GREISINGER GMH 5530 User manual

WEEE-Reg.-Nr. DE 93889386
Operating Manual
Handheld pH / ORP-Meter
water-proof
Please carefully read these instructions before use!
Please consider the safety instructions!
Please keep for future reference!
PCE Instruments France EURL
76, Rue de la Plaine des Bouchers
67100 Strasbourg
France
Tel: [phone]
Fax: [phone]
[e-mail]
www.pce-instruments.com/fre nch

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Index
1GENERAL NOTE......................................................................................................................................................3
2SAFETY ......................................................................................................................................................................3
2.1 INTENDED USE ......................................................................................................................................................3
2.2 SAFETY SIGNS AND SYMBOLS................................................................................................................................3
2.3 SAFETY GUIDELINES..............................................................................................................................................3
3PRODUCT SPECIFICATION..................................................................................................................................4
3.1 SCOPE OF SUPPLY ..................................................................................................................................................4
3.2 OPERATION AND MAINTENANCE ADVICE..............................................................................................................4
4HANDLING................................................................................................................................................................5
4.1 DISPLAY ELEMENTS...............................................................................................................................................5
4.2 PUSHBUTTONS.......................................................................................................................................................5
4.3 CONNECTIONS .......................................................................................................................................................6
4.4 POP-UP CLIP...........................................................................................................................................................6
5START OPERATION................................................................................................................................................7
6PRINCIPLES OF THE MEASUREMENTS...........................................................................................................7
6.1 PHMEASUREMENT ................................................................................................................................................7
6.2 ORP MEASUREMENT .............................................................................................................................................8
6.3 RHMEASUREMENT................................................................................................................................................8
6.3.1 Manual input of pH value (and temperature) ................................................................................................8
6.3.2 Automatic input of pH value from preceding pH measurement.....................................................................8
6.4 PHELECTRODE ......................................................................................................................................................9
6.4.1 Design ............................................................................................................................................................9
6.4.2 Further Information.......................................................................................................................................9
6.4.3 pH electrode suggestions ...............................................................................................................................9
6.5 CALIBRATION OF PHMEASUREMENT..................................................................................................................10
6.5.1 How to prepare calibration buffers of standard GPH series (capsules) .....................................................10
6.5.2 Automatic temperature compensation during calibration ...........................................................................10
6.5.3 How to carry out calibration .......................................................................................................................10
7CONFIGURATION .................................................................................................................................................12
8OUTPUT / EXTERNAL SUPPLY..........................................................................................................................13
9INPUT ADJUSTMENT...........................................................................................................................................14
10 GLP........................................................................................................................................................................14
10.1 CALIBRATION INTERVAL (C.INT).....................................................................................................................14
10.2 CALIBRATION STORAGE (READ CAL).............................................................................................................14
11 REAL TIME CLOCK (“CLOC”) .......................................................................................................................15
12 ACCURACY CHECK / ADJUSTMENT SERVICE ........................................................................................15
13 REPLACING BATTERIES.................................................................................................................................15
14 ERROR AND SYSTEM MESSAGES................................................................................................................16
15 RESHIPMENT AND DISPOSAL.......................................................................................................................16
15.1 RESHIPMENT ....................................................................................................................................................16
15.2 DISPOSAL INSTRUCTIONS.................................................................................................................................16
16 SPECIFICATION.................................................................................................................................................17
17 NOTE A: TEMPERATURE INFLUENCE ON PH BUFFER SOLUTIONS.................................................19
18 NOTE B: PREPARATION OF PH BUFFER SOLUTIONS............................................................................19

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1 General Note
Read this document carefully and get used to the operation of the device before you use it. Keep this
document within easy reach near the device for consulting in case of doubt.
Mounting, start-up, operating, maintenance and removing from operation must be done by qualified, specially
trained staff that have carefully read and understood this manual before starting any work.
The manufacturer will assume no liability or warranty in case of usage for other purpose than the intended
one, ignoring this manual, operating by unqualified staff as well as unauthorized modifications to the device.
The manufacturer is not liable for any costs or damages incurred at the user or third parties because of the
usage or application of this device, in particular in case of improper use of the device, misuse or malfunction
of the connection or of the device.
The manufacturer is not liable for misprints.
2 Safety
2.1 Intended Use
The device is designed for measuring pH and ORP potentials with the help of adequate electrodes. The
electrode is connected via BNC-socket.
Please note: Different electrode types are needed for pH and ORP measurements.
It is possible to connect a temperature probe (Pt1000 or NTC 10k, banana plugs) additionally. This enables
an automatic temperature compensation (ATC) for pH, rH and mVH measurements and displaying the
media’s temperature.
The safety requirements (see below) have to be observed.
The device must be used only according to its intended purpose and under suitable conditions.
Use the device carefully and according to its technical data (do not throw it, strike it, …)
Protect the device from dirt.
2.2 Safety signs and symbols
Warnings are labeled in this document with the followings signs:
DANGER
Caution! This symbol warns of imminent danger, death, serious injuries
and significant damage to property at non-observance.

