Z03.0.0X.6C-02 page 1 of 4
Operation instructions
GE ...
pH- and reference-electrodes
Specification:
Reference
Type Description Operating range
GE 014
GE 014 BNC
GE 100
GE 100 BNC
GE 101
GE 101 BNC
GE 103
GE 103 BNC
GE 104
GE 104 BNC
GE 106
GE 106 BNC
GE 107
GE 108
GE 108 BNC
GE 109
GE 117
Low Cost pH-electrode
Standard pH-electrode
Injection-electrode
Double chamberelectrode
Special grindingelectrode
Electrode for VE-Water
pH-electrode with int.
Pt1000-Sensor
Standard electrode,
pressure resistant
pH-electrode with int.
Pt100-Sensor
pH-electrode with int.
Pt1000-Sensor
pH 2-12, 0-60°C,
> 200 µS/cm
pH 0-14, 0-80°C,
> 200 µS/cm
pH 2-11, 0-60°C,
> 200 µS/cm
pH 0-14, 0-80°C,
> 200 µS/cm
pH 0-14, 0-80°C,
> 20 µS/cm
pH 2-11, 10-80°C,
> 25 µS/cm
pH 0-14, 0-80°C,
> 200 µS/cm
pH 0-14, 0-80°C,
> 200 µS/cm
pH 0-14, 0-80°C,
> 200 µS/cm
pH 0-14, 0-80°C,
> 200 µS/cm
electrolyte
3mol/l KCl
3mol/l KCl
3mol/l KCl
3mol/l KCl
1mol/l KNO3
3mol/l KCl
3mol/l KCl
3mol/l KCl
(Gel)
3mol/l KCl
(Gel)
3mol/l KCl
(Gel)
3mol/l KCl
(Gel)
Connection Notes
cinch-plug
BNC-plug
cinch-plug
BNC-plug
cinch-plug
BNC-plug
cinch-plug
BNC-plug
cinch-plug
BNC-plug
cinch-plug
BNC-plug
DIN-/bananaplug
cinch-plug
BNC-plug
BNC- and
MiniDIN-plug
BNC-/bananaplug
Pressure resistant
up to 6 bar. With
PG13.5 thread
Pressure resistant
up to 6 bar. With
PG13.5 tread
Pressure resistant
up to 6 bar.
Pressure resistant
up to 6 bar. With
PG13.5 thread
Working-pressure: pressure-less cartridge (GE 014, GE 100, GE 101, GE 103, GE 104, GE 106)
medium pressure max. 6 bar, depending on assembly conditions (GE 107, GE 108, GE 109, GE 117)
Diaphragm: 2 ceramic-diaphragm (GE 014, GE 100, GE 101, GE 103, GE 107, GE 108, GE 109, GE 117),
3 ceramic-diaphragm (GE 106) or grinding-diaphragm (GE 104)
Working-system: Ag/AgCl, chlorinated Ag-wire (GE 014, GE 100, GE 106, GE 107, GE 108, GE 109, GE 117)
Ag/AgCl-cartridge (GE 101, GE 103, GE 104)
Diaphragm-shape: Ball (GE 014, GE 100, GE 103, GE 106), cone (GE 101) or
cylinder (GE 104, GE 107, GE 108, GE 109, GE 117)
Electrode-flagpole: GE 014 transparent plastics-flagpole, approx. Ø12 x 110 mm
GE 100, GE 103, GE 106 transparent plastics-flagpole, appr. Ø12 x 120 mm
GE 101 glass-flagpole, Ø12mm, with injection spike approx. Ø6 x 50mm,
Full length appr. 120mm
GE 104 glass-flagpole, Ø12mm, full length appr. 120mm
Head: appr. Ø6 x 30mm,
GE 107, GE 108, GE 109, GE 117 black plastics-flagpole, appr. Ø12 x 120 mm
Cable length: 1m (standard-length) or 2m (standard length for GE107, GE108, GE109 and GE117)
GREISINGER electronic GmbH
Fax: +49402 / 9383-33
D - 93128 Regenstauf, Hans-Sachs-Straße 26 Tel.: +49402 / 9383-0
eMail: info@greisinger.de
Z03.0.0X.6C-02 page 2 of 4
Introduction:
All electrodes are delivered checked and ready for measuring. The warranty period is 6 months for appropriate
treating.
pH-electrodes are wearing parts and have to be exchanged when the demanded values are not complying with,
even after thoroughly cleaning the electrode and regenerating it, depending on chemical and mechanical strain.
