VOLTCRAFT LWT-100 User guide
Operating manual
EN
LWT-100
Conductivity measuring device
Permanently connected graphite 2-pole measuring
cell
Waterproof
Precise and fast
Table of contents
Table of contents
1 Legal address of the manufacturer................................................................................................... 4
2 About this documentation ................................................................................................................. 5
2.1 Foreword............................................................................................................................................... 5
2.2 Purpose of the document...................................................................................................................... 5
2.3 Correctness of content.......................................................................................................................... 5
2.4 Layout of this document........................................................................................................................ 5
2.5 Further information ............................................................................................................................... 6
3 Safety ................................................................................................................................................... 7
3.1 Explanation of safety symbols .............................................................................................................. 7
3.2 Foreseeable misuse ............................................................................................................................. 7
3.3 Safety instructions ................................................................................................................................ 7
3.4 Intended use ......................................................................................................................................... 8
3.5 Qualified personnel............................................................................................................................... 8
4 Description .......................................................................................................................................... 9
4.1 Scope of delivery .................................................................................................................................. 9
4.2 Job description...................................................................................................................................... 9
5 The product at a glance ................................................................................................................... 10
5.1 The LWT-100...................................................................................................................................... 10
5.2 Display elements ................................................................................................................................ 10
5.3 Operating elements ............................................................................................................................ 10
6 Bases for measurement ................................................................................................................... 12
6.1 Conductivity principles ........................................................................................................................ 12
6.2 Conductivity measurement ................................................................................................................. 12
6.3 Total dissolved solids / TDS measurement ........................................................................................ 12
6.4 Salt content / salinity measurement.................................................................................................... 13
6.5 Electrodes / measuring cell................................................................................................................. 13
6.5.1 Design and selection .......................................................................................................................... 13
6.5.2 Calibration / adjustment of the measuring cell.................................................................................... 13
6.6 Temperature compensation................................................................................................................ 14
6.6.1 NLF temperature compensation according to EN 27888.................................................................... 14
7 Maintenance ...................................................................................................................................... 15
7.1 Operating and maintenance notices ................................................................................................... 15
7.2 Battery ................................................................................................................................................ 15
7.2.1 Battery indicator.................................................................................................................................. 15
7.2.2 Changing battery ................................................................................................................................ 15
8 Operation........................................................................................................................................... 17
8.1 Commissioning ................................................................................................................................... 17
8.1.1 Explanation ......................................................................................................................................... 17
8.2 Configuration ...................................................................................................................................... 17
8.2.1 Explanation ......................................................................................................................................... 17
8.2.2 Opening the configuration menu......................................................................................................... 17
8.2.3 Configuring parameters of the configuration menu............................................................................. 18
8.2.4 Adjustment of the measuring input ..................................................................................................... 20
8.2.5 Configuring parameters of the adjustment menu................................................................................ 20
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Table of contents
9 Error and system messages............................................................................................................ 23
10 Disposal............................................................................................................................................. 24
11 Technical data................................................................................................................................... 25
12 Service ............................................................................................................................................... 26
12.1 Manufacturer....................................................................................................................................... 26
B-H87.0.01.DB214-1.0 3 / 26
1 | Legal address of the manufacturer LWT-100
1 Legal address of the manufacturer
Conrad Electronic SE
Klaus-Conrad-Str. 1
D-92240 Hirschau
http://www.conrad.com
WEEE reg. no. DE 28001718
4 / 26 B-H87.0.01.DB214-1.0
LWT-100 About this documentation | 2
2 About this documentation
2.1 Foreword
Read this document carefully and familiarise yourself with the operation of the product
before you use it. Keep this document ready to hand and in the immediate vicinity of
the product so that it is available to the personnel/user for reference at all times in
case of doubt.
The product was developed according to the state of the art and fulfils the requirements of the applicable European and national Directives. All corresponding documents are available from the manufacturer.
Only technically qualified persons are permitted to carry out commissioning, operation,
maintenance and decommissioning. The qualified personnel must have carefully read
and understood the operating manual before beginning any work.
2.2 Purpose of the document
– This document describes the operation and maintenance of the product.
– Provides important information for working safely and efficiently with the product.
