wtw TetraCon 700 IQ User manual

TetraCon® 700 IQ (SW)
ba55322e06 03/2006
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.
Note
The latest version of the present operating manual can be found on the
Internet under www.WTW.com.
Copyright ©Weilheim 2006, WTW GmbH
Reprinting - even as excerpts - is only allowed with the explicit written
authorization of WTW GmbH, Weilheim.
Printed in Germany.

TetraCon® 700 IQ (SW) Contents
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1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
1.1 How to use this component operating manual . . . . . . . . 2-1
1.2 Structure of the TetraCon® 700 IQ (SW) . . . . . . . . . . . . 2-2
1.3 Recommended fields of application . . . . . . . . . . . . . . . . 2-2
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 3-2
3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
3.2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
3.3 Commissioning / Getting the instrument ready for measuring
4-2
3.4 TetraCon® 700 IQ (SW) setting table . . . . . . . . . . . . . . . 4-3
4 Measuring / Operation . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
4.1 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
4.2 Application-dependent settings . . . . . . . . . . . . . . . . . . . 5-2
4.2.1 General information . . . . . . . . . . . . . . . . . . . . . . 5-2
4.2.2 Determining the cell constant in a user-specific
measuring environment . . . . . . . . . . . . . . . . . . . 5-3
5 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . 6-1
5.1 General maintenance instructions . . . . . . . . . . . . . . . . . 6-1
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
7.1 Measurement characteristics . . . . . . . . . . . . . . . . . . . . . 8-1
7.2 Application characteristics . . . . . . . . . . . . . . . . . . . . . . . 8-2
7.3 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
7.4 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
7.5 Characteristic data on delivery . . . . . . . . . . . . . . . . . . . . 8-4
8 Indexes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
8.1 Explanation of the messages . . . . . . . . . . . . . . . . . . . . . 9-1
8.1.1 Error messages . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
8.2 Status info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

Contents TetraCon® 700 IQ (SW)
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TetraCon® 700 IQ (SW) Overview
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1 Overview
1.1 How to use this component operating manual
Structure of the
IQ SENSOR NET
operating manual
Fig. 1-1 Structure of the IQ SENSOR NET operating manual
The IQ SENSOR NET operating manual has a modular structure like the
IQ SENSOR NET system itself. It consists of a system operating manual
and the operating manuals of all the components used.
Please file this component operating manual in the ring binder of the
system operating manual.

Overview TetraCon® 700 IQ (SW)
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1.2 Structure of the TetraCon® 700 IQ (SW)
Fig. 1-2 Structure of the conductivity sensor (example: TetraCon®700 IQ)
Characteristics The principle of the measurement method makes it possible to avoid
influences from primary or secondary polarization effects, which
ensures a high degree of measuring accuracy.
A modern epoxy sealing technique reduces the chances of breakage of
the sensor in the rough industrial environment.
1.3 Recommended fields of application
TetraCon 700 IQ Stationary measurements in water/wastewater applications.
TetraCon 700 IQ SW Stationary measurements in seawater and brackish water,
aquaculture.
1Shaft
2Plug head connector
3Voltage electrodes
4Temperature sensor
5Current electrodes (ring)
2
3
5 4
5
1

TetraCon®700 IQ (SW) Safety
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2 Safety
This component operating manual contains special instructions that
must be followed during the operation of the TetraCon® 700 IQ (SW)
conductivity sensor. Thus, it is essential to read this component
operating manual before carrying out any work using this sensor. In
addition to this manual, the SAFETY chapter of the IQ SENSOR NET
system operating manual must be followed.
Always keep this component operating manual together with the
system operating manual and any other component operating manuals
in the vicinity of the IQ SENSOR NET system.
Special user
qualifications
The sensor was developed for applications in online measuring
technology - essentially in the field of wastewater treatment. Thus, we
assume that the operators are familiar with the necessary precautions
to take when dealing with chemicals as a result of their professional
training and experience.
General safety
instructions
Safety instructions in this operating manual can be recognized by the
warning symbol (triangle) in the left column. The signal word (e. g.
"Caution") indicates the level of the danger:
Warning
indicates instructions that must be followed precisely in order to
prevent serious dangers to persons.
Caution
indicates instructions that must be followed precisely in order to
avoid slight injuries or damage to the instrument or the
environment.
Other labels
Note
indicates notes that draw your attention to special features.
Note
indicates cross-references to other documents, e.g. operating
manuals.

