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Maintenance
Clean the sensor
Contaminant
Grease, oils and fats
Mineral buildup
Replace the batteries
Replace the sensor
Troubleshooting
Message
SENSOR?
The calibration slope is ±10–15%.
ECAL
Calibration failure. The pH calibration
slope is greater than ±15%.
"- - - -"
The parameter value is not within the
measurement range of the tester. Refer to
(top line)
Specifications
"- - - -"
The temperature value is not within the
operating temperature range of the tester
(bottom line)
or a temperature sensor failure occurred.
Refer to
operating temperature range.
Battery icon
The batteries have less than 10% power
flashes
remaining.
10
Multiple hazards. Only qualified personnel must conduct the tasks described in this
section of the document.
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
2. Rinse or soak the sensor in deionized water for 1 minute.
Table 3 Cleaning agents
Cleaning agent
Electrode cleaning solution
10% hydrochloric acid (HCl) solution
When the battery icon flashes or the tester will not come on, replace all four batteries.
Refer to
Install the batteries
Note: Only Pocket Pro+ testers have replaceable sensors.
To replace the sensor, refer to the instructions supplied with the sensor.
Possible cause
on page 2.
Specifications
on page 2 for the
C A U T I O N
on page 5.
Gently clean the sensor. Refer to
on page 10.
Gently clean the sensor. Refer to
on page 10. Calibrate again. If calibration failure continues,
replace the tester or sensor as applicable.
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
necessary.
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.
Replace all four batteries. Refer to
on page 5.
Table
3.
Time
2 hours maximum
5 minutes maximum
Solution
Clean the sensor
Clean the sensor
on page 10. Calibrate as
Install the batteries
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