XS Instruments 7 Vio User manual

1
Rev. 1.0 30.01.2020
EN
7 Vio
INSTRUCTIONS MANUAL
pH - Cond - PC

2
Rev. 1.0 30.01.2020
EN

3
Rev. 1.0 30.01.2020
EN
Index
Introduction.............................................................................................................................................5
2. Safety information .......................................................................................................................................6
•Definition of warning words and symbols...........................................................................................6
•Reporting terms: .................................................................................................................................6
•Additional documents for safety ........................................................................................................7
•Use according to destination...............................................................................................................7
•Basic requirements for a safe use .......................................................................................................7
•Unauthorized use ................................................................................................................................7
•Device maintenance............................................................................................................................7
•Responsibility of the owner of the instrument ...................................................................................8
Instrumental features..............................................................................................................................8
•Parameters ..........................................................................................................................................8
•Datasheet ............................................................................................................................................9
Instrument description..........................................................................................................................10
•Display ...............................................................................................................................................10
•Keyboard ...........................................................................................................................................10
•LED.....................................................................................................................................................11
Installation.............................................................................................................................................11
•Supplied components........................................................................................................................11
•Start-up..............................................................................................................................................11
•Turning On and Off............................................................................................................................11
•Replacement of batteries..................................................................................................................12
•Instrument transportation ................................................................................................................12
•Key functions.....................................................................................................................................12
•Inputs / Outputs connections ...........................................................................................................13
•Symbols and icons on the display .....................................................................................................13
Operation of the device.........................................................................................................................14
Setup Menu ..........................................................................................................................................15
•Setup Menu Structure .....................................................................................................................16
Temperature measurement ATC – MTC ...............................................................................................17
pH Parameter ........................................................................................................................................17
•pH parameter Setup..........................................................................................................................17
•Composition of the setup Menu for pH parameter ..........................................................................17
•Automatic pH calibration ..................................................................................................................19
•Calibration with manual values ........................................................................................................20
•Performing pH measurement ...........................................................................................................21
•Sensors with DHS technology ...........................................................................................................21
•Errors during calibration ..................................................................................................................22

4
Rev. 1.0 30.01.2020
EN
mV Parameter ......................................................................................................................................22
ORP Parameter (Redox Potential) ...................................................................................................22
•ORP Parameter Setup .......................................................................................................................23
•Composition of the setup Menu for the ORP Parameter..................................................................23
•ORP automatic calibration ...............................................................................................................23
Conductivity Parameter ..............................................................................................................24
•…how to get Conductivity? ...............................................................................................................24
•Setup for Conductivity Parameter ...................................................................................................24
•Automatic Cond calibration ..............................................................................................................27
•Manual COND calibration ................................................................................................................29
•Errors during calibration ...................................................................................................................29
•Performing Conductivity measurement ..........................................................................................30
TDS Parameter .................................................................................................................................30
Instrument Setup menu ..................................................................................................................31
•Composition of the setup menu for Setting Menu ...........................................................................31
Warranty ...........................................................................................................................................33
•Warranty period and limitations .......................................................................................................33
Disposal of electrical devices ............................................................................................................33
XS Instruments
Via della Meccanica n.25 41012 Carpi (MO) ITALY
Tel. [phone] Fax [phone]
www.xsinstruments.com