When using please consider that different substances in aqueous solution may affect glass and that chemicals may
react with the KCL-dilution in the electrode and could block the diaphragm
Examples: - protein-containing dilutions, as used in medicinal and biological measuring, the protein could be de-
natured by the KCl-dilution
- coagulated lacquers
- dilutions containing higher concentration of silver-ions
Other problems could happen when measuring ion-depleted and solvent-containing mediums. The problems occurring measuring these mediums could partly be solved by using our double-chamber electrode with appropriate
bridge-electrolyte (different, depending on use) (type GE 103)
Substances that deposit on the diaphragm, influence the measuring and have to be removed regularly. This can be
done with the help of e.g. automatic-cleaning-facilities.
Different fields of application
1. Measuring ion-depleted mediums (rainwater, aquarium-water, VE-water)
Our Type GE 104 (special-grinding-electrode from 20 µS/cm) or GE 106 (from 25 µS/cm)
2. Seawater-aquarium
Normal pH-single-rod measuring cells with 3 mol/l KCl (type GE 100)
3. Photo-laboratories
Double-chamber-electrode (type GE 103) with bridge-electrolyte. (front chamber 1 mol/l KNO
mol/l KCl). Watering-cap for storing the electrode has to be filled with 1 mol/l KNO
.
3
, rear chamber: 3
3
4. Swimming-pool
Standard pH-electrode with 3 mole/l KCl (type GE 100 or GE104)
5. Ground survey
Glass-electrode with different diaphragms (type GE 101). Use our pre-injection-spike! (our type VD120)
6. Cheese, fruits, meat
Injection-electrode (type GE 101). When measuring cheese, milk and other products containing protein, the
electrode has to be cleaned wit a special cleaning-fluid (pepsin-cleaning agent – e.g. contained in working and
calibration set)
Normal cleaning: Put the electrode for 10 min. in the pepsin-cleaning agent GRL100 (0,1 mole HCl with pepsin)
The lifetime of electrodes is normally at least 8-10 months, when treating and cleaning the electrodes thoroughly it
can be risen up to over 2 years. Exact statements can not be given, because it depends on the relative case of
operation.
When the pH X-Value can not be set, this is a sign that
a) the electrode is exhausted and has to be exchanged or
b) the buffer-dilution has exhausted (prepare new dilution). Prepared buffer-dilutions have a limited life time
(about 1 month) when using/calibrating it thoroughly (no procrastination of buffer-dilution-residua from one dilu-
tion to an other through cleaning and drying the electrode not enough)
Buffer-capsules have no lifetime limitations, therefor we recommend keeping a sufficient number of them in stock.
PH12-buffer-capsules (white) have to be stored in an exsiccator or stored together with drying agent.
The electrolyte (3mol/l KCl) should always be available for refilling, its also recommended to keep enough in stock.
Z03.0.0X.6C-02 page 3 of 4
General maintenance and measuring instructions for pH-combination-electrodes
This pH-electrode has been tested and has been subordinated strict quality controls in all manufacturing-steps
1. To keep the optimum efficiency and accuracy for a long time take care of the following points:
1.1. Remove the storing protection-cap form the pH-glass-diaphragm and clean the glass-rod and the diaphragm
with distilled water. After that dry the diaphragm and the glass rod with a soft paper towel.
1.2. Important! The pH-glass-diaphragm has to be kept wet. When not in use the electrode must be stored in 3
mole/l KCl-dilution. (except GE 103 – here 1 mol/l KNO
ficiency and the responsiveness are affected. To continuously moistening the electrode store it in 3 mol/l KCldilution for 24 hours. (except GE 103)
A longer storage of a single-rod-electrode or a reference-electrode in destined water will deplete them of KCl.
