Hanna Instruments HI6421, Instruction Manual, Page: 58 / 64

Maintenance 58
.CSV file format naming convention
Files within a data package have the measurement unit automatically included in the file name.
Manual or Autohold logged files retain the distinction between different reading modes in the file name. Users
have the option to input file name:
• 20220920_072224‑ DO _auto.CSV
• 20220920 071058‑ DOSAT 002.CSV
Autohold with Autohold logging
1. Select Direct/Autohold in the Reading Mode ( Reading tab).
2. Select Autohold under Logging Type ( Logging tab).
With Autohold enabled (tap and
D
) the user will see log points stored only when the stability criteria
is met (
Autohold
displayed).
Once the hold value is found, the meter stores this value as a log point into a manual log file.
No other point is stored unless the Autohold is removed (tap
DO
) and the stability criteria is met again.
Whenever Autohold and Autohold logging are enabled together, the user will only see one log point.
3. Tap
DO
to restore direct measurements.
4. To measure the next sample, move sensor into the next sample.
5. Tap to initiate a new Autohold data point.
6. To measure/record additional samples, tap between samples to release the Autohold feature.
13. MAINTENANCE
13.1. BENCHTOP GENERAL CLEANING
The following steps outline the process to ensure users keep the benchtop clean and disinfected while limiting
the risk of damage from unsuitable cleaners.
• Disinfect the screen using commercially available non‑ammonia glass or disinfectant cleaner.
• Apply a small amount of cleaner directly to a microfiber or lint‑free disposable cloth.
Make sure the cloth is damp and not wet.
• Wipe the glass touchscreen clean with the cloth. Do not apply cleaner directly to the interface.
13.2. OPTICAL PROBE (HI7641133)
General Maintenance
• Inspect O‑ring for nicks or other damage. Replacing the o ring is advised.
• Do not substitute other grease or lubricants as it may cause the O‑ring to swell.
• After long‑term storage or cleaning, calibrate the probe.
• After use, rinse the probe with tap water and dry it.
• The DO cap must be kept hydrated.