GESTRA LRS 1-50 User manual
EN (USA)
English
Conductivity Switch
LRS 1-50
Original Installation &
Operating Manual
850704-01
2LRS 1-50 - USA - Installation & Operating Manual - 850704-01
Contents
Content of this Manual......................................................................................................................... 4
Scope of supply, product package....................................................................................................... 4
How to use this Manual........................................................................................................................ 5
Illustrations and symbols used............................................................................................................ 5
Hazard symbols in this Manual............................................................................................................ 5
Types of warning .................................................................................................................................. 6
Specialist terms, abbreviations ........................................................................................................... 7
Usage for the intended purpose........................................................................................................... 8
Improper use ........................................................................................................................................ 8
Basic safety information ...................................................................................................................... 9
Required personnel qualifications..................................................................................................... 10
Notes on product liability................................................................................................................... 10
Function .............................................................................................................................................. 11
Technical data .................................................................................................................................... 12
Example rating plate/identification ................................................................................................... 13
Factory default settings ..................................................................................................................... 14
Dimensions of the LRS 1-50............................................................................................................... 15
Preparing for installation ................................................................................................................... 16
Installation.......................................................................................................................................... 17
In the control cabinet: Electrically connecting the conductivity switch.......................................... 18
Wiring diagram of conductivity switch LRS 1-50 ............................................................................ 18
Connecting the supply voltage ....................................................................................................... 19
Connecting the output contacts...................................................................................................... 19
Connecting conductivity electrode LRG 16-4.................................................................................. 19
Connecting conductivity electrode LRG 16-9.................................................................................. 19
In the plant: Electrically connecting the conductivity electrode ...................................................... 20
Connecting conductivity electrode LRG 16-4.................................................................................. 20
Connecting conductivity electrode LRG 16-9.................................................................................. 20
3LRS 1-50 - USA - Installation & Operating Manual - 850704-01
Contents
Changing the factory default settings ............................................................................................... 21
Changing the unit of measurement ................................................................................................ 21
Operating the conductivity switch..................................................................................................... 22
Meaning of codes on the 7-segment display.................................................................................. 22
Bringing into service .......................................................................................................................... 23
Setting parameters ........................................................................................................................ 23
Setting switchpoints and parameters ............................................................................................. 24
Operation, alarm and test................................................................................................................... 25
Password protection ...................................................................................................................... 26
Calibration ..................................................................................................................................... 27
Fault indications and troubleshooting............................................................................................... 28
Important notes .................................................................................................................................. 29
Action against high-frequency interference.................................................................................... 29
Taking out of service.......................................................................................................................... 30
Disposal .............................................................................................................................................. 30
UL components................................................................................................................................... 30
Declaration of Conformity
Standards and directives ................................................................................................................... 31
4LRS 1-50 - USA - Installation & Operating Manual - 850704-01
Content of this Manual
Product:
■ Conductivity Switch LRS 1-50
First edition:
BAN 850704-00/09-2021cm
© Copyright
All rights reserved. Any misuse, particularly reproduction and dissemination to third parties, is not
permitted. The General Terms & Conditions of GESTRA AG apply.
Scope of supply, product package
LRS 1-50
1 conductivity switch LRS 1-50
1 adhesive sign for ppm
1 Installation & Operating Manual
5LRS 1-50 - USA - Installation & Operating Manual - 850704-01
How to use this Manual
This Installation & Operating Manual describes the correct use of the LRS 1-50 conductivity switch.
It applies to persons who integrate this equipment in control systems, install, bring into service, op-
erate, maintain and dispose of this equipment. Anyone carrying out the above-mentioned activities
must have read this Installation & Operating Manual and understood its contents.
■ Read this Manual in full and follow all instructions.
■ Please also read the instructions for use of any accessories.
■ The Installation & Operating Manual is part of the product package. Keep it in an easily acces-
sible location.
Availability of this Installation & Operating Manual
■ Make sure this Installation & Operating Manual is always available to the operator.
■ If you pass on or sell the equipment to a third party, please also hand over the Installation &
Operating Manual.
Hazard symbols in this Manual
Danger zone, dangerous situation
Illustrations and symbols used
1. Action to be taken
2.
■ Lists
◆ Bullet points in lists
A Keys to illustrations
Additional
information
Read the relevant
Installation & Operating Manual
6LRS 1-50 - USA - Installation & Operating Manual - 850704-01
Types of warning
DANGER
Warning of a dangerous situation that results in death or serious injury.
WARNING
Warning of a dangerous situation that may possibly result in death or serious injury.
CAUTION
Warning of a situation that may result in minor or moderate injury.
ATTENTION
Warning of a situation that results in damage to property or the environment.
7LRS 1-50 - USA - Installation & Operating Manual - 850704-01
Specialist terms, abbreviations
Here, we explain some abbreviations, specialist terms, etc., which are used in this Manual.
NRGT .. / NRR.. / NRS.. / URS .. / URB .. / SRL .. / etc.
Equipment and type designations of GESTRA AG.
SELV
Safety Extra Low Voltage
Operating point (of the plant)
The operating point describes the operating parameters within which a plant or boiler is operated
in its nominal range. In a steam boiler, for example, these parameters would be output, pressure,
and temperature.
The design data may be a lot more stringent, however.
A boiler that is operated at 145psi (10bar) and 356°F (180°C) may be designed to withstand a
pressure of 870psi (60bar) and a temperature of 527°F (275°C), for example, which is therefore
not necessarily its operating point.
8LRS 1-50 - USA - Installation & Operating Manual - 850704-01
Usage for the intended purpose
The LRS 1-50 conductivity switch is used in combination with LRG 1.-.. conductivity electrodes
as a limit switch, e.g., in steam boilers and hot water installations or in condensate and feedwa-
ter tanks. The conductivity switch indicates when a MIN and MAX conductivity has been reached.
The LRS 1-50 is classified as an operating control in accordance with UL60730-1.
When used as intended, the LRS 1-50 conductivity switch can be combined in a circuit with the
LRG 16-4 and LRG 16-9 conductivity electrodes.
Improper use
There is a danger of death due to explosion if the equipment is used in potentially
explosive atmospheres.
Do not use the equipment in potentially explosive atmospheres.
Do not bring any equipment into service that does not have its own specific rating
plate.
The rating plate indicates the technical features of the equipment.
9LRS 1-50 - USA - Installation & Operating Manual - 850704-01
There is a risk of electric shock during work on electrical systems.
■ Always switch off the voltage to the plant before performing connection work.
■ Check that the plant is not carrying live voltage before commencing work.
Attempts to repair the equipment will cause the plant to become unsafe.
■ The LRS 1-50 conductivity switch may only be repaired by the manufacturer, GESTRA AG.
■ Only replace faulty equipment with identical equipment from GESTRA AG.
Basic safety information
10 LRS 1-50 - USA - Installation & Operating Manual - 850704-01
Required personnel qualifications
Activity Personnel
Integration in control system Specialist staff Plant designer
Installation/electrical connec-
tion/
bringing into service
Specialist staff
The equipment may only be installed, wired
and brought into service by qualified and
competent staff.
Operation Boiler service technician Staff trained by the plant operator.
Maintenance work Specialist staff
Fitting and maintenance work may only be
performed by authorized staff who have
undergone specific training.
Refits Specialist staff Persons trained by the plant operator to work
with pressure and temperature.
Notes on product liability
The manufacturer cannot accept any liability for damages resulting from improper use of the
equipment.
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