Please refill KCl-electrolyte (saturated or 3 mole) in time (except GE 103)
1.3 Do not touch the glass-diaphragm! Damages on the surface and attrition affect the efficiency negatively.
1.4 Before using perform a visual check of the pH-electrode. Should there be air-bubbles in the pH-glass-
diaphragm or the outer reference-electrode you can get them out by shaking the electrode downward (like
handling a quicksilver-fibre-thermometer)
1.5 Take care that the side diaphragm contacts the media you want to measure.
Minimum depth for GE 100 e.g. 20 mm, maximum 50 mm
1.6 Keep cable and plug of the electrode always clean and dry. When not, the electric insulation will be lost,
through this measuring errors may occur.
1.7 The electrode has to be stored in dry rooms at temperatures between 10°C to 30°C. Below –5°C the electrode
may be damaged because the electrolyte may freeze.
2. care and maintenance
2.1 check the liquid level of the reference-electrode regularly and refill it with 3 mole KCl with the help of an
injection or a pipette. (except GE 107, GE 108, GE 109 an GE 117)
2.2 Crystallisation of the 3 mole/l KCl (3 mole KCl) is inevitable! Crystallised KCl on the protection-cap and the
breech-collar can be removed with fingernails or a paper towel. This is no defect or a reason for reclamation.
2.3 Contaminated electrodes have to be cleaned. The suitable cleaning agents for the pH-glass-diaphragm are
given in the table below:
contamination cleaning-agent
general deposits mild washing-agent
inorganic coatings common fluids for glass cleaning
metallic compounds 1 mole/l HCl-dilution
oil, fat special cleaning agents or solvent
biological coatings with protein pepsin-enzyme in 0,1 molar HCl-dilution (GRL100)
resin-lignin acetone
extreme resistant deposits hydrogen peroxide, sodium hypochloride
). Should the pH-glass-diaphragm be dried out, the ef-
3
The distinct materials of the electrode have to be considered when choosing the cleaning agent.
E.g. electrodes with plastics shaft must not be cleaned with solvents. In case of doubt please contact the
manufacturer for further advice.
The same has to be considered when using aggressive or other, non water based agents!
Z03.0.0X.6C-02 page 4 of 4
Operating instructions:
a) The electrode must be stored in 3 mol/l KCl (ours type: KCl3M), in order to avoid drying out (excluded GE103).
b) The electrodes must only be used with the suitable devices. Wen using inappropriate devices the electrode and
the device can be damaged or destructed!
c) Device and sensor must be treated well and must be used according to the given technical specification (do not
throw, bounce, etc...). Plug and sockets of the device and the electrode must be protected from contamination
and humidity.
d) Before measuring the protection-cap has to be removed.
e) Calibrating of the measuring cell (single-rod measuring cell or measuring- and reference-electrode) have to be
done according to the manufacturers instructions buffer-dilution with a value that is near the measuring cell (e.g.
pH 7,0) the “asymmetry” is set. For the slope (pH X) a second buffer-dilution is used which pH-Value should be
within the measuring range (e.g. pH 4,0; pH 10,0; pH12,0), but at least 2 pH-units different form the buffer-
dilution used first.
f) Our pH-electrodes can be used in a degree range from 90° to ±45° compared to horizontal
Disposal instructions
Exhausted pH-electrodes must be disposed via special refuse. When delivering exhausted electrodes from our
product range, free for us (sufficient post paid), we will dispose them for free.
Safety regulations
This device was designed and tested considering the safety regulations for electronic measuring devices.
Faultless operation and reliability in operation of the measuring device can only be assured if the General Safety
Measures and the devices specific safety regulation mentioned in this users manual are considered.
1. Faultless operation and reliability in operation of the measuring device can only be assured if the device is used
within the climatic conditions specified in the chapter “Specifications“.
2. When transporting the device from a cold to a warm environment, condensation could affect the device’s func-
tion. In this case you have to wait until the device has the same temperature as the environment before using it.
3. When connecting the device to other devices the interconnection has to be designed most thoroughly, as inter-
nal connections in third-party devices (e.g. connection of ground with protective earth) may lead to undesired
voltage potentials that can affect the connected devices, could damage them or even may destruct the devices.
