Copyright, all rights reserved 7 Version 1 : 011107
Bluelab Combo Meter Bluelab Corporation Limited
5.0 Cleaning Probes and Meter Maintenance cont.
For accurate meter readings the pH probe is cleaned and recalibrated frequently.
The pH calibration involves cleaning the pH probe and then calibrating in two
solutions.
If a pH below 7.0 is being measured, use pH7.0 and pH4.0 calibration solutions.
If pH above 7.0 is being measured, use pH7.0 and pH10.0 calibration solutions.
If a message appears during the calibration process, such as 'e2: pH' then calibration
was unreliable. Description of errors and causes are described in Section 6.0 of
this document, titled 'Error Messages'. Follow these steps for meter pH calibration.
1
5.4 pH Calibration
Clean pH Probe
Clean the probe as described in Section 5.1 of this
document.
2
pH7.0 Calibration
Rinse probe thoroughly in fresh water, shake off excess
water and place probe in a pH7.0 calibration solution for
one minute or more.
Once meter reading is stable, press and hold CALIBRATE
button until display starts flashing. Release button and
press CAL 7.0 button once. The display stops flashing
when '7.0pH' is displayed.
3
pH4.0/pH10.0 Calibration
Rinse the pH probe thoroughly in fresh water, shake off excess water and place the
probe in either pH4.0 or pH10.0 calibration solution. Wait for a period of at least one
minute for reading to stabilize.
Press and hold CALIBRATE button until display starts flashing. Release button and
press CAL 4/10 button once. The display will stop flashing with '4.0pH' or '10.0pH'
displayed, depending on the solution used. The meter is now calibrated and ready
for use.
Figure 6. Typical
Calibration Display
Display
Flashing
pH7.0
Calibration
Solution
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