SMAR LD292 Manuel

Introduction

III

INTRODUCTION

The LD292 is from the first generation of Fieldbus Devices. It is an economical alternative gauge

pressure transmitter. It is based on a field-proven capacitive sensor that provides reliable operation

and high performance. This lightweight design eliminates the need for mounting brackets and

transmitter supports in many applications. It’s microprocessor-based electronics allows total

interchangeability with Smar capacitive sensors. It is automatically corrects sensors characteristics

changes caused by temperature fluctuations. The digital technology used in the LD292 enables the

choice of several types of transfer functions, an easy interface between the field and the control

room and several interesting features that considerably reduce the installation, operation and

maintenance costs.

The LD292 is part of Smar's complete 302 line of Fieldbus devices.

Some of the advantages of bi-directional digital communications are known from existing smart

transmitter protocols: Higher accuracy, multi-variable access, remote configuration and diagnostics,

and multi-dropping of several devices on a single pair of wires.

Using Fieldbus technology, with its capability to interconnect several devices, very large control

schemes can be constructed. In order too be user friendly the function block concept was

introduced.

The LD292, like the rest of the 302 family, has some Function Blocks built in, like analog Input, PID

controller, Input selector and Display Block.

The need for implementation of Fieldbus in small as well as large systems was considered when

developing the entire 302 line of Fieldbus devices. They have the common features of being able to

act as a master on the network and be configured locally using a magnetic tool, eliminating the need

for a configurator or console in many basic applications.

The LD292 is available as a product on its own, but also replaces the circuit board for the LD291.

They use the same sensor board. Refer to the maintenance section of this manual for instructions

on upgrading. The LD292 uses the same hardware and housing for the LD291.The LD292 is part of

SMAR's Series 302 of Fieldbus devices.

The LD292, like its predecessor LD291, has many built-in blocks, eliminating the need for a

separate control device. The communication requirement is considerably reduced, and that means

less dead-time and tighter control is achieved, not to mention the reduction in cost. They allow

flexibility in control strategy implementation.

Get the best results of the LD292 by carefully reading these instructions.

LD292 - Operation and Maintenance Instruction Manual

NOTE

This Manual is compatible with version 3.XX, where 3 denotes software version and XX software release. The

indication 3.XX means that this manual is compatible with any release of software version 3.

Waiver of responsibility

The contents of this manual abides by the hardware and software used on the current equipment

version. Eventually there may occur divergencies between this manual and the equipment. The

information from this document are periodically reviewed and the necessary or identified corrections

will be included in the following editions. Suggestions for their improvement are welcome.

Warning

For more objectivity and clarity, this manual does not contain all the detailed information on the

product and, in addition, it does not cover every possible mounting, operation or maintenance

cases.

Before installing and utilizing the equipment, check if the model of the acquired equipment complies

with the technical requirements for the application. This checking is the user’s responsibility.

If the user needs more information, or on the event of specific problems not specified or treated in

this manual, the information should be sought from Smar. Furthermore, the user recognizes that the

contents of this manual by no means modify past or present agreements, confirmation or judicial

relationship, in whole or in part.

All of Smar’s obligation result from the purchasing agreement signed between the parties, which

includes the complete and sole valid warranty term. Contractual clauses related to the warranty are

not limited nor extended by virtue of the technical information contained in this manual.

Only qualified personnel are allowed to participate in the activities of mounting, electrical connection,

startup and maintenance of the equipment. Qualified personnel are understood to be the persons

familiar with the mounting, electrical connection, startup and operation of the equipment or other

similar apparatus that are technically fit for their work. Smar provides specific training to instruct and

qualify such professionals. However, each country must comply with the local safety procedures,

legal provisions and regulations for the mounting and operation of electrical installations, as well as

with the laws and regulations on classified areas, such as intrinsic safety, explosion proof, increased

safety and instrumented safety systems, among others.

The user is responsible for the incorrect or inadequate handling of equipments run with pneumatic

or hydraulic pressure or, still, subject to corrosive, aggressive or combustible products, since their

utilization may cause severe bodily harm and/or material damages.

