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
19
5 Measuring
5.4.2 Determining the rH value by automatically transferring the pH value
Prerequisites
• A pH and a redox combination electrode, as well as a temperature probe if
required, must be placed in the measurement solution
• The pH combination electrode must be connected to the device
• The device must first be configured for the measurand "pH"
Measuring without temperature probe
✱Connect the pH combination electrode to the device.
✱Briefly press the key.
✱Adjust the temperature value of the measurement solution using the and
keys.
✱Save the temperature value with the key.
✱Save the stable measured pH value with the key ("HLD" appears in the
display).
✱Connect the redox combination electrode to the device.
✱Configure the device for measurand "rH".
✱Gently stir the measurement solution.
Measuring with temperature probe
✱Connect the pH combination electrode to the device.
✱Save the stable measured pH value with the key ("HLD" appears in the
display).
The determined rH value appears
on the main display, the measured
value for the temperature and the
input value for the 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
NOTE!
Do not switch off the device until the rH measurement is finished or the
saved pH value will be deleted.
The determined rH value appears
on the main display, the input value
for the temperature and the measured value for the 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
5 Measuring
20
✱Connect the redox combination electrode to the device.
✱Configure the device for measurand "rH".
✱Gently stir the measurement solution.
5.5 Saving a measured value with the hold function (HLD)
The device features a "HOLD" function for saving a measured value.
Depending on the device configuration (see "Parameter "Auto HLD": auto-
matic saving of a measured value", page 38), the measured value can be
saved either by pressing the key or automatically when a stable measured
value is reached.
When the measured value has been saved successfully, the message "HLD"
appears on the device display.
Press the key again to delete the saved value.
When automatic saving is activated, the next stable measured value will subsequently be saved.
NOTE!
Do not switch off the device until the rH measurement is finished or the
saved pH value will be deleted.
The determined rH value appears
on the main display, the measured
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
21
6 Calibration of the pH combination electrode
6.1 General information regarding calibration
The parameters of pH combination electrodes are subject to fluctuations due
to aging and individual variations. It is therefore advisable to check the calibration of the combination electrode before taking a measurement. If the deviation is unacceptable, the combination electrode must be recalibrated.
Buffer solutions with an exact pH value are needed for calibration.
The device can be configured for the following buffer series:
• Standard series (4.01 pH, 7.00 pH, and 10.01 pH)
•DIN series
(1.68 pH [A], 4.01 pH [C], 6.87 pH [D], 9.18 pH [F],
and 12.45 pH [G])
• or any buffer (neutral buffer within the range 6.5 to 7.5 pH).
6.2 Preparing for calibration
✱ Configure the device for the measurand "pH", see "Parameter "InP":
selection of a measurand", page 35
✱ Select the calibration method (1, 2 or 3 point calibration), see "Parameter
"CAL": selection of the number of calibration points", page 36
✱ Select the buffer series for the calibration, see "Parameter "CAL.P": selec-
tion of the buffer series", page 37
✱ Carefully remove the protective cap (containing 3 mol KCl) from the combi-
nation electrode.
✱ Rinse the combination electrode and the temperature probe (if available)
with de-ionized (distilled) water and dry.
CAUTION!
The operating life of buffer solutions is limited and is significantly shortened
by inadequate cleaning and drying of the combination electrode when
switching between solutions. This can lead to calibration errors!
If possible, use new solutions when calibrating.
Rinse with de-ionized or distilled water!
NOTE!
The automatic temperature compensation when calibrating
Both the signal of the pH combination electrode and the pH buffer are
dependent on temperature. A Pt1000 temperature probe (optional) connected to the manual measuring device automatically compensates for temperature influence.
If a temperature probe is not available, the actual temperature of the respective buffer should be entered as accurately as possible, see chapter 6.4 "Calibration without temperature probe", page 25.
The temperature influences of the buffers are also compensated for when
using the standard buffer series or the DIN buffer series.
When using any buffer, the pH values of the buffers must be entered in line
with the current temperature.
6 Calibration of the pH combination electrode
22
6.3 Calibration with temperature probe
6.3.1 Calibration with standard buffer series, example using technical
buffer series
Calibration point 1
✱ Press the key for at least 2 seconds to start the calibration.
✱ Insert the combination electrode and the temperature probe into the first
buffer solution and gently stir.
With 1 point calibration selected, the condition of the combination electrode
is then briefly displayed and then the 1 point calibration is completed and the
device returns to measurement mode.
Rinsing
✱ Rinse the combination electrode and the temperature probe with de-ion-
ized (distilled) water and dry.
Calibration point 2
✱ Insert the combination electrode and the temperature probe into the sec-
ond buffer solution and gently stir.
NOTE!
If the 2 or 3 point calibration has been selected as the calibration method,
the device expects a neutral buffer solution within the range pH 6.5 to pH 7.5
for the first calibration point.
The device automatically detects the buffer solutions of the technical buffer
series and the DIN buffer series.
If the 1 point calibration has been selected as the calibration method, any
buffer solution can be employed (so, for example, also pH 4 or pH 10 when
selecting a technical buffer series).
The value "7.0" appears on the main display of the
device, "Pt.1" and a revolving symbol appear on the
subsidiary display of the device.
If the measured pH value is outside of the acceptable
range, the value "7.0" flashes.
If the measured pH value is within the acceptable
range and is stable, the device saves the value automatically as calibration point 1.
The values "4.0" and "10.0" appear alternately on the
main display of the device, "Pt.2" and a revolving
symbol appear on the subsidiary display of the device
to indicate that a buffer solution with either pH 4 or
pH 10 is expected as the second buffer solution.
rH mV mVHpH
ATC o k AL Logg pH
CAL
rH mV mVHpH
ATC o k AL Logg pH
CAL
23
6 Calibration of the pH combination electrode
The device detects the selected buffer solution automatically and saves the
measured pH value as calibration point 2 as soon as it is stable.
With 2 point calibration selected, the condition of the combination electrode
is then briefly displayed and then the 2 point calibration is completed and the
device returns to measurement mode.
Rinsing
✱ Rinse the combination electrode and the temperature probe with de-ion-
ized (distilled) water and dry.
