Bluelab pH Pen Bedienungsanleitung PDF herunterladen (Seite 7)

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9.0 Troubleshooting guide

Trouble Reason Correction

Drift - readings

slowly varying

Glassware not clean Clean glassware, hydrate and calibrate.

Wick contaminated

or blocked

Soak probe in KCl storage solution for 24

hours and retest. Do not measure proteins or

oils with this unit. Replace unit.

Glassware aged Replace unit.

Displays similar pH

reading in all buffers

no matter what the

buffer value is

Glassware broken Replace unit.

Unsuccessful

calibration

Buffers inaccurate Replace buffers.

Glassware not clean Clean glassware.

Glassware aged

(glassware will not

clean)

Replace unit.

Probe not hydrated Soak probe in KCl storage solution for 24

hours and retest.

Noisy - readings

jumping

Contact zone not

immersed

Lower pen into solution at least 2cm/1”.

Displays pH 7

for all buffers

Broken glassware Replace unit.

Incorrect sample

reading following

successful

calibration

Ground loop (often

occurs in process

systems)

Verify by removing the sample from its

environment and measuring in a glass

beaker. May require electrical circuitry to be

checked in system.

Wick blocked Soak probe in KCl storage solution for 24

hours and retest. Do not measure proteins or

oils with this unit. Replace unit.

8.0 Error messages

The following error messages appear for the following reasons.

Temperature

over range

pH calibration

failed

pH over

range

Hardware error

pH under

range

Temperature

under range

1 2 3 4 5 6 7 8 9

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