Siemens SITRANS LH300 Compact Operating Instructions
© Siemens AG 2016. All rights reserved
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3
SITRANS
Pressure transmitter
SITRANS LH300 (7MF1575..) Transmitter for hydrostatic level
Compact Operating Instructions
Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent damage to property. The
notices referring to your personal safety are highlighted in the manual by a safety alert symbol, notices referring only to property damage
have no safety alert symbol. These notices shown below are graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will be used. A notice warning of
injury to persons with a safety alert symbol may also include a warning relating to property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by
personnel qualified
for the specific task in accordance with
the relevant documentation, in particular its warning notices and safety instructions. Qualified personnel are those who, based on their
training and experience, are capable of identifying risks and avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical documentation. If products
and components from other manufacturers are used, these must be recommended or approved by Siemens. Proper transport, storage,
installation, assembly, commissioning, operation and maintenance are required to ensure that the products operate safely and without any
problems. The permissible ambient conditions must be complied with. The information in the relevant documentation must be observed.
1
Introduction
1.1
Purpose of this documentation
These instructions contain all information required to commission and use the device. Read the instructions carefully prior to
installation and commissioning. In order to use the device correctly, first review its principle of operation.
The instructions are aimed at persons mechanically installing the device, connecting it electronically, configuring the
parameters and commissioning it, as well as service and maintenance engineers.
See also
Technical support (Page 21)
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1.2
Checking the consignment
1. Check the packaging and the delivered items for visible damage.
2. Report any claims for damages immediately to the shipping company.
3. Retain damaged parts for clarification.
4. Check the scope of delivery by comparing your order to the shipping documents for correctness and completeness.
WARNING
Using a damaged or incomplete device
Risk of explosion in hazardous areas.
•
Do not use damaged or incomplete devices.
1.3
Transportation and storage
To guarantee sufficient protection during transport and storage, observe the following:
● Keep the original packaging for subsequent transportation.
● Devices/replacement parts should be returned in their original packaging.
● If the original packaging is no longer available, ensure that all shipments are properly packaged to provide sufficient
protection during transport. Siemens cannot assume liability for any costs associated with transportation damages.
CAUTION
Insufficient protection during storage
The packaging only provides limited protection against moisture and infiltration.
•
Provide additional packaging as necessary.
Special conditions for storage and transportation of the device are listed in Technical specifications (Page 15).
1.4
Notes on warranty
The contents of this manual shall not become part of or modify any prior or existing agreement, commitment or legal
relationship. The sales contract contains all obligations on the part of Siemens as well as the complete and solely applicable
warranty conditions. Any statements regarding device versions described in the manual do not create new warranties or
modify the existing warranty.
The content reflects the technical status at the time of publishing. Siemens reserves the right to make technical changes in
the course of further development.
2
Safety instructions
2.1
Prerequisites for safe use
This device left the factory in good working condition. In order to maintain this status and to ensure safe operation of the
device, observe these instructions and all the specifications relevant to safety.
Observe the information and symbols on the device. Do not remove any information or symbols from the device. Always
keep the information and symbols in a completely legible state.
Symbol
Explanation
Consult operating instructions
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2.1.1
Laws and directives
Observe the test certification, provisions and laws applicable in your country during connection, assembly and operation.
These include, for example:
● National Electrical Code (NEC - NFPA 70) (USA)
● Canadian Electrical Code (CEC) (Canada)
Further provisions for hazardous area applications are for example:
● IEC 60079-14 (international)
● EN 60079-14 (EC)
2.1.2
Conformity with European directives
The CE mark on the device is a sign of conformity with the following European directives:
Electromagnetic compat
ibility EMC
2014/30/EU
Directive of the European Parliament and of the Council on the harmonisation of the
laws of the Member States relating to electromagnetic compatibility.
Atmosphère explosible ATEX
2014/34/EU
Directive of the European Parliament an
d of the Council on the harmonisation of the
laws of the Member States relating to equipment and protective systems intended for
use in potentially explosive atmospheres.
The standards applied can be found in the EC declaration of conformity for the device.
2.2
Improper device modifications
WARNING
Improper device modifications
Risk to personnel, system and environment can result from modifications to the device, particularly in hazardous areas.
• Only carry out modifications that are described in the instructions for the device. Failure to observe this requirement
cancels the manufacturer's warranty and the product approvals.
2.3
Requirements for special applications
Due to the large number of possible applications, each detail of the described device versions for each possible scenario
during commissioning, operation, maintenance or operation in systems cannot be considered in the instructions. If you need
additional information not covered by these instructions, contact your local Siemens office or company representative.
Note
Operation under special ambient conditions
We highly recommend that you contact your Siemens representative or our application department be
fore you operate the
device under special ambient conditions as can be encountered in nuclear power plants or when the device is used for
research and development purposes.
2.4
Use in hazardous areas
2.4.1
Qualified personnel for hazardous area applications
Qualified personnel for hazardous area applications
Persons who install, connect, commission, operate, and service the device in a hazardous area must have the following
specific qualifications:
● They are authorized, trained or instructed in operating and maintaining devices and systems according to the safety
regulations for electrical circuits, high pressures, aggressive, and hazardous media.