Calibration point 3
✱ Insert the combination electrode and the temperature probe into the third
buffer solution and gently stir.
The device detects the buffer solution automatically and saves the measured
pH value as calibration point 3 as soon as it is stable.
Finally, the condition of the combination electrode is briefly displayed and then
the 3 point calibration is completed and the device returns to measurement
mode.
6.3.2 Calibration with any buffers
Calibration point 1
✱ Press the key for at least 2 seconds to start the calibration.
✱ Use the and keys to set the value for the neutral buffer solution.
✱ Insert the combination electrode and the temperature probe into the first
(neutral) buffer solution and gently stir.
The value of the third calibration point flashes on the
main display of the device, "Pt.3" and a revolving
symbol appear on the subsidiary display of the
device.
rH mV mVHpH
ATC o k AL Logg pH
CAL
NOTE!
For a sufficiently accurate reading of the slope, the pH values of the selected
buffer solutions should not be too close together (minimum gap of 2 pH from
the neutral buffer).
NOTE!
If the 2 or 3 point calibration has been selected as the calibration method,
the device expects a neutral buffer solution within the range pH 6.5 to pH 7.5
for the first calibration point.
If the 1 point calibration has been selected as the calibration method, any
buffer solution with a known pH value can be employed.
6 Calibration of the pH combination electrode
24
✱ Press the key when the measured value is stable (small triangle
appears on the display above the yellow "ok" label).
With 1 point calibration selected, the condition of the combination electrode
is then briefly displayed and then the 1 point calibration is completed and the
device returns to measurement mode.
✱ Use the and keys to set the value for the second buffer solution.
Rinsing
✱ Rinse the combination electrode and the temperature probe with de-ion-
ized (distilled) water and dry.
Calibration point 2
✱ Insert the combination electrode and the temperature probe into the sec-
ond buffer solution and gently stir.
✱ Press the key when the measured value is stable (small triangle
appears on the display above the yellow "ok" label).
With 2 point calibration selected, the condition of the combination electrode
is then briefly displayed and then the 2 point calibration is completed and the
device returns to measurement mode.
✱ Use the and keys to set the value for the third buffer solution.
Rinsing
✱ Rinse the combination electrode and the temperature probe with de-ion-
ized (distilled) water and dry.
The set value is on the main display of the device,
"Pt.1" and a revolving symbol appear on the subsidiary display of the device.
The value on the main display of the device flashes,
"Pt.2" and a revolving symbol appear on the subsidiary display of the device to indicate that the input of
the pH value for the second buffer solution is
expected.
rH mV mVHpH
ATC o k AL Logg pH
CAL
rH mV mVHpH
ATC o k AL Logg pH
CAL
The value on the main display of the device flashes,
"Pt.3" and a revolving symbol appear in the subsidiary display of the device to indicate that the input of
the pH value for the third buffer solution is expected.
rH mV mVHpH
ATC o k AL Logg pH
CAL
25
6 Calibration of the pH combination electrode
Calibration point 3
✱ Insert the combination electrode and the temperature probe into the third
buffer solution and gently stir.
✱ Press the key when the measured value is stable (small triangle
appears on the display above the yellow "ok" label).
Finally, the condition of the combination electrode is briefly displayed and then
the 3 point calibration is completed and the device returns to measurement
mode.
6.4 Calibration without temperature probe
6.4.1 Calibration with standard buffer series, example using technical
buffer series
Calibration point 1
✱ Press the key for at least 2 seconds to start the calibration.
✱ Insert the combination electrode into the first buffer solution and gently stir.
✱ Use the and keys to set the temperature value for the first buffer
solution and then save by pressing the key.
NOTE!
If the 2 or 3 point calibration has been selected as the calibration method,
the device expects a neutral buffer solution within the range pH 6.5 to pH 7.5
for the first calibration point.
The device automatically detects the buffer solutions of the technical buffer
series and the DIN buffer series.
If the 1 point calibration has been selected as the calibration method, any
buffer solution can be employed (so, for example, also pH 4 or pH 10 when
selecting a technical buffer series).
The value "7.0" appears on the main display of the
device, "Pt.1" and a revolving symbol appear on the
subsidiary display of the device.
If the measured pH value is outside of the acceptable
range, the value "7.0" flashes.
If the measured pH value is within the acceptable
range and is stable, the device saves the value automatically for calibration point 1.
The display changes so that the temperature value
(t.1) for the first buffer solution can be entered.
rH mV mVHpH
ATC o k AL Logg pH
CAL
rH mV mVHpH
ATC o k AL Logg pH
CAL
6 Calibration of the pH combination electrode
26
With 1 point calibration selected, the condition of the combination electrode
is then briefly displayed and then the 1 point calibration is completed and the
device returns to measurement mode.
Rinsing
✱ Rinse the combination electrode with de-ionized (distilled) water and dry.
Calibration point 2
✱ Insert the combination electrode into the second buffer solution and gently
stir.
The device detects the selected buffer solution automatically and saves the
measured pH value for calibration point 2 as soon as it is stable.
✱ Use the and keys to set the temperature value for the second buffer
solution and then save by pressing the key.
With 2 point calibration selected, the condition of the combination electrode
is then briefly displayed and then the 2 point calibration is completed and the
device returns to measurement mode.
Rinsing
✱ Rinse the combination electrode with de-ionized (distilled) water and dry.
Calibration point 3
✱ Insert the combination electrode into the third buffer solution and gently stir.
The device detects the selected buffer solution automatically and saves the
measured pH value for calibration point 3 as soon as it is stable.
The values "4.0" and "10.0" appear alternately on the
main display of the device, "Pt.2" and a revolving
symbol appear on the subsidiary display of the device
to indicate that a buffer solution with either pH 4 or
pH 10 is expected as the second buffer solution.
rH mV mVHpH
ATC o k AL Logg pH
CAL
The display changes so that the temperature value
(t.2) for the second buffer solution can be entered.
The value of the third calibration point flashes on the
main display of the device, "Pt.3" and a revolving
symbol appear 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
27
6 Calibration of the pH combination electrode
✱ Use the and keys to set the temperature value for the third buffer
solution and then save by pressing the key.
Finally, the condition of the combination electrode is briefly displayed and then
the 3 point calibration is completed and the device returns to measurement
mode.
