Delta OHM HD2205.2, Руководство пользователя

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The solution temperature for the calibration must be between 15°C and 35°C: If the solution
is under 15°C, or over 35°C, the instrument rejects the calibration and displays “NON
ADMISSIBLE CAL”.
1. Turn the instrument on with the ON/OFF key.
2. If the probe is direct, without SICRAM, set the cell constant nominal value in the menu for the
probe being calibrated (point 5.3 on page 20).
3. Set the
α
T
temperature coefficient in the menu (point 5 on page 20): For Delta OHM calibration
solutions, enter 2.00%/°C.
4. Set the reference temperature in the menu (20°C or 25°C) (point 5.1 on page 20):
5. Dip the conductivity meter cell in the calibration solution until the electrodes are covered with
liquid.
6. Stir the probe lightly to remove any possible air inside the measurement cell.
7. If the conductivity probe is not fitted with a temperature sensor, connect a temperature probe to
the connector
5
, and immerse it together with the conductivity probe. Alternatively, press
°C/°F, set the standard solution temperature value manually by using the and arrows
(manual setting of temperature). Confirm by pressing ENTER.
8. Press CAL , followed by “ F2 = cond. ”
9. The cell constant Kcell is set to the nominal value input in the menu if the probe is direct
without SICRAM, or to the value read in the memory of the SICRAM type probe
.
10. Among the standard buffers, the instrument automatically detects the closest to the conductivity
value being read, and shows the nominal value at 25°C on the right with a blinking arrow.
The displays shows on the left the conductivity measurement value based on the cell constant
specified before. The recognized standard calibration solution value is displayed in the center.
Both values refer to the solution actual temperature, that is,
not compensated . Also the current
cell constant Kcell, the solution temperature and the 4 measurement ranges (Range = 0 1 2 3)
are reported.
If the measurement was TDS, resistivity or salinity, by pressing CAL the instrument goes
automatically into conductivity calibration mode.
11. The detected buffer value, shown in the center, can be modified using the arrows and .
12. To proceed with the calibration press F2 = CAL . The cell constant actual value is displayed.
The ; symbol is displayed over the number identifying the calibrated range. The instrument is
still in calibration mode: By pressing F2 = CAL again, it is possible to repeat the current cali-
bration point to obtain a finer calibration.