Attention! This symbol warns of possible dangers or dangerous
situations which can provoke damage to the device or environment at
non-observance.
Note! This symbol point out processes which can indirectly influence
operation or provoke unforeseen reactions at non-observance.
2.3 Safety guidelines
This device has been designed and tested in accordance with the safety regulations for electronic devices.
However, its trouble-free operation and reliability cannot be guaranteed unless the standard safety measures
and special safety advises given in this manual will be adhered to when using the device.
1. Trouble-free operation and reliability of the device can only be guaranteed if the device is not subjected to
any other climatic conditions than those stated under "Specification".
If the device is transported from a cold to a warm environment condensation may cause in a failure of the
function. In such a case make sure the device temperature has adjusted to the ambient temperature
before trying a new start-up.

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
2. If there is a risk whatsoever involved in running it, the device has to be switched off
immediately and to be marked accordingly to avoid re-starting.
Operator safety may be a risk if:
- there is visible damage to the device
- the device is not working as specified
- the device has been stored under unsuitable conditions for a longer time.
In case of doubt, please return device to manufacturer for repair or maintenance.
3. When connecting the device to other devices the connection has to be designed most thoroughly as
internal connections in third-party devices (e.g. connection GND with protective earth) may lead to
undesired voltage potentials that can lead to malfunctions or destroying of the GMH 5530 and the
connected devices.
This device must not be run with a defective or damaged power supply unit.
Danger to life due to electrical shock!
4. Do not use these products as safety or emergency stop devices 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.
5. This device must not be used at potentially explosive areas! The usage of this device at
potentially explosive areas increases danger of deflagration, explosion or fire due to
sparking.
3 Product Specification
3.1 Scope of supply
The scope of supply includes:
GMH 5530 with 2 AAA batteries
Operation manual
Short form manual
3.2 Operation and maintenance advice
1. Battery operation
If ‘bAt’ is shown in the lower display the battery has been used up and needs to be replaced. However, the
device will operate correctly for a certain time. If ‘bAt’ is shown in the upper display the voltage is too low to
operate the device; the battery has been completely used up. Battery change: p.r.t. chapter 13.
The battery has to be taken out, when storing device above 50 °C.
We recommend taking out battery if device is not used for a longer period of time.
After recommissioning the real-time clock has to be set again.
2. Treat device and sensor carefully. Use only in accordance with above specification. (do not throw, hit
against etc.). Protect plug and socket from soiling
3. USB or mains operation:
When connecting a mains cable or USB interface cable, please take care to connect only allowed
components.
The output voltage of a connected power supply unit has to be between 4.5 and 5.5 V DC.
Don’t apply overvoltage!
We recommend operation with interface cable USB 5100. Then device is supplied by the USB interface of
the connected PC or USB power supply adapter.
4. Display values for damaged electrode cable or if no pH or ORP electrode has been connected:
If no electrode is connected or the connection cable is damaged the display will nevertheless show mV,
pH or rH values. Please note that these values can never be correct measuring results!
DANGER
DANGER
DANGER
DANGER

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4 Handling
4.1 Display elements
1
Main display:pH value,
ORP value (mV, mVH),
rH value
2
Secondary display: temperature value
3
Arrows to selected measuring unit
4
Rating of electrode state or battery status
5
Display elements to show minimum / maximum /
memorized measuring value
6
atc arrow: indicates if temperature sensor is
connected and therefore automatic
temperature compensation is active
(only for ‘pH’, ‘mVH’ and ‘rH’ measuring
mode)
7
stab arrow: indicates stable measuring value
8
cal arrow: indicates a running calibration
(at operation mode ‘pH’).
9
No function
4.2 Pushbuttons
On / off key, backlight
press shortly: activate backlight or switch on instrument
press longer: switch off instrument
t / menu:
press shortly: at ‘pH’, ‘rH’ and ‘mVH’:
manual temperature input (if no
temperature probe is connected)
additionally at ‘rH’:
manual input of pH value
press for 2 sec. (menu): invoke configuration menu
min / max:
press shortly: min. or max. value is displayed
press for 2 sec:the corresponding value is deleted
cal: only at mode ‘pH’:
press shortly: display of electrode state rating
(electrode symbol +bar graph display)
press for 2 sec: start pH calibration
store / enter:
Measuring: hold and save current measuring value
(‘HLD’ is displayed)
(Set/Menu: confirm settings, return to measuring)

