User manual HANNA INSTRUMENTS HI 96711

[. . . ] Instruction Manual HI 96711 Free & Total Chlorine Fast Tracker Ion Specific Meter w w w. c o m 1 Dear Customer, Thank you for choosing a Hanna Instruments product. This manual will provide you with the necessary information for correct use of the meter. Please read this instruction manual carefully before using the instrument. [. . . ] "No Light": the instrument cannot adjust the light level. Please check that the sample does not contain any debris. b) on sample reading: There is too much light for the sample measurement. Please check if the right sample cuvet is inserted. "Inverted": the sample and the zero cuvet are inverted. "Zero": a zero reading was not taken. Follow the instruction in the measurement procedure for zeroing the instrument. The sample absorbs less light than the zero reference. Check the procedure and make sure you use the same cuvet for reference (zero) and measurement. A flashing value of the maximum concentration indicates an over range condition. The concentration of the sample is beyond the programmed range: dilute the sample and measure again. 13 GENERAL TIPS FOR AN ACCURATE MEASUREMENT The instructions listed below should be carefully followed during testing, to ensure best accuracy. · For filling correctly the cuvet: the liquid in the cuvet forms a convexity on the top; the bottom of this convexity must be at the same level of the 10 mL mark. · Proper use of the powder reagent packet: (a) use scissors to open the powder packet; (b) push the edges of the packet to form a spout; (c) pour out the content of the packet. · It is important that the sample does not contain any debris. · Each time the cuvet is used, the cap must be tightened to the same degree. · Whenever the cuvet is placed into the measurement cell, it must be dry outside, and completely free of fingerprints, oil or dirt. Wipe it thoroughly with the supplied tissue (HI 731318) or a lint-free cloth prior to insertion. · Shaking the cuvet can generate bubbles in the sample, causing higher readings. To obtain accurate measurements, remove such bubbles by swirling or by gently tapping the vial. · Do not let the reacted sample stand too long after reagent is added, or accuracy will be lost. · It is possible to take multiple readings in a row, but it is recommended to take a new zero reading for each sample and to use the same cuvet for zeroing and measurement. · After the reading it is important to discard immediately the sample, otherwise the glass might become permanently stained. [. . . ] Press the ON/OFF key to turn off the meter. Unscrew the 2 screws from the battery cover and take it away. Take out the batteries and insert 4 fresh 1. 5V batteries, while paying attention to the correct polarity. Replace the cover and screw the 2 screws on again. Note:If batteries are removed from the instrument for more than 30 seconds, the date and time are lost and need to be set again. [. . . ]