Type 8111

9 | 10

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7.

Product operation

7.1. Measuring principle

The tuning fork is piezoelectrically energised and vibrates at a mechanical resonance frequency of approx. 1200 Hz. When the tuning fork is

submerged in the product, the frequency changes. This change is detected by the integrated oscillator and converted into a switching

command.

The integrated fault monitor detects the following faults:

• Interruption of the connection cable to the piezoelectric elements

• Extreme material wear on the tuning fork

• Breakage of the tuning fork

• Absence of vibration.

If one of these faults is detected or in case the power supply fails, the electronic system switches to a defined switching state, e.g. the relay

de-energises (safe state).

8.

Product accessories

Note:

The accessories must be ordered separately, see chapter “9.4. Ordering chart accessories” on page 10.

Accessory

Description

ø 21.3mm

G1

NPT1

AF41

Lock fitting

Terminal screws

(3 pcs.)

The lock fitting is a threaded fitting and can be used together with

the vibration level switch Type 8111. It must only be used in

unpressurised vessels.

The wetted parts of the lock fitting are made of stainless steel

(316L).

With the lock fittings, sensors with tube extension can be fixed

infinitely. The terminal screws protect the tube against sliding

through.

The following versions are available:

Ø 21.3 mm - G 1 or 1 NPT (AF 41)

9.

Ordering information

9.1. eShop

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