Spirax Sarco LSB31 User manual

IM-P372-27 CTLS Issue 2 1
LSB31, LSB32, LSB33, LSB34, LSB71, LSB72, LSB73 and LSB74 Limit Switch Boxes for BVA300 Series Actuators
LSB31, LSB32, LSB33 and LSB34
LSB71, LSB72, LSB73 and LSB74
1. Safety information
2. General product information
3. Installation
4. Wiring
5. Commissioning
6. Operation
7. Maintenance
8. Spare parts
© Copyright 2023
Printed in GB
LSB31, LSB32, LSB33, LSB34,
LSB71, LSB72, LSB73 and LSB74
Limit Switch Boxes for BVA300 Series Actuators
Installation and Maintenance Instructions
IM-P372-27
CTLS Issue 2

IM-P372-27 CTLS Issue 2
2
LSB31, LSB32, LSB33, LSB34, LSB71, LSB72, LSB73 and LSB74 Limit Switch Boxes for BVA300 Series Actuators
Safe operation of this product can only be guaranteed if it is properly installed, commissioned,
used and maintained by qualified personnel (see Section 1.11) in compliance with the operating
instructions. General installation and safety instructions for pipeline and plant construction, as
well as the proper use of tools and safety equipment must also be complied with.
Isolate the mains supply before carrying out any work on the switch box.
1.1 Intended use
Referring to the Installation and Maintenance Instructions, name-plate and Technical Information
Sheet, check that the product is suitable for the intended use / application. These products comply
with the requirements of the Pressure Equipment Directive (PED) and carry the mark when
so required.
i) Verify the limit switch box name plate to insure the respective unit has the correct mechanical,
inductive or pneumatic sensors. This is important as different switch boxes have different
internals.
ii) Check material suitability, pressure and temperature and their maximum and minimum values.
If the maximum operating limits of the product are lower than those of the system in which it
is being fitted, or if malfunction of the product could result in a dangerous overpressure or
overtemperature occurrence, ensure a safety device is included in the system to prevent such
over-limit situations.
iii) Spirax Sarco products are not intended to withstand external stresses that may be induced by
any system to which they are fitted. It is the responsibility of the installer to consider these
stresses and take adequate precautions to minimise them.
iv) Remove protection covers from all connections and protective film from all name-plates, where
appropriate, before installation on steam or other high temperature applications.
1.2 Access
Ensure safe access and if necessary a safe working platform (suitably guarded) before attempting
to work on the product. Arrange suitable lifting gear if required
1.3 Lighting
Ensure adequate lighting, particularly where detailed or intricate work is required.
1.4 Hazardous liquids or gases in the pipeline
Consider what is in the pipeline or what may have been in the pipeline at some previous time.
Consider: flammable materials, substances hazardous to health, extremes of temperature.
1.5 Hazardous environment around the product
Consider: explosion risk areas, lack of oxygen (e.g. tanks, pits), dangerous gases, extremes of
temperature, hot surfaces, fire hazard (e.g. during welding), excessive noise, moving machinery.
1. Safety information

