Handheld Meter for pH, Redox, and rH
Type 202710/20
Operating Manual
20271020T90Z001K000
V2.00/EN/00461261
Contents
1 Typographical conventions ...................................................... 7
1.1 Warning symbols .........................................................................................7
1.2 Note symbols ...............................................................................................7
2 General information .................................................................. 8
2.1 Preface .........................................................................................................8
2.2 Intended use ................................................................................................8
2.3 Safety information ........................................................................................8
2.4 Notes on operation and maintenance ........................................................10
2.4.1 Battery operation .......................................................................................10
2.4.2 Power supply unit operation ......................................................................10
3 Identifying the device version ................................................ 11
3.1 Nameplate ..................................................................................................11
3.2 Order details ...............................................................................................11
3.3 Accessories ................................................................................................11
4 Operation ................................................................................. 12
4.1 Display .......................................................................................................12
4.2 Control elements ........................................................................................13
4.3 Connections ...............................................................................................14
4.4 Stand-up hinge ..........................................................................................14
5 Measuring ................................................................................ 15
5.1 Preparing the device for the measurement ................................................15
5.2 Measuring the pH value .............................................................................15
5.3 Measuring the redox potential ...................................................................17
5.4 Detecting the rH value ...............................................................................18
5.4.1 Determining the rH value by manually inputting the pH value ...................18
5.4.2 Determining the rH value by automatically transferring the pH value ........19
5.5 Saving a measured value with the hold function (HLD) .............................20
6 Calibration of the pH combination electrode ....................... 21
6.1 General information regarding calibration ..................................................21
6.2 Preparing for calibration .............................................................................21
Contents
6.3 Calibration with temperature probe ...........................................................22
6.3.1 Calibration with standard buffer series, example using technical
buffer series ...............................................................................................22
6.3.2 Calibration with any buffers .......................................................................23
6.4 Calibration without temperature probe ......................................................25
6.4.1 Calibration with standard buffer series, example using technical
buffer series ...............................................................................................25
6.4.2 Calibration with any buffers .......................................................................27
6.5 Display of the condition of the pH combination electrode ........................29
6.6 Displaying specifications of the combination electrode ............................30
6.7 Error messages of the pH calibration ........................................................31
7 Calibration of the measuring inputs ...................................... 32
7.1 Offset/zero point correction and slope correction of the voltage input
and the temperature input ..........................................................................32
8 Device settings ........................................................................ 33
8.1 Calling up the setting menu .......................................................................33
8.2 Resetting to default settings ......................................................................34
8.3 Configuring the device ...............................................................................34
8.3.1 Submenu "SEt ConF": general settings .....................................................34
8.3.2 Submenu "SEt Out": serial interface settings ............................................40
8.4 Parameterizing the device ..........................................................................41
8.4.1 Submenu "SEt Corr": offset/zero point correction and slope correction
of the voltage and temperature measurement ...........................................41
8.4.2 Submenu "SEt CLOC": setting the real-time clock ...................................43
8.4.3 Submenu "rEAd CAL.": reading the calibration data .................................45
9 Maintenance ............................................................................ 46
9.1 Good laboratory practice (GLP) .................................................................46
9.1.1 Calibration timer ("C.int") ...........................................................................46
9.1.2 Reading the calibration data ("rEAd CAL") ................................................46
9.2 Real-time clock ("CLOC") ..........................................................................47
10 Error and system messages .................................................. 48
11 The pH combination electrode .............................................. 49
11.1 pH combination electrodes for different areas of application ....................49
11.2 Cleaning .....................................................................................................50
Contents
11.3 Operating life ..............................................................................................50
11.4 General handling of pH combination electrodes .......................................50
12 The redox combination electrode ......................................... 51
12.1 General handling ........................................................................................51
13 Returns and disposal .............................................................. 52
13.1 Returns .......................................................................................................52
13.2 Disposal .....................................................................................................52
14 Technical data ......................................................................... 53
15 China RoHS ............................................................................. 55
Contents
7
1 Typographical conventions
1.1 Warning symbols
1.2 Note symbols
DANGER!
This symbol indicates that personal injury from electrocution may occur if
the appropriate precautionary measures are not taken.
CAUTION!
This symbol in connection with the signal word indicates that damage to
assets or data loss will occur if the respective precautionary measures are
not taken.
NOTE!
This symbol refers to important information about the product, its handling,
or additional use.
✱ Action instruction
This symbol indicates that an action to be performed is described.
8
2 General information
2.1 Preface
Read through this document carefully and familiarize yourself with the operation of the device before you start using it. Keep this document close at hand
and in the immediate vicinity of the device so that you or the specialist personnel can consult it at all times in case of doubt.
