11
10
TEMPERATURE CALIBRATION
(for technical personnel only)
The temperature calibration is a 2 point procedure, at 0 and 50°C.
• Immerse the probe in a 0°C temperature bath.
• Press ALT+CALT to enter temperature calibration mode.
• The lower LCD displays "0.0 °C"; "BUF" and "CAL" tags appear.
• When the reading is stable, "CON" symbol starts blinking.
• Press ALT+CFM to confirm. The lower LCD displays "50.0°C".
• Immerse the probe in a 50°C temperature bath.
• When the reading is stable, "CON" symbol starts blinking.
• Press ALT+CFM to confirm and return to normal operation.
TEMPERATURE ADJUSTMENT
The temperature reading can be manually fine-tuned by following this
procedure:
Press ALT+CALT to enter the temperature
calibration mode.
Press CAL to enter the temperature adjust-
ment mode. The upper and lower LCD will
display the current temperature reading.
Adjust the temperature reading on
the upper LCD using the arrow keys.
The maximum adjustment is ±1°C
around current reading.
Press ALT+CFM to confirm. The meter re-
turns to measurement mode and displays
the new temperature.
Note:
Press ALT+CALT to escape without any changes.
Note:
It is possible to enter the temperature adjustment mode
only if
the probe is connected
.
NaCl CALIBRATION
NaCl calibration is a single point procedure at 100.0% NaCl.
Use the
HI 7037
calibration solution (sea water solution) as 100%
NaCl standard.
To enter NaCl calibration select the NaCl range and
press the CAL key.
Rinse the probe with some of the calibration solu-
tion or deionized water, then immerse it in
HI 7037
solution. The sleeve holes must be completely sub-
merged. Tap the probe repeatedly to remove any
air bubbles that may be trapped inside the sleeve.
The "BUF" and "CAL" indications are dis-
played. The upper LCD shows the uncalibrated
NaCl reading in percentage. The lower LCD
shows "100".
When the " " symbol stops blinking, the
reading is stable. The "CON" indication starts
blinking on the LCD asking for confirmation.
Press ALT + CFM to confirm the calibration.
If everything is satisfactory, the meter displays the "Stor Good"
message and returns to measurement mode.
Note:
If the uncalibrated reading is too far from the expected value,
the calibration is not recognized. The "CON" indication does not
appear; the " " and "BUF" symbols blink to warn the user.
Note:
The meter uses 1.90%/°C compensation factor during calibra-
tion. If the setup item "tc" has been set to a different value,
when exiting calibration mode the value displayed on the upper
LCD could be different from the nominal calibration value.
III
Use plastic beakers to minimize any EMC interference.
IV
The meter uses 1.90%/°C compensation factor during calibra-
tion. If the setup item "tc" has been set to a different value,
when exiting the calibration mode the value displayed on the
upper LCD could be different from the solution nominal value.
V
It is possible to set the cell constant value directly without
following the calibration procedure. Enter the setup mode and
select "CEL" (see "Setup" section for details).