Safety TetraCon®700 IQ (SW)
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2.1 Authorized use
The authorized use of the TetraCon® 700 IQ (SW) comprises its use
as a conductivity sensor in the IQ SENSOR NET.
The technical specifications according to chapter 7 TECHNICAL DATA
must be observed. Only operation according to the instructions in this
operating manual is authorized.
Any other use is considered to be unauthorized. Unauthorized use
invalidates any claims with regard to the guarantee.
Caution
Only connect and operate the sensor together with IQ SENSOR NET
accessories.
2.2 General safety instructions
The sensor left the factory in a safe and secure technical condition.
Function and
operational safety
The failure-free function and operational safety of the sensor is only
guaranteed if the generally applicable safety measures and the special
safety instructions in this operating manual are followed during its use.
The failure-free function and operational safety of the sensor is only
guaranteed under the environmental conditions that are specified in
chapter 7 TECHNICAL DATA.
The specified temperature range (chapter 7 TECHNICAL DATA) must be
maintained during the application and transport of the sensor. Protect
the sensor, particularly against frost or overheating.
Caution
The sensor may only be opened by specialists authorized by
WTW.

TetraCon®700 IQ (SW) Safety
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Safe operation If safe operation is no longer possible, the sensor must be taken out of
operation and secured against inadvertent operation.
Safe operation is no longer possible if the sensor:
!has been damaged in transport
!has been stored under adverse conditions for a lengthy period of
time
!is visibly damaged
!no longer operates as described in this manual.
If you are in any doubt, contact the supplier of your sensor.
Obligations of the
operator
The operator of the sensor must ensure that the following rules and
regulations are followed when dealing with hazardous substances:
!EEC directives for protective labor legislation
!National protective labor legislation
!Safety regulations
!Safety data sheets of the chemical manufacturer.

Safety TetraCon®700 IQ (SW)
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TetraCon®700 IQ (SW) Commissioning
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3 Commissioning
3.1 Scope of delivery
!TetraCon® 700 IQ (SW)
!The sensor is fitted with protective caps
!Operating manual.
3.2 Installation
Connection cable A sensor connection cable of the SACIQ or SACIQ SW type is required
to connect the sensor. The cable is available in different lengths.
Compared to the standard model SACIQ, the SACIQ SW sensor
connection cable is optimized regarding its corrosion resistance in
seawater and brackish water and adapted for use in conjunction with
the TetraCon®700 IQ SW. Information on this and other
IQ SENSOR NET accessories is given in the WTW catalog and on the
Internet.
Note
How to connect the SACIQ (SW) sensor connection cable to the
terminal strip of an MIQ module is described in chapter 3 INSTALLATION
of the IQ SENSOR NET system operating manual.
Are the plug
connections dry?
Before connecting the sensor and sensor connection cable, please
make sure that the plug connections are dry. If moisture gets into the
plug connections, first dry the plug connections (dab them dry or blow
them dry using compressed air).
Note
Do not suspend the sensor on the sensor connection cable. Use a
sensor holder or armature.
Information on this and other IQ SENSOR NET accessories is given in
the WTW catalog and on the Internet.

Commissioning TetraCon®700 IQ (SW)
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Connecting the sensor
to the sensor
connection cable
Fig. 3-1 Connecting the sensor
3.3 Commissioning / Getting the instrument ready for
measuring
1 Take the protective caps off the plug connections of the sensor
and the SACIQ (SW) sensor connection cable and keep them
safe.
2 Plug the jack of the SACIQ (SW) sensor connection cable onto
the plug head connector of the sensor. At the same time, rotate
the socket so that the pin in the plug head connector (1) clicks
into one of the two holes in the jack.
3 Then, screw the coupling ring (2) of the sensor connection
cable onto the sensor up to the stop.
1 Pull the protective cap off the sensor.
2 If required, assign a user-defined name to the sensor (see
relevant IQ SENSOR NET system operating manual).
3 Set the sensor (see section 3.4).
SACIQ
1
2