5
Rev. 1.0 30.01.2020
EN
Introduction
XS Instruments, globally recognized as a leading brand in the field of electrochemical measurements, has
developed this new line of portable instruments completely produced in Italy, finding the perfect balance
between performance, attractive design and ease of use.
The robustness and integrity of the case, the integrated brightness sensor and the practical carrying case
make this instrument ideal for measurements directly in the field.
Thanks to the triple power supply and the ability to manually change the contrast and brightness of the
display, this instrument is also suitable for use in the laboratory.
The innovative high definition colour LCD display shows all the necessary information, such as the
measurement, the temperature, the buffers used for the last calibration (also custom), the condition of
stability.
Everyone can use these tools thanks to the instructions that appear directly on the display. The calibration
is guided step by step and the instrument configuration menu is easy to consult. In addition, a LED
indicates the status of the system to the user.
Up to 3 pH calibration points can be carried out between 8 automatically recognized values and 5 points
for Conductivity; in addition, buffers chosen by the operator can be used.
It is also possible to perform mV calibration for Redox sensors.
For an accurate measurement of the conductivity value, it is possible to work with 3 different cell
constants and to modify the compensation coefficient and the reference temperature.
It is possible to consult the calibration data anytime and the representation makes the calibration process
more efficient, through the icons of the buffers used.
The ideal solution for an accurate and precise measurement is to use an XS Sensor electrochemical
electrode with an XS Instruments device and perform the calibrations with XS Solution certified
calibration solutions.

6
Rev. 1.0 30.01.2020
EN
2. Safety information
•Definition of warning words and symbols
This manual contains extremely important safety information, in order to avoid personal injury, damage to
the instrument, malfunctions or incorrect results due to failure to comply with them. Read entirely and
carefully this manual and be sure to familiarize with the tool before starting to work with it.
This manual must be kept near to the instrument, so that the operator can consult it easily, if necessary.
Safety provisions are indicated with warning terms or symbols.
•Reporting terms:
ATTENTION for a medium-risk hazardous situation, which could lead to serious injury or death, if
not avoided.
ATTENTION for a dangerous situation with reduced risk which can cause material damage, data loss
or minor or medium-sized accidents, if not avoided.
WARNING for important information about the product
NOTEfor useful information about the product
Warning symbols:
Attention
This symbol indicates a potential risk and warns you to proceed with
caution.
Attention
The instrument must be used following the indications of the reference
manual. Read the instructions carefully.
Advice
This symbol draws attention to possible damage to the instrument or
instrumental parts.
Note
This symbol highlights further information and tips.
Attention
This symbol draws attention to a possible danger from electric current.

7
Rev. 1.0 30.01.2020
EN
•Additional documents for safety
The following documents can provide the operator with additional information to work with the measuring
system safely:
•operating manual for electrochemical sensors;
•safety data sheets for buffer solutions and other maintenance solutions (e.g. storage);
•specific notes on product safety.
•Use according to destination
This instrument is designed exclusively for electrochemical measurements both in the laboratory and
directly in the field.
Pay attention to the technical specifications shown in the INSTRUMENT FEATURES / TECHNICAL DATA table;
any other use is to be considered unauthorized.
This instrument has been manufactured and tested in compliance with EN 61010-1 safety standards relating
to electronic instruments and has left the factory in perfect technical and safety conditions (see test report
in each package).
The regular functionality of the device and the operator safety are guaranteed only if all the normal
laboratory safety standards are respected and if all the specific safety measures described in this manual
are observed.
•Basic requirements for a safe use
The regular functionality of the device and the operator safety are guaranteed only if all the following
indications are respected:
•the instrument can be used in accordance with the specifications mentioned above only;
•use the supplied power supply only. If you need to replace the power supply, contact your local
distributor;
•the instrument must operate exclusively in the environmental conditions indicated in this manual;
no part of the instrument can be opened by the user.
Do this only if explicitly authorized by the manufacturer.
•Unauthorized use
The instrument must not run, if:
•it is visibly damaged (for example due to transportation);
it has been stored for a long period of time in adverse conditions (exposure to direct light, heat sources or
places saturated by gas or vapours) or in environments with conditions different from those mentioned in
this manual.
•Device maintenance
If used correctly and in a suitable environment, the instrument does not require maintenance procedures.
It is recommended to occasionally clean the instrument case with a damp cloth and a mild detergent. This
operation must be performed with the instrument off, disconnected from the power supply and by
authorized personnel only.
The housing is in ABS / PC (acrylonitrile butadiene styrene / polycarbonate). This material is sensitive to
some organic solvents, for example toluene, xylene and methyl ethyl ketone (MEK).

