User manual HANNA INSTRUMENTS PH21

[. . . ] Instruction Manual pH20 · pH21 Basic pH meters www. hannainst. com Dear Customer, Thank you for choosing a Hanna Instruments Product. Please read this instruction manual carefully before using the instrument. This manual will provide you with all the necessary information for the correct use of the instrument, as well as a precise idea of its versatility in a wide range of applications. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com These instruments are in compliance with the directives. PRELIMINARY EXAMINATION Remove the instrument from the packing material and examine it to make sure that no damage has occurred during shipping. [. . . ] Note: With refillable electrodes, to obtain a faster response unscrew the refill hole cap during measurements. · Shake briefly and wait a few seconds for the reading to stabilize, i. e. when the hourglass symbol stops blinking. The LCD will show the ORP (mV) value. 7 · After measurements, turn the meter off by pressing the ON/OFF key, disconnect the power adapter from the mains and the electrode from the instrument. Note: To perform correct ORP measurements, the surface of the ORP electrode must be clean and smooth. Note: When not in use, the tip of the electrode should be kept moist and safe from any mechanical stress which might cause damage to the glass/platinum junction. pH CALIBRATION For better accuracy the instruments should be calibrated frequently, and however: 1. · Turn the instrument on after connecting the pH electrode and the temperature probe. · Immerse the temperature probe together with the electrode into pH 7. 01 buffer solution or manually set the temperature (see the note here below). Note: The pH electrode should be submerged approximately 4 cm (1½") into the solution and the temperature probe should be located as close as possible to the electrode. Note: If the temperature probe is not used, measure the buffer value with a thermometer, enter the °C mode by pressing the RANGE key and adjust the displayed value by using the arrow keys. · Press the RANGE key to display pH readings. · Press the CAL key to enter the calibration mode: the display flashes "pH 7. 01" and the hourglass symbol lights up. TAKING TEMPERATURE MEASUREMENTS · The meter is factory calibrated for temperature range. Please contact the nearest Hanna Service Center for recalibration, if needed. · Connect the HI 7662 temperature probe (optional) to the proper connector on the rear panel (see page 4). · Connect the 12VDC power adapter to the instrument (see page 4) and then to the mains. · Press the ON/OFF key to turn the meter on. · Press the RANGE key to select the temperature (°C) mode. · Immerse the probe in the sample to be tested. · Shake briefly and wait a few seconds for the reading to stabilize, i. e. when the hourglass symbol stops blinking. The LCD will show the temperature (°C) value. · After measurements, turn the meter off by pressing the ON/OFF key, disconnect the power adapter from the mains and the probe from the instrument. HOLD FUNCTION · To freeze a reading on display, from measurement mode press and hold the HOLD key. [. . . ] HI 1083B Glass body, micro, Viscolene, non-refillable, combination. HI 1110B Glass body, single junction, gel-filled, combination. HI 1131B Glass body, single junction, refillable, combination. HI 1230B Plastic body, double junction, gel-filled, combination. [. . . ]