IM-P372-27 CTLS Issue 2 3
LSB31, LSB32, LSB33, LSB34, LSB71, LSB72, LSB73 and LSB74 Limit Switch Boxes for BVA300 Series Actuators
1.6 The system
Consider the effect on the complete system of the work proposed. Will any proposed action (e.g.
closing isolation valves, electrical isolation) put any other part of the system or any personnel
at risk?
Dangers might include isolation of vents or protective devices or the rendering ineffective of
controls or alarms. Ensure isolation valves are turned on and off in a gradual way to avoid system
shocks.
1.7 Pressure systems
Ensure that any pressure is isolated and safely vented to atmospheric pressure. Consider double
isolation (double block and bleed) and the locking or labelling of closed valves. Do not assume
that the system has depressurised even when the pressure gauge indicates zero.
1.8 Temperature
Allow time for temperature to normalise after isolation to avoid danger of burns.
1.9 Tools and consumables
Before starting work ensure that you have suitable tools and / or consumables available. Use only
genuine Spirax Sarco replacement parts.
1.10 Protective clothing
Consider whether you and/or others in the vicinity require any protective clothing to protect
against the hazards of, for example, chemicals, high /low temperature, radiation, noise, falling
objects, and dangers to eyes and face.
1.11 Permits to work
All work must be carried out or be supervised by a suitably competent person.
Installation and operating personnel should be trained in the correct use of the product according
to the Installation and Maintenance Instructions.
Where a formal 'permit to work' system is in force it must be complied with. Where there is no
such system, it is recommended that a responsible person should know what work is going on
and, where necessary, arrange to have an assistant whose primary responsibility is safety.
Post 'warning notices' if necessary.
1.12 Handling
Manual handling of large and /or heavy products may present a risk of injury. Lifting, pushing,
pulling, carrying or supporting a load by bodily force can cause injury particularly to the back.
You are advised to assess the risks taking into account the task, the individual, the load and the
working environment and use the appropriate handling method depending on the circumstances
of the work being done.
1.13 Residual hazards
In normal use the external surface of the product may be very hot. If used at the maximum
permitted operating conditions the surface temperature of this product may reach temperatures
of 100 °C (212 °F).
This product is not self-draining. Take due care when dismantling or removing the product from
an installation (refer to 'Maintenance instructions').

IM-P372-27 CTLS Issue 2
4
LSB31, LSB32, LSB33, LSB34, LSB71, LSB72, LSB73 and LSB74 Limit Switch Boxes for BVA300 Series Actuators
1.14 Freezing
Provision must be made to protect products which are not self-draining against frost damage in
environments where they may be exposed to temperatures below freezing point.
1.15 Disposal
Unless otherwise stated in the Installation and Maintenance Instructions, this product is
recyclable and no ecological hazard is anticipated with its disposal providing due care is taken.
1.16 Returning products
Customers and stockists are reminded that under EC Health, Safety and Environment Law, when
returning products to Spirax Sarco they must provide information on any hazards and the
precautions to be taken due to contamination residues or mechanical damage which may present
a health, safety or environmental risk. This information must be provided in writing including
Health and Safety data sheets relating to any substances identified as hazardous or potentially
hazardous.

IM-P372-27 CTLS Issue 2 5
LSB31, LSB32, LSB33, LSB34, LSB71, LSB72, LSB73 and LSB74 Limit Switch Boxes for BVA300 Series Actuators
2.1 General description
LSB limit switch boxes are normally used for indicating valve open or valve closed position. They also allow
switching points to be adjustable over the full range of actuators. There is an open/closed valve position
indicator mounted at the end of the switch box axis, at the top of the cover. LSB's include a stainless steel
linkage kit for direct mounting to BVA300 series actuators.
Available limit switch boxes:
LSB31 Contact switches (2 x SPDT)
LSB71 Contact switches (2 x SPDT)
Explosion proof Exd IIC T6
LSB32 10 - 30 Vdc 3-wire proximity sensors (2 x Autonics PS17-5DNU, NPN)
LSB72 10 - 30 Vdc 3-wire proximity sensors (2 x Autonics PS17-5DNU, NPN)
Explosion proof Exd IIC T6
LSB33 8 Vdc 2-wire proximity sensors (2 x P&F NJ2-V3-N; intrinsically safe)
LSB73 8 Vdc 2-wire proximity sensors (2 x P&F NJ2-V3-N; intrinsically safe)
Explosion proof Exd IIC T6
LSB34 5 - 60 Vdc 2-wire proximity sensors (2 x P&F NBB3-V3-Z4)
LSB74 5 - 60 Vdc 2-wire proximity sensors (2 x P&F NBB3-V3-Z4)
Explosion proof Exd IIC T6
Note: For further information on this product see Technical Information sheet TI-P372-26.
Fig. 1 LSB31, LSB32, LSB33 and LSB34 Fig. 2 LSB71, LSB72, LSB73 and LSB74
2. General product information