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4.3 Connections
Universal output: interface, supply (p.r.t. chapter 8
“Output / External Supply”)
BNC socket: connection of pH or ORP electrode; with
adequate cable waterproof IP65!
Banana sockets:
Connection of Pt1000 or NTC10k temperature probe
Electrodes with integrated temperature sensor:
the banana plug is connected from outside
Separately lead through reference electrode:
it is connected from inside
4.4 Pop-up clip
Handling:
• Pull at label “open” in order to swing open the pop-up clip.
• Pull at label “open” again to swing open the pop-up clip further.
Pop-up clip closed
Pop-up clip at position 90°
Pop-up clip at position 180°
Function:
•The device with a closed pop-up clip can be plainly laid onto a table or attached to a belt, etc.
•The device with pop-up clip at position 90° can be set up on a table, etc.
•The device with pop-up clip at position 180° can be suspended from a screw or the magnetic holder
GMH 1300.
Device attached to a belt
Device set up on a table
Device suspended from
magnetic holder
GMH 1300

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5 Start Operation
Connect electrodes, turn device on via key.
After segment test the device displays some configuration:
if zero point or slope correction is active
(p.r.t. chapter 7 “Configuration” and 9 “Input adjustment”)
Remove protective cap from electrode. (Attention: Cap should contain KCL 3 M or storage solution)
After that the device is ready for measuring.
6 Principles of the measurements
6.1 pH measurement
The pH value specifies the acid or alkaline behavior of aqueous solutions.
Solutions with a pH values below 7 are acid (the more below 7 the more acid), values higher than 7 mean
alkaline and pH = 7 means neutral.
The pH value is the negative common logarithm of the hydrogen ion activity (this is often approximately
equal to the concentration of dissolved hydronium ions):
   log 󰇡󰇛H󰇜 · 󰇛H󰇜
mol l
⁄ 󰇢 with 󰇛H󰇜: concentration of dissolved hydronium ions in mol/l
󰇛H󰇜: activity coefficient (normally lower than 1)
The abbreviation “pH” stands for pondus Hydrogenii (Latin pondus: “weight“; Hydrogenium: “hydrogen“).
pH values should always be measured and saved together with the temperature of the solution:
i.e. pH 5.87; 22.8 °C.
Reason: The pH values of most liquids are depending on temperature.
The pH measurement is highly precise but also very sensitive. The measured signals are very weak (high
resistance), especially if measured in low-ion media. Therefore it is very important that:
- disturbances (electrostatic charge, etc.) are prevented.
- a stable value is reached by slow stirring.
- contact plugs are kept clean and dry.
- the electrode shaft is not submersed for a longer period (exception: special water-proof types).
- the electrode is calibrated often enough (see below). The needed calibration frequency depends on
the used electrode and application and varies between once every hour to once in several weeks.
- A suitable electrode is chosen. Please refer to chapter 6.4.

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6.2 ORP measurement
The ORP potential (also known as reduction potential or ORP) is a measure of the oxidizing or reducing
potential of the measured media compared to the standard hydrogen electrode.
This potential is often used in swimming pools to rate the disinfectant effect of chlorination. Also for aquarium
keepers the ORP value is an important parameter, because fishes need ORP values within specified
boundaries to live. Drinking water purification, water monitoring and industrial applications are some further
fields where the ORP value is of importance.
The measurement is done with a common silver chloride electrode (reference system with 3-molar
potassium chloride solution). The measured value can be directly displayed (mode mV) or converted to
“reference system: standard hydrogen electrode” and temperature compensated at mode mVH.
There is no calibration comparable with that of the pH measurement. However, the electrode’s capability can
be checked with ORP test solutions (for example GRP 100).
Suitable ORP electrodes: e.g. GE 105 BNC
6.3 rH measurement
The rH value is a calculated value of a pH and an ORP measurement. For example it is used to describe the
anti oxidative effect of food. This is a measure for the ability of food to reduce harmful free radicals.
To measure the rH value of a solution, proceed as follows:
6.3.1 Manual input of pH value (and temperature)
You can set the value for pH and temperature (if no temperature sensor is connected) manually. Press key
shortly and set the temperature value with keys and . Press shortly again and enter the pH
value. Confirm with .
6.3.2 Automatic input of pH value from preceding pH measurement
It is important that the pH and ORP electrodes are in sound condition and that they are cleaned and
dried well before they are inserted to the solution.
First place pH and ORP electrode and temperature probe in the solution and stir carefully.
1. Measuring pH value:
Connect the pH electrode and temperature probe to the GMH 5530.
Then set device to pH measuring mode and calibrate electrode if necessary
(p.r.t. chapter 6.5 “Calibration of pH measurement” and chapter 7 “Configuration”).
Measure the pH value of the solution and store the measured value with .
Do not turn off the device until the tH measurement is finished. If the device is turned off the saved
pH value is deleted and has to be set manually for the following rH measurement.
2. Get the rH value:
Connect ORP electrode and set device to rH measuring mode. The main display shows the
calculated rH value of the solution, the secondary display shows the prior measured pH value and
the temperature alternatingly.