8
Rev. 1.0 30.01.2020
EN
If liquids get into the housing, they could damage the instrument.
In case of prolonged non-use of the device, cover the BNC connectors with the special cap.
Do not open the instrument housing: it does not contain parts that can be maintained, repaired or replaced
by the user. In case of problems with the instrument, contact your local distributor.
It is recommended to use original spare parts only. Contact your local distributor for information. The use
of non-original spare parts can lead to malfunction or permanent damage to the instrument. Moreover, the
use of spare parts not guaranteed by the supplier can be dangerous for the user himself.
For the maintenance of the electrochemical sensors, refer to the documentation present in their packaging
or contact the supplier.
•Responsibility of the owner of the instrument
The person who owns and uses the tool or authorizes its use by other people is the owner of the tool and
is responsible for the safety of all users of the tool and third parties.
The owner of the instrument must inform users of the use of the same safely in their workplace and on the
management of potential risks, also providing the required protective devices.
When using chemicals or solvents, follow the manufacturer's safety data sheets.
Instrumental features
•Parameters
pH 7 Vio: pH, mV, ORP, Temp
COND 7 Vio: Cond, TDS, Temp
PC 7 Vio: pH, mV, ORP, Cond, TDS, Temp

9
Rev. 1.0 30.01.2020
EN
•Datasheet
Series 7 Vio
pH
pH 7 Vio - PC 7 Vio
Measuring range
0 … 14
Resolution / Accuracy
0.1, 0.01 / +0.02
Recognized calibration points and
buffers
AUTO: 1…3 / USA, NIST
CUS: 2 user values
Buffers indication
Yes
Calibration report
Yes
Automatic DHS recognition
Yes
Stability filter
Low – Med - High
mV
pH 7 Vio - PC 7 Vio
Range / Resolution
Range: -1000 … +1000 / Resolution: 1
ORP
pH 7 Vio - PC 7 Vio
Calibrations points
1 point / 475 mV
Conductivity
COND 7 Vio - PC 7 Vio
Range / Resolution
0,00 – 20,00 – 200,0 – 2000 μS /
2,00 – 20,00 – 200,0 mS
Automatic scale
Recognized calibration points and
buffers
1…5 / 84, 147, 1413 μS, 12.88, 111.8 mS,
1 user value
Reference temperature
15…30 °C
Temperature coefficient
0,00…10,00 %/°C
TDS
COND 7 Vio - PC 7 Vio
Temperature coefficient
0,1mg/l…200 gr/l / 0.40…1.00
Temperature
pH 7 Vio - COND 7 Vio -PC 7 Vio
Measuring range
0…100 °C
Resolution / Accuracy
0,1 / ± 0,5°C
Temperature compensation ATC
(NTC30KΩ) and MTC
pH: 0…100 °C
Cond: 0…80 °C
System
Display
High definition colours LCD
Brightness and contrast management
Manual
Sleep mode
Yes
Auto-Off
Yes
IP protection
IP 57
Power supply
AA 1,5 V – 3 batteries
Sound level during standard operation
< 80 dB
Environmental operating conditions
0 … +60 °C
Maximum permissible humidity
< 95 % non-condensing
Maximum altitude of use
2000 m
System dimensions
185 x 85 x 45 mm
System weight
400 g
Reference regulations
EMC 2014/30/UE
RoHS 2011/65/EU
EN 61326-1
EN 61010-1

10
Rev. 1.0 30.01.2020
EN
Instrument description
•Display
•Keyboard
Down directional key to scroll through
the menus and values in setup
Enter / Menu key to confirm the chosen values
and enter the setup from the measure mode
Measurement
parameter
Indication of
instrumental
mode
Representation of
buffers used for
calibration
Error symbol
Actual value / Measure unit
Temperature and type of
compensation
ATC - automatic NTC 30KΩ
MTC - manual
DHS connection icon Indication of use of the directional keys
Stability
indicator
Text string
Date and time
Battery charge level
Text string
On-Off button to
switch the device on
and off
Meas / Cal key to return to measure
mode and to start calibration
UP / MODE directional key for scrolling
through menus and values in setup, for
scrolling parameters in measurement

