Full Product Manual

7
Auto Power Off
Topreservebatterylife,themeterisprogrammedtoturnoffafterapproxi-
mately 10 minutes of inactivity.
pH Calibration Procedure
IfthepHmeterisstoredforanextendedperiodoftime,priortocalibration,
condition your electrode in pH 4 buffer solution or distilled water for a mini-
mum of 1 hour. The electrode is now ready for calibration.
1. Prepare buffer solutions for calibration. It is recommended to start
with calibration buffer pH 7.00 pH, followed by either pH 4.00 or pH
10.00(whicheverisnearesttotheexpectedsamplevalue).Usethe
pH 4.00 and pH 7.00 buffer solutions when measurements are
expectedtobeonthelowersideofthepHscale.UsethepH7.00
andpH10.00buffersolutionswhenmeasurementsareexpectedto
be on the higher side of the pH scale.
Note:TheAutomaticTemperatureCompensation(ATC)isnotactiveduring
the calibration process. For a more accurate calibration, make sure that
calibrationbuffersolutionsareat77°F(25°C).
2. Turn the meter on by pressing the Power button.
3. Place the electrode into the pH 7.00 buffer solution, so that the tip
of the electrode is fully immersed in the buffer solution, and stir at a
moderate, uniform rate.
4. When calibration has stabilized, a pH value will appear at the top of
the display.
5. PressandholdtheCALbuttonuntil"CAL"appearsonthedisplay
and release to enter the calibration mode.
6. "CAL"willnowbegintoblinkindicatingthecalibrationprocess
has begun.
Note:If"Err"isdisplayedafterholdingtheCALbutton,makesureavalid
pH buffer solution is being used, and that the electrode is not dried out.
7. The pH meter will then automatically identify the buffer solution and
the current temperature.
continued...
REED Instruments
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