TetraCon®700 IQ (SW) Commissioning
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3.4 TetraCon®700 IQ (SW) setting table
Menu item Selection/values Explanations
Measuring mode !Conductivity /cm
!Salinity
!TDS
!Conductivity /m
Measured parameter in the measured
value display
(TDS = total dissolved solids)
Measuring ranges
with
Measuring mode,
Conductivity /cm
!AutoRange
! 0 .. 20.00 mS/cm
! 0 .. 200.0 mS/cm
! 0 .. 2000 mS/cm
! 0 .. 20.00 mS/cm
! 0 .. 200.0 mS/cm
! 0 .. 500.0 mS/cm
These measuring ranges are available for
selection. If the AutoRange menu item is
selected, the measurement range selection
and switchover is made automatically.
Measuring ranges
with
Measuring mode,
Conductivity /m
!AutoRange
! 0 .. 2.000 mS/m
! 0 .. 20.00 mS/m
! 0 .. 200.0 mS/m
! 0 .. 2000 mS/m
! 0 .. 20.00 S/m
!0 .. 50.00 S/m
Measuring range in
Measuring mode
Salinity
0 .. 70 The measuring range is permanently set.
Measuring range in
Measuring mode
TDS
0 .. 2000 mg/l The measuring range is permanently set.
Temperature mode !°C
!°F
Unit of the measured temperature value
(Celsius, Fahrenheit).
Temp. compensation !none
!nonlinear
!linear with setting
!For natural waters (groundwater,
surface water, drinking water),
salinity (seawater) according to IOT
!Other aqueous measuring solutions

Commissioning TetraCon®700 IQ (SW)
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Carrying out settings Using s, switch from the measured value display to the main menu of
the settings. Then navigate to the setting menu (setting table) of the
sensor. The exact procedure is given in the relevant IQ SENSOR NET
system operating manual.
Temp. compensation
linear
0.5 ... 3.0 %/K Factor for linear temperature
compensation. This menu item only
appears if linear temperature
compensation is selected.
Reference
temperature
!Tref20 (20 °C)
!Tref25 (25 °C)
The reference temperature is the basis for
calculating the temperature compensation.
TDS factor 0,40 .. 1,00 Factor for automatic calculation of the total
dissolved solids by the sensor.
Cell constant 0.826 ... 1.008 cm-1 Here you can set the cell constant if this is
necessary for a special application, e.g.
when using a flow-thru vessel.
Temperature
adjustment
-1.5 ... +1.5 K Here you can balance the temperature
sensor in the sensor against a reference
temperature measurement.
Save and quit The system confirms the saving of the
settings and the display switches to the
next higher level.
Quit The display switches to the next higher
level without saving the new settings.

TetraCon®700 IQ (SW) Measuring / Operation
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4 Measuring / Operation
4.1 Measuring
Warning
Contact with the sample can lead to danger to the user!
Depending on the type of sample, suitable protective measures
must be taken (protective clothing, protective goggles, etc.).
Note
Please make sure that the sensor is surrounded by a gap of at least 5
cm at the base and sides (boundary fields) when measuring at the
electrodes. If the gap is less than that, the cell constant changes. This
leads to incorrect measurement results. If the gap cannot be
maintained, e.g. in narrow pipes, the cell constant can be adjusted to
suit the installation conditions (see section 4.2.2).
Fig. 4-1 Distance of the sensor from the edge
1 Immerse the sensor in the measuring medium.
2 The measured value is immediately available.

Measuring / Operation TetraCon®700 IQ (SW)
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4.2 Application-dependent settings
4.2.1 General information
The TetraCon®700 IQ (SW) conductivity sensor is stable over the long
term. When being used for the authorized use of the sensor in water/
wastewater applications, it is immediately ready for use.
Note
Normally, the conductivity measuring cell does not age. Special
measuring mediums (e.g. strong acids and bases, organic solvents) or
temperatures that are too high may considerably reduce its lifetime or
lead to damage. No warranty claims can be made for mechanical
damage or any failure caused by these types of measuring mediums.
Adapting the cell
constant to the
installation location
In the case of special installation conditions, it may be necessary to
adapt the cell constant (due to the influence of the measuring
environment, e.g. of boundary fields).
Note
The cell constant is stored in the controller. It is automatically allocated
to the substitute sensor when the sensor is exchanged.
Cell constants with
WTW installation
accessories
In chapter 7 TECHNICAL DATA of this operating manual you will find the
correct values to set for some products of the WTW accessory program
that require a correction of the cell constant (if it is possible to give fixed
values at all). If necessary, special installation recommendations for the
TetraCon®700 IQ (SW) can be found in the accessory operating
manual. In case of doubt it is necessary to determine the cell constant
according to section 4.2.2.
Note
The setting of the cell constant is made in the setting menu of the
sensor according to section 3.4.