Mounting, startup, operation, maintenance, and decommissioning must only
be performed by personnel with a specialist qualification. The specialist personnel must have carefully read through and understood the operating manual
prior to commencing any work.
The liability and warranty of the manufacturer for damage and consequential
damage is rendered void in the event of improper use, failure to observe this
operating manual, deployment of personnel with insufficient qualifications,
and unauthorized modifications to the device.
The manufacturer is not liable for costs or damages incurred by the user or by
third parties through the use of this device, particularly in the event of
improper use of the device or in the event of misuse or malfunctions relating to
the connection or the device.
2.2 Intended use
The device is designed to measure pH values and redox potential using appropriate sensors. The sensor connection operates via a BNC socket.
There is also the option of connecting a temperature probe (Pt1000 with
banana plugs, part no. 00648463). The measured temperature is displayed on
the subsidiary display of the device and is employed for the automatic temperature compensation (ATC) of the pH, rH, or mV
H
measurement.
The safety information (see chapter 2.3 "Safety information") in this operating
manual must be observed.
The device must only be used under the conditions or for the purposes for
which it has been designed.
The device must be handled with care, protected against pollutants, and used
according to the technical data.
2.3 Safety information
The device was constructed and tested according to the safety requirements
for electrical measuring devices. Please observe the general, customary safety
precautions and the device-specific safety information in this operating manual.
NOTE!
pH and redox measurements require different sensor types!
9
2 General information
DANGER!
If it is to be assumed that risk-free operation of the device is no longer possible, the device must be taken out of service and guarded against subsequent
startup by means of an identification marking. The safety of the user may be
compromised by the device if, for example, the device
• features visible damage,
• no longer operates in the specified manner,
• has been stored in unsuitable conditions for an extended period of time.
In case of doubt, send the device to the manufacturer for repair/maintenance
.
DANGER!
Do not operate with a defective power supply unit!
In this case, potentially fatal excess voltage may occur at the sockets of the
device!
DANGER!
The device is not suitable for safety applications, emergency off equipment,
or applications in which a malfunction could lead to injuries and material
damage. Failure to observe this note may lead to serious damage to health
and material damage!
DANGER!
This device must not be used in a potentially explosive environment. If the
device is operated in a potentially explosive environment, there is an
increased hazard of deflagration, fire, or explosion due to formation of sparks!
NOTE!
The function and operational safety of the device can only be maintained
under the climatic conditions specified in chapter Chapter 14 "Technical
data", page 53.
If the device is transported from a cold environment to a warm environment,
the device may malfunction due to condensate formation. In this case, it is
necessary to wait for the device temperature to align with the room temperature prior to startup.
NOTE!
When connecting to other devices, take particular care in planning the wiring.
Under certain circumstances, internal connections in third-party devices (e.g.
connection of GND to ground) may lead to impermissible voltage potentials
that can cause impaired function or even destruction of the device itself or a
connected device.
2 General information
10
2.4 Notes on operation and maintenance
2.4.1 Battery operation
2.4.2 Power supply unit operation
NOTE!
Please do not connect any devices to socket 1 (see Chapter 4.3 "Con-
nections", page 14)!
NOTE!
The device and sensors must be handled with care and deployed according
to the technical data (do not throw, do not subject to impact, etc.). The connectors and sockets must be protected against pollutants.
NOTE!
If is displayed at the same time as "bAt" is shown in the bottom display,
the battery has been used up and must be replaced. However, the device
function remains guaranteed for a certain period of time.
If "bAt" is shown in the top display, the battery voltage is no longer sufficient
for device operation and the battery is now completely used up.
NOTE!
The battery must be removed if the device is stored at an ambient temperature of over 50 °C. The battery should be removed if the device is not used for
an extended period of time.
It is necessary to set the real-time clock once again after subsequent startup.
CAUTION!
When a power supply unit is connected, its voltage must be between
DC 10.5 V and 12 V. Do not generate any excess voltage! Basic power supply
units may feature excess open circuit voltage, which may lead to malfunction
or destruction of the device!
Prior to connecting the power supply unit to the electricity grid, it must be
ensured that the operating voltage stated on the power supply unit corresponds to the mains voltage.
11
3 Identifying the device version
3.1 Nameplate
Position
The nameplate is fitted to the base of the battery compartment.
Example
Fabrication number (F-Nr.)
The fabrication number provides information such as the production date
(year/week). The production date relates to the characters in positions 12 to 15
(from the left).
Example: F-Nr. = 00822713 01 0 1505 0001
The device was produced in the 05th calendar week of 2015.
