Sierra 640S-EEX, 780S-EEX Instruction Manual

Appendix for ATEX

Certified EX Units

Instruction Manual

Sierra Instruments’ Model 640S-EEX and 780S-

EEX Flow Transmitters

Part Number: IM-ATEX, Rev. C.1 October 2013

GLOBAL SUPPORT LOCATIONS: WE ARE HERE TO HELP!

CORPORATE HEADQUARTERS

5 Harris Court, Building L Monterey, CA 93940
Phone [phone] [phone] Fax [phone]

www.sierrainstruments.com

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Pu Dong New District, Shanghai, P.R. China
Phone: + 8621 5879 8521 Fax: [phone]

IMPORTANT CUSTOMER NOTICE- OXYGEN SERVICE

Sierra Instruments, Inc. is not liable for any damage or personal injury, whatsoever, resulting from the use of Sierra
Instruments standard mass flow meters for oxygen gas. You are responsible for determining if this mass flow meter is
appropriate for your oxygen application. You are responsible for cleaning the mass flow meter to the degree required
for your oxygen flow application.

© COPYRIGHT SIERRA INSTRUMENTS 2013

No part of this publication may be copied or distributed, transmitted, transcribed, stored in a retrieval system, or
translated into any human or computer language, in any form or by any means, electronic, mechanical, manual, or
otherwise, or disclosed to third parties without the express written permission of Sierra Instruments. The information
contained in this manual is subject to change without notice.

TRADEMARKS

Steel-Trak® and Smart Interface™ software are trademarks of Sierra Instruments, Inc. Other product and company
names listed in this manual are trademarks or trade names of their respective manufacturers.

Revision C: clarify instructions for current zero and current span adjustments, add information on non-isolated 4­20mA outputs, add maximum temperature for probe mounted electronics, add cable resistance value in Sensor
Validation procedure.

Sierra Instruction Manual ATEX Certified Units: 640S-EEX & 780S-EEX

Contents

1. Labeling .............................................................................................................4

2. Type Approval Standards .................................................................................5

3. Zone, Gas Group, Category and Temperature class ......................................5

3.1. Area Classification .......................................................................................5

3.2. Gas Grouping ..............................................................................................5

3.3. Equipment Category ....................................................................................5

3.4. Temperature Classification ..........................................................................6

3.5. Ambient Temperature Range ......................................................................6

4. Safe Use of ATEX Approved Equipment ..........................................................6

4.1. Notes on Safe Use of the ATEX Approved Equipment ................................6

4.2. Mounting, Commissioning, and Operation ..................................................6

4.3. Explosive Hazardous Area ..........................................................................6

4.4. Special Conditions for a Safe Use ...............................................................7

4.5. Particular Recommendations: Closing the Cover ........................................7

5. Remote Electronics ...........................................................................................8

6. Maintenance.......................................................................................................9

6.1. External Maintenance ..................................................................................9

6.2. Sensor Maintenance ...................................................................................9

6.3. Internal Maintenance ...................................................................................9

7. Earthing ..............................................................................................................9

7.1. External Earthing .........................................................................................9

7.2. Internal Earthing ..........................................................................................9

8. Warning ..............................................................................................................9

9. Returning Equipment to Factory .................................................................... 10

Addendum: Installation Instructions Cable Gland .................................................... 11

This is a certified ATEX document. Changes must be approved by the
Sierra Instrument’s ”ATEX Authorized Person”

Page 3 of 15

Sierra Instruction Manual ATEX Certified Units: 640S-EEX & 780S-EEX

1. Labeling

Sierra Instruments Model 640S-EEX and 780S-EEX Flow Transmitters that have the following
label attached have been certified in compliance with the Directive 94/9/EC of the European
Parliament and the Council as published in the Official Journal of the European Communities
No. L 100/1 on 19 April 1994.

KEMA ATEX official label from Sierra Instruments, Inc.

The following information is provided as part of the labeling of the transmitter:

• Name and address of the manufacturer: Sierra Instruments, Inc., 5 Harris Court, Building L,

Monterey, CA 93940, USA, Ph. 831-373-0200, Fax [phone]

• The serial number of the device

• Year of construction

• Model Number

• CE Mark

• Marking for explosion protection: ATEX II 2 GD EX d IIC T6-T2 T280°C (Suitable for Use in

Zone 1 Gas and Dust applications)

• KEMA ATEX certificate number: 06ATEX0105

• Cable entry treads information (3/4” NPT) and housing IP rating

Page 4 of 15

Sierra Instruction Manual ATEX Certified Units: 640S-EEX & 780S-EEX

Zone 1

Area in which an explosive gas atmosphere is
likely to occur in normal operation occasionally

Zone 2

Area in which an explosive gas atmosphere is
not likely to occur in normal operation and if it
does occur, is likely to do so only infrequently
and will exist for a short period only

Zone 21

Place in which an explosive atmosphere in the
form of a cloud of combustible dust in air is
likely to occur in normal operation occasionally

Zone 22

Place in which an explosive atmosphere in the
form of a cloud of combustible dust in air is not
likely to occur in normal operation but, if it does,
will persist for a short period only

Group IIA

Propane

Group IIB

Ethylene

Group IIC

Hydrogen and Acetylene

2. Type Approval Standards

The Sierra Instruments Ex approved flow meters have an EC Type examination certificate
issues by KEMA and have been approved to the following standards:

EN 60079-0 : 2004
EN 60079-1 : 2004

EN 50281-1-1 : 1998 + A1

3. Zone, Gas Group, Category and Temperature class

The Sierra Instruments 640S-EEX and 780S-EEX have been certified ATEX II 2 GD EX d IIC
T6-T2 T280°C (Tamb. -20°C to +50°C). This means that the units can be installed in locations
with the following conditions.

3.1. Area Classification

3.2. Gas Grouping

3.3. Equipment Category

2GD (Zone 2 suitable for Gasses and Dust explosive environments)

Page 5 of 15