GHM GREISINGER G 1500 Installation instructions

Compact manual
G 1500 series
pH / Redox measuring device
EN

Table of contents G 1500 series
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Table of contents
1 About this documentation......................................................4
1.1 Foreword........................................................................................4
1.2 Legal notices..................................................................................4
1.3 Further information.........................................................................4
2 Safety.......................................................................................5
2.1 Explanation of safety symbols ........................................................5
2.2 Foreseeable misuse .......................................................................5
2.3 Safety instructions..........................................................................6
2.4 Intended use...................................................................................6
2.5 Qualified personnel.........................................................................7
3 The device at a glance............................................................7
3.1 Display elements............................................................................7
3.2 Connections ...................................................................................8
3.3 Operating elements........................................................................9
4 Operation...............................................................................10
4.1 Opening the configuration menu...................................................10
4.2 Adjustment of the measuring input (only available at G 1501)......13
5 Measurement Basics.............................................................14
5.1 pH measurement..........................................................................14
5.1.1 Explanation...................................................................................14
5.1.2 pH electrode.................................................................................15
5.1.3 Further information.......................................................................16
5.1.4 Service life....................................................................................16
5.1.5 Choosing a pH electrode..............................................................16
5.1.6 Care and maintenance .................................................................17
5.2 Redox measurement (ORP) (only available at G 1501) ...............18
5.2.1 Explanation...................................................................................18
5.2.2 redox electrode.............................................................................18

G 1700 series Table of contents
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6 Operation and maintenance.................................................19
6.1 Operating and maintenance notices..............................................19
6.2 Calibration of the pH measurement ..............................................20
6.2.1 General Explanation.....................................................................20
6.2.2 Buffer solutions.............................................................................21
6.3 Automatic pH calibration...............................................................21
6.4 Manual calibration ........................................................................23
6.5 Display the electrode assessment of active calibration .................24
6.6 Battery..........................................................................................25
6.6.1 Battery indicator............................................................................25
6.6.2 Changing battery..........................................................................25
7 Error and system messages.................................................27
8 Technical data .......................................................................29
9 Disposal.................................................................................31
10 Service ...................................................................................31
10.1 Manufacturer................................................................................31
11 Accessories...........................................................................32

1 | About this documentation G 1500 series
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1 About this documentation
1.1 Foreword
_
Read this document carefully and familiarise yourself with the operation of the device
before you use it.
Keep this document ready to hand and in the immediate vicinity of the device so that it
is available to the personnel/user for reference at all times in case of doubt.
The user must have carefully read and understood the operating manual before
beginning any work.
1.2 Legal notices
The liability and warranty of the manufacturer for damages and consequential
damages are voided with misuse, disregarding this document, disregarding safety
notices, assignment of inadequately qualified technical personnel and arbitrary
modifications of the device.
This document is entrusted to the recipient for personal use only. Any impermissible
transfer, duplication, translation into other languages or excerpts from this operating
manual are prohibited.
The manufacturer assumes no liability for print errors.
1.3 Further information
_
Software version of the device:
–V1.2 or later
For the exact product name, refer to the type plate on the rear side of the device.
_
NOTE
For information about the software version, press and hold the ON button to switch on
the device for longer than 5 seconds. The series is shown in the main display and the
software version of the device is shown in the secondary display.

G 1500 series 2 | Safety
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2 Safety
2.1 Explanation of safety symbols
_
DANGER
This symbol warns of imminent danger, which can result in death, severe bodily injury,
or severe property damage in case of non-observance.
_
DANGER
This symbol indicates danger for living tissue as well as a variety of materials, which
can be damaged or destroyed when coming into contact with this chemical. Caustic
effect, protective equipment required!
_
CAUTION
This symbol warns of potential dangers or harmful situations, which can cause damage
to the device or to the environment in case of non-observance.
_
NOTE
This symbol indicates processes, which can have a direct influence on operation or
can trigger an unforeseen reaction in case of non-observance.
2.2 Foreseeable misuse
_
The fault-free function and operational safety of the device can only be guaranteed if
applicable safety precautions and the device-specific safety instructions for this docu-
ment are observed.
If these notices are disregarded, personal injury or death, as well as property damage
can occur.
_
DANGER
Incorrect area of application!
In order to prevent erratic behaviour of the device, personal injury and property dam-
age, the device must be used exclusively as described in the chapter Description in the
operating manual.
–Do not use in safety / Emergency Stop devices!
–The device is not suitable for use in explosion-prone areas!
–The device must not be used for diagnostic or other medical purposes on pa-
tients!