11
Rev. 1.0 30.01.2020
EN
•LED
All the instruments are equipped with a two-colours LED (red and green) which provides the user with
important information on the status of the system:
Function
LED
Description
Power on
Fixed
Power off
Fixed
Standby
Flashing every 20 s
Stable measure
Flashing every 3 s
Errors during calibration
Flashing every 1 s
Errors during measurement
Flashing every 3 s
Selection confirm
Switched on for 1 s
Timed screens
Fixed
DHS deactivation
Fixed
Installation
•Supplied components
The instrument is always supplied inside the specific carrying case; the version without sensor is
always supplied with:
instrument with batteries, 1m S7 / BNC connection cable, NT55 temperature probe, buffer solutions in
single-dose bottle and / or sachet, paper tissues, screwdriver, beaker, electrode holder support -only for
multiparameter- multilingual user manual and test report.
There are versions with the sensor(s) already included. Contact your local distributor to be updated on the
correct composition of the sales kit.
•Start-up
•The device leaves the factory ready to be used by end-user.
•Batteries are included.
•Turning On and Off
Turn on the system by pressing the button . The display initially activates all segments and then
appears:
•model and firmware of the instrument;
•settings relating to the most important parameters and possible information about the DHS sensor;
•the instrument switches on at the last parameter used.
To switch off the instrument, press the key in measure mode.

12
Rev. 1.0 30.01.2020
EN
•Replacement of batteries
The instrument works with 3 AA 1.5V batteries.
To proceed with the replacement:
1. Turn off the instrument.
Turn the instrument over with the display facing down and place it on a stable surface.
It is advisable to put a cloth to avoid any scratching on display.
2. Using the screwdriver supplied, completely unscrew the screw close to the battery symbol.
3. Remove the battery stopper cap with the help of the lanyard.
4. Remove the 3 exhausted batteries (one in the left compartment and two in the right compartment)
and insert the new ones. Pay attention to the correct polarity. Follow the diagram above the battery
symbol in the rear compartment of the instrument.
5. Reinsert the battery holder and tighten the screw.
•Instrument transportation
The instrument is always supplied with the appropriate carrying case. Use the original case only, to transport
the instrument. If you need to buy it again, contact your local distributor.
The interior of the case is shaped to be able to house the instrument and the sensors still connected.
•Key functions
Button
Press
Function
Short
Press to turn the device on or off
Short
•In calibration mode and press to return to measure mode
•In measure mode, press to start the calibration
Short
In measure mode, press to enter the setup
In the setup menus, press to select the desired program and / or value
During calibration, press to confirm the value
Short
In the setup and sub-setup menus press to scroll
In the setup submenus, press to change the value
In MTC and customer calibration mode, press to change the value
Long-Press
(3s)
In measure mode, keep one of the two keys pressed to change the temperature
in MTC mode (manual compensation, without probe). When the value starts to
flash, the user can change the temperature value by entering the correct one and
confirming with .
Short
In measure mode, press to scroll through the different parameters
•pH 7 Vio: pH mV ORP
•COND 7 Vio: Cond TDS
•PC 7 Vio: pH mV ORP Cond TDS