● They are authorized, trained, or instructed in carrying out work on electrical circuits for hazardous systems.
● They are trained or instructed in maintenance and use of appropriate safety equipment according to the pertinent safety
regulations.
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WARNING
Unsuitable device for the hazardous area
Risk of explosion.
• Only use equipment that is approved for use in the intended hazardous area and labelled accordingly.
See also
Technical specifications (Page 15)
WARNING
Loss of safety of device with type of protection "Intrinsic safety Ex i"
If the device has already been operated in non-intrinsically safe circuits or the electrical specifications have not been
observed, the safety of the device is no longer ensured for use in hazardous areas. There is a risk of explosion.
• Connect the device with type of protection "Intrinsic safety" solely to an intrinsically safe circuit.
• Observe the specifications for the electrical data on the certificate and/or in Technical specifications (Page 15).
3
Description
3.1
Application range
The LH300 pressure transmitter is a submersible sensor for hydrostatic level measurement. The pressure transmitter
measures the liquid levels in tanks, containers, channels and dams.
The pressure transmitter is available for various measuring ranges and optionally with explosion protection. A cable box and
an anchor clamp are available as accessories to make installation easier.
The pressure transmitter is used, for example, in the following industrial areas:
● Water supply
● For use in pressureless/open tanks and wells
3.2
Structure
The pressure transmitter has a built-in ceramic sensor which is equipped with a Wheatstone resistance bridge.
The pressure transmitter is equipped with electronics that is installed, together with the sensor, in a stainless steel
enclosure. There is also a vent pipe in the connecting cable.
The measuring diaphragm is effectively protected against external influences by a protective cover.
The sensor, the electronics and the connecting cable are housed in an enclosure with small dimensions.
The pressure transmitter is suitable for a wide temperature range.
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3.3
Design of the nameplate
①
Article number
⑤
Type of protection
②
Characteristics for hazardous area
⑥
Group (gas, dust)
③
Serial number
⑦
Maximum surface temperature (temperature class)
④
Category for operating area
⑧
Group (gas)
Figure 3-1 Example of a nameplate
The pressure transmitter has a nameplate with the article number and other important information, such as design details
and technical specifications.
You must also observe the information in the relevant certificate for a transmitter version for use in hazardous areas.
3.4
Mode of operation
①
Sensor
①
Protective conductor connection/
Equipotential bonding
②
Connection for auxiliary power supply
②
Hydrostatic pressure
③
Vent pipe
Figure 3-2 Pressure transmitter, mode of operation and wiring diagram
On one side of the sensor
① the diaphragm is exposed to the hydrostatic pressure ⑤, which is proportional to the
immersion depth. This pressure is compared with the atmospheric pressure. Pressure compensation is carried out using the
vent pipe ③ in the connecting cable.
The hydrostatic pressure of the liquid column acts on the diaphragm of the sensor and transmits the pressure to the
Wheatstone resistance bridge in the sensor.
The output voltage signal of the sensor is fed to the electronics, where it is converted into an output current signal of 4 mA to
20 mA.
The protective conductor connection/equipotential bonding ④ is connected to the enclosure.
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Installing/mounting
4.1
Basic safety instructions
WARNING
Wetted parts unsuitable for the process media
Risk of injury or damage to device.
Hot, toxic and corrosive media could be released if the process medium is unsuitable for the wetted parts.
• Ensure that the material of the device parts wetted by the process medium is suitable for the medium. Refer to the
information in Technical specifications (Page 15).
Note
Material compatibility
Siemens can provide you with support concerning selection of sensor components wetted by process media. However, you
are responsible for the selection of components. Siemens accepts no liability for faults or failures resulting from incompatible
materials.
4.1.1
Exceeded maximum permissible operating pressure
WARNING
Exceeded maximum permissible operating pressure
Risk of injury or poisoning.
The maximum permissible operating pressure depends on the device version, pressure limit and temperature rating. The
device can be damaged if the operating pressure is exceeded. Hot, toxic and corrosive process media could be released.
Ensure that maximum permissible operating pressure of the device is not exceeded. Refer to the information on the
nameplate and/or in Technical specifications (Page 15).
NOTICE
Using a device with frozen process medium
Damage to the device through ice formation.
•
Prevent ice formation on the pressure transmitter. The process medium must not freeze.
4.1.2
Proper mounting
NOTICE
Incorrect mounting
The device can be damaged, destroyed, or its functionality impaired through improper mounting.
• Before installing ensure there is no visible damage to the device.
• Make sure that process connectors are clean, and suitable gaskets and glands are used.
• Mount the device using suitable tools. Refer to the information in Technical specifications (Page 15) for installation
torque requirements.
CAUTION
Loss of type of protection
Damage to device if the enclosure is open or not properly closed. The type of protection specified on the nameplate or in
Technical specifications (Page 15) is no longer guaranteed.
• Make sure that the device is securely closed.
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