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
6.4 pH electrode
6.4.1 Design
In most cases so-called combination electrodes are used. That means that
all needed elements are integrated in a single electrode (including reference
electrode).
Sometimes even a temperature sensor is integrated.
The picture on the right shows an electrode without temperature sensor.
There are several design types for the diaphragm, but generally said it is the
connection between electrolyte and the measured solution. A blockade or
soiling of the diaphragm is often the reason for the electrodes idleness and
erratic behavior.
The glass membrane has to be treated with care. The hydrated gel layer
forms on the surface of the glass membrane, which is of highest importance
for the measurement. The electrode has to be kept wet to preserve the
hydrated gel layer (see below).
6.4.2 Further Information
pH-electrodes are wear parts which need to be replaced, if the values
required can no longer be kept even after thorough cleaning and recovery or
the electrode signal gets to slow. The actual lifetime of an electrode depends
highly on the chemical or mechanical stress it is subjected to. Please take
into account that there are several materials that are in aqueous solutions aggressive to glass; other
chemicals may react with the KCl-solution in the electrode thus causing blockades in the diaphragm.
Examples:
- with solutions containing protein, like they are used on the medical and biological sector, KCI may result in
the denaturation of the protein.
- coagulated varnish
- solutions with a relatively high concentration of silver ions
Any material depositing on the measuring membrane or the diaphragm will influence the measurements and
have to be removed at regular intervals. This can be done by means of automatic cleaning equipment.
Electrodes have to be stored in a way that they are kept wet. An adequate solution is to store
them with suitable protective cap filled with KCl 3 M. Please consider also the instructions in
the electrodes manual!
6.4.3 pH electrode suggestions
Different applications require different electrodes
1. Measurements in low-ion media (rain water, aquarium water, VE-waters)
GE 106 BNC (as of 25 µS/cm)
2. Sea water aquariums
Standard pH electrodes with 3mol KCl (GE 100 BNC, GE 117)
3. Swimming pools
Standard pH electrodes with 3mol KCl (GE 100 BNC, GE 117)
4. Soil checks
Glass electrodes with several diaphragms (GE 101 BNC); use insertion mandrel!
5. Electroplating, some paints and lacquers
Glass electrode GE 151 BNC
6. Cheese, fruit, meat
Insertion electrode (GE 101 BNC or GE 120 BNC).
When taking measurements in cheese, milk and other high-protein products use special cleaning agent to
clean electrode. (pepsin solution - GRL 100).
Standard cleaning: apply 0.1 molar HCl-solution for at least 5 minutes or protein cleaning agent.
The average service life of an electrode is 8 to 10 months but may be increased to 2 years if electrode is well
maintained and treated carefully. We regret not being able to give a more detailed information as this is
highly dependent on the individual case of application.

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6.5 Calibration of pH measurement
The electrode data of pH electrodes are subject to fluctuation due to ageing and manufacturing tolerances.
Therefore it is necessary to check the calibration with buffer solutions before measurements take place. If
deviations are too large, a recalibration is necessary. See also: Chapter 10 GLP
Buffer solutions are liquids with an accurate pH-value. The following buffers can be used for calibration:
- Technical buffer series PHL (ready to use, pH 4.01, pH 7.00 und pH 10.01)
- Standard series GPH (buffer capsules to be mixed with water pH 4.01, pH 7.00 and pH 10.01)
- DIN series CAL dIn (pH 1.68 (A), pH 4.01 (C), pH 6.87 (D), pH 9.18(F) und pH 12.45(G))
- Arbitrary buffer CAL Edit (neutral buffer ranging from 6.5 ... 7.5pH)
Service life of a buffer solution is limited and will be further reduced unless the electrodes are
properly rinsed and dried when changing over the solutions. This may even result in incorrect
calibration! We recommend to use new buffer solution for calibration, as far as possible, and to
rinse with deionized or distilled water.
6.5.1 How to prepare calibration buffers of standard GPH series (capsules)
See Notes B.
6.5.2 Automatic temperature compensation during calibration
Both the signal of the pH-electrode and the pH-buffer are depending on temperature. If a temperature probe
is connected, the temperature influence of the electrode is compensated automatically during measuring as
well as during calibration. Otherwise enter actual buffer temperature as accurate as possible (see below).
When working with the standard or DIN-buffer series, the influences of buffer temperature are also
compensated. If buffers are entered manually, make sure to enter the pH-values of the buffers at the relevant
temperature to ensure optimum calibration of the device.
6.5.3 How to carry out calibration
Please note: the calibration can only carried out at a temperature range of 0 - 60°C !
If you have not yet done so set device to measuring mode ’pH’. Make sure that either the 1-, 2- or 3- point
calibration (whichever is required) and desired buffer series (PHL, GPH, dIn or Edit) the has been activated
(further information in chapter 7 “Configuration”).
Carefully remove electrode safety cap (Attention! Contains 3 mol KCl!).
Rinse electrode with distilled water and dry it carefully.
How to start calibration: press key for 2 seconds.
The display will prompt you to measure the first calibration solution.
You can abort calibration at any time by pressing key. In such a case the last calibration before this one
remains valid.
1. Calibration point 1: ‘Pt. 1’
*1)
Place electrode and temperature probe
(if any) in the neutral solution stirring
gently.
(For 1-point calibration: solutions with
arbitrary pH value (e.g. pH 4) can be uses)
As soon as the measured pH value got
stable the next calibration step will be
displayed.
No temperature sensor:
manual input of
temperature of buffer 1
Use or to enter the temperature of
the buffer solution.
Use to confirm the value; the next
calibration step is displayed.
If 1-point calibration is chosen the calibration is already done at this point, the bar graph display on the left
shows the electrode’s state rating.
2. Rinse electrode in distilled or deionized water, dry electrode