6.4.2 Calibration with any buffers
Calibration point 1
✱ Press the key for at least 2 seconds to start the calibration.
✱ Use the and keys to set the value for the neutral buffer solution.
✱ Insert the combination electrode into the first (neutral) buffer solution and
gently stir.
✱ Press the key when the measured value is stable (small triangle
appears on the display above the yellow "ok" label).
The display changes so that the temperature value for
the third buffer solution can be entered.
rH mV mVHpH
ATC o k AL Logg pH
CAL
NOTE!
For a sufficiently accurate reading of the slope, the pH values of the selected
buffer solutions should not be too close together (minimum gap of 2 pH from
the neutral buffer).
NOTE!
If the 2 or 3 point calibration has been selected as the calibration method,
the device expects a neutral buffer solution within the range pH 6.5 to pH 7.5
for the first calibration point.
If the 1 point calibration has been selected as the calibration method, any
buffer solution with a known pH value can be employed.
The set value for the neutral buffer solution is on the
main display of the device, "Pt.1" and a revolving
symbol appear on the subsidiary display of the
device.
rH mV mVHpH
ATC o k AL Logg pH
CAL
6 Calibration of the pH combination electrode
28
✱ Use the and keys to set the temperature value for the first buffer
solution and then save by pressing the key.
With 1 point calibration selected, the condition of the combination electrode
is then briefly displayed and then the 1 point calibration is completed and the
device returns to measurement mode.
✱ Use the and keys to set the value for the second buffer solution.
Rinsing
✱ Rinse the combination electrode and the temperature probe with de-ion-
ized (distilled) water and dry.
Calibration point 2
✱ Insert the combination electrode and the temperature probe into the sec-
ond buffer solution and gently stir.
✱ Press the key when the measured value is stable (small triangle
appears on the display above the yellow "ok" label).
✱ Use the and keys to set the temperature value for the second buffer
solution and then save by pressing the key.
With 2 point calibration selected, the condition of the combination electrode
is then briefly displayed and then the 2 point calibration is completed and the
device returns to measurement mode.
The display changes so that the temperature value
(t.1) for the first buffer solution can be entered.
The value on the main display of the device flashes,
"Pt.2" and a revolving symbol appear on the subsidiary display of the device to indicate that the input of
the pH value for the second buffer solution is
expected.
rH mV mVHpH
ATC o k AL Logg pH
CAL
rH mV mVHpH
ATC o k AL Logg pH
CAL
The display changes so that the temperature value
(t.2) for the second buffer solution can be entered.
rH mV mVHpH
ATC o k AL Logg pH
CAL
29
6 Calibration of the pH combination electrode
✱ Use the and keys to set the value for the third buffer solution.
Rinsing
✱ Rinse the combination electrode with de-ionized (distilled) water and dry.
Calibration point 3
✱ Insert the combination electrode and the temperature probe into the third
buffer solution and gently stir.
✱ Press the key when the measured value is stable (small triangle
appears on the display above the yellow "ok" label).
✱ Use the and keys to set the temperature value for the third buffer
solution and then save by pressing the key.
Finally, the condition of the combination electrode is briefly displayed and then
the 3 point calibration is completed and the device returns to measurement
mode.
6.5 Display of the condition of the pH combination electrode
✱ Briefly press the key.
The value on the main display of the device flashes,
"Pt.3" and a revolving symbol appear in the subsidiary display of the device to indicate that the input of
the pH value for the third buffer solution is expected.
rH mV mVHpH
ATC o k AL Logg pH
CAL
The display changes so that the temperature value
(t.3) for the third buffer solution can be entered.
rH mV mVHpH
ATC o k AL Logg pH
CAL
NOTE!
After every calibration, the condition of the pH combination electrode is displayed for approximately 3 seconds.
The condition of the pH combination electrode is displayed for approximately 3 seconds.
100 %: The combination electrode is in very good condition
90 to 30 %: The condition of the combination electrode is adequate
rH mV mVHpH
ATC o k AL Logg pH
CAL
6 Calibration of the pH combination electrode
30
6.6 Displaying specifications of the combination electrode
Displaying asymmetry
✱ Press the key twice in an interval of approx. 1 second.
Displaying slope at 25 °C
✱ Briefly press the key three times in an interval of approx. 1 second.
less than 30 %: The combination electrode is severely aged or contami-
nated.
If there is no improvement after cleaning (see chapter 11.2
"Cleaning", page 50) and subsequent calibration, the combination electrode must be replaced.
NOTE!
During the evaluation, both the asymmetry and the slope of the combination
electrode are considered.
The asymmetry of the pH combination electrode is
displayed for approximately 3 seconds.
Example: asymmetry -30 mV
Admissible range: ±55 mV
Optimal: 0 mV
rH mV mVHpH
ATC o k AL Logg pH
CAL
NOTE!
Contamination can cause the asymmetry of the combination electrode to
deteriorate significantly.
The slope of the pH combination electrode is displayed for approximately 3 seconds.
Example: slope -52.9 mV/pH
Admissible range: -62 to -45 mV/pH
Optimal: -59.2 mV/pH
rH mV mVHpH
ATC o k AL Logg pH
CAL
31
6 Calibration of the pH combination electrode
6.7 Error messages of the pH calibration
NOTE!
After prior 2 point calibration, the slope for the entire measuring range is
displayed (SL.).
After prior 3 point calibration, the slope for the acidic range is displayed
first (SL. 1). After pressing the key again, the slope for the alkaline range
(SL. 2) is displayed.
Display Cause Remedy
The neutral buffer is not admissible:
• Combination electrode is defective
Clean combination electrode, recalibrate.
If error reoccurs:
replace combination electrode
• Wrong buffer solution Always use neutral buffer as first solution (exception: 1 point calibration)
• Buffer solution used up Use new buffer solution
The slope is too low:
• Combination electrode is defective
• Buffer solution used up
Replace combination electrode
Use new buffer solution
The slope is too high:
• Combination electrode is defective
• Buffer solution used up
Replace combination electrode
Use new buffer solution
Wrong calibration temperature Only carry out calibration between 0 and 60 °C
32
7 Calibration of the measuring inputs
7.1 Offset/zero point correction and slope correction of the
voltage input and the temperature input
A zero point correction or slope correction of both the voltage input and the
temperature input can be carried out using the parameters "OFFS" (See page
42) and "SCAL" (See page 43).
