Maintenance
C A U T I O N
Multiple hazards. Only qualified personnel must conduct the tasks described in this
section of the document.
Clean the sensor
Clean the sensor when:
• "SENSOR?" shows on the display
• Stabilization is slow
• Results drift or are not accurate
• Calibration failure occurs
1. Soak the sensor in the applicable cleaning agent. Refer to Table 3.
2. Rinse or soak the sensor in deionized water for 1 minute.
Table 3 Cleaning agents
Contaminant Cleaning agent Time
Grease, oils and fats Electrode cleaning solution 2 hours maximum
Mineral buildup 10% hydrochloric acid (HCl) solution 5 minutes maximum
Replace the batteries
When the battery icon flashes or the tester will not come on, replace all four batteries.
Refer to Install the batteries on page 5.
Replace the sensor
Note: Only Pocket Pro+ testers have replaceable sensors.
To replace the sensor, refer to the instructions supplied with the sensor.
Troubleshooting
Message Possible cause Solution
SENSOR? The calibration slope is ±10–15%. Gently clean the sensor. Refer to Clean the sensor
on page 10.
ECAL Calibration failure. The pH calibration
slope is greater than ±15%.
Gently clean the sensor. Refer to Clean the sensor
on page 10. Calibrate again. If calibration failure continues,
replace the tester or sensor as applicable.
"- - - -"
(top line)
The parameter value is not within the
measurement range of the tester. Refer to
Specifications on page 2.
Make sure that the value of the sample is within the
measurement range of the tester. Gently clean the sensor.
Refer to Clean the sensor on page 10. Calibrate as
necessary.
"- - - -"
(bottom line)
The temperature value is not within the
operating temperature range of the tester
or a temperature sensor failure occurred.
Refer to Specifications on page 2 for the
operating temperature range.
Make sure that the sample temperature is within the
operating temperature range of the tester. Contact
technical support as necessary.
Note: The tester can still be used if a temperature sensor failure
has occurred, but without automatic temperature compensation.
Battery icon
flashes
The batteries have less than 10% power
remaining.
Replace all four batteries. Refer to Install the batteries
on page 5.
10
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