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3. Calibration point 2: ‘Pt. 2’ (only for 2- or 3- point calibration)
*1)
Place electrode and temperature probe
(if any) in the second buffer solution (e.g.
for standard series this is: pH 4.0 or pH
10.0) and stir gently.
As soon as the measured pH value got
stable the next calibration step will be
displayed.
No temperature sensor:
manual input of
temperature of buffer 2
Use or to enter the temperature of
the buffer solution.
Use to confirm the value; the next
calibration step is displayed.
If 2-point calibration is chosen the calibration is already done at this point, the bar graph display on the left
shows the electrode’s state rating.
4. Rinse electrode in distilled or deionized water, dry electrode
5. Calibration point 3: ‘Pt. 2’ (only for 3- point calibration)
Please note: both, an alkaline and acid calibration point are needed for a 3-point calibration.
*1)
Place electrode and temperature probe
(if any) in the third buffer solution (e.g. for
standard series this is: pH 10.0) and stir
gently.
As soon as the measured pH value got
stable the next calibration step will be
displayed.
No temperature sensor:
manual input of
temperature of buffer 3
Use or to enter the temperature of
the buffer solution.
Use to confirm the value; the next
calibration step is displayed.
Calibration has finished, the bar graph display on the left shows the electrode’s state rating.
*1) In case of manual buffer selection (CAL Edit) use or to enter pH value of the used solution. If
solutions from the standard and DIN series are used their pH value will be automatically detected.
Use to confirm the value; the next calibration step is displayed.
Error messages of pH calibration:
Neutral buffer not permissible
- Electrode defective
- Wrong buffer solution
- Buffer solution defective
Clean electrode and calibrate again, if error occurs
again -> replace electrode
Always use neutral buffer as first solution
(exception: 1 point calibration)
Use new buffer solution
Slope is too low:
- Electrode defective
- Buffer solution defective
Replace electrode
Use new buffer solution
Slope is too high:
- Electrode defective
- Buffer solution defective
Replace electrode
Use new buffer solution
Incorrect calibration temperature
Calibration can only be done at 0…60 °C
Permissible electrodes’ data:
Asymmetry: ±55 mV
Slope: -62 ... -45 mV/pH

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7 Configuration
Some menu points depend on current device settings
To change device settings, press “menu”for 2 seconds. This will activate the configuration menu (main
display: “Set”).
Pressing “menu” changes between the menus points, pressing jumps to the referring parameters,
which can be selected with key .
The parameters can be changed with or .
Pressing “menu” again jumps back to the main configuration menu and saves the settings.
“enter” finishes the configuration and returns to standard measuring operation.
Pressing “menu” and “store” at the same time for more than 2 seconds will reset the device to
factory defaults.
If no key is pressed for more than 2 minutes the configuration will be aborted. All changes will not
be saved!
Menu
Parameter
Value
Description
or
Set Configuration: General configurations
Input: Selection of measured variable
Arrow “rH”
rH value measurement
Arrow “mV”
mV value measurement (REDOX or ORP)
Arrow “mVH”
mV value measurement referring to standard hydrogen system
Arrow “pH”
pH value measurement
Resolution pH: Resolution of ph display
0.1 …0.001
tenth pH … thousandth pH
Calibration: Select number of calibration points
1-Pt
1-point (only offset calibration, slope = -59.2mV/pH)
2-Pt
2- point (neutral + another one)
3-Pt
3- point (neutral + one acid + one alkaline buffer)
Calibration: Select buffer series
GPH
Technical Buffer series: GPH-Capsules (pH7, pH4, pH 10)
PHL
Technical liquid buffer series: PHL (pH7, pH4, pH 10)
dIn
DIN 19266 buffer series pH 1.68(A), pH 4.01(C), pH 6.87(D), pH
9.18(F), pH 12.45(G)
Edit
Arbitrary buffer, manual input
Calibration: Calibration reminder period (factory setting: off)
1 …365
Calibration reminder period (in days)
oFF
No calibration reminder
t-Input: Select temperature input
NTC
NTC 10k
Pt
Pt1000
Unit t: Select temperature unit
°C:
All temperatures in degree Celsius
°F:
All temperatures in degree Fahrenheit
Auto Hold: Auto measuring value identification
on
Auto measuring value identification Auto Hold
oFF
Standard hold function on key press
Auto Power-Off: Select power-off delay
1...120
Power-off delay in minutes.
Device will be automatically switched off as soon as this time has
elapsed if no key is pressed/no interface communication takes place.
oFF
Automatic power-off function deactivated (continuous operation)
Background illumination
oFF:
Illumination deactivated
5 … 120
Turn off illumination after 5… 120s
on:
Illumination always on