2 | Safety G 1500 series
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–The device is not intended to come into direct contact with food. For measure-
ment in foods, samples must be taken and discarded after the measurement!
–Not suitable for use with requirements on functional safety, e.g. SIL!
2.3 Safety instructions
_
DANGER
Danger of breaking the electrodes!
All electrodes contain glass parts that can cause injuries when broken. There is an
elevated risk of injury in connection with measurements in foods.
–Inspect the electrode before and after the measurement!
–Always measures in samples for measurements in foods. Discard these samples
after the measurement!
_
CAUTION
Empty batteries and batteries of inferior quality can leak more easily, which can
destroy the device. Please also observe the instructions in the chapter “Operation and
maintenance”.
NOTE
This device does not belong in children's hands!
2.4 Intended use
_
_
G 1500 The device is designed for measuring the pH value in water and aqueous
media by means of suitable electrodes.
G 1501 The device is designed for measuring the pH value and Redox by means of
suitable electrodes in water an aqueous media. Temperature compensa-
tion takes place automatically with a connected temperature sensor.
Application examples for this are, for example, drinking water, waste water, surface
water, swimming pools, fish breeding and process chemistry.

G 1500 series 3 | The device at a glance
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2.5 Qualified personnel
For commissioning, operation and maintenance, the relevant personnel must have
adequate knowledge of the measuring process and the significance of the measure-
ments. The instructions in this document must be understood, observed and followed.
In order to avoid any risks arising from interpretation of the measurements in the
concrete application, the user must have additional expertise. The user is solely liable
for damages/danger resulting from misinterpretation due to inadequate expertise.
3 The device at a glance
LCD Display
Front view
Top view G 1500
Top view G 1501
3.1 Display elements
_
Display
_
Battery indicator
Evaluation of the battery status
_
Unit display
Display of units or type of mode, min/max/hold
_
Main display
Measurement of the current pH value or value for
min/max/hold
_
Auxiliary display
Corresponding temperature for the displayed pH
value with unit. Measured temperatures are dis-
played with a decimal place, adjusted without.
_
Bar graph
Progress for calibration and visualisation of the
electrode evaluation

3 | The device at a glance G 1500 series
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3.2 Connections
BNC connection
Connection for pH electrode
(Un/locking with rotating ring on the cable plug)
2x 4mm banana
Connection for temperature sensor or reference
electrode (only available at G 1501)
CAUTION
Ensuring water tightness!
The device guarantees protection from spray water, rain or accidental immersion in
water. This protection for the plug connector is only guaranteed when plugged in.
Moisture or contaminants on the contacts can result in incorrect measurement results.
–Protect contacts from soiling and moisture!
–Dry off damp plug connectors as quickly as possible!
NOTE
The temperature measurement can be influenced by conductive liquids on the banana
sockets. We recommend always keeping the connections dry.

G 1500 series 3 | The device at a glance
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3.3 Operating elements
_
On / Off button
Press briefly
Switch on the device
Activate / deactivate lighting
Long press
Switch off the device
Reject changes in a menu
_
Up / Down button
Press briefly
Display of the min/max value
Change value of the selected parameter
Long press
Reset the min/max value of the current measure-
ment
Both simultaneously
Rotate display, overhead display
_
Function button
Press briefly
Freeze measurement (Hold)
Call up next parameter
Long press, 2s
Start menu “configuration”, (ONF appears in the
display
Long press, 4s
Start automatic calibration, (AL appears in the
display
Operating status device is in measured value display
device is in a menu

