User manual HANNA INSTRUMENTS HI 8064

[. . . ] 7 Relative Humidity Calibration Table . . . . . . . . . . . . 8 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Hanna Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. [. . . ] Remove the three screws on the rear cover of the instrument and replace the battery with a new one, while paying attention to the correct polarity. 4 CALIBRATION Relative Humidity Calibration The HI 8064 thermohygrometer is factory calibrated, but it is recommended to periodically control the calibration status of the meter. Use the HI 7601 calibration kit composed of a container with two separate chambers, each one equipped with a threaded plug and three envelops containing the necessary salts. 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. [. . . ] This warranty is limited to repair or replacement free of charge. If service is required, contact the dealer from whom you purchased the instrument. If under warranty, report the model number, date of purchase, serial number and the nature of the failure. If the repair is not covered by the warranty, you will be notified of the charge for repair or replacement. [. . . ]