Liquid Level Sensor

Technical data: HBLT-W-Wire & HBSLT-W-Wire

HBLT-W-Wire is a capacitive sensor for level measurement of NH3 refrigerant in industrial refrigeration systems.The sensor has an output signal of 4-20 mA, which is proportional with 0 and 100%.Its output signal is 4 mA for an empty container and 20 mA for a full container.HBLT-wire can be adjusted in length to the current application.The sensor element consists of a 2mm steel wire as well as a Teflon tube. Both parts are provided with a length of 4 m and can be shortened with diagonal cutters or other pliers. HBLT-wire can be used in connection with the HBLT-C1 controller for controlling pumps.

The sensor is delivered in a version without integrated cable (named HBLT-W-Wire) and a version with cable for direct control of valves (named HBSLT-W-Wire).

HBLT-W-Wire - Counterweight with adjustable center position spring

Under turbulent conditions, the counterweight for the HBLT-W-Wire can be supplied as a spare part with an adjustable center position spring. The center position spring is delivered with cutting marks so it can be adapted and cut to the dimension of the stand pipe.                                                        HBLT WIRE Counterweight 2217 fritlagt hvid baggrund Web

Product features

Flexible sensor wire, which is adjustable to a length of 600 to 4000 mm.
Sturdy and reliable design with a standard 4-20 mA output signal.
Designed for the refrigeration industry – max. pressure up to 100 bar.
Split design which makes the sensor easy to install and service. The electronic part can easily be separated from the mechanical part by loosening the threaded union.
Simple calibration for the specified length.
Alarm output can be set in a range from 10% to 100%.
Compact design that minimises shipment costs.
Can be used for marine applications, since measurement is not affected by contact with the metal surface of the overflow pipe.
Measures NH3 & HFC refrigerants (R22, R134A, R404A, R410A, R507, R717 & R718).


When using a level sensor for measuring Ammonia in a compact plate and shell heat exchanger or other systems with turbulent conditions, we have new recommendation based on recent experience:

For Stand-pipes with stable conditions (smooth changes in the level):

• Use a HBLT-Wire or a HBLT-A2 rod-style sensor.

For Stand-pipes with turbulent conditions (a lot of turbulence, cooking, foaming, liquid from the top):

• Use a HBLT-A2 rod-style sensor, or

• Use only a HBLT-Wire sensor when you have it mounted in an inner guide-tube of e.g. DN25 as illustrated. 
The guide-tube will dampen the turbulence and the foaming and you will have a good measurement.

• If the HBLT-Wire sensor is already mounted under these conditions WITHOUT a guide-tube,
do eventually set the filter time function between 60-120 seconds to dampen the signal from the turbulent conditions.

For Alfa Laval U-turn evaporator: Use a HBLT-A2 rod-style sensor.


Connection diagram

HBLC web 1

The sensor can be programmed to either emit a linear signal, which is identical to the tank level, or to regulate a valve for the purpose of obtaining the same level in the tank (float valve).


HBLT Wire measure

Power supply
Voltage24 AC/DC + 10%
Current consuption - sensor only*Max 600 mA
Plug connectionM12, 5 pins - DIN 0627
Analog output 4-20 mA
Alarm output1A (24V DC)
LED indicationGreen, yellow, and red
Max. possible resistance500 ohm
Environmental conditions
Ambient temperature-30...+50°C (IP version: -60...+50°C)
Refrigerant temperature-60...+80°C
Max. pressure100 bar
Protection degreeIP65
VibrationsIEC 68-2-6 (4g)
Mechanical specifications
Thread connections3/4” NPT/BSPP
Material – mechanical partsAISI 304 / PTFE
Material - electronic partsNylon 6 (PA)
DimensionsSee drawing
CEEN 61000-2
EAC Regulation of Conformity
Cable specification (power supply)
Cable size5 m - 3 x 0.25 mm2
Cable glandsPG7 / M8
Cable resistance500 Ω/Km
Type of configurationHB Tool/HMI
Tool to be usedHBLT-Wire software
Adapter - 3/4” NPT / 1” BSPPHBS/ADAP/8/2
Adapter - 3/4” BSPP / 1” BSPPHBS/ADAP/8/6
Configuration toolHBxC-Splitbox
Plug converterHBxC-M12/DIN
* Total consumption is sensor consumption plus output and it depends on ambient temperature.

Ordering code

LengthThread typeValve typeOrdering code
600-4000 mm 3/4" NPTHBLT-W-Wire-2
600-4000 mm 3/4" BSPPHBLT-W-Wire-6
600-6000 mm 3/4" NPT HBLT-W-Wire-6-2
600-6000 mm 3/4" BSPPHBLT-W-Wire-6-6
Electronic part for HBLT-Wire HBLT-Wire-EL
600-4000 mm 3/4" NPTModulatingHBSLT-W-Wire/C-2
600-4000 mm 3/4" BSPPModulatingHBSLT-W-Wire/C-6
600-6000 mm 3/4" NPT ModulatingHBSLT-W-Wire/C-6-2
600-6000 mm 3/4" BSPPModulatingHBSLT-W-Wire/C-6-6
Electronic part for HBSLT-Wire/C ModulatingHBSLT-WIRE/C-EL
600-4000 mm 3/4" NPTStepperHBSLT-W-Wire/S*-2
600-4000 mm 3/4" BSPPStepperHBSLT-W-Wire/S-6
600-6000 mm 3/4" NPT StepperHBSLT-W-Wire/S--6-2
600-6000 mm 3/4" BSPPStepperHBSLT-W-Wire/S-6-6
Electronic part for HBSLT-Wire/S StepperHBSLT-WIRE/S-EL
600-4000 mm 3/4" NPTPWMHBSLT-W-Wire/PWM-2
600-4000 mm 3/4" BSPPPWMHBSLT-W-Wire/PWM-6
600-6000 mm 3/4" NPT PWMHBSLT-W-Wire/PWM-6-2
600-6000 mm 3/4" BSPPPWMHBSLT-W-Wire/PWM-6-6
Electronic part for HBSLT/S-Wire/PWM PWMHBSLT-WIRE/PWM-EL
600-4000 mm 3/4" NPT HBLT-W-Wire-2-IP**
600-4000 mm 3/4" BSPP HBLT-W-Wire-6-IP
Electronic part for HBLT-Wire HBLT-Wire-EL-IP
1"BSPP -> 3/4"BSPP adapter with alu gasket HBS/ADAP/8/6
Counterweight for HBLT-Wire HBLT-W-COUNTERWEIGHT
*Stepper motor & IP versions are without display.
**HBLT-WIRE-IP is a low temperature version.


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