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pH electrode for aquaria
For continuous measurement of the pH value in fresh water and sea water aquaria
- Instructions for use: please read carefully and keep in a safe place. -
Congratulations on purchasing this high-quality pH electrode from DENNERLE. If used properly and treated with due care, this set will provide a simple, conveni-
ent and reliable means of supplying your aquarium with CO
, the most important fertilizer for aquarium plants - thus ensuring magnificent plant growth. CO
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serves to establish an ideal pH value for fish and plants, in the slightly acidic to neutral range. DENNERLE wishes you hours of fun with your aquarium!
Safety instructions
• All cables leading out of the aquarium must be provided with a drip loop to prevent
• Always disconnect all devices located in the water from the power supply before pla-
1 Which equipment can the
pH electrode be used with?
The DENNERLE pH electrode for aquaria works perfectly in combination
with digital pH controllers 588 and 588 Comfort from DENNERLE.
Equally, it can also be used with all other standard pH measuring and
control devices with BNC connector. Please observe the instructions for
use of the device concerned!
2 What's what
Plastic stem
Electrode cap
Connecting cable, 3 m
BNC connector
Quali-Safe electrode protector
Electrode tip with membrane
3 Connecting
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the pH electrode
• Unscrew the lid of the Quali-Safe
electrode protector and carefully
remove the electrode.
• Rinse electrode tip briefly under run-
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ning tap water, in order to remove
residual KCl solution.
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Profi-Line
any water which may run down the cables from reaching items of equipment or the
mains socket outlet.
cing your hands in the aquarium water.
• Connect BNC connector to pH controller
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or pH measuring device.
4 Calibrating the pH electrode
4.1 Purpose of calibration and calibration interval
Any measuring instrument can only be as accurate as the connected sen-
sor. The pH electrode is thus a vitally important part of your pH measu-
ring device.
As every pH electrode may drift somewhat in the course of time, it is
crucial to calibrate the pH electrode
-
when putting it into operation for the 1st time
-
after the 1st week
-
and then every 4 to 6 weeks (under normal operating conditions),
in order to ensure correct functioning of the electrode and the qua-
lity of the measurement results.
4.2 Preparations for the calibrati-
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on process
Ideal temperature of the calibrating soluti-
ons: 20-25 °C.
Pour pH 7 and pH 4 calibrating solution into
two separate, clean receptacles up to a level
of approx. 2 cm. Pour a little distilled water
into a third receptacle.
Please note: The accuracy of the calibration depends above all on the qua-
lity of the employed calibrating solutions. We thus recommend original
DENNERLE calibrating solutions.
Do not carry out calibration in the supply bottles - water on the pH elec-
trode may alter the calibrating solutions!
GB
4.3 Calibration procedure
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• Rinse pH electrode briefly in distilled
• Wait for around 1 minute, until the mea-
also
2
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• Carry out pH 7 calibration.
• Rinse pH electrode briefly in distilled
• Wait for around 1 minute, until the dis-
• 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 36 months, i.e. the average life is around 24 months. The
level of wear varies according to water hardness, acid content of the
water, germ load, algal growth, general fouling, mechanical strain,
care, etc.
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 submerge electrode completely under water! The electrode cap
must always be at least 2 cm above the surface of the water.
• Install the electrode in the darkest possible part of the aquarium, to
avoid exposure to algal growth. Electrode tips coated with algae
may have a detrimental effect on measuring accuracy.
• 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
water and place in pH 7 calibrating
the position of the electrode and the water level on a regular basis!
solution.
6 What if ... – Troubleshooting
sured value reading remains constant.
Fault
Electrode responds very
sluggishly or no calibra-
water and place in pH 4 calibrating
tion possible
solution.
played measured value remains con-
stant.
pH display does not res-
pond or is unstable
7 Spare parts and useful accessories
(available from specialist retailers)
1445 pH 4 calibrating solution, 50 ml
1446 pH 7 calibrating solution, 50 ml
1452 Distilled water, 250 ml
1448 KCl solution, 50 ml
Guarantee: 6 months (wearing part)
For further information on the range of aquarium plants and accesso-
ries from DENNERLE, consult your dealer or check out DENNERLE's free
professional tips!
DENNERLE professional tips are available from your dealer and on the
internet at www.dennerle.de!
Sales:
Customer service: DENNERLE GmbH, D-66981 Münchweiler
Cause
Remedy
Electrode dirty
Clean electrode
Calibrating solutions are
Use fresh calibrating
contaminated/too old
solutions, repeat cali-
bration
Electrode worn out or
Connect new electrode
defective
Calibrate again after 1
week!
pH measuring device
Have the device
defectiv
examined by our after-
sales service staff
BNC connector not
Check BNC contact,
connected, corroded or
clean if necessary
wet
DENNERLE GmbH, D-66957 Vinningen
www.dennerle.de
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