User manual HANNA INSTRUMENTS HI 8064

[. . . ] This instrument is in compliance with the directives. TABLE OF CONTENTS Preliminary Examination . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2 PRELIMINARY EXAMINATION Remove the instrument from the packing material and examine it carefully to make sure that no damage has occurred during shipment. Note: Save all packing material until you are sure that the instrument functions correctly. [. . . ] Preparing the calibration solutions · Pour approximately 26 cc of distilled water into a glass container. · Immerse the container in a bath of ice and water, and shake briefly. Then add slowly the contents of an envelope containing LiCl to the container while continuing to shake. When the salt has completely dissolved, add the contents of the second envelope. · Allow the solution to cool, and then pour it into the chamber marked "RH 11. 1%", making sure that no residue remains on the walls of the glass container. Note: When not in use, carefully seal the chamber as the LiCl solution is extremely hygroscopic and tends to capture the air humidity causing the solution to expand slowly until it overflows from the container. · Pour approximately 26 cc of distilled water into the other chamber (marked "RH 75. 4") and add the contents of the envelope containing NaCl, while shaking the container to avoid any lump formation. Note: When not in use, carefully seal the container. 5 Calibration procedure · Bring the calibration kit to a temperature of approximately 20 ºC. · Remove the plug from the chamber containing the LiCl solution and insert the probe. · Remove the adhesive sticker which covers the calibration trimmer access holes. · Wait for the reading to stabilize (this will take a few hours) and then turn the "Low humidity trimmer" (the one nearest to the probe connection cable) until the value of 11. 1% RH will be displayed on the LCD. · Remove the probe and tightly seal the chamber containing the LiCl solution. · Remove the plug from the second chamber and insert the probe. · Wait for the reading to stabilize and then note the displayed value. · By using the Calibration Table (pages 8-9), find the displayed readout value on column "A" and the corresponding RH value of column "B", to which the meter has to be brought by acting on the "High humidity trimmer". · Adjust the "High humidity trimmer" (the one opposed to the connection cable) until the required value is displayed on the LCD. · Finally adjust the "Low humidity trimmer" until the value of 75. 4% RH will be displayed on the LCD. 6 Temperature Calibration The HI 8064 thermohygrometer is factory calibrated and therefore usually it requires no further intervention by the user. If recalibration is desired, proceed as follows: · Remove the adhesive sticker which covers the calibration trimmer access holes. [. . . ] If the instrument is to be returned to Hanna Instruments, obtain a Return Goods Authorization from the Customer Service Department first and then send it with shipment cost prepaid. When shipping any instrument, make sure it is properly packaged for complete protection. To validate your warranty, fill out and return the enclosed warranty card within 14 days from the date of purchase. All rights are reserved. [. . . ]