IM-P372-27 CTLS Issue 2
6
LSB31, LSB32, LSB33, LSB34, LSB71, LSB72, LSB73 and LSB74 Limit Switch Boxes for BVA300 Series Actuators
2.2 Technical data
Standard Optional
Protection
LSB3_ IP67 IP68
LSB7_ Explosion proof Exd IIC T6, IP67 IP68
Outer cover Epoxy - polyester Nylon
Room temperature -20 °C to +80 °C -40 °C to +100 °C
Connection socket 8 terminals
Position indicator 0° to 90° dome type 3-way L-port, T-port
Mounting kit NAMUR, SS1 or SS2 stainless steel SS3, MT1
Switch sensor Mechanical 2-SPDT
LSB3_
Proximity sensors - P&F
Autonics, Magnetic
Magnetic sensor
LSB7_
DPDT switches
Proximity sensors -
P&F Autonics, Magnetic
Magnetic sensors
Position transmitter
(output 0-1 Kohm, 4-20 mA dc)
Case Cast aluminum Stainless steel 316L *
Nomenclature
LSB3_
LSB7_
LSB7_S
LSB7_S
* Stainless Steel case not available for LSB3_

IM-P372-27 CTLS Issue 2 7
LSB31, LSB32, LSB33, LSB34, LSB71, LSB72, LSB73 and LSB74 Limit Switch Boxes for BVA300 Series Actuators
Note: Before actioning any installation observe the 'Safety information' in Section 1.
3.1 General installation
The box is supplied with a stainless steel mounting bracket, which may be mounted on any actuator having
a NAMUR VDI/VDE 3845 interface.
- Manually turn the box shaft to align it with the actuator before engaging the drive shaft.
- Fasten the box to the actuator using the bolts provided.
3.2 Cam adjustment - If required
All units are supplied with 0º - 90º cam adjustment:
- Loosen the 4 cover screws and remove the cover.
- Readjust the cams to the position required.
3. Installation

IM-P372-27 CTLS Issue 2
8
LSB31, LSB32, LSB33, LSB34, LSB71, LSB72, LSB73 and LSB74 Limit Switch Boxes for BVA300 Series Actuators
Fig. 3 LSB31
(for other sensors contact Spirax Sarco)
4. Wiring
Open switch
Close switch
Ground
Solenoid valve
Blue
Green
Yellow
White
Black
Red
Close Open Ext
Caution - The following instructions must be carried out carefully to maintain the validity of the IP
rating:
- Remove the cover to introduce the cable through the gland and connect the wires to the terminal strip
according to the electrical wiring sticker on the external side of the LSB unit.
- Reassemble the lid after carefully placing the gasket between the cover and the box enclosure.
- Tighten the gland closer.
Mechanical switch

IM-P372-27 CTLS Issue 2 9
LSB31, LSB32, LSB33, LSB34, LSB71, LSB72, LSB73 and LSB74 Limit Switch Boxes for BVA300 Series Actuators
Fig. 4 LSB71
(for other sensors contact Spirax Sarco)
SPDT Limit switch
Input signal
Max 300 Vdc/Vac
Ground Approval
cable gland
Earth (external)
Earth (internal)
Screw : M4 x 6L with M4 spring washer
Use crimp terminal
Minimum size : 1 mm2wire
SPDT2 "NO"
SPDT2 "C"
SPDT2 "NC"
SPDT1 "NO"
SPDT1 "C"
SPDT1 "NC"
8
7
6
5
4
3
2
1

IM-P372-27 CTLS Issue 2
10
LSB31, LSB32, LSB33, LSB34, LSB71, LSB72, LSB73 and LSB74 Limit Switch Boxes for BVA300 Series Actuators
No maintenance is required. Switch setting can be checked periodically.
After installation or maintenance ensure that the system is fully functioning. Carry out tests on any alarms
or protective devices.
LSB limit switch boxes are normally used for indicating valve open or valve closed position. They also allow
switching points to be adjustable over the full range of actuators.
There are no available spare parts for these units.
5. Commissioning
6. Operation
7. Maintenance
8. Spare parts

IM-P372-27 CTLS Issue 2 11
LSB31, LSB32, LSB33, LSB34, LSB71, LSB72, LSB73 and LSB74 Limit Switch Boxes for BVA300 Series Actuators

IM-P372-27 CTLS Issue 2
12
LSB31, LSB32, LSB33, LSB34, LSB71, LSB72, LSB73 and LSB74 Limit Switch Boxes for BVA300 Series Actuators