3.2 Order details
3.3 Accessories
Handmessgerät 202710/20 – 000
F – Nr. 00822713 01 0 1815 0001
(1) Basic type
202710/20 Manual measuring device for pH, redox, and rH
(2) Extra code
000 none
070 including carry case with pH 4.00 and pH 7.00 calibration
solutions
(1) (2)
Order code /
Order example 202710/20 / 000
Type Part no.
Immersion temperature probe (Pt1000 with banana plug) 00648463
12
4 Operation
4.1 Display
(1) Display of the measured value unit
(2) Warning signal:
In case of low battery or recalibration request
(3) No function
(4) Subsidiary display/subsidiary measured value:
Temperature measured value
(5) Signals in operating mode "pH" that the device is in the calibration
procedure
(6) Signals a stable measured value
(7) Signals that a temperature probe has been connected and that the auto-
matic temperature compensation (ATC) is thus active.
(8) Display elements for the appearance of the minimum (MIN),
maximum (MAX), or saved measured value (HLD)
a
a
The "DIF" display is not supported in this device.
(9) Main display/main measured value:
pH value (pH)
redox voltage (mV, mV
H
)
rH value (rH)
rH mV mV
H
pH
ATCATC okok AL Logg pH
MAX DIF
MIN HL D
F
(1) (1) (1) (1)
(1)
(1)
(2)
(1)
(1)
(1)(3)(5)(7)
(8)
(4)
(8)
(9)
CALCAL
(3)(6)
13
4 Operation
4.2 Control elements
The descriptions printed in black on the control keys relate to functions that
are available in measurement mode.
The descriptions and symbols printed in red on the control keys relate to functions that are available when setting the device.
Key Function
during the measurement
Function
in setting menu
On/off switch
min/max...
... pressed briefly:
Display minimum or maximum
value measured so far
... pressed for 2 seconds:
Delete the value in
question
/
Enter values or modify settings
CAL... (only in operating mode
"pH")
... pressed briefly:
Display the condition of the
combination electrode (1x
press), display the calibration
data (additional presses)
... pressed for 2 seconds:
Start the pH calibration
"Scroll" through the parameter
sublevels of the submenu
Store:
Hold and save the
current measured value
("HLD" in display)
Quit:
Return to measuring, entries/
settings will be saved
Set... (in operating modes "pH",
"rH", and "mV
H
"
... pressed briefly:
manual temperature input if no
temperature probe is connected.
additionally for "rH" mode
:
manual input of pH value
(press key a second time)
... pressed for 2 seconds:
Call up the setup menu
Menu:
Return to setting menu, entries/
settings will be saved
ON
OFF
1
5
min
max
2
CAL
3
6
Store
Quit
4
Set
Menu
4 Operation
14
4.3 Connections
4.4 Stand-up hinge
Operation: ✱ Pull on the "open" lettering to fold out the stand-up hinge to a position of
90 ° (1). Pull on the "open" lettering again to fold out the stand-up hinge to
a position of 180 ° (2).
Functions: When the stand-up hinge is closed, the device can be laid flat on the table or
secured on a belt.
When the stand-up hinge is at a position of 90 °, the device can be set up on
an even surface.
When the stand-up hinge is at a position of 180 °, the device can be hung on
a hook, for example.
(1) BNC socket to connect a pH or a redox combination electrode
(2) This socket doesn‘t have a function, please don‘t connect any devices
(3) Socket for connecting a power supply unit
(4)/(5) Banana sockets to connect a Pt1000 temperature probe
(part no. 00648463)
(2)
(1)
(3)
(4)
(5)
Stand-up hinge closed Stand-up hinge positioned at 90°/180°
15
5 Measuring
5.1 Preparing the device for the measurement
✱Connect the combination electrode and, if applicable, the temperature probe
to the device.
✱Briefly press the key.
If a zero point correction (offset) or slope correction has been performed on
the voltage or temperature measurement (see chapter 7.1, page 32), the
device accordingly briefly displays " " after the segment test.
The device is subsequently ready to commence measuring.
5.2 Measuring the pH value
Selecting the measurand
The device is preconfigured per default for measuring the pH value.
If the device has been configured for a different measurand in a user-
defined operation, first select the measurand "pH" (see "Parameter "InP":
selection of a measurand", page 35).
Definition
The pH value describes the acidity or alkalinity of an aqueous solution.
pH values under 7 indicate acidity, pH values over 7 indicate alkalinity,
pH 7 = neutral.
NOTE!
The device is preconfigured per default for measuring the pH value.
NOTE!
When measuring, always ensure that your pH and redox combination
electrode is in good condition and was cleaned and dried before being
inserted into the solution.
The device activates all display segments
for a short time (segment test).