The field equipment referred to in this manual, when acquired for classified or hazardous areas, has

its certification void when having its parts replaced or interchanged without functional and approval

tests by Smar or any of Smar authorized dealers, which are the competent companies for certifying

that the equipment in its entirety meets the applicable standards and regulations. The same is true

when converting the equipment of a communication protocol to another. In this case, it is necessary

sending the equipment to Smar or any of its authorized dealer. Moreover, the certificates are

different and the user is responsible for their correct use.

Always respect the instructions provided in the Manual. Smar is not responsible for any losses

and/or damages resulting from the inadequate use of its equipments. It is the user’s responsibility to

know and apply the safety practices in his country.

Table of Contents

TABLE OF CONTENTS

SECTION 1 - INSTALLATION .................................................................................................................. 1.1

GENERAL............................................................................................................................................................. 1.1

MOUNTING .......................................................................................................................................................... 1.1

ELECTRONIC HOUSING.....................................................................................................................................1.8

WIRING ................................................................................................................................................................ 1.9

BUS TOPOLOGY AND NETWORK CONFIGURATION ...................................................................................1.10

INTRINSIC SAFETY BARRIER ......................................................................................................................... 1.11

JUMPER CONFIGURATION..............................................................................................................................1.11

POWER SUPPLY............................................................................................................................................... 1.11

INSTALLATION IN HAZARDOUS AREAS ........................................................................................................1.12

EXPLOSION/FLAME PROOF............................................................................................................................ 1.12

INTRINSICALLY SAFE ......................................................................................................................................1.12

SECTION 2 - OPERATION ....................................................................................................................... 2.1

FUNCTIONAL DESCRIPTION - SENSOR .......................................................................................................... 2.1

FUNCTIONAL DESCRIPTION – ELECTRONICS ............................................................................................... 2.2

DISPLAY............................................................................................................................................................... 2.3

SECTION 3 - CONFIGURATION .............................................................................................................. 3.1

TRANSDUCER BLOCK .......................................................................................................................................3.1

HOW TO CONFIGURE A TRANSDUCER BLOCK ............................................................................................. 3.5

LOWER AND UPPER TRIM.................................................................................................................................3.5

PRESSURE TRIM - LD292 ..................................................................................................................................3.6

VIA LOCAL ADJUSTMENT..................................................................................................................................3.8

CHARACTERIZATION TRIM ............................................................................................................................... 3.9

SENSOR INFORMATION .................................................................................................................................. 3.11

TEMPERATURE TRIM....................................................................................................................................... 3.11

SENSOR DATA READING ................................................................................................................................3.12

TRANSDUCER DISPLAY – CONFIGURATION................................................................................................3.13

DISPLAY TRANSDUCER BLOCK .....................................................................................................................3.13

DEFINITION OF PARAMETERS AND VALUES ...............................................................................................3.14

PROGRAMMING USING LOCAL ADJUSTMENT.............................................................................................3.16

J1 JUMPER CONNECTIONS ............................................................................................................................3.17

W1 JUMPER CONNECTIONS........................................................................................................................... 3.17

SECTION 4 - MAINTENANCE PROCEDURES ........................................................................................ 4.1

GENERAL............................................................................................................................................................. 4.1

DISASSEMBLY PROCEDURE ............................................................................................................................4.2

SENSOR...........................................................................................................................................................................4.2

ELECTRONIC CIRCUIT ...................................................................................................................................................4.3

REASSEMBLE PROCEDURE .............................................................................................................................4.3

SENSOR...........................................................................................................................................................................4.3

ELECTRONIC CIRCUIT ...................................................................................................................................................4.3

INTERCHANGEABILITY...................................................................................................................................... 4.4

UPGRADING LD291 TO LD292 ..........................................................................................................................4.4

RETURNING MATERIALS................................................................................................................................... 4.4

ORDERING CODE FOR HOUSING ....................................................................................................................4.7

ORDERING CODE FOR SENSOR...................................................................................................................... 4.7

SECTION 5 - TECHNICAL CHARACTERISTICS ..................................................................................... 5.1

ORDERING CODE............................................................................................................................................... 5.5

APPENDIX A - CERTIFICATIONS INFORMATIONS ...............................................................................A.1

