GHM Greisinger GMH 3551 User manual

H70.0.11.6C-04
GHM GROUP - Greisinger
GHM Messtechnik GmbH | Hans-Sachs-Str. 26 | 93128 Regenstauf | GERMANY
Tel.: [phone] | [email protected] | www.greisinger.de
as of version V1.4 GMH 3551
WEEE-Reg.-Nr. DE 93889386
Operating Manual
Handheld pH / ORP-Meter
with data logger

Please carefully read these instructions before use!

Please consider the safety instructions!

Please keep for future reference!

H70.0.11.6C-04 Operating Manual GMH 3551 page 2 of 20
Content
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 OPERATION AND MAINTENANCE ADVICE..............................................................................................................4
4HANDLING................................................................................................................................................................5
4.1 DISPLAY ................................................................................................................................................................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 .............................................................................................................................................7
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 (if logger is deactivated).............................8
6.4 PHELECTRODE ......................................................................................................................................................8
6.4.1 Design............................................................................................................................................................8
6.4.2 Further Information.......................................................................................................................................8
6.4.3 pH electrode suggestions...............................................................................................................................9
6.5 CALIBRATION OF PHMEASUREMENT....................................................................................................................9
6.5.1 How to prepare calibration buffers of standard GPH series (capsules) .......................................................9
6.5.2 Automatic temperature compensation during calibration.............................................................................9
6.5.3 How to carry out calibration .........................................................................................................................9
7CONFIGURATION.................................................................................................................................................11
8DATA LOGGER......................................................................................................................................................13
8.1 MANUAL RECORDING (“FUNC-STOR”) ...............................................................................................................13
8.2 AUTOMATIC RECORDING WITH SELECTABLE CYCLE TIME (“FUNC CYCL“).....................................................14
9OUTPUT ...................................................................................................................................................................15
9.1 SERIAL INTERFACE..............................................................................................................................................15
9.2 ANALOG OUTPUT.................................................................................................................................................16
10 INPUT ADJUSTMENT...........................................................................................................................................16
11 GLP ...........................................................................................................................................................................16
11.1 CALIBRATION INTERVAL (C.INT) .......................................................................................................................16
11.2 CALIBRATION STORAGE (READ CAL) ...............................................................................................................16
12 ALARM („AL.“) ......................................................................................................................................................17
13 REAL TIME CLOCK („CLOC“) ..........................................................................................................................17
14 ACCURACY CHECK / ADJUSTMENT SERVICE............................................................................................17
15 ERROR AND SYSTEM MESSAGES ...................................................................................................................18
16 RESHIPMENT AND DISPOSAL..........................................................................................................................18
16.1 RESHIPMENT.......................................................................................................................................................18
16.2 DISPOSAL INSTRUCTIONS ...................................................................................................................................18
17 SPECIFICATION....................................................................................................................................................19
18 NOTES A: TEMPERATURE INFLUENCE ON PH BUFFER SOLUTIONS..................................................20
19 NOTES B: PREPARATION OF PH BUFFER SOLUTIONS.............................................................................20

H70.0.11.6C-04 Operating Manual GMH 3551 page 3 of 20
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, 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:
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.

H70.0.11.6C-04 Operating Manual GMH 3551 page 4 of 20
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 this device 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.
6.
This device is not constructed for use in medical applications.
7.
The analog output is designed to output the current measured value and may only be
used in a non-process-relevant manner in applications where no personal or material
damage can occur.
3 Product Specification
3.1 Operation and maintenance advice
1. Battery operation:
If and ‘bAt’ are 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.
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. Mains operation with power supply
When using a power supply please note that operating voltage has to be 10.5 to 12 V DC.
Do not apply overvoltage!! Cheap 12V-power supplies often have excessive no-load voltage.
We, therefore, recommend using regulated voltage power supplies.
Prior to connecting the power supply to the mains make sure that the operating voltage stated
at the power supply is identical to the mains voltage.
The external supply must not have a galvanic connection to the measurement medium, as this
can influence the measurement and thus lead to measurement errors.
Trouble-free operation is guaranteed by our power supply GNG10/3000.
3. Treat device and sensor carefully. Use only in accordance with above specification. (do not throw, hit
against etc.). Protect plug and socket from soiling.
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!