4 | Operation G 1500 series
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_
_
4 Operation
4.1 Opening the configuration menu
1. Press the Function key for 2 seconds to open the Configuration menu.
2. (ONF appears in the display. Release the Function key.
_
Parameter
Values
Meaning
_SET.T
Setting the temperature
G 1500 :
-5 .. 105
Medium temperature in °C (at °F: 23 .. 221 °F)
G 1501 *:
-5 .. 105
Medium temperature in °C (at °F: 23 .. 221 °F)
* Parameter is only available without a temperature
sensor connected
_PK.OF
Setting the zero point
Current meas-
urement
Setting of the zero point for calibration of the pH
measurement.
If a calibration cannot be carried out, continue with
the function key
_PK.SL
Setting the gradient
Current meas-
urement
Setting of the gradient for calibration of the pH
measurement.
If a calibration cannot be carried out, continue with
the function key
__INP
Measuring unit (only at G 1501)
PK
pH measurement
0RP mV
Redox in mV, relative to silver / silver chloride -
electrode
0RP mVH
Redox in mVH, relative to hydrogen electrode

G 1500 series 4 | Operation
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UN,T
Display unit temperature
°(
Temperature display in °C
°F
Temperature display in °F
__AL.
Alarm (only at G 1501)
OFF
No alarm active
ON
Alarm via text insertion, acoustic signal and flashing
of the background lighting
BEEP
Alarm via text insertion and acoustic signal
L,TE
Alarm via text insertion and flashing of the back-
ground lighting
_AL.LO
Min. alarm limit (only available if AL <> off)
_PX
0.00 .. AL.X,
a min. alert is triggered if the value falls below this
value.
mV
-1500.. AL.X,
mVH
-1293 .. AL.X,
_AL.XI
Max. alarm limit (only available if AL <> off)
_PX
AL.LO .. 14.00
If the value is exceeded, a max. alarm is triggered.
mV
AL.LO .. 1500
mVH
AL.LO .. 1707
POFF
Shut-off time
OFF
No automatic shut-off
15, 30, 60, 120, 240
Automatic shut-off after a selected time in minutes,
during which no buttons have been pressed

4 | Operation G 1500 series
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L,TE
Backlight
OFF
Backlight deactivated
15, 30, 60, 120, 240
Automatic shut-off of the backlight after a selected
time in seconds, during which no buttons have
been pressed
ON
No automatic shut off of the backlight
IN,T
Factory settings
NO
Use current configuration
YES
Reset device to factory settings.
After confirming with the function-button, the display
shows: IN,T DONE
_

G 1500 series 4 | Operation
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4.2 Adjustment of the measuring input (only available at G 1501)
The temperature input can be adjusted with the zero point correction and the gradient
correction. If an adjustment is made, you change the pre-adjusted factory settings.
This is signalled with the display text T.OF or T.SL when switching on.
1. Switch the device off.
2. Hold the down button and press the On/Off button briefly to switch on the device
and open the Adjustment menu.
3. The display shows the first parameter. Release the down button.
Parameter
Values
Meaning
_T.OF
Zero point correction
0.00
No zero point correction
-5.00 … 5.00
Zero point correction in °C. (at °F -9.00 .. 9.00)
T.SL
Gradient correction of the temperature
0.00
No gradient correction of the temperature
-5.00 … 5.00
Gradient correction in %
Formula used by device:
Temperature = °C: Display = (measured value - T.OF) * (1 + T.SL / 100)
Temperature = °F: Display = (meas. value - 32 °F - T.OF) * (1 + T.SL / 100) + 32 °F
Adjustment example:
Temperature unit= °C, the adjustment is carried out in 2 separate steps at 0 °C (e.g. ice
water) and at a reference temperature (e.g. clinical thermometer with water bath 37 °C).- First
set the values of t.oF and t.SL in the adjustment menu to 0
Zero point: - Set the temperature probe to 0 °C and let it adjust.
- Start the adjustment menu and enter the display value at 0 °C for t.oF
- After leaving the menu, the device should now display 0.0 °C.
Slope: - Set the temperature sensor to the reference temperature and let it adjust.
- Calculate slope correction:    󰇡
  󰇢  
- Start adjustment menu and enter the calculated value at t.SL
- Exit menu, the device should now display the reference temperature.