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Menu
Parameter
Value
Description
or
Universal Output
oFF
Interface and analog output off -> minimal power consumption
SEr:
Serial interface activated
dAC:
Analog output activated
01,11..91
Base address for serial interface communication
Set Corr: Input adjustment
Zero adjustment / offset of voltage measurement
oFF
No zero adjustment for voltage measurement
-10.0 … 10.0
mV
Offset of voltage measurement in mV
Slope adjustment of voltage measurement
oFF
No slope adjustment for voltage measurement
-5.000 …
5.000 %
Slope correction of voltage measurement in %
Zero adjustment / offset of temperature measurement
oFF
No zero adjustment for temperature measurement
-5.0 … 5.0°C
Offset of temperature measurement in °C
Slope adjustment of temperature measurement
oFF
No slope adjustment for temperature measurement
-5.00 … 5.00%
Slope correction of temperature measurement in %
Set Clock: Settings for real time clock
HH:MM
Clock: set time hours:minutes
YYYY
Year: set year
TT.MM
Date: set date day.month
rEAd CAL: Read calibration data:
p.r.t. chapter 10.2 “Calibration storage (rEAd CAL)”
8 Output / External Supply
The device has a serial output (for interface converter USB 5100). If the output is not needed, it is strongly
recommended to deactivate it (Out oFF) to lower power consumption. This increases battery life time.
If the device is used together with interface adapter USB 5100 the device is supplied from the interface.
Pin assignment:
4: external supply +5V, 50mA
3: GND
2: TxD/RxD (3.3V Logic)
1: not used

Only suitable adaptor cables are
permitted (accessories)!
The device can be connected to a USB interface of a PC by the electrically isolated interface converter
USB 5100 (accessory). The data is transmitted binary-coded and protected against transmission errors by
complex safety mechanism (CRC).
The following standard software packages are available:
GSOFT3050: Operating and evaluation software for the integrated logger function
EBS20M / -60M: 20-/60-channel software for measuring value display
GMHKonfig: Configuration Software (for free on internet)
In case you want to develop your own software we offer a GMH3000-development package including:
a universally applicable Windows functions library ('GMH3x32e.DLL') with documentation, can be used
by all ‘established’ programming languages, suitable for:
Windows XP™, Windows Vista™, Windows 7™
Programming examples Visual Basic™, Delphi 1.0™, Testpoint™ etc.
The device has 2 channels:
- channel 1: actual-value-channel pH, mV or rH and base address
- channel 2: temperature value

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The unit of all transmitter values (including measuring values) is the unit of corresponding
displayed values.
(e.g. temperature is displayed in °C -> temperature value is also transmitted in °C)
9 Input adjustment
The zero point and slope of each measuring inputs can be adjusted with the parameters offset (“OFFS”) and
scale (“SCAL”).
A reasonable adjustment presumes reliable references (e.g. ice water, controlled precision water bath, etc.).
If the inputs are adjusted (i.e. offset and scale are different from default settings) the device will shortly
display “Corr” after turned on.
Default setting for offset and scale are ‘off’ = 0.0, i.e. inputs are not changed.
Zero point correction:
Displayed value = measured value –OFFS
Zero point and slope correction:
Displayed value = (measured value –OFFS) * (1 + SCAL / 100 )
(Displayed value °F = (measured value °F - 32°F - OFFS) * (1 + SCAL / 100 ) )
10 GLP
GLP (Good Laboratory Practice) includes regular check of devices and accessories. For pH measurements it
is highly important to ensure correct pH calibration. The device provides the following functions to help with
this.
The usage of the GLP functions is only reasonable if the electrode is not changed. Although all data is stored
in the device, it refers to the particular electrode.
10.1 Calibration interval (C.Int)
You can input the interval after which the device reminds you to recalibrate.
The interval times should be chosen according to the application and the stability of the electrode.
“CAL” flashes on the display as soon as the interval has expired.
10.2 Calibration storage (rEAd CAL)
The last calibration is stored with results and date and can be read out.
Display calibration data:
Historical calibration data can be comfortably read out via PC software GMHKonfig or displayed directly at
the device:
Press for 2 seconds
The display will show:
or (configuration level)
Press several times until this is
displayed:
read cal. = “read calibration data”
Press shortly: switch between
- U.ASY = asymmetry voltage in mV
- SL. 1 = slope acid in mV/pH *1)
- SL. 2 = slope alkaline in mV/pH *1)
- date+time display of data set
Additionally the bar graph display shows the electrode state rating of the
corresponding calibration.
Quit calibration data sets display
*1) 1-point calibration: slope acid = slope alkaline = 59.16mV/pH is assumed
2-point calibration: slope acid = slope alkaline = determined slope
3-point calibration: slope acid and slope alkaline are determined separately

