Xylem VARIO User Manual
VARIO pH
Operating manual
ba75373e04 07/2006
Hand-held pH meter
VARIO pH
Accuracy when
going to press
The use of advanced technology and the high quality standard of our
instruments are the result of continuous development. This may result in
differences between this operating manual and your instrument. Also, we
cannot guarantee that there are absolutely no errors in this manual.
Therefore, we are sure you will understand that we cannot accept any legal
claims resulting from the data, figures or descriptions.
Copyright
© Weilheim 2006, WTW GmbH
Reprinting - even as excerpts - is only allowed with the explicit written
authorization of WTW GmbH, Weilheim.
Printed in Germany.
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VARIO pH
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Connecting the short pH electrode . . . . . . . . . . . . . . . . . . . . . 10
3.4 Connecting an electrode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.4.1 Electrode with integrated temperature sensor . . . . . . 12
3.4.2 Electrode without temperature sensor . . . . . . . . . . . . 14
3.4.3 Electrode with S7 connector . . . . . . . . . . . . . . . . . . . . 15
3.4.4 Connecting an external temperature probe . . . . . . . . 16
4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1 Operating elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2 Switching on the meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3.2 Measuring the pH value . . . . . . . . . . . . . . . . . . . . . . . 20
4.3.3 Measuring the temperature . . . . . . . . . . . . . . . . . . . . 20
4.4 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.4.1 Carrying out calibration . . . . . . . . . . . . . . . . . . . . . . . 24
4.4.2 Displaying the calibration data . . . . . . . . . . . . . . . . . . 27
4.4.3 Setting the calibration interval . . . . . . . . . . . . . . . . . . 28
4.5 Saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.5.1 Saving measured data . . . . . . . . . . . . . . . . . . . . . . . . 29
4.5.2 Displaying measured data from the memory . . . . . . . 30
4.5.3 Erasing measured data from the memory . . . . . . . . . 31
4.6 Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.6.1 Displaying and adjusting the date and time . . . . . . . . 31
4.6.2 Alarm function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.6.3 Stopwatch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.6.4 Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.7 Switch-off interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.8 Turning the display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.9 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . . 39
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
5.2 Battery exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
5.3 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.4 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.5 Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.6 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
3
VARIO pH
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.2 Measuring ranges, resolution, accuracy . . . . . . . . . . . . . . . . . 48
7.2.1 Short pH electrode SenTix V . . . . . . . . . . . . . . . . . . . . 48
7.2.2 Adapter with electrode (DIN and S7 connection) . . . . 48
8 Lists. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
9 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4
VARIO pH Overview
1 Overview
The hand-held VARIO pH meter enables you to measure the pH value of a
solution very simply. All functions and settings are operated via the touch
screen.
1
2
3
47
5
6
1 Display (touch screen)
2 Connector (red) for a temperature sensor when using an electrode
with an integrated temperature sensor on the adapter
3 Connector (blue) for a temperature sensor when using an electrode
with an external temperature sensor on the adapter
4 Short pH electrode
5 Junction
6 Membrane
7 Adapter for electrodes with DIN or S7 connector
Sensor types Short pH electrodes and electrodes with DIN or S7 connector can be
connected to the meter.
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Short pH electrodes are directly connected to the sensor connector of the
VARIO pH. The temperature sensor and reference electrode are integrated
in the short pH electrode.
Electrodes with DIN or S7 connector are connected to the VARIO pH via an
adapter. The use of an external temperature probe (NTC 30) is possible.
5
Overview VARIO pH
Note
Certain sensors enhance the scope of functions of the VARIO pH.
More detailed information on the presently available sensors and their
individual features can be found in chapter 7 T
ECHNICAL DATA.
Note
You will find additional information on electrodes and other accessories in the
WTW catalog or on the Internet (http://www.wtw.com).
6
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VARIO pH Safety
2Safety
This operating manual contains basic instructions that you must follow during
the commissioning, operation and maintenance of the meter. Consequently,
all responsible personnel must read this operating manual before working
with the meter. The operating manual must always be available within the
vicinity of the meter.
User qualification The meter was developed for work in the laboratory.
Thus, we assume that, as a result of their professional training and
experience, the operators will know the necessary safety precautions to take
when handling chemicals.
Safety
instructions
Further notes
The individual chapters of this operating manual use safety instructions such
as the label shown below to indicate various hazards or dangers:
Caution
indicates instructions that must be followed precisely in order to avoid
the possibility of slight injuries or damage to the instrument or the
environment.
