Siemens SITRANS LH300 Guía del administrador

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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.

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.

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

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).

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 ①the 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 ③in 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 ④is 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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See also

Installing/mounting (Page 8)

4.2

Installation

①

Level

②

Measurement reference height

Figure 4-1 Mounting the pressure transmitter (example with protective cover made of PPE)

1. Install the pressure transmitter suspended downward on the cable.

2. To prevent measuring errors, fasten the pressure transmitter for moved process media.

3. Fasten the pressure transmitter by means of a guide tube or an additional weight on the transmitter (max. tensile force

on connecting cable 360 N).

4. Fasten the cable above the container with the anchor clamp.

5. Connect the cable itself with the cable box.

6. Mount the cable box at a location appropriate to its degree of protection (IP66) in the vicinity of the measuring point.

7. To ensure proper functioning, make sure that the entry openings on the protective cover of the pressure transmitter do

not get soiled and that the process medium does not freeze on the pressure transmitter.

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4.3

Setting up the measuring points

①

Cable box

③

Pressure transmitter

②

Anchor clamp

Figure 4-2 Setting up the measuring points

4.4

Establishing the measuring range

Calculating the measuring range with process media with a density ≠1000 kg/m3 (process medium ≠water)

p = ρ* g * h

with:

ρ= density of the process medium

g = local gravitational acceleration

h = maximum level

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Connecting

5.1

Basic safety instructions

WARNING

Maximum cable length exceeded for devices with type of protection "Intrinsic safety Ex i"

Danger of explosion in hazardous areas.

Observe the maximum permissible cable length in order to comply with the requirements for devices with type of protection

"Intrinsic safety Ex i".

WARNING

Unsuitable cables, cable glands and/or plugs

Risk of explosion in hazardous areas.

•Use only cable glands/plugs that comply with the requirements for the relevant type of protection.

•Tighten the cable glands in accordance with the torques specified in Technical specifications (Page 15).

•Close unused cable inlets for the electrical connections.

•When replacing cable glands use only cable glands of the same type.

•

After installation check that the cables are seated firmly.

WARNING

Improper power supply

Danger of explosion in hazardous areas and loss of device safety as a result of incorrect power supply, e.g. using direct

current instead of alternating current.

•Connect the device in accordance with the specified power supply and signal circuits. The relevant specifications can

be found in the certificates, in Chapter "Technical specifications (Page 15)" or on the nameplate.

•Always power the device with limited energy. Observe the following standards on limited energy: UL61010-1 3rd

Edition, Section 9.3 or LPS (Low Power Supply) in accordance with UL60950-1 or Class 2 in accordance with UL1310

or UL1585.

WARNING

Unsafe extra-low voltage

Risk of explosion in hazardous areas due to voltage flashover.

•

Connect the device to an extra-low voltage with safe isolation (SELV).

WARNING

Lack of equipotential bonding

Risk of explosion through compensating currents or ignition currents through lack of equipotential bonding.

•Ensure that the device is potentially equalized.

Exception

: It may be permissible to omit connection of the equipotential bonding for devices with type of protection

"Intrinsic safety Ex i".

WARNING

Unprotected cable ends

Risk of explosion through unprotected cable ends in hazardous areas.

•

Protect unused cable ends in accordance with IEC/EN 60079-14.

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WARNING

Improper laying of shielded cables

Risk of explosion through compensating currents between hazardous area and the non-hazardous area.

•Shielded cables that cross into hazardous areas should be grounded only at one end.

•

If grounding is required at both ends, use an equipotential bonding conductor.

WARNING

Connecting device in energized state

Risk of explosion in hazardous areas.

•Connect devices in hazardous areas only in a de-energized state.

Exceptions

•Devices having the type of protection "Intrinsic safety Ex i" may also be connected in energized state in hazardous

areas.

•

Exceptions for type of protection "Non-sparking nA" (Zone 2) are regulated in the relevant certificate.

Note

Electromagnetic compatibility (EMC)

You can use this device in industrial environments, households and small businesses.

For metal housings there is an increased electromagnetic compatibility compared to high

-frequency radiation. This

protection can be increased by grounding the housing, see

Connecting (Page 11).

Note

Improvement of interference immunity

•

Lay signal cables separately to cables with voltages > 60 V.

•

Use cable with twisted wires.

•Keep the device and the cables at a distance from strong electromagnetic fields.

5.2

Connecting the device

Procedure

Connect the pressure transmitter to the cable box as follows:

1. Connect the cable of the pressure transmitter to the terminals 1 (-), 2 (+) and the grounding.

2. Insert the vent pipe into the cable box.

The vent pipe must be open to the atmosphere. The watertight filter present on the cable box housing serves for this

purpose.

①

Brown

③

Blue

②

Black

④

Protective conductor connection/equipotential bonding

Figure 5-1 Electrical connection

Example

In the case of applications in non-hazardous areas, you can connect the pressure transmitter as follows:

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