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11. Compensate for altitude in metric units when operating in DO measurement mode.
The default value is 0 meters (sea level). The level is adjustable from 0 to 8,900 meters.
Once the salt compensation level has been set and stored, the lower portion of the
display will show the term "High-". Press the M or L button repeatedly until the value
above "High-" reflects your altitude in meters. Press the REC/ENTER button to store the
setting.
12. Compensate for altitude in English units when operating in DO measurement mode.
The default value is 0 ft (sea level). The level is adjustable from 0 to 29,200 ft. Once the
altitude compensation level in meters has been set and stored, the lower portion of the
display will show the term "Highf". Press the M or L button repeatedly until the value
above "Highf" reflects your altitude in feet. Press the REC/ENTER button to store the
setting.
13. Compensate the conductivity/TDS/salt probe for temperature. The default value is
2% per degree C. The value is adjustable from 0 to 5% per degree C. Once the altitude
compensation level in feet has been set and stored, the lower portion of the display
will show the term "PEr C". Press the M or L button repeatedly until the value above
"PEr C" matches the desired temperature compensation level. Press the REC/ENTER
button to store the setting.
14. Choose conductivity (uS or mS) or TDS (ppm) units. Once the temperature
compensation level in conductivity measurement mode has been set and stored, the
lower portion of the display will show the term "tDs". Press the M or L button until
either the term "Cd" or "tdS" appears above it. Then press the REC/ENTER button to
store the setting as the default.
15. Set the compensation temperature for the pH electrode when the meter is operating
in pH measurement mode without an ATC probe. The default value is 77ºF (25ºC).
The compensation temperature can be set anywhere between 32º and 212ºF
(0º and 100ºC). Once the units of conductivity measurements have been set and stored,
the lower portion of the display will show the term "t-Set". Press the M or L button
repeatedly until the value above "t-Set" matches the desired compensation
temperature. Press the REC/ENTER button to store the setting.
The display will then either return to the first of the 13 steps in the setup sequence—
choosing whether or not to format the SD memory card—or show the term "ESC". If "ESC"
appears, press either the HOLD/ESC button or the LOGGER SET button to exit the setup
procedure and enter normal operating mode.
CALIBRATING A pH ELECTRODE
The optional pH electrode you are using must be calibrated before making pH measure-
ments with it for the first time. The electrode also should be calibrated whenever you wish
to maximize the accuracy of measurements. Calibration is necessary because not every
pH electrode is an "ideal" electrode that generates 0 mV at pH 7 and 177.4 mV at pH 4.
To calibrate a pH electrode, perform the following procedure while referring to Figure 2:
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