15
6.2.6. Due calibration
Pre-set calibration intervals (begin from the date of last calibration) to remind
due calibration in a preset period in parameter setting P2.6 (clause 7.4). During
due calibration, Er5 icon appears on LCD (see Diagram – 12). The meter
cannot continue operation and Er5 icon disappears until the calibration is done,
or when select “No” in parameter setting P2.6.
6.2.7. Check the calibration date
Check the last calibration date to see whether a new calibration is needed per parameter P2.7. (clause 7.4.)
6.3. Conductivity Calibration (take calibration with 1413μS/cm as an example)
6.3.1. Rinse pH electrode in pure water, allow it to dry, wash with a little of standard solution and submerge it
in standard solution. Stir the solution briefly and allow it to stay in the solution until a stable reading is
reached.
6.3.2. Press key to enter into the calibration mode.
The meter’s display will show blinking CAL at the top right, and
scanning and locking process of calibration solution at the bottom right.
When the meter locks 1413 μS, stable icon displays on LCD.
Press key to finish calibration, meter goes into measurement mode.
LCD shows icon at the bottom left. See Diagram – 13
6.3.3. For multi-point calibration, please repeat clause 6.3.1-6.3.3 until
all the calibrations are done. The meter can repeat calibration in the
same calibration solution to ensure better accuracy and repeatability
of the reading.
6.3.4. Notes
(a) Er 2 appears if press key before the value is locked.
See chart – 12.
(b) If return from calibration mode, press to exit.
6.4. Relations among TDS, salinity and conductivity
6.4.1. TDS and conductivity is linear related. The conversion factor is 0.40-1.00.
Adjust per parameter P2.5. The factory default setting is 0.71 to see clause 7.4.
Salinity and conductivity are interrelated, the factor is 0.5, The meter can only
be calibrated in conductivity mode and not TDS mode. After calibration of
conductivity, the meter can switch from conductivity to TDS or salinity.
6.4.2. Adjust TDS conversion factor per parameter P2.5 according to the data collected during testing. See
chart – 11: commonly used TDS conversion factors.
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