Note On Handling Ph Sensors; (4.1) Handling And Care; (4.2) Service Life Of The Sensor - JBL ProFlora Manual De Instrucciones

(4) Note on handling pH sensors

The pH sensor is the most delicate part of the whole measuring equipment and there-
fore needs special care in handling. If the following handling tips are followed, the
sensor will provide accurate measurements over a long time.

(4.1) Handling and care

•
Avoid hard impacts and take particular care when handling the delicate sensor tip
made of special glass.
•
Avoid kinks in the sensor cable.
•
Never allow the sensor tip to dry out.
•
Sensor tips which have accidentally dried out can often be reactivated by being
placed in storage or revitalisation solution for 24 hours or longer. The same often
applies to sensors which can no longer be successfully calibrated. Pour about 2 – 3
cm of JBL Storage and Revitalisation Solution in the storage tube supplied with the
sensor, place the sensor in the solution until the tip is submerged and tighten the
screw lid with washer. For safe storage, place the storage tube with the sensor in
the storage hole on the calibration stand.
•
Sensors which are not in use for a longer period of time should always be placed in
JBL Storage and Revitalisation Solution, as already described.
•
Never fully immerse the sensor in the water. The sensor cap and cable connection
should always be out of the water. Ideally the sensor should be immersed to the top
of the writing on the sensor shaft (JBL pH Sensor).
•
The sensor should be positioned in the darkest part of the aquarium to prevent al-
gae growing on the tip. Algae growth could lead to incorrect measurements.
•
Do not lay the sensor cable next to mains current-bearing cables for long dis-
tances.
•
If the sensor is accidentally pulled out of the water or the water level drops signifi -
cantly, the device will measure incorrectly and adjust accordingly. This is dangerous
for the fi sh. Regular checking is recommended.
•
Any dirt that has accumulated on the tip of the sensor can be carefully wiped off
with a soft cloth, never rubbing vigorously, but dabbing. Store the sensor in JBL Sto-
rage and Revitalisation Solution for 24 hours, then calibrate.

(4.2) Service life of the sensor

pH sensors automatically deteriorate over time, referred to as ageing. Ageing begins
from the day of manufacture. The voltage delivered by the sensor tip and recorded
by the measuring device and transformed into pH units gives an indication of the
condition of the sensor. The voltage in mV (millivolt) can be read directly from the JBL
pH Control .
When dipped into pH 7.00 buffer solution, a brand-new sensor shows a voltage of
0 +/- less mV. This voltage changes per full pH unit by about 59 mV in a positive or
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