User manual HANNA INSTRUMENTS HI 84431

[. . . ] Instruction Manual TOTAL ALKALINITY MINITITRATOR & pH METER for Water Analysis HI 84431 w w w. c o m 1 Dear Customer, Thank you for choosing a Hanna product. This manual will provide you with the necessary information for the correct use of the instrument. Please read it carefully before using the meter. [. . . ] Note: Purge the peristaltic pump until drops of reagent appears on the dosing tip by pressing the PURGE key from the titrator main screen. To remove the tube of the peristaltic pump follow next steps: Caution: Purge line with water to remove titrant solution from tube. · Detach the tubes system from the reagent bottle. · Grasp one fixing ring of the peristaltic pump tube. · Pull the tube until the fixing rings are taken out from their location. · Remove the other side of the tube. PURGE Purging should be performed: · whenever the tube of the peristaltic pump is replaced; · whenever the titrant is changed or a new bottle is used; · before starting a pump calibration; · before starting a lot of titrations. In order to start purging press the Purge key from the titrator main screen. The purging stops automatically after 5 minutes. To access the Purge key follow the next steps. · From the instrument main screen (pH meter screen) press "Titrator" function key. The instrument will display the next screen if any of the following conditions exist: - the meter hasn't been calibrated in 8. 30 pH buffer - the pH calibration has expired 24 - a pump calibration hasn't been performed or more than 3 days have passed since the last pump calibration. · Press CAL to access the titration calibration menu where electrode and pump calibration may be accessed. · Press HELP to view the contextual help. · Press Continue or ESC to skip the message and enter Titrator main screen. · Press Purge to begin a purge cycle. The purging stops automatically after 5 minutes. To stop purging at any time and return to the main screen press ESC or Stop. During a purge, the remaining time until the purge process will be completed is shown on the lower right side of the display. Press Pause to interrupt the purge process. Press Pause or Stop (by pressing the corresponding function key in the purge screen) · after the first drops of fresh titrant appear at the dosing tip · in case of error conditions (empty titrant, bottle, tubes or dosing tip disconected, pump error) · if you want to resume at a later time If Pause is pressed the next screen is displayed: Press Resume to continue purging. 25 After the 5 minutes purging interval has elapsed the "Completed" message is displayed. Another purge period can be initiated by pressing Restart or press ESC to return to main titrator screen. PUMP CALIBRATION PROCEDURE SETUP alkalinity type and purge unit with titrant before performing the pump calibration. · Select the corresponding range according to the table below. U NI T m g/L m eq/L Low Range (50 m L sam ple) 10. 0 to 500. 0 0. 2 to 10. 0 High Range (50 m L sam ple) 400 to 4000 8 to 80 The pump calibration must be performed each time the alkalinity type, pump tube, titrant bottle or the pH electrode is changed. It is recommended the pump calibration be performed before each set of titrations. Verify: The electrode has been calibrated in 8. 30 pH buffer. · Sample prepar. ation: Add a precisely measured amount of HI 84431-55 Pump Calibration Solution to a clean beaker as indicated below: Low Range (Strong LR, Total LR) - 2 ml High Range (Strong HR, Total HR) -20 ml Fill the beaker up to the 50 mL mark with the distilled or deionized water. [. . . ] Replace the solution in the protective cap with a few drops of HI 70300 or HI 80300 Storage Solution. Follow the Preparation Procedure section before taking measurements. Note: NEVER STORE THE pH ELECTRODE IN DISTILLED OR DEIONIZED WATER. PERIODIC MAINTENANCE Inspect the electrodes and the cables. The cable used for connection to the instrument must be intact. [. . . ]