Reliable references (e.g. ice water, controlled precision water baths, or similar)
must be available for this purpose.
If a correction has been carried out (deviation from the default setting), this is
indicated with the message "Corr" when the device is switched on.
The default setting of the zero point and slope values is: "oFF" = 0.0, i.e. no
correction performed.
Effect of the correction on the voltage/temperature display
Correction type Device display
Offset/zero point correction Measured value – "OFFS"
Offset/zero point correction and
slope correction
(measured value – "OFFS") × (1+ "SCAL"/100)
33
8 Device settings
8.1 Calling up the setting menu
Overview of the setting menu
The setting menu is called up from measurement mode by pressing the
key for at least 2 seconds (main display "SEt").
The 4 individual submenus in the setting menu are then selected by repeatedly
pressing the key.
Measuring (1) Display in measurement mode
Configuring
the device
(2) General settings, See page 34
Parameterizing
the device
(3) Offset/zero point correction and slope correction of the voltage
input and the temperature input, See page 41
(4) Settings for the real-time clock, See page 43
Providing
information
(5) Read calibration data, See page 46
6
Store
Quit
6
Store
Quit
6
Store
Quit
4
Set
Menu
6
Store
Quit
> 2 s> 2 s
()
(1)
rH mV mVHpH
ATC ok AL Logg pH
CAL
rH mV mVHpH
ATC ok AL Logg pH
CAL
rH mV mVHpH
ATC ok AL Logg pH
CAL
rH mV mVHpH
ATC ok AL Logg pH
CAL
rH mV mVHpH
ATC ok AL Logg pHCAL
4
Set
Menu
4
Set
Menu
4
Set
Menu
4
Set
Menu
(3)
(4)
(5)
NOTE!
If no keys are pressed for over 2 minutes, the device setting is aborted.
Any changes made up to this point will not be saved!
8 Device settings
34
8.2 Resetting to default settings
8.3 Configuring the device
8.3.1 Submenu "SEt ConF": general settings
Overview of the parameters
After calling up the setting menu with and selecting the submenu "SEt
ConF", use the key to select the parameter to be configured.
NOTE!
If the and keys are pressed simultaneously for over 2 seconds, the
device is reset to the default settings.
CAL
3
(1)
(8)
(9)
(10)
rH mV mVHpH
ATC ok AL Logg pH
CAL
pH
HLD
(2)
(3)
(4)
(5) (6)
(7)
NOTE!
Certain parameters can only be accessed when certain device settings have
been made.
Parameters
(1) "InP": selection of a measurand, See page 35
(2) "rES pH": resolution of the pH display, See page 36
(3) "CAL": selection of the number of calibration points, See page 36
35
8 Device settings
Parameter "InP": selection of a measurand
✱ Select the desired measurand with the and keys:
✱ Press the key to save the setting and move to the next parameter or
✱ press the key to save the setting and move to the next submenu of the
setting menu or
✱ press the key to save the setting, quit the device settings, and return to
measurement mode.
(4) "CAL.P": selection of the buffer series, See page 37
(5) "C.int": calibration timer, See page 37
(6) "Unit t": temperature unit °C/°F, See page 38
(7) "Auto HLD": automatic saving of a measured value, See page 38
(8) "P.oFF": automatic device switch-off, See page 39
(9) "Out": universal output, See page 39
(10) "Adr.": universal output
Parameters
NOTE!
In the following list of parameters, the setting options for the default setting
are shown in bold in each case.
Menu/parameter Setting option Meaning
Arrow "rH" Measuring (detecting) the rH value
Arrow "mV" Measuring the redox potential
Arrow "mV
H
" Measuring the redox potential with refe-
rence to the hydrogen system
Arrow "pH" Measuring the pH value
rH mV mVHpH
ATC o k AL Logg pH
CAL
8 Device settings
36
Parameter "rES pH": resolution of the pH display
The parameter "rES pH" can only be accessed when the "pH" measurand has
been selected.
✱ Use the and keys to set the resolution:
✱ Press the key to save the setting and move to the next parameter or
✱ press the key to save the setting and move to the next submenu of the
setting menu or
✱ press the key to save the setting, quit the device settings, and return to
measurement mode.
Parameter "CAL": selection of the number of calibration points
The parameter "CAL" can only be accessed when the "pH" measurand has
been selected.
✱ Use the and keys to set the number of calibration points:
✱ Press the key to save the setting and move to the next parameter or
✱ press the key to save the setting and move to the next submenu of the
setting menu or
✱ press the key to save the setting, quit the device settings, and return to
measurement mode.
Menu/parameter Setting option Meaning
0.1 Resolution in tenths pH
0.01 Resolution in hundredths pH
rH mV mVHpH
ATC o k AL Logg pH
CAL
Menu/parameter Setting option Meaning
1-Pt 1 point calibration
(only offset, slope -59.2 mV/pH)
2-Pt 2 point calibration
(neutral + one further buffer)
3-Pt 3 point calibration
(neutral + one acidic + one alkaline buffer)
rH mV mVHpH
ATC o k AL Logg pH
CAL
37
8 Device settings
Parameter "CAL.P": selection of the buffer series
The parameter "CAL.P" can only be accessed when the "pH" measurand has
been selected.
✱ Use the and keys to select the desired buffer series:
✱ Press the key to save the setting and move to the next parameter or
✱ press the key to save the setting and move to the next submenu of the
setting menu or
✱ press the key to save the setting, quit the device settings, and return to
measurement mode.
Parameter "C.int": calibration timer
✱ Use the and keys to set the calibration timer:
✱ Press the key to save the setting and move to the next parameter or
✱ press the key to save the setting and move to the next submenu of the
setting menu or
✱ press the key to save the setting, quit the device settings, and return to
measurement mode.
