11 Maintenance
n User qualification: trained user, see
Ä Chapter 3.4 ‘Users' qualifications’
on page 14
The controller is maintenance- free.
11.1 Error messages
n User qualification for diagnosis:
trained user, see
Ä Chapter 3.4
‘Users' qualifications’ on page 14
.
Further qualifications depend on the
type and scope of possible trouble‐
shooting measures to be carried out.
Measuring technology-specific
errors: [INPUT↑]
The electrical sensor signal directly
on the conductivity sensor input is too
high. The conductivity calculated is
less than that actual conductivity reg‐
istered.
The error occurs from a value of:
–
200mS/cm with sensors with cell
constant 1.0
–
20mS/cm with sensors with cell
constant 0.1
–
2mS/cm with sensors with cell
constant 0.01
The specified limit can also be higher
depending on the sensor.
Measured variable-specific
errors: [TDS ↑]
>2000: If the calculated TDS value is
over 2000.
Measured variable-specific
errors: [SAL ↑]
>70: If the calculated SAL value is
over 70.
Error detection following device
start
The majority of errors are only dis‐
played with a 10-second delay fol‐
lowing the start-up of the device.
Maintenance
89
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