2ModulatingNoHBX-DX-MK2-EL
Rod190 mm3/4" NPTModulatingYesHBX-DX/C-R-2-2
Rod190 mm3/4" BSPPModulatingYesHBX-DX/C-R-2-6
Rod300 mm3/4" NPTModulatingYesHBX-DX/C-R-3-2
Rod300 mm3/4" BSPPModulatingYesHBX-DX/C-R-3-6
Rod300 mm1" BSPPModulatingYesHBX-DX/C-R-3-8
Rod300 mm1" NPTModulatingYesHBX-DX/C-R-3-9
In-line 1" DN25ModulatingYesHBX-DX/C-IN-DN25
In-line 1 1/2" DN40ModulatingYesHBX-DX/C-IN-DN40
In-line 2" DN50ModulatingYesHBX-DX/C-IN-DN50
Electronicpart forHBX-DX/CModulatingYesHBX-DX/C-EL
Rod190 mm3/4" NPModulatingYesHBX-DX/C-R-2-2-MK2
Rod190 mm3/4" BSPPModulatingYesHBX-DX/C-R-2-6-MK2
Rod300 mm3/4" NPModulatingYesHBX-DX/C-R-3-2-MK2
Rod300 mm3/4" BSPPModulatingYesHBX-DX/C-R-3-6-MK2
Rod300 mm1" BSPPModulatingYesHBX-DX/C-R-3-8-MK2
Rod300 mm1" NPTModulatingYesHBX-DX/C-R-3-9-MK2
Electronicpart forHBX-DX/C-MK2ModulatingYesHBX-DX/C-EL-MK2
Rod190 mm3/4" NPTStepper motorYesHBX-DX/S-R-2-2
Rod190 mm3/4" BSPP Stepper motorYesHBX-DX/S-R-2-6
Rod300 mm3/4" NPTStepper MotorYesHBX-DX/S-R-3-2
Rod300 mm3/4" BSPPStepper MotorYesHBX-DX/S-R-3-6
Rod300 mm1" BSPP Stepper motorYesHBX-DX/S-R-3-8
Rod300 mm1" NPT Stepper motorYesHBX-DX/S-R-3-9
In-line 1" DN25Stepper motorYesHBX-DX/S-IN-DN25
In-line 1 1/2" DN40Stepper motorYesHBX-DX/S-IN-DN40
In-line 2" DN50Stepper motorYesHBX-DX/S-IN-DN50
Electronicpart forHBX-DX/SStepper motorYesHBX/S-EL
Rod190 mm3/4" NPTPWMNoHBX-DX-R-2-2/PWM
Rod190 mm3/4" BSPPPWMNoHBX-DX-R-2-6/PWM
Rod300 mm3/4" NPTPWMNoHBX-DX-R-3-2/PWM
Rod300 mm3/4" BSPPPWMNoHBX-DX-R-3-6/PWM
Rod300 mm1" BSPPPWMNoHBX-DX-R-3-8/PWM
Rod300 mm1" NPTPWMNoHBX-DX-R-3-9/PWM
Electronicpart forHBX-DX/PWMPWMNoHBX-DX/PWM-EL
Rod190 mm3/4" NPTPWMYesHBX-DX/C-R-2-2/PWM
Rod190 mm3/4" BSPPPWMYesHBX-DX/C-R-2-6/PWM
Rod300 mm3/4" NPTPWMYesHBX-DX/C-R-3-2/PWM
Rod300 mm3/4" BSPPPWMYesHBX-DX/C-R-3-6/PWM
Rod300 mm1" BSPPPWMYesHBX-DX/C-R-3-8/PWM
Rod300 mm1" NPTPWMYesHBX-DX/C-R-3-9/PWM
Electronicpart forHBX-DX/C/PWMPWMYesHBX-DX/C/PWM-EL