Pointek Cls 200 Analog Model - Siemens Pointek CLS 200 Instruction Manual

Application: Pointek CLS 200 analog
model
Level Detection
Note:
• For a more detailed explanation, please see
• For more detailed instructions on setting the dip switches and potentiometers,
Operation: Pointek CLS 200 analog 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 P1. 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 antenna tip, or when the probe is covered.
Alarm Signalling
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 20.)
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
Page I–12 Pointek CLS 200 (analog) – INSTRUCTION MANUAL
Red LED
On
Off
Failsafe High
Operating Principles
from page 19 onwards.
Solid-state switch
Closed
Open
Dry Run Protection =
Failsafe Low
normal state
alarm state
on page 94.
Alarm state
OFF
ON
7ML19985AR02