Carl Roth VioLab 50 Series User manual

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Index
Introduction 4
Safety information 5
Definitions of warning words and symbols 5
Reporting terms 5
 Additional documents for safety 6
Use according to destination 6
Basic requirements for a safe use 6
Unauthorized use 6
Device maintenance 6
Responsibility of the owner of the instrument 7
Instrumental features 7
Parameters 7
Datasheet 8
Instrument description 9
Display 9
Keyboard 9
LED 9
Installation 10
Supplied components 10
Start-up 10
Connection of the power supply 10
Turning On and Off 10
Instrument transportation 11
Key functions 11
Inputs / Outputs Connections 12
Symbols and icons on the display 12
Operation of the device 13
Setup Menu 14
Setup Menu Structure 14
Temperature measurement ATC – MTC 15
pH Parameter 15
pH parameter Setup 15
Automatic pH calibration 17
Calibration with manual values 18
Performing pH measurement 18
Sensors with DHS technology 19
Errors during calibration 19
mV Parameter 20

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ORP Parameter (Redox Potential) 20
ORP Parameter Setup 20
ORP automatic calibration 21
Conductivity Parameter 21
…how to get Conductivity? 21
Setup for Conductivity Parameter 21
Automatic COND calibration 24
Manual COND calibration 25
Errors during calibration 25
Performing Conductivity measurement 26
TDS Parameter 26
Instrument Setup Menu 27
Warranty 28
Warranty period and limitations 28
Disposal of electrical devices 28

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Introduction
XS Instruments, globally recognized as a leading brand in the field of electrochemical measurements, has
developed this new line of professional bench instruments, which is completely produced in Italy, finding
the perfect balance between performance, attractive design and ease of use.
The perfect balance between the high performance of the instrument, a modern and attractive design
and the user-friendliness make this series of instruments the ideal solution for electrochemical
measurements in 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 Conductivity, it is possible to work with 3 different cell constants and
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 using an XS Sensor electrochemical
electrode with an XS Instruments device and perform the calibrations with XS Solution certified
calibration solutions.

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Safety information
Definitions 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
NOTE for 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.
Warning
This symbol draws the attention to possible damage to the instrument
or instrumental parts.
Note
This symbol highlights further information and tips.
Attention
This symbol draws the attention to a possible danger from electric
current.

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 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 in laboratory.
Pay attention to the technical specifications shown in the INSTRUMENT CHARACTERISTICS / TECHNICAL
DATA table; any other use is to be considered unauthorized.
This instrument 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).
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.

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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 50 VioLab: pH, mV, ORP, Temp COND 50 VioLab: Cond, TDS, Temp
PC 50 VioLab: pH, mV, ORP, Cond, TDS, Temp

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Datasheet
Series 50 VioLab
pH
pH 50 VioLab - PC 50 VioLab
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
DHS sensor recognition
Yes
Stability criteria
Low – Med - High
mV
pH 50 VioLab - PC 50 VioLab
Range / Resolution
Range: -1000 … +1000 / Resolution: 1
ORP
pH 50 VioLab - PC 50 VioLab
Calibration points
1 point / 475 mV
Conductivity
COND 50 VioLab - PC 50 VioLab
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…4 / 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 50 VioLab - PC 50 VioLab
Measuring range /
TDS Factor
0,1 mg/l / 200,0 g/l
0.40…1.00
Temperature
pH 50 VioLab - COND 50 VioLab - PC 50 VioLab
Measuring range
0…100 °C
Resolution / Accuracy
0,1 / ± 0,5°C
Temperature compensation ATC
(NTC30KΩ) and MTC
pH: 0…100 °C
Cond: 0…100 °C
System
Display
High definition colour LCD
Brightness management
Manual
IP protection
IP 54
Power supply
5 V Power supply
Power supply tolerance
+ 10%
Sound level during standard operation
< 80 dB
Electric voltage
100 … 240 V
Work frequency
50 … 60 Hz
Maximum absorption
200 mA
Environmental operating conditions
0 … +45 °C
Maximum permissible humidity
< 95 % non-condensing
Maximum altitude of use
2000 m
System dimensions
160 x 140 x 45 mm
System weight
380 g

