wtw TetraCon 700 User manual

ba55320e05 11/2009
TetraCon 700
Operating manual
Conductivity measuring cell

TetraCon 700
20 ba55320e05 11/2009
Note
The latest version of the present operating manual can be found on the
Internet under www.WTW.com.
Copyright ©Weilheim 2009, WTW GmbH
Reprinting - even as excerpts - is only allowed with the explicit written
authorization of WTW GmbH, Weilheim.
Printed in Germany.

TetraCon 700 Contents
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TetraCon 700 - Contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
1.1 Structure of the TetraCon 700 conductivity
measuring cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
1.2 Recommended fields of application . . . . . . . . . . . . . . . . 23
1.3 Variants and identification . . . . . . . . . . . . . . . . . . . . . . . 23
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.1 General information on safety . . . . . . . . . . . . . . . . . . . . 24
2.2 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.3 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 25
3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.2.1 Connection to the measuring transmitter . . . . . 27
4 Measuring / Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.1 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.2 Application-dependent settings . . . . . . . . . . . . . . . . . . . 29
5 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . . 30
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
6 What to do if ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7 Replacement parts and accessories . . . . . . . . . . . . . . 32
8 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.1 General features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.2 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.3 Measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . 35
8.4 Characteristic data on delivery . . . . . . . . . . . . . . . . . . . . 35

Overview TetraCon 700
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1 Overview
1.1 Structure of the TetraCon 700 conductivity measuring
cell
Fig. 1-1 Structure of the TetraCon 700 conductivity measuring cell
1Shaft
2 Closing head with protective ring
3 Voltage electrodes
4 Temperature sensor
5 Current electrodes (ring)
2
3
5
45
1
Sensor element

TetraCon 700 Overview
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1.2 Recommended fields of application
The TetraCon 700 conductivity measuring cell is suitable for stationary
measurements in water/wastewater applications.
Characteristics The principle of the measurement method enables to avoid influences
from primary or secondary polarization effects, which ensures a high
degree of measuring accuracy.
The modern epoxy casting technique reduces the danger of breaking
the conductivity measuring cell in rough industry use.
1.3 Variants and identification
Instrument
identification The instrument designation is printed on the plug-sided end of the cable. The series number is engraved in the closing head. Have these
designations ready in case of queries to the WTW service department.

Safety TetraCon 700
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2Safety
2.1 General information on safety
These safety instructions contain all instructions that have to be
followed for a safe operation of the TetraCon 700 conductivity
measuring cell. Before starting any work with the TetraCon 700,
carefully read the safety instructions and strictly follow all protective
measures mentioned.
Always store and make available these safety instructions together with
the operating manual in the vicinity of the place of installation.
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 danger level:
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.
2.2 Authorized use
Authorized use of the TetraCon 700 consists of stationary conductivity
measurement in the following areas:
zWater and wastewater
zEnvironment
zIndustry.

TetraCon 700 Safety
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Please observe the technical specifications according to chapter 8
TECHNICAL DATA. Only operation according to the instructions given in
this operating manual is considered to be authorized.
Any other use is considered to be unauthorized. Unauthorized use
invalidates any claims with regard to the guarantee.
2.3 General safety instructions
Function and
operational safety The conductivity measuring cell left the factory in a safe and secure technical condition.
The smooth functioning and operational safety of the conductivity
measuring cell 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 conductivity
measuring cell can only be guaranteed under the environmental
conditions that are specified in chapter 8 TECHNICAL DATA.
The specified temperature (chapter 8 TECHNICAL DATA) must be
maintained during the application and transport of the conductivity
measuring cell. Protect the conductivity measuring cell, particularly
against frost or overheating.

Safety TetraCon 700
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Safe operation If safe operation is no longer possible, the conductivity measuring cell
must be taken out of operation and secured against inadvertent
operation.
Safe operation is no longer possible if the conductivity measuring cell:
zhas been damaged in transport
zhas been stored under adverse conditions for a lengthy period of
time
zis visibly damaged
zno longer operates as described in this manual.
If you are in any doubt, contact the supplier of your conductivity
measuring cell.
Obligations of the
operator The operator of the conductivity measuring cell must ensure that the following rules and regulations are followed when dealing with
hazardous substances:
zEC directives for protective labor legislation
zNational protective labor legislation
zSafety regulations
zSafety data sheets of the chemical manufacturer.
Caution
All changes of the TetraCon 700 that exceed the work described
in this operating manual are not allowed. Repair work may only be
carried out by WTW Weilheim.

