Alcatel Vacuum Technology BARATRON 623A User manual

Alcatel Vacuum Technology France
98, avenue de Brogny BP 2069
74009 ANNECY Cedex
Tel : [phone]
Fax : [phone]
Telex : 385 153 F
pt.BTrippt.ATrip Ad jAdj
Zero
TYPE 624
1
8
15
TB2
TB1
r
essure Transducer With Tr ip Points
<RG< <RG<
P
BARATRON®
TYPES 623A/624A/625A
ABSOLUTE PRESSURE TRANSDUCERS
Date : 09.1998
EDITION 02
Instruction manual P/N 105460

ii 105460 - Ed 02
For more information or literature, contact:
Alcatel Vacuum Technology France
98 av. de Brogny
74009 ANNECY Cedex France
Phone: [phone]
FAX: [phone]
Copyright © 1996 by MKS, Inc. for Alcatel High Vacuum Technology
All rights reserved. No part of this work may be reproduced or transmitted in any form or by any
means, electronic or mechanical, including photocopying and recording, or by any information
storage or retrieval system, except as may be expressly permitted in writing by Alcatel.
Swagelok®, VCR®, and VCO®are registered trademarks of Swagelok Marketing Co., Solon, OH
Baratron®is a registered trademark of MKS Instruments, Inc., Andover, MA
Inconel® is a registered trademark of Inco Alloys International, Huntington, WV

Table of Contents
105460 - Ed 02 iii
Table of Contents
■Safety Procedures and Precautions.............................................................1
■Chapter One: General Information...........................................................3
■Introduction................................................................................................................. 3
■How This Manual is Organized .................................................................................... 4
■Customer Support ....................................................................................................... 4
■Chapter Two: Installation .........................................................................5
■How To Unpack The Transducer .................................................................................. 5
•Unpacking Checklist ................................................................................................ 5
■Alcatel Companion Products ........................................................................................ 6
■Fittings........................................................................................................................8
■Setup .......................................................................................................................... 9
•Dimensions ........................................................................................................... 10
•Electrical Installation .............................................................................................. 10
•Interface Cables .................................................................................................... 12
•Checking the Transducer Zero................................................................................ 13
■Chapter Three: Overview .......................................................................15
■General .................................................................................................................... 15
■Sensor ...................................................................................................................... 15
■Signal Conditioner/Electronics.................................................................................... 16
■The Endcap............................................................................................................... 16
■Chapter Four: Operation .......................................................................17
■General .................................................................................................................... 17
•Lowest Suggested Pressure Available for Reading .................................................... 17
•Lowest Suggested Pressure to Use for Control ......................................................... 17
■How To Set the Trip Points ......................................................................................... 19
■How To Adjust the Trip Point Direction ........................................................................ 21
■How To Adjust the Trip Point Hysteresis....................................................................... 25
■Chapter Five: Maintenance and Troubleshooting .....................................29
■General .................................................................................................................... 29
■Zero Adjustment........................................................................................................ 29
■Troubleshooting Chart............................................................................................... 31
■Appendix A: Product Specifications .........................................................33
■ALCATEL Type 623A.................................................................................................. 33
■ALCATEL Type 624A.................................................................................................. 34
■ALCATEL Type 625A.................................................................................................. 35
■Appendix B: CE Declaration of Conformity ...............................................37

List of Figures List of Tables
iv 105460 - Ed 02
List of Figures
Figure 1: Two Types of Installation .................................................................................6
Figure 2: Metal Single and Double Ferrule Compression-type Vacuum Fittings..................9
Figure 3: Baratron ® Capacitive Transducer’s Position ....................................................9
Figure 4: Dimensions of the Types 623A, 624A, and 625A Transducers .........................10
Figure 5: Power, Signal, and Chassis Grounding Scheme ..............................................11
Figure 6: The Endcap ..................................................................................................16
Figure 7: Analog Output versus Pressure ......................................................................18
Figure 8: How To Measure the Trip Point Voltage ..........................................................19
Figure 9: Placement of the Trip Point Adjustment Screws ................................................20
Figure 10: The Relay Board..........................................................................................22
Figure 11: The Alternate Relay Board............................................................................23
Figure 12: How Hysteresis Effects Accuracy and Relay Chatter........................................27
Figure 13: Location of the Zero Pot...............................................................................30
List of Tables
Table 1: Baratron® and Power supply Readouts compatibility ...........................................7
Table 2: Cable References ...........................................................................................10
Table 3: Required Inputs for the Types 623A, 624A, and 625A Transducers ...................11
Table 4: Terminal Block 1 (TB1) Pinout .........................................................................12
Table 5: Terminal Block 2 (TB2) Pinout .........................................................................13
Table 6: Suggested Pressures for Reading and Control ..................................................17
Table 7: Factory-Set Positions of the Shorting Jumpers...................................................24
Table 8: Shorting Jumper Positions for Hysteresis ..........................................................25
Table 9: Highest Pressure Suggested for Proper Zero Adjustment ...................................30
Table 10: Troubleshooting Chart..................................................................................31

