9
Screen
3-color LCD screen,
Blue: Measurement; Green: Calibration; Red: Alarm
Reading Lock
HOLD
Low-Voltage Warning
flashing, reminder of battery replacement needed
Auto. Power-Off
In 8 minutes without operation
Waterproof Rating
IP67
Power
DC3V, AAA alkaline batteries×4
Battery Life
Operation up to 2000 hours
Dimension & Weight
Tester: 40×40×178mm/133g; Case: 255×210×50mm/700g
12. Probe Replacement
12.1 Every pH probe gradually loses its sensitivity and will eventually fail. A typical service life of a
pH probe is 1-2 years depending on many factors such as frequency of use, nature of test
samples, and how well it is maintained, etc. Apera Instruments recommends replacing the pH
probe every 1 to 2 years to guarantee the optimal performance.
12.2 To replace a probe: 1) Take off the probe cap; 2) Screw off the
probe ring; 3) Unplug the probe; 4) Plug in the new replacement
probe (pay attention to the probe’s position); 5) Screw on the
probe ring tightly. Soak the probe in 3M KCL for 5-15 minutes.
Then perform calibration before testing.
12.3 The replacement probes compatible with PH5F:
•
AI1201 PH60-E (Regular pH glass bulb probe for general water solutions)
•
AI3711-E PH60-DE (Double-junction pH glass bulb probe for complex solutions)
•
AI1205 PH60S-E (Spear pH probe for soft-solids pH testing)
•
AI1203 PH60F-E (Flat pH probe for surface pH testing)
•
AI1207 ORP60-E (ORP probe)
13. Notes
a) Avoid testing in very high (> 113 °F/ 45°C) or very low (< 41 °F/ 5°C) temperature solutions as
it will cause greater measurement error and potential damage to the probe. Test your samples
and perform calibration close to room temperature as much as possible.
b)
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.