Photometer
16
6.4. MEASUREMENT RECOMMENDATIONS
• Whenever the vial is placed into the measurement holder, it must be
dry outside and free of fingerprints, oil, or dirt. Wipe it thoroughly with
HI731318
microfiber cleaning cloth or a lint‑free wipe prior to insertion.
• Shaking the vial 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 has been added.
For best accuracy, respect the timings described in each method.
• 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 vial for zeroing and measurement when possible.
• Discard sample immediately after reading has been taken, or the glass might become permanently stained.
• All reaction times reported in this manual are at 25 °C (77 °F). In general, reaction time should be increased
for temperatures lower than 20 °C (68 °F), and decreased for temperatures higher than 25 °C (77 °F).
6.5. BATTERY MANAGEMENT
The meter will perform an auto‑diagnostic test when it is powered on. During this test, the Hanna Instruments
®
logo will appear on the LCD. If the auto‑diagnostic test was successful, the meter is ready for use.
To conserve the battery, the meter turns off automatically after 15 minutes of inactivity.
If a zero reading has been done but not a Read, auto‑off time is increased to 30 minutes.
The battery icon on the LCD indicates the battery status:
Battery is full.
Battery is below 10 %.
Replace the batteries soon.
Battery is low.
Replace the batteries with new ones.