fafnir SEPARIX-C L Plus, Technical Documentation Manual

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Page 3/37 SEPARIX-C/-T and SEPARIX-Control CT
3 The SEPARIX sensors
3.1 Design and function …
3.1.1 … of the interface sensor SEPARIX-C L Plus
The SEPARIX-C L Plus interface sensors, in conjunction with the SEPARIX-Control CT meas-
uring transducer, form an automatic warning device for light liquid separators. The warning
system responds to a change in the thickness of the oil / light liquid layer. It generates an
alarm signal before the automatic closure device shuts off the outlet of the separator due
to a high oil / light liquid level.
The SEPARIX-C L Plus is not permitted to be used in aggressive media.
The sensor works according to the capacitive measuring principle: To detect the interface,
it uses the difference between the relative dielectric constant of water and of light liquids,
e.g. oil. The measurement on the SEPARIX-C L Plus is made over the entire surface of the
6 cm long measuring range. This helps to achieve
significant insensitivity to contaminations that could
otherwise trigger false alarms.
The typical switch point is approximately 40 mm
above the sensor tip. Depending on the degree
of contamination, it may shift 10–20 mm upwards
(within the safe zone). In the event of heavy con-
tamination, which, due to the nature of operation,
cannot always be avoided even with regular mainte-
nance, no false alarm is triggered (without the
presence of a light liquid layer). Instead, the alarm
is triggered at a slightly reduced layer thickness.
The SEPARIX-Control CT measuring transducer
powers the sensors and evaluates the sensor sig-
nals.
Switch point
40
92
195
∅
28
∅
24
Figure 1: SEPARIX-C L Plus, dimensions