Menu/parameter Setting option Meaning
GPH Technical buffer series (capsules),
pH 4|7|10
PHL Technical buffer series (liquid buffer),
pH 4|7|10
din DIN 19266 buffer series,
pH 1.68(A)|4.01(C)|6.87(D)|9.18(F)|12.45(G)
Edit any buffer, manual setting
rH mV mVHpH
ATC o k AL Logg pH
CAL
Menu/parameter Setting option Meaning
1 to 365 Time interval for calibration timer in days
oFF No calibration timer
rH mV mVHpH
ATC o k AL Logg pH
CAL
8 Device settings
38
Parameter "Unit t": temperature unit °C/°F
✱ Use the and keys to select the temperature unit:
✱ Press the key to save the setting and move to the next parameter or
✱ press the key to save the setting and move to the next submenu of the
setting menu or
✱ press the key to save the setting, quit the device settings, and return to
measurement mode.
Parameter "Auto HLD": automatic saving of a measured value
✱ Use the and keys to activate or deactivate automatic saving of a
measured value:
✱ Press the key to save the setting and move to the next parameter or
✱ press the key to save the setting and move to the next submenu of the
setting menu or
✱ press the key to save the setting, quit the device settings, and return to
measurement mode.
Menu/parameter Setting option Meaning
°C All temperatures stated in degrees Cel-
sius
°F All temperatures stated in degrees Fahren-
heit
rH mV mVHpH
ATC o k AL Logg pH
CAL
Menu/parameter Setting option Meaning
on Automatic saving of a stable measured
value (Auto Hold)
oFF Standard hold function at the push of a
button (see chapter 4.2 "Control elements", page 13)
rH mV mVHpH
ATC o k AL Logg pH
HLD
CAL
39
8 Device settings
Parameter "P.oFF": automatic device switch-off
✱ Use the and keys to set the switch-off delay:
✱ Press the key to save the setting and move to the next parameter or
✱ press the key to save the setting and move to the next submenu of the
setting menu or
✱ press the key to save the setting, quit the device settings, and return to
measurement mode.
Parameter "Out": universal output
✱ Use the and keys to deactivate the output:
✱ Press the key to save the setting and move to the next submenu of the
setting menu or
✱ press the key to save the setting, quit the device settings, and return to
measurement mode.
Menu/parameter Setting option Meaning
1to
20 to
120
Switch-off delay in minutes.
If no key is pressed, the device switches off
automatically once this period of time has
elapsed
oFF Automatic switch-off deactivated
(permanent operation)
NOTE!
The functions of the universal output are not supported by this device. The
output should always be deactivated in order to minimize the power consumption of the device.
Menu/parameter Setting option Meaning
oFF Interface deactivated.
Minimizes the power consumption of the
device
SEr Interface activated.
Not supported in this device; increases
the power consumption of the
device!
dAC
8 Device settings
40
8.3.2 Submenu "SEt Out": serial interface settings
Overview of the parameters
After calling up the setting menu with and selecting the submenu "SEt
Out", use the key to select the parameter to be configured.
Parameter "Out": serial interface
✱ Use the and keys to deactivate the interface:
✱ Press the key to save the setting and move to the next submenu of the
setting menu or
✱ press the key to save the setting, quit the device settings, and return to
measurement mode.
CAL
3
SAL mg/l kOhm mS µS
Lin nLF AL Logg %/K 1/cm
NOTE!
The functions of the serial interface are not supported in this device. The
interface should always be deactivated in order to minimize power consumption.
Menu/parameter Setting option Meaning
oFF Interface deactivated.
Minimizes the power consumption of the
device
Ser Interface activated.
Not supported in this device; increases
the power consumption of the
device!
41
8 Device settings
8.4 Parameterizing the device
8.4.1 Submenu "SEt Corr": offset/zero point correction and slope correction of the voltage and temperature measurement
Overview of the parameters
After calling up the setting menu with and selecting the submenu
"SEt Corr", use to select the parameter to be configured.
Parameter "OFFS": offset/zero point correction of the voltage measurement
✱ Use the and keys to set the zero point correction:
✱ Press the key to save the setting and move to the next parameter or
✱ press the key to save the setting and move to the next submenu of the
setting menu or
✱ press the key to save the setting, quit the device settings, and return to
measurement mode.
Parameters
(3) "OFFS mV": offset/zero point correction of the voltage measurement, See
page 41
(4) "SCAL mV": slope correction of the voltage measurement, See page 42
(3) "OFFS °C": offset/zero point correction of the temperature measurement, See
page 42
(4) "SCAL °C": slope correction of the temperature measurement, See page 43
CAL
3
(1)
(2)
rH mV mVHpH
ATC ok AL Logg pH
CAL
mV
mV
(4)
(3)
Menu/parameter Setting option Meaning
oFF no zero point correction of the voltage
measurement
-
10.0 to +10.0 m
V
zero point correction of the
voltage measurement in mV
rH mV mVHpH
ATC o k AL Logg pH
CAL
8 Device settings
42
Parameter "SCAL": slope correction of the voltage measurement
✱ Use the and keys to set the slope correction:
✱ Press the key to save the setting and move to the next parameter or
✱ press the key to save the setting and move to the next submenu of the
setting menu or
✱ press the key to save the setting, quit the device settings, and return to
measurement mode.
Parameter "OFFS": offset/zero point correction of the temperature measurement
✱ Use the and keys to set the zero point correction:
✱ Press the key to save the setting and move to the next parameter or
✱ press the key to save the setting and move to the next submenu of the
setting menu or
✱ press the key to save the setting, quit the device settings, and return to
measurement mode.
Menu/parameter Setting option Meaning
oFF no slope correction of the voltage mea-
surement
-5.0 to 5.0 slope correction of the voltage measurement in %
rH mV mVHpH
ATC o k AL Logg pH
CAL
Menu/parameter Setting option Meaning
oFF No zero point correction of the
temperature measurement
-5.0 to +5.0°C Zero point correction of the
temperature measurement in °C
-9.0 to +9.0°F Zero point correction of the
temperature measurement in °F
rH mV mVHpH
ATC o k AL Logg pH
CAL
43
8 Device settings
Parameter "SCAL": slope correction of the temperature measurement
✱ Use the and keys to set the slope correction:
✱ Press the key to save the setting and move to the next parameter or
✱ press the key to save the setting and move to the next submenu of the
setting menu or
✱ press the key to save the setting, quit the device settings, and return to
measurement mode.