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Instrument description
Display
Keyboard
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 (colours)
Description
Power on
(green)
Fixed
Power off
(red)
Fixed
Standby
(green)
Flashing every 20 s
Stable measure
(green)
Flashing every 3 s
Errors during calibration
(red)
Flashing every 1 s
Errors during measurement
(red)
Flashing every 3 s
Selection confirmation
(green)
Switched on for 1 s
Timed screens
(green)
Fixed
DHS deactivation
(red)
Fixed
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
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
Battery charge level

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Installation
Supplied components
The instrument is always supplied with all the accessories necessary for being put into service; the
version without sensor is always supplied with:
instrument complete with multi-socket adapter, 1m S7/BNC connection cable, NT55 temperature
probe, buffer solutions in single-dose bottle and / or sachet, electrode holder stand, 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
Place the instrument on a flat, stable laboratory table with appropriate front and side accessibility. It is
recommended to place the instrument at not less than 20 cm from overlying and surrounding parts.
Positioning the device in this way, there is no more residual risk of possible minor damage caused by
manual handling of loads.
Make sure that the instrument and the surrounding environment are correctly illuminated.
Connection of the power supply
Check that the electrical standards of the line on which the instrumentation is to be installed comply
with the voltage and operating frequency of the instrument.
Use the original power supply only.
Connect the power supply plug to the connector on the rear panel of the instrument indicated with
the icon .
Connect the power supply to an electric socket easy to reach.
The instrument is equipped with a power supply unit which is not protected against any liquid entry;
therefore, for its use, it is necessary to keep all electrical cables and connections away from any liquids,
humidity and not to use the device in a humid room, such as a bathroom or a laundry room.
In the event of accidental loss of power during the operation of the instrument, there is no dangerous
condition for the user.
The instrument is NOT automatically reactivated. Press the button to turn the device back on.
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;
ATTENTION
Danger of death or serious injury from electric shock.
Contact with live components can lead to injury or death.
Use the adapter supplied only.
Do not put the power supply in contact with liquids nor in a condensing environment. Avoid thermal shock.
All electrical cables and connections must be kept away from moisture or liquids.
Check that the cables and plugs are not damaged, otherwise replace them.
During use, do not cover the power supply and/or do not place it inside containers.

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the instrument switches on at the last parameter used.
To switch off the instrument, press the key in measure mode.
Instrument transportation
To move the instrument to a new location, ship it carefully to avoid damage; the instrument can be
damaged, if it is not transported correctly.
Disconnect the instrument from the power supply and remove all the connection cables. Remove the
electrode arm from its holder.
To avoid damage to the instrument during long distance transport, use the original packaging.
If the original packaging is no longer available, choose a package that guarantees a safe shipment.
Key functions
Button
Pression
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 custom 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 50 VioLab: pH  mV  ORP
COND 50 VioLab: Cond  TDS
PC 50 VioLab: pH  mV  ORP  Cond  TDS
The correct use of the function keys and the attention in pressing them, given the small size, eliminates the
residual risk of minor damage, not probable, caused by simultaneous pressing of the keys; before using the
instrument, check that pressing the keys has the corresponding effect on the display.

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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 50 VioLab upper panel
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
The bars scroll if the measurement
is not stable
Measurement stability indicator
RCA for pH Temperature
probe
BNC for pH/ORP electrodes
BNC for conductivity cell
RCA for Conductivity
Temperature probe
Connection to the power grid
through a 5V power supply
4mm banana for
reference electrode

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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 50 VioLab
COND 50 VioLab
PC 50 VioLab
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.
String
Meaning
The instrument is in measure mode.
The instrument is in calibration mode (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.