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11 Real Time Clock (“CLOC”)
The real time clock is used for chronological assignment of the calibration points. Please check the settings
when necessary.
12 Accuracy Check / Adjustment Service
You can send the device to the manufacturer for adjustment and inspection.
Calibration certificate - DKD certificate - official certifications:
If the measuring instrument is supposed to receive a calibration certificate, it has to be sent to the
manufacturer (declare test levels, e.g. -20; 0°C; 70°C).
If the device is certificated together with a suitable sensor very high overall accuracies are possible.
Basic settings can only be checked and –if necessary –corrected by the manufacturer.
A calibration protocol is enclosed to the device ex works. This documents the precision reached by the
production process.
13 Replacing batteries
Before changing batteries, please read the following instruction and
follow it step by step.
Not following the instruction may cause harm to the instrument or the
protection against ingress of water and dust may be lost!
Avoid unnecessary opening of the instrument!
1. Open the 3 Phillips screws at the backside of the instrument.
2. Lay down the still closed instrument, so that the display side
points upwards.
The lower half of the housing incl. the electronics should be kept
lying down during battery change.
This avoids loss of the 3 sealing rings placed in the screw holes.
3. Lift off upper half of housing. Keep an eye on the six function
keys, to be sure not to damage them.
4. Change carefully the two batteries (Type: AAA).
5. Check: Are the 3 sealing rings placed in the housing?
Is the circumference seal of the upper half sound and clean?
6. Close the housing, taking care that it is positioned correctly,
otherwise the sealing may be damaged. Afterwards press the
two halves together, lay the instrument with display pointing
downwards and screw it together again
Take care to screw only until you feel increasing resistance,
higher screwing force does not result in higher water protection!

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14 Error and System Messages
Display
Description
What to do?
No display or
confused
characters,
device does not
react on keypress
Battery empty
Replace battery
Mains operation: wrong voltage or polarity
Check power supply, replace it when necessary
System error
Disconnect battery and power supplies, wait shortly,
then reconnect
Device defective
Return to manufacturer for repair
Err.1
Measured value above allowable range
Check: Measuring value not within sensor range?
-> measuring value to high!
Sensor defective
Return to manufacturer for repair
Err.2
Measured value below allowable range
Check: Measuring value not within sensor range?
-> measuring value to low!
Sensor defective
Return to manufacturer for repair
Err.7
System error
Return to manufacturer for repair
Value extremely out of measuring range
Check: Value not within sensor range?
>CAL<
CAL flashing in
display
Either preset calibration interval has
expired or last calibration is not valid
Device has to be calibrated!
Neutral buffer not permissible
Wrong buffer solution
Always use neutral buffer as first solution (exception:
1 point calibration)
Buffer solution defective
Use new buffer solution
Electrode defective
Clean electrode and calibrate again, if error occurs
again -> replace electrode
Slope is too low
Electrode defective
Replace electrode
Buffer solution defective
Use new buffer solution
Slope is too high
Electrode defective
Replace electrode
Buffer solution defective
Use new buffer solution
Incorrect calibration temperature
Calibration can only be done at 0…60 °C
If “bAt” is flashing, the battery will be exhausted soon. Further measurements are possible for short time. If
“bAt” is displayed continuously the battery is ultimately exhausted and has to be replaced. Further
measurements aren’t possible any more.
15 Reshipment and Disposal
15.1 Reshipment
DANGER
All devices returned to the manufacturer have to be free of any residual of measuring media
and/or other hazardous substances. Measuring residuals at housing or sensor may be a risk for
persons or environment
Use an adequate transport package for reshipment, especially for fully functional devices.
Please make sure that the device is protected in the package by enough packing materials.
15.2 Disposal instructions
Batteries must not be disposed in the regular domestic waste but at the designated collecting
points.
The device must not be disposed in the unsorted municipal waste! Send the device directly to us
(sufficiently stamped), if it should be disposed. We will dispose the device appropriate and
environmentally sound.