8.4.2 Submenu "SEt CLOC": setting the real-time clock
Overview of the parameters
After calling up the setting menu with and selecting the submenu
"SEt CLOC", use to select the parameter to be configured.
Menu/parameter Setting option Meaning
oFF No slope correction of the
temperature measurement
-5.0 to 5.0 Slope correction of the
temperature measurement in %
rH mV mVHpH
ATC o k AL Logg pH
CAL
Parameters
(1) "CLOC": setting the time, See page 44
(2) "YEAr": setting the year, See page 44
(3) "dAtE": setting the date, See page 45
CAL
3
(1)
(2)
(3)
rH mV mVHpH
ATC ok AL Logg pH
CAL
8 Device settings
44
Parameter "CLOC": setting the time
✱ Use the and keys to set the time:
✱ Press the key to save the setting and move to the next parameter or
✱ press the key to save the setting and move to the next submenu of the
setting menu or
✱ press the key to save the setting, quit the device settings, and return to
measurement mode.
Parameter "YEAr": setting the year
✱ Use the and keys to set the year:
✱ Press the key to save the setting and move to the next parameter or
✱ press the key to save the setting and move to the next submenu of the
setting menu or
✱ press the key to save the setting, quit the device settings, and return to
measurement mode.
Menu/parameter Setting option Meaning
HH:MM Hours (HH) and minutes (MM)
Press the
/ keys to set the time in incre-
ments of 1 minute
Press and hold the / keys to continu-
ously move through the time setting; press
and hold for an extended period to move in
increments of 10 minutes
rH mV mVHpH
ATC o k AL Logg pH
CAL
Menu/parameter Setting option Meaning
YYYY 4-digit year
rH mV mVHpH
ATC o k AL Logg pH
CAL
45
8 Device settings
Parameter "dAtE": setting the date
✱ Use the and keys to set the date:
✱ Press the key to save the setting and move to the next parameter or
✱ press the key to save the setting and move to the next submenu of the
setting menu or
✱ press the key to save the setting, quit the device settings, and return to
measurement mode.
8.4.3 Submenu "rEAd CAL.": reading the calibration data
The reading of the calibration data is described separately, see chapter 9.1.2
"Reading the calibration data ("rEAd CAL")", page 46.
Menu/parameter Setting option Meaning
DD:MM Days (DD) and months (MM)
rH mV mVHpH
ATC o k AL Logg pH
CAL
46
9 Maintenance
9.1 Good laboratory practice (GLP)
Good laboratory practice involves regularly monitoring the device and the
accessories. In the case of pH measurements, the correct pH calibration must
be ensured in particular. The device provides support in this regard with the
functions "C.int" (calibration timer) and "rEAD CAL" (calibration data display).
A prerequisite for applying the GLP functions is ensuring that the combination
electrode is not changed. The data is saved in the device, but refers to the
respective combination electrode.
9.1.1 Calibration timer ("C.int")
You can enter a fixed interval upon which the device will automatically remind
you that a new calibration needs to be performed, see "Parameter "C.int": calibration timer", page 37.
The length of the interval depends on your application and the stability of the
combination electrode.
Once the interval has elapsed, "CAL" flashes in the display.
9.1.2 Reading the calibration data ("rEAd CAL")
The last calibration is stored in the device with the date and calibration values
and can be called up as follows.
✱ Press the key for at least 2 seconds.
"Set ConF" appears in the display.
✱ Keep pressing the key until "rEAd CAL." appears in the display.
✱ Briefly press the key to switch the display between:
"CAL." and "U.ASY" are displayed alternately in the main display.
The value of the asymmetry voltage in mV is shown in the
subsidiary display.
"Cal." and "SL.1" are displayed alternately in the main display.
The slope in the acidic range in mV/pH is shown in the subsidiary display.
1
"Cal." and "SL.2" are displayed alternately in the main display.
The slope in the alkaline range in mV/pH is shown in the subsidiary display.
1
rH mV mVHpH
ATC o k AL Logg pH
CAL
rH mV mVHpH
ATC o k AL Logg pH
CAL
rH mV mVHpH
ATC o k AL Logg pH
CAL
47
9 Maintenance
✱ Press the key to stop reading the calibration data.
9.2 Real-time clock ("CLOC")
The real-time clock is required for the chronological assignment of the calibration. You should therefore check the settings as required, particularly after
replacing the battery.
The date of the last calibration is shown in the main display.
The time of the last calibration is shown in the subsidiary dis-
play.
1
With the 1 point calibration, the acidic slope = the alkaline slope = -59.16 mV/pH is assumed.
With the 2 point calibration, the acidic slope = the alkaline slope.
With the 3 point calibration, independent acidic and alkaline values are determined.
rH mV mVHpH
ATC o k AL Logg pH
CAL
48
10 Error and system messages
Error messages during measurement
Error messages during calibration
Display Cause Remedy
Battery voltage low,
the function can still be guaranteed only
for a short time.
Insert new battery
Battery is used up Insert new battery
During mains operation: incorrect voltage
Test power supply unit, replace if necessary
No display or
muddled characters, device does
not respond to
keys being
pressed
Battery voltage too low Insert new battery
During mains operation: power supply
unit defective or incorrect voltage/polarity
Test power supply unit, replace if necessary
System error Remove battery or power supply unit, wait
briefly before reconnecting
Device error/device defect Send in device for repair
Measuring range exceeded
Check if the measured value is above the admissi-
ble measuring range of the combination electrode
Combination electrode is defective Send in device for repair
Measuring range not reached
Check if the measured value is above the admissi-
ble measuring range of the combination electrode
Combination electrode is defective Send in device for repair
System error Send in device for repair
Measuring range exceeded or not
reached by a significant margin
Check whether the measured value is within
the admissible measuring range of the combi-
nation electrode
Preset calibration interval elapsed
Calibrate device
Last calibration invalid
Display Cause Remedy
The neutral buffer is not admissible:
• Combination electrode is defective
Clean combination electrode, recalibrate.
If error reoccurs: replace combination elec-
trode
• Wrong buffer solution Always use neutral buffer as first solution
(exception: 1 point calibration).
