Design And Function - WIKA OLS-F1 Operating Instructions Manual

2. Design and function

2. Design and function
2.1 Description
This instrument is used for the
detection of limit levels in liquids. The
measuring principle is independent
of refractive index, colour, density,
conductivity and dielectric constant.
The switches consist of an infrared LED
and a phototransistor. The light of the
LED is directed into a prism. So long as
the sensor tip of the prism is in the gas
phase, the light is reflected within the
prism to the receiver. When the liquid
in the vessel rises and wets the glass
tip, the infrared lightbeam into the liquid
is interrupted and only a small portion
reaches the receiver.
The optoelectronic sensor OLS-F1 was specifically designed for
sanitary applications and is suitable for a wide range of applications.
Autoclavable applications can be performed up to a temperature of
134 °C.
2.2 Instrument construction
The instruments are fitted with different hygienic process
connections. These contain a glass prism and the electronics
responsible for the evaluation with an O.C. PNP transistor output.
The electrical connection is made via a 4-pin M12 circular connector.
With the connector version, the sensor can be covered with the
included protection cap to enable cleaning in the autoclave at
saturated steam conditions of 134 °C.
WIKA operating instructions model OLS-F1
Operating principle
Gas
Liquid
EN
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