Application: Pointek Cls500; Product Or Interface Detection - Siemens Pointek CLS500 Operating Instructions Manual

Capacitance switches
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achievable resolution of the measurement, since any change in level will be greater
relative to the length of the measurement section.
The entire Pointek CLS500 transmitter is potted in epoxy resin as part of the intrinsic
safety protection. The potting also protects the electronics against mechanical vibration
and moisture influences.
The transmitter is connected to the electrode by a mini coaxial cable, and grounded to a
connection point inside the enclosure. The external ground lug on the enclosure provides
a means of connecting the instrument system ground to a grounded tank. (For more
detailed information on grounding requirements, please see Grounding Examples,
page 35.)
The measuring range of Pointek CLS500 is 0 to 330 pF (1.0 pF  10
For safety purposes, and to ensure reliable measurement signals, the external
Note:
ground lug provided on the Pointek CLS500 enclosure must be firmly connected by an
adequate cable to the grounded vessel.

Application: Pointek CLS500

Pointek CLS500 has two modes of operation:
FailSafe High or Low mode (FSH or FSL)
Free Programming Mode (FPM)
Pointek CLS500 is most often used in FailSafe High/Low mode. This links the settings for
triggering an alarm and a fault signal, so that you do not have to set each parameter
individually: in effect, it acts as a shortcut.
Free Programming Mode allows each parameter to be set independently. In this mode,
the continuous mA signal is available. FPM mode is less often employed with
Pointek CLS 500.

Product or Interface detection

The capacitance of the electrode system is dependent on the dielectric constant of the
product surrounding the probe. By comparing the capacitances resulting from different
products with different dielectric constants, it is possible to determine what product is
surrounding the probe.
For products that mix together:
Contamination of one product by another can be measured:
100% product A
100% product B
Values in between 4 and 20 mA represent the ratio of the two products
For products that do not mix:
The interface between two products can be detected by the change in capacitance from
one product to the other.
1.
Continuous measurement is only available in Free Programming Mode.
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4 mA
20 mA
Pointek CLS500 – INSTRUCTION MANUAL
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