• Buffer solution used up Use new buffer solution
The slope is too low:
• Combination electrode is defective
• Buffer solution used up
Replace combination electrode
Use new buffer solution
The slope is too high:
• Combination electrode is defective
• Buffer solution used up
Replace combination electrode
Use new buffer solution
Wrong calibration temperature Only carry out calibration between
0 and 60 °C
49
11 The pH combination electrode
Problem cases
• with solutions containing protein, such as those used for measurements in
the medical and biological sector, KCl can result in the denaturation of the
protein
• coagulated coatings
• solutions that contain relatively high concentrations of silver ions
• ion-deficient solutions (de-ionized or ultra-pure water)
• solutions containing a solvent
If measurements are to be taken in these or similar solutions, we advise determining the pH value as quickly as possible so as to avoid unnecessary strain
on the combination electrode.
After the measurement, the combination electrode must be cleaned and
stored in either a KCl storage container or with a watering cap.
Substances that are deposited on the measuring membrane or the diaphragm
have an effect on the measurement and must be removed regularly. This can
be done, for example, using an automatic cleaning device.
11.1 pH combination electrodes for different areas of application
NOTE!
pH combination electrodes are wearing parts that need to be replaced after
chemical and mechanical exposure when the required values can no longer
be obtained, even after thorough cleaning.
When in use, it is important to remember that various substances (for example, hydrofluoric acid (HF)) corrode glass in aqueous solutions. Chemicals
can react with the KCl electrolyte in the combination electrode and/or cause
a blockage of the diaphragm
.
Area of application pH combination electrode -
version, type, part no.
Drinking water monitoring, aquariums, fish
breeding, lake and sea water, etc.
Type 201005/65-18-45-2000-76-120/837,
2 m fixed cable connection and BNC connector,
part no. 00417300
Generally aqueous media, beverage industry, company laboratory, chemistry, etc.
Type 201030/76-10-07-40-1000-76-120/000, KClfilled, 1 m fixed cable connection and BNC connector
part no. 00300196
In the food industry for insertion measurements in sausage, meat, cheese, fruit,
pasta products, and other semi-solid food,
soil measurements, small liquid samples,
etc.
Type 201030/60-15-08-40-1000-76-120/052,
insertion electrode, plastic version,
solid electrolyte gel, 1 m fixed cable connection and
BNC connector,
part no. 00448527
Industrial and municipal wastewater, electroplating plants, paint shops, generally
contaminated media, etc.
Type 201030/51-18-07-40-2000-76-120/052, 837,
2 m fixed cable connection and BNC connector,
part no. 00532380
11 The pH combination electrode
50
11.2 Cleaning
The ion-sensitive glass membrane of the combination electrode can be rinsed
under lukewarm water. More severe pollutants can be removed using a soft
cloth and a mild household detergent.
Never clean combination electrodes with abrasive cleaning agents (scouring
powder, scouring cream, etc.) or with a scouring pad!
Deposits containing protein on the sensor part of the combination electrode
can be cleaned by being immersed in 0.1 molar of hydrochloric acid solution
(HCI) for at least 5 minutes. A protein cleaning agent (pepsin solution) can also
be employed.
11.3 Operating life
The operating life of combination electrodes depends on the operating conditions. Under normal conditions and with appropriate maintenance, the operating life is at least 6 months.
11.4 General handling of pH combination electrodes
Combination electrodes should be stored in a dry place at a temperature
between 10 °C and 30 °C. Below 0 °C, the combination electrode can be
destroyed due to freezing of the electrolyte!
The sensor part of the combination electrode should be protected against drying out by using a protective cap filled with 3 molar KCl solution or a storage
holder. Lengthy storage in de-ionized (distilled) water will result in a depletion
of the KCl within the combination electrode.
Air bubbles in the membrane ball can be removed by a sharp flicking action
(like flicking a glass thermometer).
Filling up the electrolyte is not required or possible with these combination
electrodes (low-maintenance).
Before measuring and after every measurement in different media, the combination electrode must be carefully rinsed with de-ionized (distilled) water.
Clean the combination electrode after use. For pollutants containing protein,
pepsin hydrochloric acid solution (part no. 00307114) is recommended.
If the measuring function of the combination electrode has been impaired (for
example, if the display reacts very slowly):
• Check the combination electrode for air bubbles
• Function test with a second reference combination electrode
• Replace combination electrode
Solutions for calibration, cleaning, and activation can be obtained from laboratory suppliers.
51
12 The redox combination electrode
12.1 General handling
Combination electrodes should be stored in a dry place at a temperature
between 10 °C and 30 °C. Below 0 °C, the combination electrode can be
destroyed due to freezing of the electrolyte!
The sensor part of the combination electrode should be protected against drying out by using a protective cap filled with 3 molar KCl solution or a storage
holder. Lengthy storage in de-ionized (distilled) water will result in a depletion
of the KCl within the combination electrode.
Filling up the electrolyte is not required or possible with these combination
electrodes (low-maintenance).
Before measuring and after every measurement in different media, the combination electrode must be carefully rinsed with de-ionized (distilled) water.
Clean the combination electrode after use. For pollutants containing protein,
pepsin hydrochloric acid solution (part no. 00307114) is recommended.
The platinum tip of the sensor can be cleaned with ordinary scouring powder
(rinse well afterward).
If the combination electrode malfunctions:
• Function test with a second reference combination electrode
• Replace combination electrode
Solutions for calibration, cleaning, and activation can be obtained from laboratory suppliers.
Recommended redox combination electrodes
Reference system: Ag/AgCl, electrolyte: KCl, 3 mol/l
Type: 201010/65-22-65-2000-76-120/837, 2 m fixed cable connection
and BNC connector
Part no. 00424950
Use only this type when converting to hydrogen system "mV
H
" and rH mea-
surements!
Operating life
The operating life of combination electrodes depends on the operating conditions. Under normal conditions and with appropriate maintenance, the operating life is at least 6 months.
CAUTION!
The manual measuring device is designed for using electrodes with the Ag/
ACl (silver/silver chloride) reference system.
If using other types, the measuring function mV
H
will yield incorrect measure-
ment results.
52
13 Returns and disposal
13.1 Returns
13.2 Disposal
DANGER!
