4
4.3 Calibration procedure
• Rinse pH electrode briefly in distilled
water and place in
pH 7 buffer solu-
tion
.
• Wait for around 1 minute, until the mea-
sured value reading remains constant.
• Carry out pH 7 calibration
• Rinse pH electrode briefly in distilled
water and place in
pH 4 calibrating
solution.
• Wait for around 1 minute, until the dis-
played measured value remains con-
stant.
• Carry out pH 4 calibration.
The pH electrode is now ready for use.
5 Care and maintenance
5.1 Cleaning
Clean dirty electrodes with a soft cloth. IMPORTANT: The spherical elec-
trode tip is highly sensitive and should be dabbed, not rubbed! Then
rinse and calibrate.
5.2 Service life
All pH electrodes are subject to wear and normally have a service life
of 12 to 18 months. The ageing process varies, depending in particu-
lar on the water hardness: Hard water prolongs the service life, soft
water shortens the service life. The following factors may accelerate the
ageing process considerably: Covering with algae/bacteria, soiling,
high temperature, mechanical strain or electric fault currents in the
aquarium.
5.3 Special information
• Never allow a pH electrode to dry out! When pH electrodes are to remain
out of use for a prolonged period, fill Quali-Safe electrode protector with
KCl solution and fit onto electrode tip. Screw lid into place.
• Should the electrode inadvertently be allowed to dry out, you can
attempt to restore it to working order by placing it in KCl solution for
24 h, with the electrode tip submerged by approx. 2 cm. Then rinse
electrode with distilled water and calibrate.
• DO NOT store electrode in distilled water!
• Do not store the electrode at over 30 °C or under 0 °C. Protect from frost.
• Do not submerge electrode completely under water! The electrode cap
must always be at least 2 cm above the surface of the water.
• Keep connector clean and dry at all times.
• Install the electrode at a spot in the aquarium which is as dark as
possible, so as to avoid it becoming covered in algae. Electrode tips
coated with algae may have a detrimental effect on measuring accu-
racy. We recommend the
DENNERLE pH electrode holder
with
light shield to prevent algae formation
.
Fault
Electrode responds very
sluggishly or no calibra-
tion possible
pH display does not res-
pond or is unstable
Cause
Electrode dirty
Air bubble in electrode tip
Calibrating solutions are
contaminated/too old
Buffer solutions are
contaminated/too old
pH measuring device
defectiv
BNC connector not
connected, corroded or
wet
Remedy
Clean electrode
Shake electrode (like
a thermometer)
Use fresh buffer soluti-
ons, repeat calibration
Connect new electrode.
Calibrate again after 1
week!
Have
the
device
examined by our after-
sales service staff
Check BNC contact,
clean if necessary
• Do not install electrode cables together with other electric cables
over long distances. In this way, you can avoid the possibility of
other electric circuits influencing the measurement results.
• Do not kink the electrode cable.
• IMPORTANT: If the pH electrode is not in the aquarium water, the devi-
ce will be unable to perform its measurement and control functions cor-
rectly – which may put your fish in danger! You should therefore check
the position of the electrode and the water level on a regular basis!
6 What if ... – Troubleshooting
7 Spare parts and useful accessories
(available from specialist retailers)
1445 pH 4 buffer solution, 50 ml
1446 pH 7 buffer solution, 50 ml
1452 Distilled water, 250 ml
1448 KCl solution, 3 molar, 50 ml
3091 Calibrating station
3094 pH electrode holder
8
Guarantee:
All DENNERLE pH electrodes are tested
individually and supplied ready for use. Guarantee period: 12 months
(wearing part)
When submitting guarantee claims, please send the equipment to
Dennerle's Customer Service department
together with the recei-
pt providing proof of purchase.
The guarantee covers manufacturing and material defects. Defective
parts will be replaced or repaired free of charge during the guarantee
period, provided that the equipment has been used only in the correct
manner and for the intended purpose. No claims shall be assertible
beyond the value of the device, e.g. for damage to fish or plants.
We reserve the right to carry out technical modifications.
Sales:
DENNERLE GmbH, D-66957 Vinningen
Customer service:
DENNERLE GmbH, Industriestrasse 4,
D-66981 Münchweiler, www.dennerle.de
Made in Germany
7
6
5
pH 7
pH 4
GA pH-Elektrode:GA pH-Elektrode
03.11.2008 16:31 Uhr Seite 7
