Appendix H: Application For Pointek Cls200/300 Standard; Level Detection; Alarm Signaling - Siemens Pointek CLS200 Operating Instructions Manual

Appendix H: Application for Pointek
CLS200/300 Standard

Level Detection

Note:
• For a more detailed explanation, please see
• For more detailed instructions on setting the dip switches and potentiometers,
Operation: Pointek CLS200/300 standard model
please see
The difference in capacitance between a covered probe and an uncovered probe (for
example, between a probe in water and a probe in air), is used to detect level, and to
protect the process from a level that is either too high or too low.
The trip point is set by potentiometer P2. This determines how large the difference in
capacitance needs to be before the output is switched. Dip switch 5 allows you to adjust
the sensitivity. The sensitive electronics can be set to detect the change in capacitance
either as the level approaches the probe tip, or when the probe is covered.

Alarm Signaling

Relay and Solid-state Switch
The relay and solid-state switch are interlinked: when the change in capacitance is
greater than the setting at the trip point, the output switches. (For a diagram illustrating
the relay and solid-state switch contacts, see page 25.)
Relay
Energized
De-energized
Alarm settings
The alarm can be set to protect the process from a level that is either too high or too low.
Overfill Protection =
alarm state
normal state
• high alarm:
• low alarm:
The setting is selected by turning dip switch 3 on or off.
1.
Or, if the trip point is set to detect the approaching level, when that trip point is reached.
Page 69 Pointek CLS200/300 Standard – INSTRUCTION MANUAL
Red LED
On
Off
Failsafe High
alarm ON/switch open when level is higher than the set point
(probe becomes covered
alarm ON/switch open when level is below the set point (probe
becomes uncovered)
Operating Principles
from page 24 onwards.
Solid-state switch
Closed
Open
Dry Run Protection =
Failsafe Low
normal state
alarm state
1
)
on page 32.
Alarm state
OFF
ON
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