5 | Measurement Basics G 1500 series
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5 Measurement Basics
NOTE
To start the measurement, remove the protection cap from the electrode and rinse the
shaft and the membrane with distilled water.
5.1 pH measurement
5.1.1 Explanation
The pH value describes the acidic or alkaline behaviour of an aqueous solution.
A pH value below 7 is acidic, a value above 7 is alkaline. A pH value of 7 is neutral.
The pH measurement is very precise, but also sensitive. The measured signals are
very weak and high-ohmic. This is the case, in particularly in low-ion media.
_
NOTE
In order to detect the pH value of a solution, it should always be recorded together with
the measurement temperature, because most liquids change their pH value with the
temperature.
The following must be observed:
–avoid interference, electrostatic charges, etc.
–keep plug contacts clean and dry
–prevent electrodes, which do not have any special waterproof versions from ex-
tended immersion above the shaft
–calibrate electrodes sufficiently often. The can range from every hour to several
weeks, depending on the electrode and the application
–Use a suitable electrode

G 1500 series 5 | Measurement Basics
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5.1.2 pH electrode
Normally, so-called pH single-rod measuring chains are used. They include all neces-
sary components that are integrated in an electrode.
There are also electrodes with integrated temperature sensors.
Design of a pH electrode:
1. Coaxial cable
2. Reference electrode
3. Measuring electrode
4. Refill opening
5. Electrolyte
6. Internal buffer
7. Diaphragm
8. Glass membrane / source layer
The diaphragm, which establishes a connection between the electrolyte and the liquid
to be measured, can be designed in different ways.
Clogging or soiling of the diaphragm is a frequent cause of a malfunctioning or slug-
gish electrode.
Always handle the glass membrane with extreme care. The so-called source layer
forms there. This is crucial for the measurement and must always be kept moist.

5 | Measurement Basics G 1500 series
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5.1.3 Further information
A pH electrode is a wear part. If the signal is very slow or the required values are no
longer observed after careful cleaning and possible regeneration, the electrode must
be replaced.
When using the electrodes, be aware that various substances in aqueous solutions
can corrode glass and that chemicals can produce a chemical reaction with the KCl
solution in the electrode, which can result in blockage of the diaphragm.
•In solutions that contain proteins, such as for measurements in medical and bio-
logical applications, KCl can cause denaturation of the protein.
•Coagulated paints
•Solutions that contain high concentrations of silver ions
Substances that accumulate on the glass membrane or the diaphragm affect the
measurement and must be removed regularly. This can be achieved for example with
automatic cleaning systems.
5.1.4 Service life
The service life of electrodes is normally at least 8 to 10 months.
When cared for properly, this can usually increase to more than 2 years. The actual life
will vary depending on the particular application.
5.1.5 Choosing a pH electrode
For most applications, the GE 114 or the GE 125 or GE 135 can be used.
However, some areas of application require special electrodes, please refer to our
catalog.
Short info's on electrodes supplied in sets:
•GE 114 is a universally applicable, durable and low-maintenance gel electrode
with Pellon diaphragm.
It can be used for measurements in drinking water, swimming pools,
aquaria and slightly contaminated waste water.
•GE 125 is a waterproof, universally applicable, durable and low-maintenance
gel electrode with ceramic diaphragm and integrated Pt1000 tempera-
ture sensor.
It can be immersed above the shaft for an extended time.
•GE 135 is a waterproof, universally applicable, durable and low-maintenance
gel electrode with ceramic diaphragm and integrated Pt1000 tempera-
ture sensor.
It can be immersed above the shaft for an extended time.