13
Rev. 1.0 30.01.2020
EN
IMPORTANT:
•When the Sleep mode is active (by default after two minutes of inactivity of the instrument) press
any key to reactivate the brightness of the display.
•Only at this point do the keys regain their function.
•Inputs / Outputs connections
Use original accessories guaranteed by the manufacturer only.
If necessary, contact your local distributor.
The BNC connectors are protected by a plastic cap.
Remove the cap before connecting the probes.
.
PC 7 Vio upper panel
READ THE MANUAL BEFORE PROCEEDING TO CONNECT PROBES OR PERIPHERALS
•Symbols and icons on the display
Symbol
Description
Symbol
Description
Press the directional keys to change the
parameter or value on the display
Error in measurement or calibration
DHS digital sensor active Battery charge indication
Measurement stability indicator
The bars scroll if the measurement
is not stable
RCA for pH Temperature
probe
BNC for pH/ORP electrodes
BNC for COND cell
RCA for Cond
Temperature probe

14
Rev. 1.0 30.01.2020
EN
Operation of the device
•After the switching on, the instrument enters measure mode in the last parameter used.
•To scroll through the different parameter screens, press the key ; the current measurement
parameter is shown in the display on the top left (e.g.: ).
Sequence of parameters in measure mode:
pH 7 Vio
COND 7 Vio
PC 7 Vio
pH Conductivity pH
mV TDS mV
ORP ORP
Conductivity
TDS
Note: Pressing the button after the last parameter, the instrument automatically restarts from the
first one.
In the measurement screens for the pH, ORP and Conductivity parameters, press the key to start the
calibration of the active parameter. (next paragraphs).
On the left side of the display, through a string of different colours, it is always indicated how the
instrument is located.
Note: in order to confirm to the user the switching from one mode to another, the string flashes.

15
Rev. 1.0 30.01.2020
EN
String
Meaning
The instrument is in measure mode.
The instrument is in calibration (automatic or manual in relation to
the user's choice).
The user is in the setup mode.
The configuration menus can concern the characteristics of the
parameters or the general setting of the instrument.
Setup Menu
•In measure mode, press the key to enter SETUP mode, select the parameter you want to edit
by using the directional keys and confirming with .
pH 7 Vio
COND 7 Vio
PC 7 Vio
pH SETTINGS COND SETTINGS PH SETTINGS
ORP SETTINGS TDS SETTINGS ORP SETTINGS
SETTINGS SETTINGS COND SETTINGS
TDS SETTINGS
SETTINGS
•Within the selected menu, move between the different programs using the directional buttons and
press the button to access the submenu you want to edit.
•Using the keys and choose the desired option or change the numerical value and confirm
with .

16
Rev. 1.0 30.01.2020
EN
•The value or parameter that is being edited is recognizable as it flashes on the display.
•The icon indicates that the value or parameter to choose is editable using the directional keys.
•Press the key to return to the previous menu.
•Setup Menu Structure
P1.0
pH SETTINGS
P1.1
Buffer Selection
P1.2
Resolution
P1.3
Set Stability criteria
P1.6
View pH Cal
P1.8
Reset pH Setting
P1.9
Temp Cal pH
P2.0
ORP SETTINGS
P2.6
View ORP Cal
P2.8
Reset ORP Setting
P2.9
Temp Cal ORP
P3.0
COND SETTINGS
P3.1
Cell Constant
P3.2
Buffer Selection
P3.3
Reference Temp
P3.4
Temp. Compensation Factor
P3.6
View Cond Cal
P3.8
Reset Cond Setting
P3.9
Temp. Cal Cond
P4.0
TDS SETTING
P4.1
TDS Factor
P9.0
SETTINGS
P9.1
Temperature U.M.
P9.3
Backlight mode
P9.4
Brightness
P9.5
Sleep Mode
P9.6
Setup Parameters
P9.8
Reset
P9.9
Auto Power-Off

