MILLENNIUM II
Gas Sensor
Oxygen (O2) Sensor
User Manual
Model: ST340X-25-ASSY
Part Number: MAN-0093 Rev 0
June 2008
IMPORTANT INFORMATION
This manual is for informational purposes only. Although every effort has been made to ensure the correctness
of the information, technical inaccuracies may occur and periodic changes may be made without notice. Net
Safety Monitoring Inc., assumes no responsibility for any error contained within this manual.
If the products or procedures are used for purposes other than as described in the manual, without receiving
prior confirmation of validity or suitability, Net Safety Monitoring Inc. does not guarantee the results and
assumes no obligation or liability. No part of this manual may be copied, disseminated or distributed without the
express consent of Net Safety Monitoring Inc.
Net Safety Monitoring Inc. products are carefully designed and manufactured from high quality components and
can be expressed to provide many years of trouble free service. Each product is thoroughly tested, inspected and
calibrated prior to shipment. Failures can occur which are beyond the control of the manufacturer. Failures can
be minimized by adhering to the operating and maintenance instructions herein. Where the absolute greatest of
reliability is required, redundancy should be designed into the system.
WARRANTY
Net Safety Monitoring Inc warrants this sensor against defective parts and workmanship for a period of 6
months from date of purchase. No other warranties or liability, expressed or implied, will be honoured by Net
Safety Monitoring Inc. Contact Net Safety Monitoring Inc. or an authorized representative for details.
We welcome your input at Net Safety Monitoring Inc. If you have any comments please contact us at the
telephone number or address below or visit our web-site, www.net-safety.com, and complete our on-line
customer survey.
If further language translation for this manual is required please contact:
CONTACT INFORMATION
Net Safety Monitoring Incorporated Direct: (403) 219-0688
Corporate Headquarters Facsimile: (403) 219-0694
2721 Hopewell Place NE E-mail: info@net-safety.com
Calgary, AB Canada T1Y 7J7 Web-site: www.net-safety.com
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TABLE OF CONTENTS
INTRODUCTION .................................................................................................................................................................. 5
THE PRODUCT ................................................................................................................................................................. 5
THE MANUAL .................................................................................................................................................................... 5
Transmitter and Sensor Housing Dimensions ................................................................................................................. 6
SECTION 1: Plan .................................................................................................................................................................. 8
1.1 Locate Sensor ................................................................................................................................................................ 8
1.2 Sensor Non-Separated ................................................................................................................................................... 8
1.3 Sensor Separated ........................................................................................................................................................... 8
SECTION 2: Installation ..................................................................................................................................................... 9
2.1 Unpack ........................................................................................................................................................................... 9
2.2 Mount ............................................................................................................................................................................. 9
2.3 Wiring ............................................................................................................................................................................ 9
2.3.1 Field Installation .................................................................................................................................................... 9
Earth Grounding ................................................................................................................................................................. 9
2.3.2 Sensor Wiring ...................................................................................................................................................... 10
SECTION 3: Operation ...................................................................................................................................................... 10
3.1 Configuration Settings ................................................................................................................................................. 10
3.2 Sensor Power Up ......................................................................................................................................................... 10
3.3 Sensor Communication ................................................................................................................................................ 10
SECTION 4: Output ........................................................................................................................................................... 11
4.1 Alarm and Fault Outputs ............................................................................................................................................. 11
4.1.1 Other Available Outputs ...................................................................................................................................... 11
4.1.2 Modbus registers .................................................................................................................................................. 11
SECTION 5: Maintaining .................................................................................................................................................... 12
5.1 Millennium II Basic Transmitter DIP Switch configurations ...................................................................................... 12
5.1 .1 Alarm Status and Alarm Mode DIP Switch Settings .......................................................................................... 12
5.1 .2 Alarm Points Definition ...................................................................................................................................... 13
5.1.3 Calibrating with the Millennium II Basic Transmitter. ........................................................................................ 14
5.2 Millennium II Transmitter Alarm Configurations ....................................................................................................... 15
5.2.1 Alarm Mode Settings ........................................................................................................................................... 15
5.2 .2 Setting-up Alarm Points (Levels) ....................................................................................................................... 15
5.2.3 Calibrating with the Millennium II Transmitter ................................................................................................... 16
5.3 Sensor Replacement Procedure ................................................................................................................................... 17
5.4 Troubleshoot ................................................................................................................................................................ 18
5.5 Spare Parts / Accessories ............................................................................................................................................ 18
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5.6 How to Return Equipment ........................................................................................................................................... 19
Appendix ............................................................................................................................................................................... 20
Appendix A: Electrostatic Sensitive Device (ESD) ............................................................................................................ 20
Appendix B: Resistance Table ........................................................................................................................................... 21
Appendix C: Millennium II Oxygen (O2) Sensor Specifications ....................................................................................... 22
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INTRODUCTION
The ST340 Oxygen sensor is designed specifically for use with any Millennium II series transmitters. This state
of the art “Smart” sensor is both versatile and reliable for fast, accurate and continuous monitoring of gases in
extreme environments.
THE PRODUCT
The sensor assembly consists of a factory sealed explosion proof housing rated for hazardous locations and a
replaceable sensor module. This sensor is designed to only operate with the Millennium II series Transmitters.
If the sensor is connected to any other model transmitters, it will not function and may result in the sensor being
damaged.
THE MANUAL
This manual has been designed to ensure the sensor / detector is set-up, operated and maintained properly. If you
encounter any problems, see the troubleshooting section of this manual.
Figure 1: Sensor Dimensional Drawing: Measurements are in inches and millimeters (mm)
External Grounding Point
0.75”
4.375” (111mm)
(19 mm)
“
1.25
“
(119mm)
31.75mm)(
“
(66mm)
2.9”
(74mm)
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Transmitter and Sensor Housing Dimensions
The tables below give the dimensions of the Millennium II transmitter housing with sensor and Millennium II
Basic transmitter with sensor. Both transmitter housings and sensors are offered in Aluminium (AL) or
Stainless Steel (SS).
Table 1: Millennium II housing and sensor dimensions (A through H) in Inches(in) and Millimeters(mm)
Millennium II transmitter
housing
Transmitter & sensor(AL) 6.3 160 5.6 142 5.4 137 9.7 246 6.0 152 5.7 145 2.6 66 2.9 74
Transmitter & sensor(SS) 5.9 150 5.1 130 4.6 117 8.9 226 6.0 152 5.8 147 2.6 66 2.9 74
A B C D E F G H
in mm in mm in mm in mm in mm in mm in mm in mm
Table 2: Millennium II Basic housing and sensor dimensions (A through J) in Inches and Millimeters
Millennium II Basic &
sensor
Transmitter & sensor(AL) 4.8 122 3.6 91 3.6 91 4.8 122 5.1 130 0.3 7.6 2.6 66 2.9 74
Transmitter & sensor(SS) 4.7 119 3.6 91 3.6 91 4.7 119 5.1 130 0.3 7.6 2.6 66 2.9 74
A B C D E F G H
in mm in mm in mm in mm in mm in mm in mm in mm
Table 2(cont’d)
Millennium II Basic &
sensor
Transmitter & sensor(AL) 3.0 76 9.0 229
Transmitter & sensor(SS) 2.8 71 8.9 226
I J
in mm in mm
Figure 2 below, shows the dimensions of the Millennium II transmitter with sensor and the Millennium II Basic
transmitter with sensor.
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Figure 2: Sensor with Millennium II series transmitters dimensional drawing
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