Application; Level Detection; Alarm Signaling - Siemens Pointek CLS200 Operating Instructions Manual

Application

F.1

Level detection

Note
• For a more detailed explanation, please see Operating principles (Page 56).
• For more detailed instructions on setting the dip switches and potentiometers, please see
Pointek CLS200 (Page 36) (for CLS200) or Pointek CLS300 (Page 42) (for CLS300).
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.
F.2

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 Pointek CLS200 (Page 36) (for CLS200) or Pointek CLS300
(Page 42) (for 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.
• high alarm: alarm ON/switch open when level is higher than the set point (probe becomes
covered
• low alarm: alarm ON/switch open when level is below the set point (probe becomes
uncovered)
The setting is selected by turning dip switch 3 on or off.
106
Red LED
On
Off
)
1)
Solid-state switch
Closed
Open
Pointek CLS200/CLS300 standard
Operating Instructions, 05/2021, A5E47827796-AA
F
Alarm state
OFF
ON