Bluelab Soil pH Pen - Manual (Page 13)

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13
13.0 Troubleshooting guide
Trouble Reason Correction
Drift - readings
slowly varying
Glassware not clean Clean glassware and calibrate
Wick contaminated,
blocked or dry
Soak probe in Bluelab pH Probe Storage
Solution or tap water only for 24 hours and
retest. Do not measure proteins or oils with this
unit. Replacement of unit may be required
Glassware aged Replace unit
Displays similar pH
reading in all buffers
no matter what the
buffer value is
Glassware cracked
or broken
Replace unit
Unsuccessful pH
calibration
Buffers inaccurate Replace buffers
Glassware not clean Clean glassware
Glassware aged
(glassware will not
clean)
Replace unit
Probe not hydrated Soak probe in Bluelab pH Probe Storage
Solution or tap water only for 24 hours and
retest. Do not measure proteins or oils with this
unit. Replacement of unit may be required
Noisy - readings
jumping
Contact zone not
immersed
Ensure soil/substrate is damp
Probe not
adequately hydrated
Soak probe in Bluelab pH Probe Storage
Solution or tap water only for 24 hours and
retest. Do not measure proteins or oils with this
unit. Replacement of unit may be required
Displays pH 7
for all buffers
Glassware broken Replace unit
Incorrect sample
reading following
successful pH
calibration
Wick blocked Soak probe in Bluelab pH Probe Storage
Solution or tap water only for 24 hours and
retest. Do not measure proteins or oils with
this unit. Replacement of unit may be required