User Manual
8
Solution
Temperature
compensation factor
Solution
Temperature
compensation factor
NaCl
2.12%/˚C
10% Hydrochloric acid
1.32%/˚C
5% NaOH
1.72%/˚C
5% Sulfuric acid
0.96%/˚C
Dilute ammonia
1.88%/˚C
8
Probe Cleaning
8.1 The tester is only as accurate as the probe is clean. Always thoroughly rinse off the probe before and
after each measurement with pure water in a container or with a wash bottle.
8.2 For tough contaminants, detach the sensor shield, soak the probe in Apera probe cleaning solution
(AI1166) or detergent water for 30 minutes. Then use a soft brush to remove the contaminants.
Afterwards, soak the probe in 3M KCL soaking solution for at least 1 hour. Rinse it off, then re-calibrate
the tester before using again.
9
Probe Storage
9.1 Under regular usage (daily or weekly use), make sure the probe cap is wet, and tightly close the cap with
the O-ring.
9.2 For long-term storage (you are not going to use the product for a while), add 3M KCL soaking solution
to the Fill line in the probe cap and store the probe in it. Close on the probe cap tightly with the O-ring.
9.3 If you find white crystals inside or outside the probe cap, it is perfectly normal. It is the 3M KCL soaking
solution that crystalizes over time by its nature. Just rinse them off and add in new soaking solution.
This chemical is not poisonous nor dangerous, and the probe’s performance will not be affected at all.
9.4 NEVER store the probe in pure water like tap, RO, distilled, or deionized water as they could damage
the pH probe. If this happens, immediately soak the pH probe Apera 3M KCL soaking solution overnight,
then re-calibrate it before using. Pure water is only for rinsing the probe.
10
Parameter Settings
Symbol
Parameter Setting Contents
Code
Factory
Default
P1
Select pH buffer standards
USA – NIST
USA
P2
Select automatic lock
Off – On
Off
P3
Select backlight
Off - 1 - On
1
P4
Temperature compensation factor
0.00 - 4.00%
2.00%
P5
TDS factor
0.40 - 1.00
0.71
P6
Salinity unit
ppt - mg/L
ppt
P7
Select temperature unit
˚C - ˚F
˚F
P8
Back to factory default
No – Yes
No