SMAR TT302 Manuel

TT302ME

web: www.smar.com

smar Specifications and information are subject to change without notice.

For the latest updates, please visit the SMAR website above.

BRAZIL

Smar Equipamentos Ind. Ltda.

Rua Dr. Antonio Furlan Jr., 1028

Sertãozinho SP 14170-480

Tel.: +55 16 3946-3510

Fax: +55 16 3946-3554

e-mail: [email protected]

CHINA

Smar China Corp.

3 Baishiqiao Road,Suite 30233

Beijing 100873, P.R.C.

Tel.: +86 10 6849-8643

Fax: +86-10-6894-0898

e-mail: [email protected]

FRANCE

Smar France S. A. R. L.

42, rue du Pavé des Gardes

F-92370 Chaville

Tel.: +33 1 41 15-0220

Fax: +33 1 41 15-0219

e-mail: [email protected]

NETHERLANDS

Smar Nederland

De Oude Wereld 116

2408TM Alphen aan den Rijn

Tel: +31 172 494 922

Fax: +31 172 479 888

e -mail : [email protected]l

GERMANY

Smar GmbH

Rheingaustrasse 9

55545 Bad Kreuznach

Germany

Tel: + 49 671-794680

Fax: + 49 671-7946829

e-mail: [email protected]

MEXICO

Smar Mexico

Cerro de las Campanas #3 desp 119

Col. San Andrés Atenco

Tlalnepantla Edo. Del Méx - C.P. 54040

Tel.: +53 78 46 00 al 02

Fax: +53 78 46 03

e-mail: [email protected]

SINGAPORE

Smar Singapore Pte. Ltd.

315 Outram Road

#06-07, Tan Boon Liat Building

Singapore 169074

Tel.: +65 6324-0182

Fax: +65 6324-0183

e-mail: [email protected]

UNITED KINGDOM

Smar UK Ltd

3, Overhill Road - Cirencester

Gloucestershire -

GL7 2LG

Tel: +44 (0)797 0094138

Fax: +44 (0)797 4747502

e-mail: [email protected]

USA

Smar International Corporation

6001 Stonington Street, Suite100

Houston, TX 77040

Tel.: +1 713 849-2021

Fax: +1 713 849-2022

e-mail: [email protected]

Smar Laboratories Corporation

6001 Stonington Street, Suite100

Houston, TX 77040

Tel.: +1 713 849-2021

Fax: +1 713 849-2022

e-mail: [email protected]

Smar Research Corporation

4250 Veterans Memorial Hwy. Suite 156

Holbrook , NY 11741

Tel: +1-631-737-3111

Fax: +1-631-737-3892

e-mail: [email protected]

Index

III

Table of Contents

INSTALLATION...........................................................................................1.1

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

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

NETWORKWIRING..................................................................................................................1.2

BUS TOPOLOGY AND NETWORK CONFIGURATION .............................................................1.4

OPERATION................................................................................................2.1

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

TEMPERATURE SENSOR........................................................................................................2.3

CONFIGURATION.......................................................................................3.1

TRANDUCER BLOCK...............................................................................................................3.1

HOW CONFIGURE A TRANSDUCER BLOCK...........................................................................3.1

SENSOR TRANSDUCER NUMBER..........................................................................................3.1

SENSOR WIRING.....................................................................................................................3.1

JUMPER CONFIGURATION.....................................................................................................3.3

SENSOR CONFIGURATION ....................................................................................................3.3

HOW TO CONNECT TWO SENSORS TO TT302......................................................................3.5

COMPENSATION OF LEAD RESISTANCE FOR RTD or Ohm...................................................3.5

COMPENSATION OF LEAD RESISTANCE FOR RTD or Ohm Double Sensors.........................3.6

CALIBRATION IN TT302 BY THE USER...................................................................................3.6

CHANGING UNITS IN TEMPERATURE SENSORS...................................................................3.7

TRANSDUCER DISPLAY – CONFIGURATION..........................................................................3.7

DISPLAY TRANSDUCER BLOCK .............................................................................................3.8

DEFINITION OF PARAMETERS AND VALUES.........................................................................3.9

PROGRAMMING USING LOCAL ADJUSTMENT.....................................................................3.12

J1 JUMPER CONNECTIONS..................................................................................................3.13

W1 JUMPER CONNECTIONS.................................................................................................3.13

LOCAL PROGRAMMING TREE..............................................................................................3.14

MAINTENANCE PROCEDURES ................................................................4.1

TOUBLESHOOUTING...............................................................................................................4.1

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

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

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

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

TECHNICAL CHARACTERISTICS..............................................................5.1

FUNCIONAL SPECIFICATIONS................................................................................................5.1

PERFORMANCE SPECIFICATIONS.........................................................................................5.1

PHYSICAL SPECIFICATIONS...................................................................................................5.2

APPENDIX................................................................................................................................5.4

TT302 – Fieldbus Temperature Transmitter

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.

Section 1

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.

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).

Installation

1.3

Figure 1.3 - Dimensional Drawing and Mounting Positions

The TT302 uses the 31.25-kbit/s voltage mode option for the physical signaling. All other devices on

the same bus must use the same signaling. All devices are connected in parallel along the same

pair of wires.

Various types of Fieldbus devices may be connected on the same bus. The TT302 is powered via

the bus. The limit for such devices is 16 for one bus for non-intrinsically safe requirement.

In hazardous areas, the number of devices may be limited to 6 devices by intrinsically safe

restrictions.

The TT302 is protected against reverse polarity, and can withstand ±35 VDC without damage.

Use of twisted pair cables is recommended. It is also recommended to ground shield of shielded

cables at one end only. The non-grounded end must be carefully isolated.

NOTE

Please refer to the General Installation, Operation and Maintenance

Manual for more details.

TT302 - Fieldbus Temperature Transmitter

1.4

Bus Topology and Network Configuration

Special requirements are applied to the terminator when used in a safety bus.

When intrinsic safety is required, a barrier should be inserted on the trunk between the power supply

and the terminator.

The barrier’s impedance should be greater than 460 Ωat 7.8 to 39 kHz.

The capacitance measured on both ends should not have a difference greater than 250pF from

each other.

The DF47 is recommended.

WARNING

HAZARDOUS AREAS

In hazardous areas with explosion proof requirements, the covers must be tightened with at least 8 turns. In

order to avoid the penetration moisture or corrosive gases, tighten the O’ring until feeling it touching the

housing. Then, tighten more 1/3 turn (120°) to guarantee the sealing. Lock the covers using the locking

screw.

In hazardous zones with intrinsically safe or non-incendive requirements, the circuit entity parameters and

applicable installation procedures must be observed.

Cable access to wiring connections is obtained by the two conduit outlets. Conduit threads should be sealed

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

accordingly.

Should other certifications be necessary, refer to the certification or specific standard for installation

limitations.

The connection of couplers should be kept at less than 15 per 250 m.

Figure 1.4 - Bus Topology

CORRECT

WIRES

INCORRECT

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