Hanna Instruments HI 9812-0 Instruction Manual

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Hanna Instruments HI 9812-0 Instruction Manual Manual pdf 4 page image

76• Select the appropriate measurement range (EC or TDS).• Wait a couple of minutes for the temperature sensor to reachthermal equilibrium. The display will then show the measurementautomatically temperature compensated for temperature with theappropriate indication among the following:"μS" symbol indicates the meter isin EC mode;no symbol indicates the meter is inTDS mode.TAKING TEMPERATURE MEASUREMENTS(for HI 9812-5 only)• Submerge the tip (4cm/1½") of theprobe into the sample to be tested.• Select the °C mode.• Stir briefly and wait a couple ofminutes for the reading to adjustand stabilize. The display shows thetemperature value.Note: If the display shows only a "1"on the far left hand side, thereading is out of range.Note: It is recommended to clean often the probe with HI 700661Cleaning Solution.Note: After measurements have been completed, the instrumentshould be switched off, and the probe cleaned and coveredwith the protective cap.OPERATIONAL GUIDEINITIAL PREPARATIONEach meter is supplied complete with a 9V battery. Remove thebattery compartment cover on the back of the meter and install thebattery while paying attention to its polarity.Connect the probe to the DIN socket on the top of the meter byaligning the pins with the socket and pushing in the plug.Always remove the electrode protective cap before taking any mea-surements and make sure the meter has been calibrated beforetaking any measurements.Turn the meter on by pressing the ON/OFF key.TAKING pH MEASUREMENTSIf the probe has been left dry, soak the tip in HI 70300 storagesolution for a few minutes to reactivate it.• To take a pH measurement simply submerge thetip (4cm/1½") of the probe into the sample tobe tested.• Select the pH mode.• Stir briefly and wait a couple ofminutes for the reading to adjustand stabilize. The display showsthe pH value.• If measurements are taken in different samples successively, it isrecommended to rinse (clean) the probe thoroughly to eliminatecross-contamination. After cleaning, it is recommended to rinsethe probe with some of the next sample to be measured.TAKING EC/TDS MEASUREMENTS• Immerse the tip of the probe (4cm/1½") into thesample to be tested. If possible, use plastic beakersor containers to minimize any EMC interference.• Tap the probe lightly on the bottom of thebeaker to remove any air bubbles which may betrapped inside the tip.