Note
indicates notes that draw your attention to special features.
Note
indicates cross-references to other documents, e.g. operating manuals.
2.1 Authorized use
The authorized use of the meter consists exclusively of the pH and ORP
measurement.
The technical specifications as given in chapter 7 T
observed. Only the operation and running of the meter according to the
instructions given in this operating manual is authorized.
Any other use is considered to be unauthorized.
ECHNICAL DATA must be
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7
Safety VARIO pH
2.2 General safety instructions
This instrument is built and inspected according to the relevant guidelines
and norms for electronic measuring instruments (see chapter 7 T
DATA).
It left the factory in a safe and secure technical condition.
ECHNICAL
Function and
operational safety
The smooth functioning and operational safety of the meter can only be
guaranteed if the generally applicable safety measures and the specific
safety instructions in this operating manual are followed during operation.
The smooth functioning and operational safety of the meter can only be
guaranteed under the environmental conditions that are specified in chapter
7 T
ECHNICAL DATA.
If the instrument was transported from a cold environment to a warm
environment, the formation of condensate can lead to the faulty functioning
of the instrument. In this event, wait until the temperature of the instrument
reaches room temperature before putting the instrument back into operation.
Safe operation If safe operation is no longer possible, the instrument must be taken out of
service and secured against inadvertent operation!
Safe operation is no longer possible if the meter:
z has been damaged in transport
z has been stored under adverse conditions for a lengthy period of time
z is visibly damaged
z no longer operates as described in this manual.
Obligations of the
purchaser
8
If you are in any doubt, please contact the supplier of the instrument.
The purchaser of this meter must ensure that the following laws and
guidelines are observed when using dangerous substances:
z EEC directives for protective labor legislation
z National protective labor legislation
z Safety regulations
z Safety datasheets of the chemical manufacturers.
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VARIO pH Commissioning
3 Commissioning
3.1 Scope of delivery
VARIO pH single
meter
VARIO pH sets Depending on the set, the following accessories are additionally contained in
z VARIO pH hand-held meter
z WTW Technical buffers
– pH 4.01
– pH 7.00
z Microfiber cleaning cloth
z Accompanying documents:
– Manual for commissioning
– Short instructions to be glued into the lid of the case
– CD-ROM with a description of all instrument functions
z Transport case with insert
the scope of delivery:
Accessories Set 1 Set 2 Set 3 Set 4 Set 5
Short pH electrode SenTix V and
watering cap
DIN adapter ADA/VARIO-DIN x x x x
x
S7 adapter ADA/VARIO-S7 x x
SenTix 21 electrode x
SenTix 41 electrode x
SenTix 20 electrode x
SenTix 60 electrode x
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9
Commissioning VARIO pH
3.2 Initial commissioning
Perform the following activities:
z Connect the electrode to the meter (see section 3.3 and section 3.4)
z If necessary, connect the temperature sensor (see section 3.4)
z Switch on the meter (see section 4.2)
z Set the date and time (see section 4.6.1)
z Calibrate the meter together with the electrode (see section 4.4)
3.3 Connecting the short pH electrode
Connect a short pH electrode to the meter as follows:
1 New short pH electrode: Remove the transport cap (1) filled with
liquid (potassium chloride solution) from the short pH electrode and
dispose of it.
Caution
Never reuse the transport cap.The membrane of the short pH electrode
could be damaged when putting on the transport cap again.
2
3
1
2 Pull off the protective cap (2) from the short pH electrode.
3 Unscrew the coupling ring (3) from the meter.
10
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VARIO pH Commissioning
RESET
4 Place the short pH electrode in a straight position to the meter (turn
the wide cut-out to the front) and plug it in carefully with slight force.
5 Screw the short pH electrode tight using the coupling ring.
The meter is ready for operation.
RESET
LAP
mV
8
1
LoBat
Day.Month
pH
Lap
h:min
min:s
Ident
CLR
SenTix V
If you do not wish to measure immediately, put the watering cap on the short
pH electrode (see section 5.4).
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11
Commissioning VARIO pH
3.4 Connecting an electrode
The adapters make the meter compatible with commercial electrodes. You
can turn the display by 180 degrees if necessary (see section 4.8).
You can connect electrodes with an integrated temperature sensor (see
section 3.4.1) and electrodes without a temperature sensor (see section
3.4.2).