G 1500 series 5 | Measurement Basics
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5.1.6 Care and maintenance
NOTE
The glass tip of the electrode with the sensitive hydrated layer must be kept moist, e.g.
with 3 mol/l KCl solution in the storage cap. Accidental drying-out of the electrode can
be reversed under certain circumstances after storage for several hours in 3 mol/l KCl,
but this cannot be guaranteed.
NOTE
The GAK 1400 working and calibration set includes all necessary products for calibra-
tion, care and maintenance of the electrode. Normal cleaning takes place with the GRL
100 pepsin cleaning solution into which the electrode is immersed for 5 minutes before
being rinsed off with clean water.
NOTE
Crystallisation of the 3 mol/l KCL solution is unavoidable. Crystallised potassium
chloride on the protective cap and shaft can easily be removed with a fingernail or
cloth and is therefore not a defect or grounds for complaint.
Dirty electrodes must be cleaned. The suitable cleaning agents for the pH glass mem-
brane are listed in the table below:
Impurities
Cleaners
General residue
Mild detergent
Inorganic coatings
Commercially available liquid glass clean-
ers
Metal compounds
1 mol/l HCl solution or GRL 100
Oil and grease
Special cleaner or solvent
Biological coatings with protein
1% pepsin enzyme in 0.1 molar GRL 100
HCl solution
Resin lignins
Acetone
Extremely resistant residues
Hydrogen peroxide or sodium hypochlo-
ride
The material of the pH electrode must always be protected. Plastic shafts must not be
cleaned in solvents, etc.
If in doubt, contact the manufacturer to inquire about suitable cleaners for the existing
electrode. This is also important in the case of aggressive substances or other sub-
stances that are not primarily water-based!
.

5 | Measurement Basics G 1500 series
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5.2 Redox measurement (ORP) (only available at G 1501)
5.2.1 Explanation
The Redox potential 0RP specifies the extent to which the measured sample has an
oxidising or reducing effect relative to the standard hydrogen electrode.
This potential is frequently used in swimming pools as a measured variable for the
disinfecting effect of a chlorination. For aquaria, the Redox value is also an important
parameter, because fish can only live within a specific Redox range. The measurement
is also important in drinking water preparation, waste water monitoring and in industrial
applications.
Measurement takes place relative to the widespread silver/silver-chloride system with
3 mol/l KCL electrolyte. The measurements can be read directly (mV setting) or auto-
matically with the mVH measuring unit setting and temperature compensation is
calculated based on the standard hydrogen electrode reference system.
Calibration comparable to the pH measurement does not take place for the Redox
measurement. However, the suitability of the electrodes can always be checked with
Redox testing solutions, such as GRP 100.
5.2.2 redox electrode
NOTE
Special redox electrodes (e.g. GR 105) are used for the redox measurement.
The pH electrodes cannot be used for redox measurement!

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6 Operation and maintenance
6.1 Operating and maintenance notices
_
NOTE
The device and electrode must be handled with care and used in accordance with the
technical data. Do not throw or strike.
_
NOTE
Plugs and sockets must be protected from soiling.
_
NOTE
If the device is stored at a temperature above 50 °C, or is not used for an extended
period of time, the batteries must be removed. Leaks from the batteries are avoided as
a result.
_
NOTE
The electrode should be stored in dry rooms at a temperature between 10 °C and 30
°C. If the storage temperature range is exceeded or undercut, the electrode can be
destroyed. It should always be stored wet in 3 mol/l KCl. Extended storage in distilled
or deionised water will result in depletion of the reference electrolytes.
_
NOTE
The pH electrode included in the scope of supply should be arranged vertically up-
wards with the connecting cable. A slight angle of inclination does not impair the
measurement.

6 | Operation and maintenance G 1500 series
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6.2 Calibration of the pH measurement
6.2.1 General Explanation
The following steps describe how to calibrate the device.
To achieve a precise measurement, observe the following points.
NOTE
If possible, the calibration range should overlap the measuring range.
To achieve this, it is recommended to use buffer solutions for measurements as
follows:
–below pH 7 uses Puffer pH 7,0 and pH 4,0
–above pH 7 uses Puffer pH 7,0 and pH 10,0.
NOTE
Calibrations are only possible in a temperature range from 0 °C to 60 °C!
We recommend performing calibration at temperatures between 10 °C and 40 °C.
NOTE
Calibration should be conducted at the same temperature used for the measurement in
the medium. To equalize the temperatures of the buffer solutions and electrode, they
should be stored together for a while in a place that is protected against draught
NOTE
If a temperature sensor is not connected, measure the temperature of the buffer
solution with a thermometer.
The exact value of the buffer solution is temperature dependent and can be deter-
mined based on the tables provided.
NOTE
Always use fresh buffer solutions!