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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 50 VioLab
COND 50 VioLab
PC 50 VioLab
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 .
The value or parameter 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
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 Cond pH

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P4.0
TDS SETTING
P4.1
TDS Factor
P9.0
SETTINGS
P9.1
Temperature U.M.
P9.4
Brightness
P9.6
Parameters Setup
P9.8
Reset
Temperature measurement ATC – MTC
ATC: The direct measurement of the sample temperature for all parameters is carried out through the
NTC 30KΩ probe, 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 50 Vio; PC 50 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 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:
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 FILTER
LOW – MEDIUM - HIGH
MED
P1.6
CALIBRATION DATA
-
-
P1.8
RESET SETTINGS
YES – NO
NO
P1.9
TEMPERATURE CAL
YES – NO
-
P1.1 Selection of pH buffers
Access this setup to select the buffer family for performing 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).

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The instrument automatically recognizes 2 families of buffers (USA and NIST); in addition, the user has the
option of performing a manual calibration 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 criterion 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 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
button to take all the parameters of the pH menu back to the default settings.
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 .
Beaker
pH value of the
buffer
Acid
< 6.5
Neutral
6.5 ~ 7.5
Basic
> 6.5

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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 paper towel. 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
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.

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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 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 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 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.
Note: If you are working with manual temperature compensation (MTC), update the value before calibrating
the instrument.
Performing pH measurement
In measure mode, press the key and move to the pH parameter indicated by the icon .
Connect the electrode to the pH / ORP BNC of the instrument (green).
If the user does not use an electrode with a built-in temperature probe or an external probe NTC 30KΩ,
it is recommended to manually update the temperature value (MTC).
Remove the electrode from its tube, rinse with distilled water and dab gently with paper towel.
Check the presence and eliminate any air bubbles in the membrane bulb by stirring vertically (as for
the clinical thermometer). If present, open the side cap.
Dip the electrode in the sample, while keeping it slightly stirred.
The scrolling on the display of four red bands means that the measurement is not stable yet.
Consider the measurement truthful only when the stability icon appears .

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UM Serie 50VioLab EN rev.1 19.05.2020
EN
Example of an unstable measurement Example of stable measurement
After the measurement, wash the electrode with distilled water and preserve it in the appropriate
storage solution.
Never store the sensors in ANY TYPE of water OR DRY!
It is a useful tool for obtaining accurate measurements always having on the display
the indication of the buffers used for calibration and the possibility of consulting the calibration data,
at any time, or entering the expiry date.
Sensors with DHS technology
The electrodes equipped with DHS technology can save a calibration curve within their memory. The
calibrated sensor is automatically recognized by any instrument enabled for DHS recognition and acquires
its calibration.
Connect the DHS electrode to the BNC and RCA connectors of the instrument.
The device automatically recognizes the chip; the following screens scroll on the display:
first screen: sensor identification name and production batch;
second screen: CALIBRATION DATE and TIME (if a GLP instrument is used) and beakers indicating
the buffers used;
third screen: OFFSET value of the electrode expressed in mV;
fourth and possibly fifth screen: Slope% in the measuring range (one Slope% only if two calibration
points are performed, two Slope% if three points are performed).
When the DHS electrode is recognized, the active calibration on the instrument becomes the one of
the sensor.
The icon on the display indicates that the connection was successful.
If the calibration is satisfactory (see the calibration data in menu P.1.6), the electrode is ready to start
the measurements. Otherwise, recalibrate the electrode; the data will be updated automatically.
The DHS electrode calibrated with a pH 7 Vio or PC 7 Vio device is ready to be used on any pH meter
enabled for DHS recognition and vice versa.
When the electrode is disconnected, a message on the display informs the user of the
deactivation of the sensor; the instrument regains its previous calibration and no data is lost!
The DHS electrode does not require batteries and if it is used on pH meters that are not
enabled to recognize the chip, it works as a normal “analog” electrode.
Errors during calibration
NOT STABLE: The button was pressed with still unstable signal. Wait for the icon to appear
to confirm the point.
WRONG BUFFER: The buffer is polluted or not part of the recognized families.
SLOPE OUT OF RANGE: The slope of the sensor calibration line is out of the acceptable range 80 - 120%.
CALIBRATION TOO LONG: the calibration exceeded the time limit: only the points calibrated up to that
moment will be kept.