H70.0.11.6C-04 Operating Manual GMH 3551 page 5 of 20
4 Handling
4.1 Display
1
Main display: pH value,
ORP value (mV, mVH),
rH value
2
Display elements to show minimum/maximum/
memorized measuring value
3
Arrows to selected measuring unit
4
Warning signal (low battery or recalibration prompt)
5
atc arrow: indicates if temperature sensor is
connected and therefore automatic
temperature compensation is active (only
for ‘pH’, ‘mVH’ and ‘rH’ measuring mode)
6
stab arrow: indicates stable measuring value
7
cal arrow: indicates a running calibration
(at operation mode ‘pH’).
8
Secondary display: temperature value
9
logg arrow: logger is ready
arrow flashing: automatic recording (Logg CYCL) is active
4.2 Pushbuttons
On / off key
Set/Menu:
press for 2 sec. (menu): invoke configuration 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
+
min/max when taking measurements:
press shortly: min. or max. meas. value so far will be
displayed
press for 2 sec.: the min. or max. value will be deleted
Configuration:
to enter values, or change settings
Store/Quit
-Measuring:
with Auto-Hold off: hold and save current measuring value (‘HLD’ is displayed)
with Auto-Hold on: start new measuring, It is finished , when “HLD’ shows in display
(refer to chapter 7)
-or if logger activated: calling the logger functions (refer to chapter 8)
-Set/Menu: confirm settings, return to measuring
CAL: (only at mode ‘pH’)
press shortly: display of electrode state rating –additional short presses: show actual
calibration data
press for 2 sec: start pH calibration
1 2 3
4 5 6
ON
OFF max
Store
CAL
min
Set
Menu Quit
pHmV mV
H
rH
ATC ok CAL AL Logg pH
mbar

H70.0.11.6C-04 Operating Manual GMH 3551 page 6 of 20
4.3 Connections
interface: connection for galv. Isolated interface adapter
(accessory: GRS 3100, GRS3105 or USB3100)
BNC socket: connection of pH or ORP electrode
(glass electrodes or combination electrodes)
Banana sockets:
Connection of Pt1000 temperature probe
Electrodes with integrated temperature sensor:
the banana plug is connected from outside
Separately lead through reference electrode:
it is connected from inside
Power supply: additional d.c.connector (internal pin Ø 1.9
mm) for external 10.5-12V direct voltage supply
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

H70.0.11.6C-04 Operating Manual GMH 3551 page 7 of 20
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 10 „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):
  󰇡󰇛󰇜󰇛󰇜
 
 󰇢with 󰇛󰇜: concentration of dissolved hydronium ions in mol/l
󰇛󰇜: 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
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
1 2 3
4 5 6
ON
OFF max
Store
CAL
min
Set
Menu Quit

H70.0.11.6C-04 Operating Manual GMH 3551 page 8 of 20
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 (if logger is deactivated)
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 device.
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.
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
1 2 3
4 5 6
ON
OFF max
Store
CAL
min
Set
Menu Quit
1 2 3
4 5 6
ON
OFF max
Store
CAL
min
Set
Menu Quit
1 2 3
4 5 6
ON
OFF max
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CAL
min
Set
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1 2 3
4 5 6
ON
OFF max
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CAL
min
Set
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1 2 3
4 5 6
ON
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CAL
min
Set
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1 2 3
4 5 6
ON
OFF max
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CAL
min
Set
Menu Quit

H70.0.11.6C-04 Operating Manual GMH 3551 page 9 of 20
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 104 BNC (as of 20 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.
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 11 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“).

H70.0.11.6C-04 Operating Manual GMH 3551 page 10 of 20
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 display shows the electrode’s
state rating.
2. Rinse electrode in distilled or deionized water, dry electrode
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 display 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 display 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.
1 2 3
4 5 6
ON
OFF max
Store
CAL
min
Set
Menu Quit
1 2 3
4 5 6
ON
OFF max
Store
CAL
min
Set
Menu Quit
1 2 3
4 5 6
ON
OFF max
Store
CAL
min
Set
Menu Quit
1 2 3
4 5 6
ON
OFF max
Store
CAL
min
Set
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1 2 3
4 5 6
ON
OFF max
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CAL
min
Set
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1 2 3
4 5 6
ON
OFF max
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CAL
min
Set
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1 2 3
4 5 6
ON
OFF max
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CAL
min
Set
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1 2 3
4 5 6
ON
OFF max
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CAL
min
Set
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1 2 3
4 5 6
ON
OFF max
Store
CAL
min
Set
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1 2 3
4 5 6
ON
OFF max
Store
CAL
min
Set
Menu Quit
1 2 3
4 5 6
ON
OFF max
Store
CAL
min
Set
Menu Quit
1 2 3
4 5 6
ON
OFF max
Store
CAL
min
Set
Menu Quit
1 2 3
4 5 6
ON
OFF max
Store
CAL
min
Set
Menu Quit
1 2 3
4 5 6
ON
OFF max
Store
CAL
min
Set
Menu Quit