TetraCon 700 Commissioning
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3 Commissioning
3.1 Scope of delivery
zTetraCon 700
zThe conductivity measuring cell is equipped with protective caps
zOperating manual.
3.2 Installation
3.2.1 Connection to the measuring transmitter
The TetraCon 700 connection cable has a cable plug to be connected
to the Cond input socket of a measuring transmitter. It is connected to
the terminal strip of a measuring transmitter without a Cond input
socket via the ADA/AMPH-LF adapter (see chapter 7 REPLACEMENT
PARTS AND ACCESSORIES).
For detailed information please refer to the operating manual of the
measuring transmitter.

Measuring / Operation TetraCon 700
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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.).
Minimum immersion
depth Please observe the minimum immersion depth of the conductivity measuring cell (> 30 mm).
Spacing Please make sure that at the electrodes, the conductivity measuring
cell is surrounded by a clearance of at least 5 cm at the base and sides
(boundary fields).
Measuring at a narrow
location If the clearance is less than that, the cell constant changes. This leads to inexact measurement results. Normally, measuring transmitters
have a correction function that can compensate for this influence. This
procedure determines a new cell constant for the system consisting of
conductivity measuring cell + measuring environment. For more
detailed information, refer to section 4.2 APPLICATION-DEPENDENT
SETTINGS.
Note
Normally, the conductivity measuring cell does not age. Special
measuring media (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 media.
> 30 mm
TetraCon 700
> 50 mm
> 50 mm

TetraCon 700 Measuring / Operation
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4.2 Application-dependent settings
The TetraCon 700 conductivity measuring cell is long-term stable. The
conductivity measuring cell is immediately ready for operation for its
authorized use in water/wastewater applications.
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).
In chapter 6 WHAT TO DO IF ... 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 can be found in the accessory operating manual.
Note
Details on how to determine and set the cell constant can be taken from
the operating manual of the measuring transmitter.

Maintenance, cleaning, disposal TetraCon 700
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5 Maintenance, cleaning, disposal
5.1 Maintenance
The TetraCon 700 conductivity measuring cell does not require
maintenance.
5.2 Cleaning
Warning
Contact with the measuring solution or cleaning solution can
endanger the user! Take protective measures suitable for the kind
of measuring solution or cleaning solution (protective clothes,
eye protectors etc.).
If the conductivity measuring cell is heavily contaminated, this can
affect the measuring accuracy. Therefore, we recommend cleaning the
conductivity measuring cell regularly according to visual checks.
Especially before measuring low conductivity values, we recommend to
clean the measuring cell thoroughly.
Cleaning procedure
5.3 Disposal
We recommend to dispose of the conductivity measuring cell as
electronic waste.
Contamination Cleaning agents Reaction time at
room temperature
Water-soluble
substances
Tap water any
Slurry and loosely
adhering dirt or
biological films
Soft brush, warm
tapwater with
washing-up liquid
any
Fats and oils – Warm water and
household
washing-up liquid
– In case of heavy
contamination:
methylated spirit
–Any
– 5 minutes
maximum
Lime and hydroxide
deposits
Acetic acid (10 %) any

