EF315_r5.1(v12.22) – 03/2023 page 22
If you try to calibrate the gain at a value too far from the limits, the instrument automatically discards the
calibration and generate an error. The display shows the message “Calibration Failed !”. Check that all
the required initial conditions are satisfied. Moreover:
a) Cleanliness of the CLE12 cell (if cleaning is required, then make the cell work for about 8 hours before
proceeding with a new calibration)
b) Status of the electrolyte and membrane of the CAC (or CP) cell; if necessary, substitute them
Refer to the instruction manuals of the cells for more details about cleaning and maintenance
operations.
If you try to calibrate shortly after switching on, the error “Wait for chlorine probe stabilization!”
appears. Wait at least the time set in P18.
Warning! If a calibration is performed with CAC cell not correctly polarized, the unit could complete the
procedure and display the “Cal. Cl
2
in 24h”, which alerts the user about the need of a new calibration
after 24 hours.
This warning message will remain on the display and the unit will work in a “tentative” mode, adjusting
the chlorine with a halved threshold value, until a calibration is performed with a cell signal within the
expected limits.
Temperature Calibration
The electronic calibration of the instrument and the precision class of the Pt100 sensor, ensure a
maximum error of ±0.3°C @ 0°C and ±0.8°C @ 100°C (Pt100 class B, accordingly with IEC 751 std.).
Therefore, no user calibration is required.
Note: Factory calibration is performed with a sensor with 2 m cable. Using a probe with a cable longer
than 2 meters could introduce a greater reading error.
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