23
8.4 Checking OTT ecoN reference values
The OTT ecoN has 5 reference measured values, which can be used to check
correct functioning of the device:
Sensor-Quality-Index: –
SQI
Light intensities: –
RefA
(Wavelength 212 nm)
–
RefB
(Wavelength 254 nm)
–
RefC
(Wavelength 360 nm)
–
RefD
(Reference diode)
For detailed information on the reference measured values, see Chapter 6.2.
Recommended checking interval: if implausible measured values occur.
RefD < 13 000?
The light intensity of the xenon flash lamp is too low (ageing process)
➝
Send the OTT ecoN to the OTT Hydromet GmbH repair centre.
RefD > 13 000 and RefA, RefB, RefC < 150?
➝
Take sensor out of water and perform measurement with air
Values identical?
➝
Thoroughly clean sensor, see Chapter 8.1 and measure
with air again
Values identical?
➝
Check zero point, see Chapter 8.2.
Values identical?
➝
Send OTT ecoN to OTT Hydromet GmbH repair centre;
see Chapter 9
In ultra pure water:
RefA, RefB, RefC = RefD ± 5000
➝
OK
In ultra pure water:
RefA, RefB, RefC = RefD ± 5000 and
in measuring medium:
RefA, RefB, RefC < 150
➝
Send OTT ecoN to OTT Hydromet GmbH repair centre; see Chapter 9.
