HB Products HBSC2 User manual

Quick guide –switches with circular electronic unit 08 December 2021
Standard switches available from HB-products
Liquid switches
Oil Switches
Quick guide
All liquid level switches with circular electronic unit HBSC2, HBSR, HBOR & HBSO
Functionality and labelling:
The switches are used for detecting liquid in gas or air (HBOR detect oil in liquid
ammonia). The mechanical elements have different design because they are
optimized to different liquids. The switches use the capacitive measuring principle
and react to the difference in dielectric constant between liquid and gas.
The switches have different calibration and parameter settings in the electronic
unit, but unit is the same. The settings cannot be changed by the user, and it must
match the mechanical part. Switches delivered after September 2020 has a build
in heater which will be in operation below 5°C to keep the sensor dry
The switches are delivered as NO/NC and NPN/PNP connection. The switches
setting is printed on the small silver label on the switch together with the type
code. On the same label you find a combined version number and manufacturing
date and in second row a unique production number.
Version: VU10 date: 080319 DDMMYY
Production no. 400000
Type: HBSO1 configuration: PNP/NO

Quick guide –switches with circular electronic unit 08 December 2021
LED indication
4 x red LED´s indicate liquid/oil detection.
4 x green LED´s flashing indicate no detection, but sensor is active.
4 x red flashing LED´s indicate no connection to mechanical unit.
Irrespective of the output function (NO/NC) LED´s are activated
when liquid is detected.
Mechanical installation
The switch is installed in a vessel or compressor, using Teflon tape or
liquid sealant, for those with NPT thread.
When installing the switch in cold conditions,
where the liquid has high viscosity, make sure
liquid can drain from the switch. This can be done
by sloping the switch 5 degrees downwards.
Long weld adapters should be avoided because gas
pockets can build up and disturb the measurement
Switches pointing upwards can collect liquid which
disturb the measurement
Mounting the electronic unit
The electronic unit is mounted with either a threaded union or with two set of
screws in a V-track. The threaded union is mainly used for switches operating in
cold conditions. The set screws are tightened with a torque of 5 Nm and the
threaded union is tightened firmly by hand or by using pliers to secure a good
electrical connection. For cold installations where condensation occur the treaded
union should be used to avoid poor contact between electrical contact between
mechanical and electrical unit.
Electrical connection
The switch is predefined as NO (normally open) or NC (normally closed) and this
refers to the contact in the switch, in dry condition.
The switch is either PNP or NPN type and the connection must be done according
to the drawing. Switches can be supplied with AC, but the output will be DC
Switching
All switches except HBOR switch
on when liquid is detected. This
means a NO switch close the
contact when liquid is detected,
and a NC open the contact when
in liquid. HBOR is different: it
switches off when oil is detected
Electrical specifications
Connector: DIN 43650/ISO4400
Relay current max 50 mA
Supply AC/DC 24V ± 10 %
More information
For further information please download the instruction manual from our
homepage: www.hbproducts.dk.