Directed Electronics 3100 Operations Instructions download pdf (Page 8)

It functions even when exposed to strong external vibration or

changing products.

Solid detection in water

If OPTISWITCH 3100 C was ordered for solids detection in

water, the tuning fork is set to the density of water. In air or

when immersed in water (density: 1 g/cm³ / 0.036 lbs/in),

OPTISWITCH 3100 C signals "uncovered". Only when the

vibrating element is also covered with solids (e.g. sand,

sludge, gravel etc.) will the sensor signal "covered".

Fault monitoring

The electronics of OPTISWITCH 3100 C continuously mon-

itors the following criteria:

l Correct vibrating frequency

l Line break to the piezo drive

If one of these faults is detected, the electronics signals it via a

deﬁned current to the signal conditioning instrument. The

connection cable to the vibrating element is also monitored.

The tuning fork is piezoelectrically energised and vibrates at its

mechanical resonance frequency of approx. 150 Hz. When the

tuning fork is submerged in the product, the vibration

amplitude changes . This change is detected by the integrated

oscillator and converted into a switching command.

Depending on your requirements, OPTISWITCH 3100 C with

two-wire electronics can be connected to diﬀerent signal

conditioning instruments. Compatible signal conditioning in-

struments are listed under Technical data.

The exact range of the voltage supply is speciﬁed in the

Technical data in the Supplement.

3.3 Adjustment

With the factory setting, products with a density of >0.02 g/cm³

(>0.0008 lbs/in³) can be measured. It is possible to adapt the

instrument for products with lower density >0.008 g/cm³

(>0.0003 lbs /in³).

On the electronics module you will ﬁnd the following indicating

and adjustment elements:

l signal lamp for indication of the switching condition (green/

red)

l potentiometer for adaptation to the product density

l mode switch for selection of the output current

Physical principle

Power suppl y

8 OPTISWITCH 310 0 C - with two-wire output

Product description

29955-EN-060112

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