Hanna Instruments HI 98240 Instruction Manual

Contents

Hanna Instruments HI 98240 Instruction Manual Manual pdf 11 page image

2120TEMPERATURE CALIBRATION PROCEDURE(for technical personnel only)The meter is factory calibrated for temperature. It is recommendedthat the following procedure is performed by authorized technicalpersonnel only.A two point calibration at 0.0, 25.0°C (32.0, 77.0°F) or 0.0, 50.0°C(32.0, 122.0°F) has to be performed in order to store the newcalibration data in memory.1. Immerse the electrode with the built-in temperature sensor in the0°C (32°F) temperature bath.2. Press RANGE until temperature reading is selected.3. Press ALT and CAL to enter temperature calibration mode.4. Enter the password if requested.5. When the reading is stable the "S" symbol starts to blink.6. Press ALT and CFM to confirm. LCD will display 50.0°C (122.0°F)as the following calibration point.7. If 25.0°C (77.0°F) is desired as second point, press ‚ to display25.0°C (77.0°F).8. Immerse the probe in the second temperature bath.9. When the reading is stable, the "S" symbol starts to blink.10. Press ALT and CFM to confirm and return to temperature readingmode.mV CALIBRATION PROCEDURE(HI 98240 ONLY)A 4 point calibration must be performed. The first two calibrationpoints are 0 and 350 mV for low range calibration; the other twopoints are 0 and 350 or 1900 mV for high range calibration.1. Connect a mV simulator (HI 8427 or HI 931001 with the properconnection cable) to the meter and set it to 0 mV.2. Press ALT and CAL when LCD is displaying mV.3. User is prompted to enter password if it has been set to a valuedifferent from 0000, otherwise skip to step 6.4. Enter the password with the arrow keys.5. Press ALT and CFM to confirm the password or ALT and CAL toreturn to normal operational mode.6. If password is correct or not set, themeter will display "0.0 mV" on the upperLCD and "b1" on the lower; if wrong, itwill return to normal operational modewithout any message.7. When the "S" symbol blinks in the lowerLCD, the reading is stable and calibra-tion can be confirmed.8. Press ALT and CFM to confirm the first value.9. The meter will display "350.0 mV" in theupper LCD and "b2" on the lower one.10. Set the simulator to +350 mV.11. When the "S" symbol blinks in the lowerLCD, the reading is stable. Press ALT andCFM to confirm the second value.12. The meter will display "0 mV" in theupper LCD and "b3" on the lower one.13. Set the simulator to 0 mV.14. When the "S" symbol blinks in the lowerLCD, the reading is stable. Press ALT andCFM to confirm the third value.15. The meter will display "350 mV" in theupper LCD and "b4" on the lower one.Pressing the "· " key, 1900 mV will beselected as calibration point.Note: +1900 mV is suggested as the last calibration point toobtain the best accuracy throughout the entire mV range.16. Set the simulator to +1900 mV.17. When the "S" symbol blinks in the lowerLCD, the reading is stable. Press ALTand CFM to confirm the fourth value.18. Calibration is now complete and the instrument returns to normaloperational mode.Note: "Err" message notifies the user if the selected value is wrong.