Hanna Instruments HI 96765 - Manual (Page 10)

10
The instructions listed below should be carefully followed during testing to ensure best accuracy.
• Color or suspended matter in large amounts may cause
interference, therefore these should be removed by
treatement with active carbon and by prior filtration.
• For a correct filling of the tube: the liquid in the tube
forms a concavity on the top; the bottom of this concavity
must be at the same level of the 1.5 mL mark.
• It is important that the sample does not contain any debris. This would corrupt the reading.
GENERAL TIPS FOR AN ACCURATE MEASUREMENT
• Whenever the tube is placed into the measurement cell, it must be dry outside, and
completely free of fingerprints, oil or dirt. Wipe it thoroughly with HI 731318 or a lint-free
cloth prior to insertion.
• It is possible to take multiple readings in a row, but it is recommended to make a new
calibration for each sample.
STARTUP
Prepare the instrument for measurement as follows:
• Unpack the instrument by removing the dust protection sleeve from the instrument tube holder.
• Place the battery in the instrument as described in the “BATTERY REPLACEMENT” chapter.
• Place the instrument on a flat table.
• Do not place the instrument under direct sun light.