Hengesbach L Vibration Level Fork Liquitec

Hengesbach L Vibration Level Fork Liquitec series consists of liquid-level switches for use in an EX-free operating environment.

Hengesbach L Vibration Application:

• Liquitec Standard with GIB threaded connection and welding socket, with O-ring seal, fork polishing optional
• Liquitec L Hygienic version with Tri-Clamp 2“, parts in contact with the medium have been polished

Features:

• short fork for minimum installation depth
• continuous operating temperature of up to 150°C and 100 bar gauge pressure
• 24 V DC PnP transistor output for connection to SPS / pls
• standardized version and hygienic design suitable for food and pharmaceuticals

Specification:

Operating conditions

The temperature of medium: -40ºC to +150ºC
Environmental temperature -40ºC to + 80ºC (+50ºC at +150ºC on medium side)
Pressure range: -0.25 bar to +100 bar at +50ºC
Specific weight: 0.6 to 2.0 viscosity range 0.2 to 10,000 cP
Switch point (water): 13 mm from the tip (vertical) and from the edge (horizontal) of fork
Hysteresis (water): +/- 1mm, nom. switching delay 1s dry / wet and wet / dry

Norms/regulations

CE conformity conditions have been fulfilled
Requirements according to EN 50081 (emission) / EN 50082-2 (immission),
EN 61326 Low-voltage guideline EN 61010-1 Pollution level 2,
Insulation material group II (264 max) and III (150 V max) conditions have been adhered to

A) Utilisation / installation
• The Liquitec vibration level fork is suitable for use in an EX-free environment.
• The device must be installed, operated and maintained by trained staff,
taking into account the usual and current national and local technical specifications.
• Before using the device, its suitability for the specific application must be checked.
• Product deposits of all kinds in the sensor area should be avoided.
• The correct sensor alignment (groove for fork orientation, see dimensional drawing above) must
be ensured.
B) Function / LED
• The range of functions and the LED display are indicated on the type label.

DRY = ON > Use as upper limit switch ( HI alarm )
WET = ON > Lower limit switch ( LO alarm / dry run protection)
The LED display installed as part of the electrical connections has a cycle time of 1 Hz under normal operating
conditions and displays ON; in the event of a short-circuit, the cycle time is reduced to 0.25 Hz, while in the
event of an internal fault it increases to 3 Hz.
C) Magnetic function test
• A provisional function test (closing/opening functions) can be carried out before installation by touching the
housing with a special bar magnet.
D) Electrical connection
• Before connecting the device, the type label must be identified once again, in order to determine the electrical
connection and the switch modes (2-wire load switch or PNP transistor switch). Technical connection data –
see table above.
• The adaptor supplied must be equipped with a suitable cable to achieve the protection class IP66 or IP67. The
The cable inlet should be orientated downwards to ensure leak-tightness.
• Warning for relay connection:
The level switch requires a minimum current of 3 mA, even when “OFF”.
When using a serially switched relay, care must be taken that the drop-out voltage of the relay
is greater than the voltage drop via the relay coil when the current is equal to 3 mA.

Download Data Sheet: Vibration Level Fork Liquitec L

Ref: hengesbach.com

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