17
Rev. 1.0 30.01.2020
EN
Temperature measurement ATC – MTC
•ATC: The direct measurement of the sample temperature for all parameters is carried out through the
NTC 30KΩprobe, which can be either integrated into the sensor (electrode and / or cell) or external.
•MTC: If no temperature probe is connected, the value must be changed manually:
keep pressed or until the value starts to flash; then adjust it by continuing to use the
directional keys; then press to confirm.
pH Parameter
pH 7 Vio; PC 7 Vio
On this series of devices, it is possible to use pH sensors with integrated temperature probe or to connect
two different sensors. Connect the pH electrode to the BNC type connector marked in green. Connect the
temperature probe to the RCA / CINCH Temp connector always marked with a green background.
The instrument is also able to recognize the DHS sensor, an innovative electrode that stores calibration data
and that can be used immediately after on any enabled instrument.
•pH parameter Setup
•In measure mode press to access the SETUP menu.
•Press the button to access the pH SETTINGS P1.0 menu
•Move with the keys and to select the program you want to access.
The table below shows the setup menu structure for the pH parameter, and for each program the options
that the user can choose and the default value:
•Composition of the setup Menu for pH parameter
Program
Description
Options
Factory Default Settings
P1.1
CAL BUFFER SELECT
USA – NIST – Custom
USA
P1.2
SELECT RESOLUTION
0.1 – 0.01
0.01
P1.3
STABILITY CRITERIA
LOW – MEDIUM - HIGH
MED
P1.6
CALIBRATION DATA
-
-
P1.8
RESET SETTINGS
YES – NO
NO
P1.9
TEMPERATURE CAL
YES – NO
-
P1.1 pH buffer selection
•Access this setup to select the buffer family with which to perform the electrode calibration.
Calibration lines from 1 to 3 points can be made.
During calibration, press to exit and save the points calibrated up to that moment
(see calibration paragraph).

18
Rev. 1.0 30.01.2020
EN
The instrument automatically recognizes 2 families of buffers (USA and NIST); in addition, the user has
the option of performing a manual calibration of up to 2 points with customizable values:
USA Buffers: 1,68 - 4,01 - 7,00** - 10,01 (Factory setting)
NIST Buffers: 1,68 - 4,00 - 6,86** - 9,18
**Neutral point always requested as first
In measure mode at the bottom left of the display, a series of
beakers indicates the buffers with which the last automatic and
manual calibration was carried out.
P1.2 Resolution
Access this menu to choose the resolution needed, when reading the
pH parameter:
•0.1
•0.01 -default-
P1.3 Stability criteria in pH measurement
To consider the reading of a value truthful, we recommend waiting for the measurement stability, indicated
by the icon . When the measurement is not stable, four red flashing bands appear on the display.
Access this menu to change the measurement stability criterion:
“LOW”: choose this option to bring up the stability icon even in conditions of poor stability.
Readings included within 1.2 mV.
“MEDIUM” (default value): readings included within 0.6 mV.
“HIGH”: choose this option to display the stability icon only in conditions of high measurement stability,
readings included within 0.3 mV.
P1.6 pH Calibration data
Access this menu to get information about the last calibration performed. The following screens will
automatically scroll on the display:
•first screen: beakers indicating the buffers used;
•second screen: OFFSET value of the electrode expressed in mV;
•third and possibly fourth screen: Slope% in the measuring range (one Slope% only if two calibration
points are performed, two Slope% if three points are performed).
Note: The instrument accepts calibrations with pH electrodes with Slope% between 80 - 120% only.
Outside this range of acceptability, the instrument does not allow to end the calibration and displays the
error message SLOPE OUT OF RANGE
P1.8 Reset of pH parameter
If the instrument does not work perfectly or incorrect calibrations have been carried out, confirm YES with
the button to take all the parameters of the pH menu back to the default settings.
Beaker
Buffer value
Acid
< 6.5
Neutral
6.5 ~ 7.5
Basic
> 6.5