With an electrode without integrated temperature sensor, you can
additionally connect an external NTC 30 temperature probe.
3.4.1 Electrode with integrated temperature sensor
Connect an electrode with integrated temperature sensor to the VARIO pH
as follows:
1 Unscrew the coupling ring (1) from the meter.
2 Place the adapter (2) in a straight position to the meter (turn the wide
cut-out to the front) and plug it in carefully with slight force.
2
1
3 Using the coupling ring, tighten the adapter.
4 Connect the DIN plug of the electrode to the adapter.
5 Connect the banana plug of the electrode (temperature sensor) to the
red
lateral socket on the VARIO pH.
12
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VARIO pH Commissioning
VARIO pH with
connected
electrode
DIN adapter
Plug of the NTC 30
temperature sensor
RESET
CAL
LAP
MEM
d
mV
pH
8
7 9 4
C
1
2 4 8
Lap
h:min
LoBat
Day.Month
min:s
Ident
ESC
CLR
Electrode
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13
Commissioning VARIO pH
3.4.2 Electrode without temperature sensor
Connect an electrode without an integrated temperature sensor to the
VARIO pH as follows:
1 Connect the adapter to the meter (see section 3.4.1).
2 Connect the plug of the electrode to the adapter.
3 If necessary, connect the two banana plugs of the external
temperature probe to the lateral sockets on the VARIO pH. The
polarity is arbitrary.
VARIO pH with
connected
electrode
DIN adapter
RESET
CAL
LAP
MEM
d
mV
pH
8
7 9 4
C
1
2 5
2
Lap
h:min
LoBat
Day.Month
min:s
Ident
ESC
CLR
Electrode
Note
When using an electrode without temperature sensor it is possible to connect
an external temperature probe (see section 3.4.4).
14
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VARIO pH Commissioning
e
3.4.3 Electrode with S7 connector
Electrodes with a plug head connector can be connected directly to the S7
adapter or, via a cable, to the DIN adapter of the VARIO pH.
Direct connection Connect the electrode directly as follows:
1 Connect the plug head adapter to the meter (see section 3.4.1).
2 Plug the electrode directly on the plug-in adapter.
RESET
CAL
LAP
MEM
d
mV
pH
8
7 9 4
C
2
1
2 5
Lap
h:min
LoBat
Day.Month
min:s
Ident
ESC
CLR
Connection with
cable
S7 Adaptor
plug head of electrod
Depending on the electrode used, it is connected to the VARIO pH via a
cable as described in section 3.4.1 or section 3.4.2.
Note
When using an electrode without temperature sensor it is possible to connect
an external temperature probe (see section 3.4.4).
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15
Commissioning VARIO pH
3.4.4 Connecting an external temperature probe
When using an electrode without temperature sensor it is possible to connect
an external temperature probe.
Connect an external temperature probe as follows:
3 Connect the two banana plugs of the external temperature probe to
the lateral sockets on the VARIO pH. The polarity is arbitrary.
VARIO pH with
connected
electrode and
temperature probe
DIN adapter
RESET
CAL
LAP
MEM
d
mV
pH
8
7 9 4
C
1
2 4 8
Lap
h:min
LoBat
Day.Month
min:s
Ident
ESC
CLR
Electrode
NTC 30
temperature sensor
16
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VARIO pH Operation
d
MEMMEM
7 9
9 4
2 4
C
4 6
ESC
CAL
d
MEMMEM
7 9
d
MEMMEM
2 4
7
C
9 4
2
ESC
C
6
4 Operation
4.1 Operating elements
The entire operation is carried out via the touch sensitive surface of the
display (touch screen). A slight pressure on the surface suffices to start a
function. Any pressure on the surface is confirmed by an acoustic signal.
Display elements
CAL
LAP
d
1
8
2
1
LoBat
Day.Month
ESC
1 Upper display line - example: stored pH measured value
2 Lower display line - example: storing time
3 Function keys
4 Status display indicators on the current function of the meter:
Example: r = Read out memory
5 Additional information
Example: h = Unit of the display in the second line
6 Sensor symbol
RESET
MEM
7 9 4
5 5 8
h:min
4
min:s
CLR
Lap
mV
pH
C
Ident
6
3
5
Touch screen The touch screen contains 8 touch sensitive tactile areas that start different
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functions when being pressed, depending on the operating situation.
The function of the keys is connected to the display in this area.
CAL
d
M
EM
7 9 4
2 4 6
ESC
C
17
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