EUROPEAN DIRECTIVE INFORMATION...........................................................................................................A.1

HAZARDOUS LOCATIONS GENERAL INFORMATION ....................................................................................A.1

HAZARDOUS LOCATIONS CERTIFICATIONS ..................................................................................................A.2

LD292 - Operation and Maintenance Instruction Manual

NORTH AMERICAN CERTIFICATIONS ......................................................................................................................... A.2

EUROPEAN CERTIFICATIONS...................................................................................................................................... A.3

SOUTH AMERICAN CERTIFICATIONS.......................................................................................................................... A.4

ASIAN CERTIFICATIONS ............................................................................................................................................... A.4

IDENTIFICATION PLATES AND CONTROL DRAWINGS..................................................................................A.5

IDENTIFICATION PLATE................................................................................................................................................ A.5

CONTROL DRAWING ..................................................................................................................................................... A.9

APPENDIX B – SRF - SERVICE REQUEST FORM .................................................................................B.1

Installation Flowchart

VII

Yes

Apply the Zero Trim

Is the impulse line wett leg?

Install the transmitter on the field

following the instructions below.

Install the transmitter preferably

on weather- protected areas.

Install the transmitter (mechanically

and electrically) according to the

application after checking the best

position for the LCD

(Section 4 - Maintenance)

Check the area classification

and its practices

Power the transmitter properly.

Did you correct the

transmitter reading?

Is the transmitter

reading correct?

Yes No

Yes

Was the transmitter

configured on the bench

to match the application?

Configure the transmitter

(Section 1 and 3)

Configure the Fail-Safe

value (Section 3 - Configuration)

Configure the Damping

(Section 3 )- Configuration

Configure the LCD reading

(Section 3 )- Configuration

Apply the pressure

Is the reading correct?

See manual

(Section 4 )- Maintenance

Start

Yes

Configure the measuring range

to 0% (4mA) and 100% (20mA)

(Section 3 - Configuration)

Configure the engineering unit

(Section 3 - Configuration)

LD292 - Operation and Maintenance Instruction Manual

VIII

Section 1

1.1

INSTALLATION

General

NOTE

The installation carried out in hazardous areas should follow the recommendations of the

IEC60079-14 standard.

The overall accuracy of level or pressure measurement depends on several variables. Although the

transmitter has an outstanding performance, proper installation is essential to maximize its

performance.

Among all factors, which may affect transmitter accuracy, environmental conditions are the most

difficult to control. There are, however, ways of reducing the effects of temperature, humidity and

vibration.

The LD292 has a built-in temperature sensor to compensate for temperature variations. At the

factory, each transmitter is submitted to a temperature cycle process, and the characteristics under

different pressures and temperatures are recorded in the transmitter memory. At the field, this

feature minimizes the temperature variation effect.

Mounting

Locating the transmitter in areas protected from extreme environmental changes can minimize

temperature fluctuation effects.

The transmitter should be installed in such a way as to avoid, as much as possible, direct exposure

to the sun or any source of irradiated heat. Installation close to lines and vessels with high

temperatures should also be avoided. Use longer sections of impulse piping between tap and

transmitter whenever the process fluid is at high temperatures. Use of sunshades or heat shields to

protect the transmitter from external heat sources should be considered.

Proper winterization (freeze protection) should be employed to prevent freezing within the

measuring chamber, since this will result in an inoperative transmitter and could even damage the

cell.

Although the transmitter is virtually insensitive to vibration, installation close to pumps, turbines or

other vibrating equipment should be avoided.

The transmitter has been designed to be both rugged and lightweight at the same time. This makes

its mounting easier; mounting positions are shown in Figures 1.1 and 1.2.

Should the process fluid contain solids in suspension, install valves or rod-out fittings at regular

intervals to clean out the pipes.

The pipes should be internally cleaned by using steam or compressed air, or by draining the line

with the process fluid, before such lines are connected to the transmitter (blow-down).

NOTE

When installing or storing the level transmitter, the diaphragm must be protected to avoid

scratching-denting or perforation of its surface.

LD292 - Operation and Maintenance Instruction Manual

1.2

Figure 1.1 (a) - Dimensional Drawing and Mounting Position for LD292

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