TetraCon 700 What to do if ...
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6 What to do if ...
Measurement delivers
no or wrong measured
values
Measurement provides
implausible measured
values
Cause Remedy
– Conductivity measuring cell not
correctly connected
– Check connection to measur-
ing transmitter
– Cable damaged – Check cable. If it is defective,
send conductivity measuring
cell to WTW
– Measuring range exceeded – Select larger measuring
range or set automatic selec-
tion of the measuring range
Cause Remedy
– Conductivity measuring cell is
heavily contaminated
– Clean the conductivity mea-
suring cell
– Boundary fields not observed – At the electrodes, the conduc-
tivity measuring cell must be
surrounded by a clearance of
at least 5 cm at the base and
sides. Otherwise, the cell con-
stant will change (see section
4.1 MEASURING)
– Electrodes damaged – Return the measuring cell
– System setting incorrect – Correct the system setting
– Measuring range exceeded – Observe the range of applica-
tion
– The measuring cell was
installed in a flow-through
device and the boundary field
is not sufficient
– Set the cell constant to the
value of the installed position
(if known)
– If the cell constant of the mea-
suring cell in the installed
position is not known, Adjust
the measured value to the
nominal value of a measuring
solution (see operating man-
ual of the measuring transmit-
ter)

Replacement parts and accessories TetraCon 700
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7 Replacement parts and accessories
Adapter
Note
Information on further accessories is given in the WTW catalog and on
the Internet.
Model Order no.
ADA/AMPH-LF 303 215

TetraCon 700 Technical data
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8 Technical data
8.1 General features
Measuring range 10 µS/cm ... 1000 mS/cm at 0 °C ... + 50 °C
Measuring principle Four-electrodes measurement
Temperature sensor Integrated NTC 30 (30 k:/ 25 °C)
Dimensions
Weight
Material
Connection cable
Guidelines and norms
used
Length 196 mm
(without screwed cable gland)
Shaft diameter 40 mm
approx. 660 g (without sensor connection cable)
Sensor head PVC, epoxy (filling material)
Electrodes, housing of the
temperature sensor
Graphite
Shaft Stainless steel 1.4571
Closing head POM
Protection ring POM
Cable screw joint Stainless steel 1.4571
Cable coating PUR
Length Depending on variant:
–1.5m
–7.0m
–15.0m
– Special lengths on customer
request up to 100 m
Diameter 8.8 mm
Smallest allowed
bend radius
Permanent bend: 180 mm
Short time bend: 90 mm
Connection Screw plug, 7 poles (IP 65)
General safety – EN 61010-1
– UL 3111-1
– CAN/CSA C22.2 No. 1010.1

Technical data TetraCon 700
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Test certificates UL, cUL
8.2 Electrical data
Caution
All voltages must be protective low voltages or safety extra low
voltages without hazard of contact according to E 61010-1 or
UL 3111-1.
Wiring diagram
Pin assignment
7-pole screw plug
Shield
Thermistor NTC
Thermistor NTC
Current electrode I1 (ring)
Voltage electrode U1
Voltage electrode U2
Current electrode I2 (ring)
6
1
2
3
5
7
4
NTC
30 kΩ
Measuring cell
Pin Assignment Wire color Max. voltage Max.
current
1
2
3
4
5
6
7
U2
U1
I1
Shield
NTC
I2
NTC
Yellow
Gray
Pink
Transparent
Brown
Green
White
---
---
1 V
---
3.5 V
1 V
3.5 V
---
---
5 mA
---
0.15 mA
5 mA
0.15 mA
43
5
6
7
1
2
Plug from the front:

TetraCon 700 Technical data
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8.3 Measurement conditions
Temperature range
Immersion depth min. 30 mm
Operating position any
Approach flow not required
Pressure resistance Conductivity measuring cell including connection cable:
7-pole screw plug:
The TetraCon 700 meets the requirements according to article 3(3) of
the directive, 97/23/EC ("pressure equipment directive").
8.4 Characteristic data on delivery
Temperature
measurement
Cell constant
Measuring medium 0 °C ... + 50 °C
Storage/transport - 5 °C ... + 65 °C
(storage in air recommended)
Max. admissible overpressure 106Pa (10 bar)
Type of protection IP 68 (106 Pa or 10 bar)
Type of protection IP 65
Sensor accuracy ± 0.2 K
Response time t90 (90 % of the final value display after) < 60 s
t95 (95 % of the final value display after) < 120 s
In free solution, i.e. base and side
clearance > 5 cm K = 0.917 cm-1 ± 1.5 %
In a flow-thru system,
e.g. EBST 700-DU/N K = 0.933 cm-1 ± 1.5 %

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