SICK CQF16, Operating Instructions Manual

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Figure 34: Function diagram
7 Calibration
The sensor can typically be used on plastic tank walls of about 0.5 - 6 mm and glass
walls of about 0.5 - 4 mm without calibration.
If the factory settings (full state taught in at a 2-mm distance to metallic destination)
are not sufficient, the sensor can be taught in using cables.
Calibration in full state
For most applications, calibration with a full tank or pipe is sufficient.
For applications with various types of fluids or large temperature ranges, it can be
beneficial to teach in the sensor with half the sensor surface covered.
Calibration in empty state
For most applications, calibration with an empty tank or pipe is sufficient.
For applications in which deposits, foam residues or moisture are expected, calibration
can be performed with existing residues.
Calibration modes
Table 8: Teach-in modes
Teach-in mode Teach-in process Teach-in time LED display Result
Full state ET: Connect pin 2
or white wire to
L+ > 2 s ... < 7 s Green LED flash‐
ing (1 Hz), yellow
LED is off Yellow LED
flashes 3 times
(at 1 Hz)
Empty state > 7 s ... < 12 s Green LED flash‐
ing (1 Hz), yellow
LED is on Yellow LED
flashes 3 times
(at 1 Hz)
Cancel calibra‐
tion > 14 s The switching set
point remains
unchanged.
Green LED off,
yellow LED flash‐
ing (4 Hz)
8 Troubleshooting
The Troubleshooting table indicates measures to be taken if the sensor stops working.
LED/fault pattern Cause Measures
Green LED not flashing, yellow
LED flashing (4 Hz, min 1 s) Output short-circuit or input
voltage is under 10 V Test output wiring or voltage
supply
7
CALIBRATION
20 O P E R A T I N G I N S T R U C T I O N S | CQF16 8022710.1F6T/2022-03-16 | SICK
Subject to change without notice
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