Manual for rigid level sensors and controllers Covers: HBLC, HBLT, HBSLC & HBSLT For analog measurements of liquids like NH3, water, HFC/HFO refrigerants, CO2, Hydro carbons and alcohols. Can be used in refrigeration systems and similar demanding systems. ATEX/Ex versions included Introduction HBLC, HBLT , HBSLC and HBSLT are intelligent liquid level sensors which can be installed in a vessels or in a standpipes. The sensors can be mounted directly in a stand pipe or in a vessel.
Table of contents Introduction ............................................................................................... 1 Safety Instructions ..................................................................................... 2 Application Examples ............................................................................. 3-4 Installation Instructions ............................................................................. 6 How to connect the sensor ........................................
Application Examples HBLC and HBSLC HBLC consist of a PTFE covered rod and requires a electrical connection to the overflow pipe or to the pipe segment where it is installed. The sensor is more sensitive to turbulent conditions but with a high filter time it is able to control the level even in turbulent conditions. The simple design is less sensitive to contamination compared to HBLT. HBSLC connected to a modulating valve – an alternative to low pressure float control.
Application Examples HBLT and HBSLT are designed for level measurement of liquids and is typically used in chillers, pump separators, coolers and condensers. The sensors can be mounted in vessels , containers and standpipes without an external pipe. HBSLT/C Sensor with integrated cable for direct control of 4-20 mA controlled modulating valve like Siemens MVS-series or Danfoss ICM-series or similar. LED display is included HBSLT/S Sensor with integrated cable for direct control of stepper motor valves.
Application Examples HBLC and HBSLC Level sensor installed directly in a vessel Level sensor installed in a standpipe connected to a receiver. Rigid level sensor manual 04 June2022 HBproducts.
Installation Instructions Mount the sensor rod in a standpipe or vessel with the right thread connection. Liquid sealant is used for sensors without an outer pipe and the conic NPT thread. For the BSPP threads a washer is used. Teflon tape can be used on versions with an outer pipe. CAUTION! In case of welding work on the unit, we recommend to remove the electronic head or at least to make sure that proper earthing is carried out to avoid damaging the electronics.
Suited for Connection diagram for simple sensor Sensors with simple electronic head • 3 1 2 1 +24V DC or AC + 2 - - Common 3 AO, 4-20 mA level PLC AI 4 Communication only used for setting up and calibration Connection diagram for sensors without control cable.
How to connect the sensor Three different type of sensors • A simple sensor version with 4-20 mA output • A advanced sensor version with 4-20 mA output, LED indications, display and multiple settings • A controller version with both cable for direct valve control and analog output, LED indications, display and multiple settings The M12 connection is also used for power supply. Some versions are able to control a valve directly. They have a cable, which can be connected directly to the valve.
Connection diagram for sensors with control cable for all common stepper motor valves — here shown with Carel E2V Suited for • HBSLT/S and HBSLT–wire/S • HBSLC/S 1 +24V DC or AC + 2 - Common - 3 AI Remote set point 4-20 mA AO 4 AO, 4-20 mA level AI 5 Run in signal DO PLC The sensor has a build in controller for a stepper valve. The sensor provides both the analog output via the cable to control the valve. The level measurement signal for the PLC comes via the M12 plug .
Connection diagram for sensors with control cable for pulse modulating valve — here shown with Danfoss AKV/AKVA Suited for • HBSLT/PWM and HBSLT–wire/PWM • HBSLC/PWM 1 +24V DC or AC + 2 - Common - 3 AI Remote set point 4-20 mA AO 4 AO, 4-20 mA level AI 5 Run in signal DO PLC The sensor has a build in controller for a pulse modulating valve. The sensor provides both the analog output via the cable to control the valve. The level measurement signal for the PLC comes via the M12 plug .
Connection diagram for sensors with control cable for modulating valve — here shown with Siemens MVS661 Suited for • HBSLT/C and HBSLT–wire/C • HBLC/C MVS661 motor valve - = White common G0 -common + = Brown Supply G + supply AO = Grey , 4-20 mA Y mA input M Open Close Motor valve: 4-20 mA 24 V DC, max 24 W U mA output position ZC Open/Close valve 3 wire connection Manual open/close 1 +24V DC or AC + 2 - Common - 3 AI Remote set point 4-20 mA AO 4 AO, 4-20 mA level AI 5 Run in
Connection diagram for sensors with EX approval and two wire connection Suited for • HBLT and HBLT-wire • HBLC 1 +24V DC Barrier + 2 Not used AI 3 Not used AO 4 AO, 4-20 mA level AI 5 Not used DO PLC The sensor with ATEX approval use a two wire connection. This means only two pins in the M12 connector are active and the output is a 4-20 mA analog signal.
Setting up the sensor When the sensor is delivered with one of the predefined liquids it is pre-calibrated and need no further calibration. The simple sensor can still be setup using a simple tool where filter time and calibration can be made. The advanced sensors has multiple parameters. All sensor are connected to a PC using an USB/M12 cable and the simple sensor need an additional adapter.
Use the HB tool for setting up the sensor Advanced versions only Setup — level or control The sensor can operate in two different modes • As sensor input to a PLC, computer or other device that Setting up the sensor The HB tool has three pages of settings. Some fields will be shown in grey when they are not relevant/active with the setting chosen. Detailed explanations of the individual fields will show up when the mouse is moved over the field. Only the latest version of the tool has this feature.
Basic settings Filter time averages the output over a period and reduce fluctuations Here you make the primary settings of the sensor Here you set the parameters for the control function. Here you set the parameters for the sensor When “Run in signal” is set to off the sensor control continuously when set to on, control only when signal is applied on pin5 Here you set the alarm level. This is only for versions without cable for valve control Zero & span.
Advanced settings Here you make the advanced settings of the sensor Here you set the parameters for the alarm function. Only available for sensors without cable Here you can adjust parameters for the valve control Alarm relay function: Here, the relay function is indicated, depending upon the instructions – NO or NC (normally open/normally closed).
Diagnostic (calibration of sensor) Here you make the calibration of the sensor. If the sensor is operating in one of the predefined liquid it is delivered with a calibration and does normally not need further calibration. If you need higher accuracy the sensor can be calibrated Here you can see and change the zero calibration.
LED indication • Green LED indicates 24 V DC supply; it flashes during operation. If "run-in" is not used, this function must be deactivated in the tool. • Yellow LED indicates control. The flashing sequence indicates if the valve is closing or opening. • Red LED indicates high- or low-level alarm, depending upon the setup. 3-digit display: (not available on /S stepper motor control version.) Showing 0…100 % linearly corresponding to 4…20 mA.
Fault detection General: In case of fault, it is normally enough to replace the electronic part. Fault Reason Correction of fault No LED is on / not operating. No supply to the sensor or defective cable/plug Check and find faults in the power supply, or replace the supply cable. Yellow and red LED flash. Power supply is not sufficient. Install proper power supply. Valve open and close to fast.
Quick guide Installation The sensor is installed in the vessel using liquid sealant or PTFE tape like shown in the manual and the electrical unit is connected. If the electronic unit has the threaded union, make sure it is firmly tightened to secure good electrical connection. Setup The sensor is delivered pre-calibrated for the liquid you specified when ordering and ready for use. To obtain a more accurate measurement you need to calibrate the sensor as described in the complete manual.
