Vapor Quality Sensor, Angle Rod


The Vapor Quality Sensors have a new innovative technology which makes it possible to measure the mix between gas and liquid in a refrigerant from 0% gas to 100 % gas - a measurement no other sensor can provide. It consists of a tube, with metal inserts, where the mix of two phases pass through. The sensor measures the dielectric constant of the fluid, and as two different phases (liquid/gas) has different dielectric constant, the mix between the two, can be calculated. The output of the sensor is the “X” value which has a linear relation to the Volume % of liquid in the gas

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.

All vapor quality sensors are suitable for controlling both DX, semi flooded and flooded operation.

Angle rod
The sensor is suited for smaller systems and is made in stainless steel. It accepts flow in both directions and is suited for all common refrigerants. For HFC/HFO’s you need to pick an over sized sensor to keep down pressure loss. The sensor comes with reductions to compensate for a restricted flow area as standard. The sensor is made in stainless steel and can be butt welded (TIG) or brazed into the system. The sensor element can be removed and cleaned if necessary. The sensor is available from ¼” to 1” pipe size.

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Product features

Measures the volumetric concentration of gas in a gas/liquid mixture
Balanced evaporator control to achieve semi-flooded operation with high heat transfer
Able to control an expansion valve directly with simultaneously analog 4-20mA output to a PLC
Can be used to optimize and control both DX systems and overfeed systems
Instant measurement and analog output
Can be used for all common refrigerants


Fordamperkasse SS





 HBX SS mål web700                              HBX SS mål hoved web250


 HBX dimensions

Power supply
Voltage24V AC/DC
Current consumption- sensor only*250 mA with heater
Electronic connectionDIN Plug or M12, 3p
Output signal ”X” 0.8 to 1.04-20 mA / 0-10 V
Valve output, S or C or PWMStepper motor, mA, PWM
EMCEN 61000-2
Environmental conditions
Ambient temperature-40...+50°C
Refrigerant temperature-55...+50°C
Max. pressureMax 120 bar
VibrationsIEC 68-2-6 (4G)
Mechanical specifications
SizePlease see drawing
MaterialAisi304, PA6
House typeFront
Valve control (Modulating valve)
Signal to valve4-20 mA
Valve regulationPI-regulation
Valve control (PWM)
Signal to valve24V AC/DC
PWM period0-120 s (default 6 s.)
Valve control (Stepper motor)
Stepper motor steps25-5000 steps
Stepper motor speed2-40 m/s
Stepper motor phase current0-750 mA
Stepper motor holding current0-250 mA
Cable specification (valve control)
Length3 m (118”)
Cable size3 x 0.75 mm2
Cable glandsPG7 / M8
* Total consumption is sensor consumption plus output and it depends on ambient temperature.

Ordering code

Pipe diameterCO2 and other refrigerantsHFC/HC/HFOOrdering code
7/8”AvailableNot availableHBX*
* This list shows the sizes and steel types available. The ordering code is not complete until the desired specifications for the product is filled in in the "Product Specification Form" (see below).
For inquiries and orders please fill in the "Product Specification Form" (find it under the "downloads" tab on this product page) and e-mail it to


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