wtw TetraCon 325 User manual

TetraCon 325
TetraCon 325/C
ba55301e04 01/2009 9
Operating manual
Standard conductivity measuring cell

Copyright © 2016 Xylem Analytics Germany GmbH
Printed in Germany.

TetraCon 325 / TetraCon 325/C Contents
11
Contents
ba55301e04 01/2009
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.1 Structure and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.2 Recommended fields of application . . . . . . . . . . . . . . . . . . . . . 12
2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Overview TetraCon 325 / TetraCon 325/C
12 ba55301e04 01/2009
1Overview
1.1 Structure and function
Structure
1.2 Recommended fields of application
zOn site measurements in rivers, lakes and wastewater
zFish farming
zGround water measurements
zApplications in water laboratories
The TetraCon 325/C is especially suitable for higher chemical loads,
particularly acidic media.
1Voltage electrode (inside, 2x)
2Current electrode (ring, 2x)
3Temperature sensor in graphite enclosure
4Shaft
5Closing head
41, 2 3 5

TetraCon 325 / TetraCon 325/C Cleaning
13
ba55301e04 01/2009
2 Cleaning
CAUTION
To clean the sensor, disconnect it from the instrument.
Outside cleaning We recommend to clean the sensor thoroughly, especially before measuring
low conductivity values.
After cleaning, thoroughly rinse with deionized water and recalibrate if
necessary.
Aging of the
conductivity
measuring cell
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. The
warranty does not cover cases where such conditions cause failure or
mechanical damage.
Disposal We recommend to dispose of the measuring cell as electronic waste.
3 What to do if...
Contamination Cleaning procedure
Lime sediments Immerse in acetic acid for 5 minutes (volume
share = 10 %)
Fat/oil Clean with warm water containing washing-
up liquid
Error symptom Cause Remedy
No temperature or
conductivity display
– No connection between
measuring instrument and
conductivity measuring cell
– Cable defective
– Connection between measuring
instrument and conductivity
measuring cell
Measurement delivers
implausible conductivity
values
– Incorrect cell constant adjusted at
the measuring instrument
– Measuring range exceeded
– Contamination in the area of the
electrodes
– Electrodes damaged
– Check / correct the cell constant
– Make sure the correct sensor is
being used for the application
– Clean the conductivity measuring
cell (see chapter 2).
– Return the sensor
Incorrect temperature
display
– The temperature sensor was not
immersed deep enough in the
measuring solution
– Temperature sensor defective
– Observe the minimum immersion
depth
– Return the conductivity measuring
cell

Technical data TetraCon 325 / TetraCon 325/C
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4 Technical data
General features Measuring principle Four-electrodes measurement
Cell constant 0.475 cm-1 ±1.5 %
Temperature sensor integrated NTC 30 (30 k:at 25 °C / 77 °F)
Dimensions
(in mm)
Weight approx. 135 g
Materials Shaft Epoxy
Connection head TetraCon 325: POM
TetraCon 325/C: PEEK
Conductivity electrodes Graphite
Thermistor enclosure Graphite
Connection cable Lengths TetraCon 325: 1.5 / 3 / 6 / 10 / 15 / 20 m
TetraCon 325/C: 1.5 m
Diameter 6 mm
Smallest allowed
bend radius
fixed installation: 50 mm
flexible use: 80 mm
Plug type Socket, 8 pins
Pressure
resistance Sensor with connection cable
IP 68 (2 x 105Pa or 2 bar)
Cable plug IP 67 (when plugged in)
The TetraCon 325 / TetraCon 325/C meets the requirements according to
article 3(3) of the directive, 97/23/EC ("pressure equipment directive").
162.5
15.3 21.7 17.5
120.0

TetraCon 325 / TetraCon 325/C Technical data
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ba55301e04 01/2009
Pin assignment
Measurement
conditions Conductivity measuring range
1 PS/cm ... 2 S/cm
Temperature range -5 ... 80 °C (100 °C)
23 ... 176 °F (212 °F)
Max. allowed overpressure 2 x 105Pa (2 bar)
Minimum depth of
immersion
36 mm
Maximum depth of
immersion
(at temperature)
Whole sensor + cable up to 80 °C (176 °F)
Sensor shaft only (=120 mm) up to 100 °C
(212 °F)
Operating position Any
Storage
conditions Recommended storing method
In air
Storage temperature 0 ... 50 °C (32 ... 122 °F)
Characteristic data
on delivery Temperature responding behavior
t99 (99 % of the final value display after)
<20s
Precision of the temperature
sensor
± 0.2 K
4
2
5
3
8
6
1
7
NTC
30 kW
Voltage electrode 2
Current electrode 1
Voltage electrode 1
NTC
NTC
Current electrode 2
Shield
not used
Plug from the front: 4
5
7
38
2
6
1

Technical data TetraCon 325 / TetraCon 325/C
16 ba55301e04 01/2009

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Xylem Analytics Germany GmbH
Dr.-Karl-Slevogt-Str. 1
82362 Weilheim
Germany
Xylem Analytics Germany
Sales GmbH & Co. KG
WTW
Dr.-Karl-Slevogt-Str. 1
82362 Weilheim
Germany
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