TetraCon®700 IQ (SW) Measuring / Operation
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4.2.2 Determining the cell constant in a user-specific measuring
environment
1 Immerse the operable conductivity sensor in the test sample in
the measuring environment and wait until the measured value
is stable.
2 Read the conductivity on the display and note it down (-> χD).
3 Take a representative sample simultaneously with the
conductivity measurement and from the immediate vicinity of
the sensor if possible.
4 Determine the conductivity of the sample without the
influence of boundary fields (-> χX). The measurement can,
for example, be performed as follows:
!Measuring in the laboratory using a laboratory conductivity
measuring cell
!Measuring using the TetraCon®700 IQ (SW) while
observing the bottom and lateral gaps according to section
4.1 MEASURING.
Attention: Set the same procedure for the temperature
compensation as for measuring the χD!
5 Read and note down the currently set cell constant in the
setting menu of the sensor (see section 3.4) (-> KA).
6 Calculate the new cell constant KNaccording to:
7 Set and store the new cell constant KN(see section 3.4).
KN=(χX/χD)·KA

Measuring / Operation TetraCon®700 IQ (SW)
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TetraCon®700 IQ (SW) Maintenance, cleaning, disposal
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5 Maintenance, cleaning, disposal
5.1 General maintenance instructions
Warning
Contact with the sample can lead to danger to the user!
Depending on the type of sample, suitable protective measures
must be taken (protective clothing, protective goggles, etc.).
Maintenance condition We recommend to switch on the maintenance condition each time
before removing the sensor from its measuring position. This avoids
unintended reactions of linked outputs. For more detailed information
on the maintenance condition please refer to the respective
IQ SENSOR NET system operating manual.
Maintenance-free
operation
The TetraCon®700 IQ (SW) conductivity sensor operates without the
need for any maintenance.
5.2 Cleaning
If the sensor is heavily contaminated, this can affect the measuring
accuracy. Therefore, we recommend to clean the sensor regularly
according to visual checks. Thorough cleaning of the sensor is
particularly recommended before measuring lower values of
conductivity, as well as before adjusting the measured value.
Note
We do not recommend to unscrew the sensor from the sensor
connection cable in order to clean it. Otherwise, moisture and/or dirt
can get into the plug connection where they can cause contact
problems.
If you would like to disconnect the sensor from the sensor connection
cable, please note the following points:
!Before disconnecting the sensor from the SACIQ (SW) sensor
connection cable, remove any larger pieces of contamination from
the sensor, particularly in the area of the plug connection (brush it
off in a bucket of tapwater, wash it off with a hose or wipe it off with
a cloth).
!Unscrew the sensor from the SACIQ (SW) sensor connection cable.
!Always place a protective cap on the plug head of the sensor and on
the SACIQ (SW) sensor connection cable so that no moisture or dirt
can get into the contacting surfaces.
!In corrosive environments close the dry socket of the sensor
connection cable with the SACIQ-Plug protective screw cap in order

Maintenance, cleaning, disposal TetraCon®700 IQ (SW)
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to protect the electrical contacts from corrosion. The protective cap
is available as an accessory under the order number 480 065. It is
included in the standard scope of delivery of the SACIQ SW sensor
connection cable.
Cleaning
5.3 Disposal
We recommend to dispose of the sensor as electronic refuse.
Contamination Cleaning agents Reaction time at
room temperature
Water-soluble
substances
Tap water Any
Fats and oils –Warm water and
household
detergent;
–In the case of
heavy
contamination:
Methylated spirits
–Any
–Maximum of 5
minutes
Lime and hydroxide
deposits
Acetic acid (10 %) max. 5 minutes