Safety Procedures and Precautions
105460 - Ed 02 1
Safety Procedures and Precautions
ALLOW THE UNIT TO WARM UP
If the unit is used to control hazardous gases, they should not be applied before the unit
has completely warmed up.
USE THE PROPER SIGNAL/POWER CABLE
Use only the cable specified for your product. Use only a cable in good condition.
DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT
Do not install substitute parts or perform any unauthorized modification to the instrument.
Return the instrument to an Alcatel Calibration and Service Center for service and repair to
ensure that all safety features are maintained.
SERVICE BY QUALIFIED PERSONNEL ONLY
Operating personnel must not remove instrument covers. Component replacement and
internal adjustments must be made by qualified service personnel only.
PURGE THE INSTRUMENT
After installing the unit, or before its removal from a system, be sure to purge the unit
completely with a clean dry gas to eliminate all traces of the previously used vapors.
DO NOT OPERATE IN EXPLOSIVE AMBIENT ATMOSPHERES
To avoid explosion, do not operate this product in an explosive atmosphere unless it has
been specifically certified for such operation.
USE PROPER FITTINGS AND TIGHTENING PROCEDURES
All instrument fittings must be consistent with instrument specifications, and compatible with
the intended use of the instrument. Assemble and tighten fittings according to
manufacturer’s directions.
CHECK FOR LEAK-TIGHT FITTINGS
Before proceeding to instrument set up, carefully check all plumbing connections to the
instrument to ensure leak-tight installation.
KEEP THE UNIT FREE OF CONTAMINANTS
Do not allow contaminants of any kind to enter the unit before or during use.
Contamination such as dust, dirt, lint, glass chips, and metal chips may permanently
damage the unit and nullify the warranty.
OPERATE AT PROPER PRESSURE
This transducer is designed for use in vacuum applications. It should not be used in
applications where the system may be exposed to greater than 45 psia or 120% of F.S.
(whichever is greater).
If an Ultra-Torr fitting is used, the system pressure should not exceed 1200 Torr absolute
pressure.

Safety Procedures and Precautions
2 105460 - Ed 02
Definitions of WARNING, CAUTION, and NOTE messages used throughout the manual.
Warning
The WARNING sign denotes a hazard. It calls attention to
a procedure, practice, condition, or the like, which, if not
correctly performed or adhered to, could result in injury to
personnel.
Caution
The CAUTION sign denotes a hazard. It calls attention to
an operating procedure, practice, or the like, which, if not
correctly performed or adhered to, could result in damage
to or destruction of all or part of the product.
Note
The NOTE sign denotes important information. It calls attention to a
procedure, practice, condition, or the like, which is essential to
highlight.

Chapter One: General Information Introduction
105460 - Ed 02 3
Chapter One: General Information
Introduction
The Baratron ® Type 623A 624A, and 625A Absolute Pressure Transducers are part of an
Alcatel family of general purpose pressure transducers designed to provide accurate,
reliable, and repeatable pressure measurements in the range from 1000 Torr down to 10
Torr full scale (F.S.). These instruments operate with ±15 VDC (±5%) input @ 75 mA,
400 mA, or 600 mA, depending upon the unit, and provide 0 to 10 VDC output linear with
pressure. All instruments expose only Inconel® to the process permitting use with corrosive
or dirty gases and eliminating contamination of the process with transducer materials.
Measurements are independent of gas composition and all of the units have a minimum
measuring range of four decades.
Using the latest single-sided, dual-electrode Inconel® transducer design, coupled with a
low impedance, fixed-frequency bridge signal conditioner, these instruments are capable of
withstanding high overpressure conditions (45 psia) with minimal or no shifts in output over
their range. The advanced bridge signal conditioning technology provides high accuracy
and is extremely stable during operation.
Protection from RF interference and noisy electrical environments is increased by the use of
a metal case, by internal design elements, and by the use of surge and ESD suppression
networks and RFI filtering on all inputs and outputs.
The Types 623A and 625A transducers have an accuracy of 0.25% of reading (optional
0.15% of reading with Type 623A), and the 624A unit has an accuracy of 0.12% of
reading. These instruments have been developed for applications requiring a small,
economical transducer which delivers accurate and repeatable measurements with a
resolution of 1 x 10
-4
F.S.
These transducers are designed specifically to meet the needs of vacuum process systems
where environmental and process conditions are particularly demanding. Temperature
control of the transducer minimizes the effects of ambient or process temperature variations
typically encountered in process line environments. The Type 623A is a general purpose
unheated unit, while the Type 624A controls the transducer temperature at 45° C, and the
Type 625A controls at 100° C, thereby minimizing contamination from the process and
affording better performance with ambient temperature variations.
All three transducers feature two trip point relays, each separately adjustable from 0.1 to
100% of Full Scale. The dimensions of the instruments are identical, and each transducer
has both a 5-pin (TB1) and 8-pin (TB2) terminal block on its cover.

