Appendix H: Application For Pointek Cls200/300 Standard; Level Detection; Alarm Signaling - Siemens POINTEK CLS200 Manual De Arranque Rápido

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 Standard model
please see
Operation: Pointek CLS300 Standard model
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. 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 29 for the CLS200 or page 35 for the
CLS300.)
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
7ML19985JH04 Pointek CLS200/300 Standard – OPERATING INSTRUCTIONS
Red LED
On
Off
Failsafe High
Operating Principles
(starting on page 28) or
(starting on page 34).
Solid-state switch
Closed
Open
Dry Run Protection =
Failsafe Low
normal state
alarm state
on page 42.
Alarm state
OFF
ON
Page 79