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16 Specification
Measuring ranges
pH
-2.000 ... 16.000 pH
ORP / mV
-1999.9 … 1999.9 mV
Relating to hydrogen system: -1792 … +2207 mVH(at 25°C, DIN 38404)
rH
0.0 … 70.0 rH
Temperature
-5.0 … +150.0 °C, Pt1000 or NTC 10k
23.0 …302.0 °F
Accuracy
pH
±0.005 pH
ORP / mV
±0.05% FS
Temperature
±0.2 K (in the range of -5,0…100,0°C)
Working conditions
-25 to 50 °C; 0 to 95 % RH (non condensing)
Storage temperature
-25 to 70 °C
Connections
pH, ORP
BNC-socket, suitable for standard BNC and water-proof BNC cables
additional connection for reference electrode: 4mm banana socket
Temperature
Pt1000 or NTC 10k via 4 mm banana socket
Interface /
ext. supply
4-pole connector for serial interface and supply
Input resistance
pH, ORP
>1012 Ohm
Display
4 ½ digit 7-segment, additional bar graph display for battery and electrode,
illuminated
pH calibration
Automatic
1 -, 2- or 3-point calibration,
either DIN 19266-buffer or technical buffer GPH / PHL
Manual
1 -, 2- or 3- point calibration
GLP
adjustable calibration intervals (1 to 365 days, CAL warning after expiration)
Additional functions
Min / max / hold
Housing
Break-proof ABS housing, incl. silicone protective cover
Protection class
IP65, IP67
Dimensions
L*B*H [mm]
160 * 86 * 37 incl. silicone protective cover,
approx. 250 g incl. battery and cover
Power supply
Current consumption
2*AAA batteries, (included in delivery)
0.8 mA (Out = oFF, equivalent to 1250 h), illumination ~10mA (auto-off)
Change battery indicator
Automatically if battery exhausted “bAt”, warning “bAt” flashing
Auto-off-function:
Device will be automatically switched off if no key is pressed/no interface
communication takes place for the time of the power-off delay. The power-off
delay can be set to values between 1and 120 min.; it can be completely
deactivated.
EMV
The device corresponds to the essential protection ratings established in the
Regulations of the Council for the Approximation of Legislation for the member
countries regarding electromagnetic compatibility (2004/108/EG). Additional
fault: <1%

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17 Note A: temperature influence on pH buffer solutions
GPH buffer capsules for 100 ml buffer solution
Capsules for do-it-yourself mixing –unopened capsules can be stored a long time (approx. 3 years)
T [°C]
10
20
25
30
40
GREISINGER GPH 4.0
3.99
3.99
4.01
4.01
4.03
GREISINGER GPH 7.0
7.06
7.01
7.00
6.99
6.98
GREISINGER GPH 10.0
10.18
10.06
10.01
9.97
9.89
GREISINGER GPH 12.0
12.35
12.14
12.00
11.89
11.71
PHL buffer solutions in dosing bottles 250 ml
Buffer solutions are ready for use, with dosing volume of 20 ml - 25 ml
T [°C]
10
20
25
30
40
GREISINGER PHL 4,0
(pH 4.01 +/- 0.015 @25°C)
4.02
4.00
4.01
4.01
4.01
GREISINGER PHL 7,0
(pH 7.00 +/- 0.015 @25°C)
7.06
7.02
7.00
6.99
6.97
GREISINGER PHL 10,0
(pH 10.01 +/- 0.030 @25°C)
10.18
10.07
10.01
9.97
9.89
18 Note B: preparation of pH buffer solutions
General information on pH buffer solutions
The actual characteristic curve of pH electrodes deviates from the ideal characteristic. Thus the electrodes have to
be calibrated before initial operation and thereafter at regular intervals to get accurate measuring values.
At least a 2-point calibration is required to get the parameters ‘offset’ and ‘slope’. Two different buffer solutions are
necessary for this.
A 1-point calibration only affects the ‘offset’ whereas ‘slope’ is assumed to be the ideal value of -59.2 mV/pH. A
device calibrated only at 1 point assures only accurate measuring values at a range close to the buffer value.
Buffer capacity β
The pH value of a buffer solution changes only very little when small amounts of acids or bases are added. The
buffer capacity β and the dilution influence dpH are values to measure this capability. The buffer capacity β is the
amount of a strong acid or base that has to be added to 1 liter of the buffer solution in order to change its pH value
by 1. The dilution influence dpH is the change of the pH value of the buffer solution when it is diluted with pure
water at a ratio of 1 to 1.
Typical values for buffer capacity and dilution influence are: β = 0.03; dpH = 0.05
Please consider when chosing buffers solutions: date of expiry
Unopened and well stored buffer capsules (GPH) can be stored for a very long time in contrast to ready to use or
self prepared buffer solutions. Caution with alkaline buffers: they age comparatively fast if opened (i.e. at air). The
buffer gets more acid, because carbon dioxide from air is dissolved.
How to prepare calibration buffers of standard GPH series (capsules)
1. Fill 2 plastic bottles with 100 ml distilled water each.
2. Open pH 7 capsule (green) carefully (turn one half of the capsule while pulling and make sure not to
spill any of the powder); put content (including both capsule parts) into one of the bottles.
3. Put content of pH 4 capsule (orange) (or pH 10, blue) and both capsule parts into a second bottle..
The capsule shell will color the liquid in the respective color:
orange = pH4.01; green = pH7.00; blue = pH10.01
Make sure to prepare buffer solutions in time as they can only be used after at least 3 hours.
Shake well before use.

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