All devices that are returned to the manufacturer must be free from measuring
material residue and other hazardous substances. Measuring material residue
on the case or on the sensor may pose a hazard to persons or the environment.
NOTE!
Use suitable transport packaging when returning the device, especially if the
device is still functioning.
Ensure that the device is protected by sufficient insulation material in the
packaging.
DISPOSAL!
Hand in empty batteries at the corresponding collection points.
Do not dispose of the device in the household waste. Should the device need
to be disposed of, please send this directly to us (with the sufficient postage).
We will dispose of the device in a proper and environmentally friendly manner.
53
14 Technical data
Measuring ranges
Accuracy
Connections
Input resistance
pH calibration
Display
Additional functions
Housing
pH 0.00 to 14.00 pH
Redox voltage (mV)
Redox voltage (mV
H
)
-1999 to +2000 mV
-1792 to +2207 mVH (referring to hydrogen system, at 25 °C, DIN 38404)
rH 0.0to70.0rH
Temperature -5.0 to +150.0 °C, Pt1000
23.0 to 302.0 °F
pH ±0.01 pH
Redox voltage ±0.1 % FS
Temperature ±0.2 K (in the range of -5 to +100 °C)
pH, redox BNC socket
Additional connection for reference electrode: banana socket (4 mm)
Temperature Pt1000 via banana sockets (4 mm)
pH, redox >10
12
Ω
Automatic 1, 2, or 3 point calibration,
either DIN 19266 buffer or technical buffer GPH/PHL
Manual 1, 2, or 3 point calibration
2 4-digit, 7-segment LCD displays (main display 12.4 mm high, subsidiary display 7 mm high)
with additional symbols.
Calibration memory Adjustable calibration intervals (1 to 365 days, CAL warning after expiry)
Min./max. memory Maximum and minimum value for conductivity are saved together with the
temperature at which the extreme value occurred
Hold function Standard hold function at the push of a button or Auto Hold
Auto-off function If activated, the device switches off automatically if it is not operated for an
extended period of time (select period between 1 and 120 min)
Material ABS, break-proof
Protection type IP65 (front)
Dimensions 142 × 71 × 26 mm (L × W × H without BNC socket)
Ambient temperature -25 to +50 °C; 0 to 95% relative humidity (non-condensing)
Storage temperature -25 to +70 °C
Weight approx. 170 g (including battery)
14 Technical data
54
Power supply
EMC
Scope of delivery
Battery operation 9 V battery, type IEC 6F22 (included in scope of delivery)
Mains operation External power supply unit (DC 10.5 to 12 V) with coaxial power connector,
exterior Ø 5.5 mm (-),
inner pin Ø 1.9 mm (+) (not included in scope of delivery)
Current consumption <1 mA (with serial interface switched off)
Battery display "
" and "bAt" displayed automatically when battery is used up
The device complies with the significant protection requirements defined in the Directive of the Council on
the approximation of the laws of the Member States relating to electromagnetic compatibility (2004/108/
EC). Additional error: <1%.
Part no. 00454356 Manual measuring device type 202710/30, 9 V battery, operating manual
Part no. 00454357 Manual measuring device type 202710/30, 9 V battery, operating manual,
carry case
55
15 China RoHS
żżżżżż
;żżżżż
żżżżżż
ż
ℶ❐兓Ⓔ
3URGXFWJURXS
ℶ❐₼㦘⹂䓸德䤓⚜䱿♙⚺摞
&KLQD((3+D]DUGRXV6XEVWDQFHV,QIRUPDWLRQ
捷ↅ⚜䱿
&RPSRQHQW1DPH
杔
᧤3E᧥
㻭
᧤+J
柘
᧤&G᧥
⏼ↆ杻
᧤&U9,᧥
⮩䅃勣啾
᧤3%%᧥
⮩䅃ℛ啾搩
᧤3%'(᧥
ཆ༣
+RXVLQJ
*HKlXVH
䗷〻䘎᧕
3URFHVVFRQQHFWLRQ
3UR]HVVDQVFKOXVV
㷪⇽
1XWV
0XWWHU
㷪ṃ
6FUHZ
6FKUDXEH
żżżżż
㦻嫷㫋∬㗽^:dϭϭϯϲϰ䤓屓⸩冥Ⓟᇭ
7KLVWDEOHLVSUHSDUHGLQDFFRUGDQFHZLWKWKHSURYLVLRQV6-7
ż᧶嫷䯉年㦘⹂䓸德⦷年捷ↅ㓏㦘⧖德㧟㠨₼䤓⚺摞⧖⦷*%7屓⸩䤓棟摞尐㻑ⅴₚᇭ
,QGLFDWHWKHKD]DUGRXVVXEVWDQFHVLQDOOKRPRJHQHRXVPDWHULDOV¶IRUWKHSDUWLVEHORZWKHOLPLWRIWKH
*%7
î᧶嫷䯉年㦘⹂䓸德咂⺠⦷年捷ↅ䤓㩟⧖德㧟㠨₼䤓⚺摞怔⒉*%7屓⸩䤓棟摞尐㻑ᇭ
,QGLFDWHWKHKD]DUGRXVVXEVWDQFHVLQDWOHDVWRQHKRPRJHQHRXVPDWHULDOV¶RIWKHSDUWLVH[FHHGHGWKH
OLPLWRIWKH*%7
15 China RoHS
56
JUMO GmbH & Co. KG JUMO Instrument Co. Ltd. JUMO Process Control, Inc.
Street address:
Moritz-Juchheim-Straße 1
36039 Fulda, Germany
Delivery address:
Mackenrodtstraße 14
36039 Fulda, Germany
Postal address:
36035 Fulda, Germany
Phone: +49 661 6003-0
Fax: +49 661 6003-607
Email: mail@jumo.net
Internet: www.jumo.net
JUMO House
Temple Bank, Riverway
Harlow, Essex, CM20 2DY, UK
Phone: +44 1279 63 55 33
Fax: +44 1279 62 50 29
Email: sales@jumo.co.uk
Internet: www.jumo.co.uk
6733 Myers Road
East Syracuse, NY 13057, USA
Phone: +1 315 437 5866
Fax: +1 315 437 5860
Email: info.us@jumo.net
Internet: www.jumousa.com
Loading...