SMAR TT302 Manuel

T T 3 0 2 M E

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Introduction

INTRODUCTION

The TT302 is from the first generation of FIELDBUS devices. It is a transmitter mainly

intended for measurement of temperature using RTDs or thermocouples, but can also accept

other sensors with resistance or mV output such as: pyrometers, load cells, resistance position

indicators, etc. The digital technology used in the TT302 enables a single model to accept

several types of sensors, an easy interface between the field and the control room and several

others features that considerably reduces the installation, operation and maintenance costs.

FIELDBUS is not only a replacement for 4-20 mA or intelligent/smart transmitter protocols. It

contains much more. FIELDBUS is a complete system enabling distribution of the control

function to equipment in the field.

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

transmitter protocols: higher accuracy, multivariable access, remote configuration and

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

were not intended to transfer control data, but maintain information. Therefore they were slow

and not efficient enough to be used.

The main requirements for Fieldbus were to overcome these problems. Closed loop control

with performance like a 4-20 mA system requires higher speed. Since higher speed means

higher power consumption, this clashes with the need for intrinsic safety. Therefore a

moderately high communication speed was selected, and the system was designed to have

minimum communication overhead. Using scheduling, the system controls the variable

sampling, the algorithm execution and the communication to optimize the usage of the

network, thus achieving high closed loop performance.

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

control schemes can be constructed. In order to be user friendly, the function block concept

was introduced (users of SMAR CD600 should be familiar with this, since it was implemented

several years ago). The user may now easily build and overview complex control strategies.

Another advantage is adding flexibility, the control strategy may be edited without having to

rewire or change any hardware.

Now, thanks to Fieldbus, the transmitter accepts two channels, i.e., two measurements. This

reduces the cost per channel. Other function blocks are also available. They allow flexibility in

control strategy implementation.

The need for Fieldbus implementation 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.

Get the best result of the TT302 by carefully reading these instructions.

TT302 –Fieldbus Temperature Transmitter

WARNING

This Manual is compatible with version 3.XX, where 3 denote 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..................................................................................................................................................3.1

GENERAL.........................................................................................................................................................................3.1

MOUNTING......................................................................................................................................................................3.1

NETWORK WIRING.........................................................................................................................................................3.2

BUS TOPOLOGY AND NETWORK CONFIGURATION ..................................................................................................3.4

SENSOR WIRING............................................................................................................................................................3.5

INSTALLATION IN HAZARDOUS AREAS.......................................................................................................................3.7

EXPLOSION/FLAME PROOF ..........................................................................................................................................3.7

INTRINSICALLY SAFE.....................................................................................................................................................3.7

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

FUNCTIONAL DESCRIPTION –HARDWARE.................................................................................................................2.1

TEMPERATURE SENSORS............................................................................................................................................2.3

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

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

TRANSDUCER BLOCK PARAMETERS DESCRIPTION.................................................................................................3.1

TRANSDUCER BLOCK PARAMETERS TYPES .............................................................................................................3.2

HOW TO CONFIGURE A TRANSDUCER BLOCK..........................................................................................................3.3

SENSOR TRANSDUCER NUMBER................................................................................................................................3.4

JUMPER CONFIGURATION............................................................................................................................................3.4

SENSOR CONFIGURATION............................................................................................................................................3.4

HOW TO CONNECT TWO SENSORS TO TT302...........................................................................................................3.7

COMPENSATION OF LEAD RESISTANCE FOR DOUBLE SENSOR (RTD OR OHM)..................................................3.7

COLD JUNCTION COMPENSATION...............................................................................................................................3.8

CALIBRATION IN TT302 BY THE USER.........................................................................................................................3.8

CHANGING UNITS IN TEMPERATURE SENSORS......................................................................................................3.10

TRANSDUCER DISPLAY –CONFIGURATION.............................................................................................................3.10

DISPLAY TRANSDUCER BLOCK..................................................................................................................................3.11

DEFINITION OF PARAMETERS AND VALUES............................................................................................................3.11

PROGRAMMING USING LOCAL ADJUSTMENT..........................................................................................................3.14

J1 JUMPER CONNECTIONS.........................................................................................................................................3.15

W1 JUMPER CONNECTIONS.......................................................................................................................................3.15

LOCAL PROGRAMMING TREE.....................................................................................................................................3.16

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

TROUBLESHOUTING......................................................................................................................................................4.1

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

REASSEMBLY PROCEDURE..........................................................................................................................................4.2

INTERCHANGEABILITY..................................................................................................................................................4.3

RETURNING MATERIALS...............................................................................................................................................4.3