4. The device must be switched off and must be marked against using again, in case of obvious malfunctions of
the device which are e.g.:
- visible damage.
- the device is not working as prescribed.
- storing the device under inappropriate conditions for longer time.
When not sure, the device should be sent to the manufacturer for repairing or servicing.
5. Attention: Do NOT use this product as safety or emergency stopping device, or in any other application where
failure of the product could result in personal injury or material damage.
Failure to comply with these instructions could result in death or serious injury and material damage.
6. The electrodes contain 3 molar KCL (GE103: 1mol/l KNO
First-Aid-provisions
After contact with skin: clean with sufficient water.
After contact with eyes: rinse opened eye with sufficient water, contact oculist
After swallowing: drink much water. When feeling sick, contact doctor.
), which is acidly.
3
7. Attention! The electrodes containing glass. If the ph-electrode is damaged please abolish the medium being
measured! If swallowed gullet and gastrointestinal tract could be injured.
Z01.0.01.6C-02
Working and calibration set GAK 1400
The set consisting of: 5x GPH 4.0 ; 5x GPH 7.0 ; 5x GPH 10.0 ; 3x GPF 100 ; 1x KCl 3M ; 1x GRL 100
Operating information:
Please observe the safety instructions of the contained chemical substances
(Note: the appropriate material safety data sheets are available on our homepage)
How to prepare a calibrating solution:
- Fill 2 plastic bottles with 100 ml distilled water (eg battery water) each. 100 ml will cover the entire cylindrical area, ie
approx. 55 mm as of bottle base.
- Open pH 7 capsule (green) carefully (turn one half of the capsule while pulling and make sure not to spill any solution);
put content (including both capsule parts) into one of the bottles.
- Put content of pH 4 capsule (orange) (resp. pH 10), including both capsule parts, in the second bottle.
The capsule shell will colour the liquid with the respective characteristic colour:
orange = pH 4.0; green = pH 7.0, blue = pH 10.0
Make sure to prepare buffer solutions in time as they can only be used after 3 hours. Shake well before use.
Eventually the capsules won't resolve totally. The residues can stay in the liquid without any negative effect, or they can be
removed after colouring the liquid.
The buffer solutions have a limited operational life of 3 - 4 months and should be renewed after this period. The capsules
itself are practically stable for an unlimited time and should be kept in reserve.
General maintenance and measuring instructions for pH combi-electrodes:
Make sure to observe the following points to maintain optimum capacity and accuracy of electrode as long as possible:
- Important! Make sure to always keep pH-glass diaphragm in a slightly moist condition. If electrode is not used, the
pH-glass diaphragm has to be immersed into a 3 mol/l KCl solution for storage.
Drying out of the pH-glass diaphragm will affect both its capacity and sensitivity. In order to wet it throughout, put glass
diaphragm in a 3 mol KCl solution for 24 hours.
- Check liquid level of reference electrolyte at regular intervals; if necessary top up with 3 mol/l KCl solution through filling
hole using a syringe or pipette.
- As they will influence the measurements, any deposits that may accumulate on the measuring membrane or diaphragm
have to be removed regularly.
When conducting measurements in cheese, milk and other products containing proteins, a special cleaning agent
GRL100 (pepsin solution) has to be used for cleaning of the electrode.
- Dirty electrodes have to be cleaned. You will find suitable cleaning agents for the pH-glass diaphragm in the following table:
Contamination Cleaning agent
Various deposits Light cleaning agent
Inorganic coatings Commercial liquids for cleaning of glass
Metal compounds 1 mol/l HCI solution
Oil, grease Special cleaning agents or solvents
Biological coatings containing proteins 1 % pepsin enzyme in 0.1 molar HCI solution
Resin-lignines Acetones
Highly resistant deposits Hydrogen superoxide, sodium hypochloride
GREISINGER electronic GmbH
D - 93128 Regenstauf, Hans-Sachs-Straße 26
Tel.: +49 9402 / 9383-0, Fax.: +49 9402 / 9383-33, eMail: info@greisinger.de
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