Burkert Type 8111 Bedienungsanleitung PDF herunterladen (Seite 8)

3.2 Principle of operation

LEVEL SWITCH 8111 is a point level sensor with tuning fork for level

detection.

It is designed for industrial use in all areas of process technology and

can be used in liquids.

Typical applications are overﬁll and dry run protection. With a tuning

fork of only 40 mm length, LEVEL SWITCH 8111 can be also mounted

e.g. in pipelines from DN 32. The small tuning fork allows use in

vessels, tanks and pipes. Thanks to its simple and robust measuring

system, LEVEL SWITCH 8111 is virtually unaﬀected by the chemical

and physical properties of the liquid.

It functions even under diﬃcult conditions such as turbulence, air

bubbles, foam generation, buildup, strong external vibration or

changing products.

Fault monitoring

The electronics module of LEVEL SWITCH 8111 continuously

monitors via frequency evaluation the following criteria:

l Strong corrosion or damage on the tuning fork

l Loss of vibration

l Line break to the pie zo drive

If one of these faults is detected or if the power supply fails, the

electronics takes on a deﬁned output st atus (safe condition).

The tuning fork is piezoelectrically energised and vibrates at its

mechanical resonance frequency of approx. 1200 Hz. The piezos are

ﬁxed mechanically and are hence not subject to temperature shock

limitations. The frequency changes when the tuning fork is covered by

the medium. This change is detected by the integrated electronics

module and converted into a switching command.

LEVEL SWITCH 8111 is a compact instrument, i.e. it can be operated

without external evaluation system. The integrated electronics

evaluates the level signal and outputs a switching signal. With this

switching signal, a connected device can be operated directly (e.g. a

warning system, a pump etc.).

The data for power supply are speciﬁed in chapter "Technical data".

3.3 Operation

The switching condition of LEVEL SWITCH 8111 can be checked

when the housing is closed (signal lamp). With the basic setting,

products with a density > 0.7 g/cm³ (0.025 lbs/in³) can be detected.

The instrument can be adapted if products with lower density should

be measured.

On the electronics module you will ﬁnd the following indicating and

adjustment elements:

Appli

cation area

Func

tional principle

Volta

ge supply

8 LEVEL SWITCH 8111 • with NAMUR output

3 Product description

32048-EN-120418

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