19
Rev. 1.0 30.01.2020
EN
IMPORTANT: The factory reset of the parameters DOES NOT erase the stored data.
P1.9 Temperature calibration
All the instruments of this series are pre-calibrated for a correct temperature reading. However, if there is a
difference between the measured and the real temperature (usually due to a probe malfunction), it is
possible to perform an offset adjustment of + 5°C.
Use the keys and to correct the temperature offset value and confirm with .
•Automatic pH calibration
Example: three-point calibration with USA type buffers (7.00 / 4.01 / 10.01).
•In pH measure mode press the key to enter calibration mode.
The string “1ST POINT PH 7.00” appears on the display; the device requires the neutral value as the
first calibration point.
Rinse the electrode with distilled water and gently dab with paper towel. Dip the electrode in the pH
7.00 buffer solution.
•When the signal is stable, the red bands are replaced by the stability icon
.
Press the key as indicated by the string “PRESS OK”.
The measured value flashes on the display and then the icon of the pH
7.00 beaker appears at the bottom left, indicating that the instrument
is calibrated on the neutral point.
•Remove the electrode, rinse with distilled water and dab gently with absorbent paper. Dip the sensor
in the pH 4.01 buffer solution (“CHANGE BUFFER”).
•The instrument is now ready to recognize the second calibration point.
Next to the string “2ND POINT PH”the different buffers, that the device can recognize automatically,
scroll.
•When the 4.01 value is recognized and the icon appears, press the key as indicated by
the string “PRESS OK”.
The actual measured value and the Slope% flash on the display; subsequently, the icon of the beaker
pH 4.01 appears next to the green beaker, indicating that the instrument is calibrated in the acid
field.
•Remove the electrode, rinse with distilled water and dab gently with paper towel. Dip the sensor in the
pH 10.01 buffer solution (“CHANGE BUFFER”).
•The instrument is now ready to recognize the third calibration point.
Next to the string “3RD POINT PH”, the different buffers, that the device can recognize automatically,
scroll.
•When the value 10.01 is recognized and the icon appears, press the key , as indicated by
the string “PRESS OK”.
Switching from an acidic to a basic pH may take a few more seconds to achieve stability.
The actual measured value and the second Slope% flash on the display; subsequently, the icon of the

20
Rev. 1.0 30.01.2020
EN
beaker pH 10.01 appears next to the green and red beakers, indicating that the instrument is
calibrated in the alkaline field.
•At the end of the third calibration point, the instrument returns automatically to measure mode.
•To perform a one- or two-point calibration, press the key once finished the first or second point.
Note: electrode calibration is an essential operation for the quality and truthfulness of a measurement.
Therefore, make sure that the buffers used are new, unpolluted and at the same temperature
ATTENTION: Before proceeding with the calibration operations, carefully consult the safety data sheets
of the substances involved:
•Calibration buffer solutions.
•STORAGE solution for pH electrodes.
•Filling solution for pH electrodes.
•Calibration with manual values
Example:two- point calibration pH 6.79 e pH 4.65 (DIN19267)
•Access the Setup menu for pH and select in P1.1Custom, press twice the key to return to the
measurement and position in pH mode .
•Press to enter the calibration mode.
•Rinse the electrode with distilled water and gently dab it with paper towel. Dip the electrode in the first
pH buffer solution (e.g. pH 6.79).
•Wait for the pH value on the display to stabilize; when the icon appears and the value flashes,
modify it using the directional keys by entering the correct one (e.g. pH 6.79), as suggested by the string
“ADJUST THE VALUE” and by the icon .
Note: Check the buffer value according to the temperature
•When the icon appears again, press the key to confirm the first point; the actual measured
value flashes on the display and the beaker icon appears with the buffer identification colour .
•Remove the electrode, rinse with distilled water, dab it gently with paper towel and dip it in the next
buffer (e.g. pH 4.65).
•Wait for the pH value on the display to stabilize; when the icon appears and the actual value
flashes, modify it using the directional keys by entering the correct one (e.g. pH 4.65), as suggested by
the string “ADJUST THE VALUE” and by the icon .
•When the icon appears again, press the key to confirm the second point; the actual
measured value flashes on the display, the Slope% and, next to the first beaker, the icon with the
identifying colour of the second buffer appears.
•At the end of the second calibration point, the instrument automatically returns to measure mode.
•To perform a one-point calibration just press the key after finishing the first point.