(4.3) Handling Buffer Solutions; The Main Display Page (Normal Conditions) - JBL ProFlora Manual De Instrucciones

negative direction, depending on whether measurements are above or below 7.00.
When a new sensor is dipped into pH 4.00 buffer solution, the voltage is approx. 177
mV. If the sensor has aged, voltage measured at pH 7.00 usually shifts into the nega-
tive range. For example, in 7.00 buffer solution, -28 mV is measured. In addition, the
voltage difference per full pH unit decreases. For example, for pH 4.00 buffer solution,
110 mV can still be indicated, which would correspond to a difference of 46 mV per pH
unit. For pH 7.00 the JBL pH Control accepts a shift of up to 115 mV and a reduction
in voltage difference per full pH unit of up to 35 mV. For measurements outside these
limits the sensor is rejected as faulty at the end of calibration.
The average service life of a pH sensor is 24 months. Depending on handling and care,
ageing can be faster or slower. The ageing process is accelerated by the continual
measurement of extreme pH values, neglected calibration, dirt etc. Regularly storing
the sensor in JBL Storage and Revitalisation Solution for 12 – 24 hours e.g. before each
calibration, can extend the service life.

(4.3) Handling buffer solutions.

Each pH measurement is only as good as the calibration carried out. In your own
interest, we recommend the following:
•
Store the JBL Storage and Revitalisation Solution in a cool place out of the reach of
children.
•
Always pour a fresh amount of buffer solution from the storage bottle for each ca-
libration.
•
Never re-use old buffer solution, always dispose of it at the end of each calibrati-
on.
•
Never pour used buffer solution back into the storage bottle.

(5) The main display page (normal conditions)

As long as no key has been pressed, the following display page permanently displays
the most important processes in your aquarium relating to the pH value and CO
supply.
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