7 Operation
7.1 Calibrate sensor
The sensor was tested and cali‐
brated before leaving the factory.
For this reason, you can use the
sensor right away. Under normal
conditions, it is recommended to
carry out calibration at least once
every three months.
The alarm relay switches over to
alarm state if the sensor is in
[CAL] or [CONFIG] mode. If no
entry is made in [CAL] mode
within a period of 15 minutes, the
sensor automatically toggles back
over to [AUTO] mode.
7.1.1 Standard solutions for cali‐
bration
If you operate the sensor across
its entire measurement range
from 0.02 NTU to 1000 NTU, then
you must perform calibration with
all three standard solutions (0.02
NTU, 10.0 NTU and 1000 NTU). If
the sensor is only operated in
measurement ranges under 10
NTU, then you may perform a
simplified calibration with standard
solutions 0.02 NTU and 10.0
NTU.
Operation
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