SECTION 5 - TECHNICAL CHARACTERISTIC.......................................................................................................................5.1

ORDERING CODE...........................................................................................................................................................5.4

APPENDIX A - CERTIFICATIONS INFORMATION................................................................................................................A.1

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

OTHER CERTIFICATIONS ............................................................................................................................................. A.1

DEVICE REGISTRATION ITK:........................................................................................................................................ A.1

NORTH AMERICAN CERTIFICATIONS......................................................................................................................................A.1

SOUTH AMERICAN CERTIFICATIONS......................................................................................................................................A.2

EUROPEAN CERTIFICATIONS..................................................................................................................................................A.2

ASIA CERTIFICATION................................................................................................................................................................A.2

IDENTIFICATION PLATE AND CONTROL DRAWING................................................................................................... A.2

IDENTIFICATION PLATE............................................................................................................................................................A.2

CONTROL DRAWING.................................................................................................................................................................A.6

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

TT302 –Fieldbus Temperature Transmitter

Installation Flowchart

VII

Installation Flowchart

Yes

Was the transmitter

configured on the bench

to match the application?

Configure the range and unit

(AI block)

Simule the value(s)

of the work range in the sensor(s)

conection terminal(s)

mV or Ohm

Start

Yes

Configure the

1 and

3 - Configuration)

sensor and its

connections (Section

Section

Configure the measuring type

(differantial, dual, backup, or single)

Configure the Damping (AI block)

(Section 3 - Configuration)

Configure the LCD reading

(Section 3 - Configuration)

See manual

(Section 5 - Maintenance)

Is the reading correct?

Check the area classification

and its practices.

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 5 - Maintenance)

Power the transmitter properly.

Is the transmitter

reading correct?

Do lower and upper trimTrim

Did you correct the

transmitter reading?

TT302 –Fieldbus Temperature Transmitter

VIII

Section1

1.1

INSTALLATION

General

The overall accuracy of temperature and other measurements depends on several variables.

Although the transmitter has an outstanding performance, proper installation is essential in order 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.

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

temperature fluctuation effects.

In warm environments, the transmitter should be installed in such a way as to avoid, as much as

possible, direct exposure to the sun. Installation close to lines and vessels subjected to high

temperatures should also be avoided. For temperature measurements, sensors with cooling-neck

can be used or the sensor can be mounted separately from the transmitter housing.

Use of sunshades or heat shields to protect the transmitter from external heat sources should be

considered.

Humidity is fatal for electronic circuits. In areas subjected to high relative humidity, the O-rings for

the electronic housing covers must be correctly placed and the covers must be completely closed by

tightening them by hand until you feel the O-rings being compressed. Do not use tools to close the

covers. Removal of the electronics cover in the field should be reduced to the minimum necessary,

since each time it is removed, the circuits are exposed to humidity. The electronic circuit is protected

by a humidity proof coating, but frequent exposure to humidity may affect the protection provided. It

is also important to keep the covers tightened in place. Every time they are removed, the threads

are exposed to corrosion, as painting cannot protect these parts. Code-approved sealing methods

should be employed on conduit entering the transmitter.

Connecting the sensor as close to the transmitter as possible and using proper wires (See Section 2

Operation), can decrease measurement error.

Mounting

The transmitter may be mounted in two basic ways:

Separated from the sensor, using optional mounting brackets.

Mounted on the sensor assembly.

It can be mounted in several different positions using the bracket, as shown in Figure 1.3 -

Dimensional Drawing and Mounting Positions. You can also see in the Figure 1.3 how the conduit

inlets for electrical connection are used to mount the sensor integral to the temperature transmitter.

For better visibility, the digital display may be rotated in steps of 90º. (See Figure 4.1 –Four

Possible Positions of the Display).

TT302 - Fieldbus Temperature Transmitter

1.2

Network Wiring

Access the terminal block by removing the Electrical Connection Cover. This cover can be locked

closed by the cover locking screw (See Figure 1.1 - Cover Locking).To release the cover, rotate the

locking screw clockwise.

COVER

LOCKING

SCREW

Figure 1.1 - Cover Locking

Cable access to wiring connections are obtained by one of the two conduit outlets. Conduit threads

should be sealed by means of code-approved sealing methods. The unused outlet connection

should be plugged accordingly.

The wiring block has screws on which fork or ring type terminals can be fastened. (See Figure 1.2 -

Ground Terminals).

Figure 1.2 - Ground Terminals

For convenience, there are three ground terminals: one inside the cover and two externally, located

close to the conduit entries.

WARNING

Do not connect the Fieldbus network wires to the sensor terminals. (Terminals 1, 2, 3 and 4).

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