User manual HANNA INSTRUMENTS HI 9813-5

[. . . ] If the repair is not covered by the warranty, you will be notified of the charges incurred. If the instrument is to be returned to Hanna Instruments, first obtain a Returned Goods Authorization number from the Technical Service department and then send it with shipping costs prepaid. When shipping any instrument, make sure it is properly packed for complete protection. TABLE OF CONTENTS WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 PRELIMINARY EXAMINATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] TAKING pH MEASUREMENTS If the probe has been left dry, soak the tip in HI 70300 storage solution for 30 minutes to reactivate it. · To take a pH measurement simply submerge the tip (4cm/1½") of the probe into the sample to be tested. · Stir briefly and wait a couple of minutes for the reading to adjust and stabilize. · If measurements are taken in different samples successively, it is recommended to rinse (clean) the probe thoroughly to eliminate cross-contamination. After cleaning, it is recommended to rinse the probe with some of the next sample to be measured. TAKING EC/TDS MEASUREMENTS · Immerse the tip of the probe (4cm/1½") into the sample to be tested. If possible, use plastic beakers or containers to minimize any EMC interference. · Tap the probe lightly on the bottom of the beaker to remove any air bubbles which may be trapped inside the tip. 7 · Select the appropriate measurement range (EC or TDS). · Wait for a couple of minutes for the temperature sensor to reach thermal equilibrium. The display then shows the measurement automatically compensated for temperature with the appropriate following indication: "mS" tag indicates the meter is in EC mode, while "ppm" tag indicates the meter is in TDS mode. TAKING TEMPERATURE MEASUREMENTS · Submerge the tip (4cm/1½") of the probe into the sample to be tested. · Stir briefly and wait a couple of minutes for the reading to adjust and stabilize. The display shows the temperature value. Notes: · If the display shows only a "1" on the far left hand side, the reading is out of range. · It is recommended to clean often the probe with HI 700661 Cleaning Solution. · After measurements have been completed, the instrument should be switched off, and the probe cleaned and covered with the protective cap. 8 p H CALIBRATION For greatest accuracy, frequent calibration of the instrument is recommended. The instrument should be recalibrated for pH: a) Whenever the electrode is replaced. e) Whenever the CAL-CHECK test fails (HI 9813-6 only). PREPARATION Pour small quantities of pH 7. 01 (HI 7007) or pH 4. 01 (HI 7004) or pH 10. 01 (HI 7010) solution into a clean beaker. To obtain accurate readings, use pH 7. 01 (HI 7007) if you are going to measure neutral or close to neutral samples, pH 4. 01 (HI 7004) if you are going to measure acidic samples or pH 10. 01 (HI 7010) for alkaline measurements. If you need to calibrate to NBS standards, use pH 6. 86 (HI 7006) instead of pH 7. 01 and pH 9. 18 (HI 7009) instead of pH 10. 01. PROCEDURE · Connect the probe and switch the meter on, then press the pH key to display pH measurement. · Remove the protective cap from the probe, rinse and immerse it in the buffer and stir gently. Wait a couple of minutes for the reading to stabilize. [. . . ] Operation of these instruments in residential areas could cause unacceptable interferences to radio and TV equipment, requiring the operator to follow all necessary steps to correct interferences. The glass bulb at the end of the electrode is sensitive to electrostatic discharges. Avoid touching this glass bulb at all times. During operation, ESD wrist straps should be worn to avoid possible damage to the electrode by electrostatic discharges. [. . . ]