How This Manual is Organized Chapter One: General Information
4 105460 - Ed 02
How This Manual is Organized
This manual is designed to provide instructions on how to set up and install a Type 623A,
624A, or 625A unit.
Before installing your Type 623A, 624A, or 625A unit in a system and/or
operating it, carefully read and familiarize yourself with all precautionary
notes in the
Safety Procedures and Precautions section at the front of this
manual. In addition, observe and obey all
WARNING and CAUTION notes
provided throughout the manual.
Chapter One: General Information, (this chapter) introduces the product and describes the
organization of the manual.
Chapter Two: Installation, explains the environmental requirements and describes how to
mount the instrument in your system.
Chapter Three: Overview, gives a brief description of the instrument and its functionality.
Chapter Four: Operation, describes how to use the instrument and explains all the
functions and features.
Chapter Five: Maintenance and Troubleshooting, describes maintenance and
troubleshooting procedures.
Appendix A: Product Specifications, lists the specifications of the instrument.
Appendix B : Declaration of conformity
Customer Support
Should any difficulties arise in the use of your Type 623A, 624A, and 625A instrument, or
to obtain information about companion products ALCATEL offers, contact any authorized
Alcatel Service Center. If it is necessary to return the instrument to ALCATEL, please contact
an Alcatel Service Center before shipping.
Please refer to the end of this manual for a list of Alcatel Service Centers.
Warning
All returns to Alcatel must be free of harmful, corrosive,
radioactive, or toxic materials.

Chapter Two: Installation How To Unpack The Transducer
105460 - Ed 02 5
Chapter Two: Installation
How To Unpack The Transducer
Alcatel has carefully packed the Absolute Pressure Transducer (Type 623A, 624A, and
625A) so that it will reach you in perfect operating order. Upon receiving the unit, however,
you should check for defects, cracks, broken connectors, etc., to be certain that damage
has not occurred during shipment.
Note
Do not discard any packing materials until you have completed your
inspection and are sure the unit arrived safely.
If you find any damage, notify your carrier and Alcatel immediately. If it is necessary to
return the unit to Alcatel, call the Alcatel Service Center before shipping. Please refer to the
end of this manual for a list of Alcatel Service Centers.
Unpacking Checklist
Standard Equipment
•The Type 623A, 624A, or 625A Absolute Pressure Transducer (specified at time of order)
•Two mating connectors - one for the 5-pin terminal block and one for the 8-pin terminal
block
•The Type 623A, 624A, and 625A Instruction Manual (this book)

Alcatel Companion Products Chapter Two: Installation
6 105460 - Ed 02
Alcatel Companion Products
The Baratron 623A - 624A - 625A can be installed & operated the following
ways :
POWER SUPPLY
A
ND DIGITAL
READOUT
(
PDR
)
BARATRON
CAPACITIVE
TRANSDUCER
VACUUM
FITTING
See
p
ara
g
ra
p
h:
"Electrical Installation"
p
a
g
e 11
See
p
ara
g
ra
p
h:
"Setu
p
"
p
a
g
e 9
See
p
ara
g
ra
p
h:
"Fittin
g
s"
p
a
g
e 8
VACUUM
CHAMBER
INSTALLATION WITH A POWER
DISPLAY AND READOUT
(
PDR
)
POWER SUPPLY
VACUUM
CHAMBER
SIGNAL
OUTPUT
CUSTOMER SPECIFIC
INSTALLATION
Figure 1: Two Types of Installation
The Type 623A, 624A, and 625A are compatible with:
•PDR-C-1C, PDR-C-2C, PDR 660B, PR 4000 readouts
Appropriate cables,see ‘Table 2: Cable References’ on page 10.