5 Measuring
16
The pH value is calculated based on the negative common logarithm of the
hydrogen ion activity (this is often approximately the same as the hydrogen ion
concentration):
The abbreviation "pH" stands for pondus Hydrogenii (Latin: pondus = weight;
Hydrogenium = hydrogen).
Since the pH value is dependent on temperature, it should always be recorded
together with the measured temperature.
Example: pH 5.87 at 22.8 °C.
The pH measurement is a very precise but also sensitive measurement. The
measured signals are very weak (high-impedance), especially when measured
using weak/ion-deficient media.
The following points should therefore be observed:
• Avoid malfunctions (electrostatic charges, etc.)
• Stir measurement solution slowly to achieve a stable measured value
• Dry plug-in contacts and keep them clean
• If possible, do not immerse the combination electrodes in the measurement
solution beyond the shaft for a long time (except for with special waterproof
versions)
• Configure the combination electrode sufficiently frequently (calibration
interval is dependent on the combination electrode and the usage and can
vary between an hour and several weeks)
• Use a suitable combination electrode.
Measuring without temperature probe
✱Insert the pH combination electrode and the temperature probe into the
solution and gently stir until a stable measured value is achieved.
✱Adjust the temperature value of the measurement solution using the and
keys.
c(H+) = hydrogen ion concentration
in mol/l
ƒ(H
+
) = activity coefficient of the
hydrogen ions (usually < 1)
pH value
=
c(H ) × (H
++
¦ )
1 mol/l
–log
10
()
The measured pH value appears on the main display
and the set temperature appears on the subsidiary display of the device.
rH mV mVHpH
ATC o k AL Logg pH
CAL
17
5 Measuring
Measuring with temperature probe
✱Insert the pH combination electrode and the temperature probe into the
solution and gently stir until a stable measured value is achieved.
5.3 Measuring the redox potential
Selecting the measurand
If the device has been configured for a different measurand in a userdefined operation, first select the measurand "mV" (see "Parameter
"InP": selection of a measurand", page 35).
Definition
The redox potential (or: ORP) indicates the extent to which the measured sample has an oxidizing or reducing effect in relation to the hydrogen standard
electrode.
This potential is often used in swimming pools as a measurand for the disinfecting effect of a chlorine. The redox value is also an important parameter for
aquarists as fish can only live within a particular redox range. The measured
value also plays an important role in drinking water treatment, water monitoring, and in industry.
The measurement occurs with the commonly used silver/silver chloride combination electrodes (reference system with 3 molar potassium chloride solution). The measured value can be taken directly ("mV" setting) or be automatically converted with temperature compensation to the "hydrogen standard
electrode reference system" using the "mV
H
" setting.
Calibration, such as with pH measurement, does not take place with redox
measuring. The suitability of combination electrodes can, however, be
checked at any time using redox test solutions.
Measuring
✱Insert the redox combination electrode into the solution and gently stir.
The measured pH value appears in the main display
and the measured temperature appears on the subsidiary display of the device.
rH mV mVHpH
ATC o k AL Logg pH
CAL
The measured redox potential appears in the main display of the device.
If a temperature probe is connected, the measured
temperature also appears on the subsidiary display of
the device.
rH mV mVHpH
ATC o k AL Logg pH
CAL
5 Measuring
18
5.4 Detecting the rH value
Selecting the measurand
If the device has been configured for a different measurand in a userdefined operation, first select the measurand "rH" (see "Parameter "InP":
selection of a measurand", page 35).
Definition
The rH value is a value calculated from a pH and a redox measurement. It is
used, for example, to describe the antioxidant power of food. This is a measurement used to determine the ability of food to reduce harmful free radicals
(bioelectronics according to Prof. Vincent).
There are two ways of determining the rH value using this device:
•by manually inputting the pH value or
•by automatically transferring the pH value from a pH measurement
5.4.1 Determining the rH value by manually inputting the pH value
Prerequisite:
• The pH value of the measurement solution must be known.
• A redox combination electrode must be connected to the device.
Measuring without temperature probe
✱Briefly press the key.
✱Adjust the temperature value of the measurement solution using the and
keys.
✱Briefly press the key again.
✱Adjust the pH value of the measurement solution using the and keys.
✱Confirm and save the entries with the key.
✱Insert the redox combination electrode into the solution and gently stir.
Measuring with temperature probe
✱Briefly press the key.
✱Adjust the pH value of the measurement solution using the and keys.
✱Confirm and save the entries with the key.
✱Insert the redox combination electrode into the solution and gently stir.
The determined rH value appears
on the main display, the input values for the temperature and pH
appear alternately on the subsidiary display of the device.
rH mV mVHpH
ATC o k AL Logg pH
CAL
rH mV mVHpH
ATC o k AL Logg pH
CAL
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