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Manual abstract: user guide HANNA INSTRUMENTS HI 207
Detailed instructions for use are in the User's Guide.
[. . . ] 3- HOLD/SET key, to freeze the display, to select the temperature unit or the calibration buffer set, or to reset to the default calibration. 4- Stirrer status LED indicator (HI 208 only). 5- STIR ON/OFF key (HI 208 only), to start/ stop the stirrer. Rear Panel
7 8 9
Range (*) Resolution Accuracy
-2. 00 to 16. 00 pH -5. 0 to 105. 0 °C / 23. 0 to 221. 0 °F 0. 01 pH 0. 1 °C / 0. 1 °F ±0. 02 pH ±0. 5 °C up to 60 °C; ±1 °C outside ±1 °F up to 140 °F; ±2 °F outside ±0. 02 pH ±0. 2 °C or ±0. 4 °F Automatic
(@20°C/68°F)
Typical EMC Deviation Temperature Compensation
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WARRANTY
All Hanna Instruments meters are warranted for two years against defects in workmanship and materials when used for their intended purpose and maintained according to instructions. [. . . ] The meter will display all segments as long as the key is pressed. Note: If using a battery and its percentage is under 15%, the stirrer will not work. To freeze the display While in measurement mode, press the HOLD/ SET key. The "HOLD" message will appear on the secondary display and the reading will be frozen on the LCD (e. g. Press any key to return to normal measurement mode. To turn the meter OFF While in normal measurement mode, press the ON/OFF/MODE key. The "OFF" message will appear on the secondary display. Note: The instrument is provided with an acoustic signal feature, which is heard every time a key is pressed. Note: When the instrument detects the absence of the probe, the "ATC" tag turns off and the secondary display shows a default temperature value of 25 °C (77 °F) blinking. When the probe is connected, the instrument automatically returns to the Automatic Temperature Compensation mode, the "ATC" tag turns on, and the measured temperature is shown on the secondary display.
pH MEASUREMENT & CALIBRATION
· Make sure the instrument has been calibrated before use. · If the probe is dry, soak it in HI 70300 storage solution for one hour to reactivate it. · Make sure that the stirrer LED is off or press the STIR ON/OFF key to stop the stirrer (HI 208 only). · Place the beaker with the solution to be tested into the beaker holder and attach the electrode holder. · Insert the probe in the electrode holder and use the supplied rubber O-ring for probe in order to immerse the probe tip approximately 4 cm (1½") into the sample to be measured. · Press STIR ON/OFF to start the stirrer (HI 208 only) and wait until the stability indicator turns off. While the stirrer is on, the stirrer LED also is on. · The LCD shows the pH value automatically compensated for temperature variations and the temperature of the solution. · If measurements are taken in different samples successively, rinse the probe tip thoroughly to eliminate cross-contamination. After cleaning, rinse the probe tip with some of the sample to be measured. pH calibration For better accuracy, frequent calibration of the instrument is recommended. In addition, the instrument must be recalibrated whenever: a) The pH electrode is replaced. · From normal mode press and hold the ON/OFF/ MODE key until "OFF" message on the secondary display is replaced by "CAL". [. . . ] · To reset to the default values and clear a previous calibration, press the HOLD/SET key after entering calibration mode and before the first point is accepted. The secondary display shows "CLR" message for 1 second, the instrument resets to the default calibration and the "CAL" tag turns off.
INSTRUMENT SETUP
The SETUP mode allows the selection of the temperature unit and the pH buffer set. To enter SETUP mode, press and hold the ON/ OFF/MODE key until "CAL" message on the secondary display is replaced by "TEMP" and the current temperature unit (e. g. Then: · for °C/°F selection, use the HOLD/SET key. [. . . ]
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