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LRGT 1x-x - Installation & Operating Manual -
819877-00
Usage for the intended purpose
LRGT 16-3, LRGT 16-4 and LRGT 17-3 conductivity transmitters can be used as conductivity limiters and
continuous blowdown controllers to continually monitor conductivity in pressurised steam and hot-water
plants. They present a linear profile of conductivity in a preset measuring range via a 4-20 mA current
output.
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The transmitter’s secure 4-20 mA actual value output (SIL 2) can be used with a suitable conductivity
controller, as a continuous blowdown controller with MIN/MAX alarm, for example.
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To ensure problem-free operation, pay attention to the requirements for water quality as specified in
the technical rules (TRD) and EN standards for pressurised steam plants.
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The equipment may only be used within the admissible pressure and temperature ratings, see
“Technical data” on page 16 and “Name plate/Identification” on page 19.
Applicable directives and standards
LRGT 16-3, LRGT 16-4 and LRGT 17-3 conductivity transmitters have been tested and approved for use in
the scope governed by the following directives and standards:
Directives:
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Directive 2014/68/EU
EU Pressure Equipment Directive
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Directive 2014/35/EU
Low Voltage Directive
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Directive 2014/30/EU
EMC Directive
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Directive 2011/65/EU
RoHS II Directive
Standards:
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EN 60730-1
Automatic electrical controls – Part 1:
General requirements
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EN 61508
Functional safety of electronic systems
Standards documents:
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VdTÜV Bulletin BP WÜ 0100-RL
Requirements for the testing of water monitoring equipment
Technical rules for pressurised steam plants - as a knowledge base:
This Manual occasionally refers to the TRD regulations as a knowledge base.
These regulations have not been in force since 1 March 2019 and are no longer updated.
They have been replaced by the TRBS (German Technical Rules for Industrial Health &
Safety).
Always observe the current regulations (EU directives, EN standards, information from emplo-
yers’ liability insurance associations, etc.) in order to comply with the current state of the art.
