User manual HANNA INSTRUMENTS HI 981402C

[. . . ] · Safe: operated with 12 Vdc power to prevent the risk of electric shock in combination with water. This instrument is the ideal device to control the CO2 level and flow in your aquarium as it is done by pH control. When the measured pH value exceeds the (user selectable) setpoint, the red alarm LED starts blinking and the instrument provides 12Vdc on the plug (#8 on the functional description figure) to activate the valve of your CO2 dosing system. The dosing of CO2 stops automatically when the desired pH value is reached. [. . . ] · Slide the protective sheath down. Connect the pH electrode to the BNC connector and then slide the protective sheath back up. To ensure maximum waterproof protection, make sure the connector is completely covered. · Do not be alarmed if white crystals appear around the electrode protective cap. This is normal with pH electrodes and they dissolve when rinsed with water. · If the electrode is dry, soak the tip in a storage (HI 70300) or pH 7 (HI 7007) solution for 1 hour to reactivate it. · To minimize clogging and provide longer life for the pH electrode, it is recommended to clean it monthly. Immerse the tip of the electrode in HI 7061 cleaning solution for one hour and then rinse it with tap water. · When not in use, rinse the electrode with water and store it with a few drops of HI 70300 storage solution in the protective cap. Always replace the protective cap after use. NEVER USE DISTILLED OR DEIONIZED WATER FOR STORAGE PURPOSES. 1. 12. Hanna Instruments reserves the right to modify the design, construction and appearance of its products without advance notice. Molded eye Alarm LED pH 4 calibration trimmer Power supply connector 12 Vdc power adapter HI 1230B/2C pH electrode with 2 m (6. 6') cable HI 1283 matching pin with 2 m (6. 6') cable Plug (DIN43650-B) for 12 Vdc magnetvalve power feeding, 1 m (3. 3') cable Protective sheath BNC connector pH 7 calibration trimmer Liquid Crystal Display TAKING MEASUREMENTS · Turn the meter on by connecting the supplied 12 Vdc power adapter to the meter and to the mains. · Remove the protective cap from the pH electrode and immerse the tip (approx. 4 cm/1½") in the sample, together with the matching pin. · The LCD will show the pH value. Allow the reading to stabilize and the instrument will start continuous monitoring. Note: To prevent damages to the electrode, remove the pH electrode from the sample before turning the meter off. CALIBRATION For For the greatest accuracy, it is recommended to calibrate the instrument at least once a month. Calibration should also be performed after replacing the pH electrode. · Pour small quantities of pH 7. 0 (HI 7007) and pH 4. 0 (HI 7004) solutions into two clean beakers. For accurate calibration use two beakers for each buffer solution, the first one for rinsing the electrode tip and the second one for calibration. [. . . ] · Reattach the back making sure that the gasket is in place before tightening the 4 screws. · Whenever the pH reading exceeds the selected setpoint value, the red alarm LED blinks and the power contact output is activated for driving an external magnetvalve, and thus triggering the CO2 dosing system. Recommendations for Users Before using this product, make sure that it is entirely suitable for the environment in which it is used. Operation of this instrument in residential areas could cause unacceptable interferences to radio and TV equipment. The glass bulb at the end of the electrode is sensitive to electrostatic discharges. [. . . ]