– In addition to the quick reference guide with all relevant legal and safety content in
hard copy, this document is a detailed reference option for the product.
2.3 Correctness of content
The contents of this document were checked for corrected and are subject to a continuous correction and updating process. This does not rule out potential errors. In the
event that errors are discovered or in case of suggestions for improvement, please inform us immediately via the indicated contact information in order to help us make this
document even more user-friendly.
2.4 Layout of this document
Description
Each chapter is explained at the beginning in the description.
Prerequisite
All mandatory prerequisites are then listed for each step.
Instruction
Tasks to be carried out by the personnel / user are represented as numbered instructions. Adhere to the sequence of the specified instructions.
Representation
Shows an illustrative instruction or a configuration of the product.
Formula
Some instructions include a formula for a general understanding of a configuration,
programming or a setting of the product.
B-H87.0.01.DB214-1.0 5 / 26
2 | About this documentation LWT-100
Outcome of an action
Result, consequence or effect of an instruction.
Emphases
In order to simplify legibility and provide a clearer overview, various sections / information are emphasised.
– 1234 Display elements
– Mechanical controls
– Product functions
– Product labels
– Cross-reference [}p.5]
– Foot notes
2.5 Further information
Software version of the product:
– V1.3 or later
For the exact product name, refer to the type plate on the rear side of the product.
NOTE
For information about the software version, press and hold the ON button to switch on
the product for longer than 5 seconds. The series is shown in the main display and the
software version of the product is shown in the secondary display.
6 / 26 B-H87.0.01.DB214-1.0
LWT-100 Safety | 3
3 Safety
3.1 Explanation of safety symbols
DANGER
This symbol warns of imminent danger which can result in death, severe bodily injury,
or severe property damage in case of non-observance.
CAUTION
This symbol warns of potential dangers or harmful situations which can cause damage
to the device or to the environment in case of non-observance.
NOTE
This symbol indicates processes which can have a direct influence on operation or
can trigger an unforeseen reaction in case of non-observance.
3.2 Foreseeable misuse
The fault-free function and operational safety of the product can only be guaranteed if
generally applicable safety precautions and the device-specific safety instructions for
this document are observed.
If these notices are disregarded, personal injury or death, as well as property damage
can occur.
DANGER
Incorrect area of application!
In order to prevent erratic behaviour of the product, personal injury or property damage, the product must be used exclusively as described in the chapter Description
[}p.9] in the operating manual.
– Do not use in safety / Emergency Stop devices!
– The product is not suitable for use in explosion-prone areas!
– The product must not be used for diagnostic or other medical purposes on pa-
tients!
– The product is not intended to come into direct contact with food. For measure-
ment in foods, samples must be taken and discarded after the measurement!
3.3 Safety instructions
This product has been designed and tested according to the safety requirements for
electronic measuring devices.
B-H87.0.01.DB214-1.0 7 / 26
3 | Safety LWT-100
CAUTION
Erratic behaviour!
On suspicion that the product can no longer be operated without danger, it must be
decommissioned and prevented from recommissioning with appropriate labelling. The
safety of the user can be impaired by the device if, for example, if it shows visible
damage, it no longer works as specified or if it was stored for an extended period of
time under unsuitable conditions.
– Visual inspection!
– In case of doubt, send the product to the manufacturer for repair or maintenance!
NOTE
If the product is stored at a temperature above 50 °C, or is not used for an extended
period of time, the batteries must be removed. Leaks from the batteries are avoided as
a result.
NOTE
This product does not belong in children's hands!
For this purpose, also refer to
2 Technical data [}25]
3.4 Intended use
The product is designed for measuring the conductivity in liquids. The measuring cell
is connected permanently.
See Technical data [}p.25].
3.5 Qualified personnel
For commissioning, operation and maintenance, the relevant personnel must have adequate knowledge of the measuring process and use of the measurements, for which
purpose this document makes a valuable contribution. The instructions in this document must be understood, observed and followed.
In order to ensure that no risks arise from the interpretation of the measurements in
the concrete application, the user must have additional technical knowledge, because
the user is liable in case of damage/danger due to misinterpretation as a result of inadequate technical knowledge.
8 / 26 B-H87.0.01.DB214-1.0
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