Net Safety Monitoring ST321X-100-ASSY Operating Manual
MILLENNIUM II
Toxic Gas Sensor
H2S Solid State Sensor
User Manual
Model: ST321X-100-ASSY
Part Number: MAN-0090 Rev 4
August 27, 2010
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 expected 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 2 years
from the date of shipment. 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/
customer survey.
If further language translation for this manual is required please contact:
, and complete our on-line
CONTACT INFORMATION
Net Safety Monitoring Incorporated Direct: (403) 219-0688
Corporate Headquarters Facsimile: (403) 219-0694
2721 Hopewell Place NE E-mail: nsmsales@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 Enclosure Dimensions .............................................................................................................. 6
SECTION 1: Plan ................................................................................................................................................................... 7
1.1 Locate Sensor ................................................................................................................................................................ 7
1.2 Sensor Non-Separated/direct mounting ......................................................................................................................... 7
1.3 Sensor Separated/remote mounting ............................................................................................................................... 7
SECTION 2: Installation ....................................................................................................................................................... 8
2.1 Unpack ........................................................................................................................................................................... 8
2.2 Mount ............................................................................................................................................................................. 8
2.3 Wiring ............................................................................................................................................................................ 8
2.3.1 Field Installation .................................................................................................................................................... 8
Earth Grounding ................................................................................................................................................................. 8
2.3.2 Sensor Wiring ........................................................................................................................................................ 9
2.3.3 Installation Checklist ............................................................................................................................................. 9
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 Calibration Procedure ................................................................................................................................................. 12
5.1.1 Calibrating with the Millennium II Basic Transmitter. ........................................................................................ 12
5.1.2 Calibrating with the Millennium II Transmitter. .................................................................................................. 15
5.1.3 Cross sensitivity ................................................................................................................................................... 18
5.2 Sensor Replacement Procedure ................................................................................................................................... 18
5.3 Troubleshooting ........................................................................................................................................................... 19
5.4 Storage ......................................................................................................................................................................... 19
5.5 Spare Parts / Accessories ............................................................................................................................................ 19
5.6 How to Return Equipment ........................................................................................................................................... 20
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Appendix ............................................................................................................................................................................... 21
Appendix A: Electrostatic Sensitive Device (ESD) ............................................................................................................ 21
Appendix B: Resistance Table ........................................................................................................................................... 22
Appendix C: Millennium II Toxic Solid State H2S Sensor Specifications ......................................................................... 23
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INTRODUCTION
H2S (ST321) Toxic Solid State gas sensors are designed specifically for use with the Millennium II series
transmitters. These state of the art “Smart” sensors are 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 enclosure (housing) rated for hazardous
locations and a replaceable toxic sensor module. This sensor should only be used with the Millennium II series
transmitters (Millennium II Basic Transmitter and the Millennium II Transmitter). If the sensor is
connected to any other model transmitter, it will not function and may result in the sensor being damaged.
THE MANUAL
This manual has been designed to ensure the sensor is set-up, operated and maintained properly. It outlines
specific details of the Solid State H2S sensor and addresses calibration procedures using the Millennium
II Basic Transmitter and the Millennium II Transmitter. If you encounter any problems, see the
troubleshooting section of this manual or contact your local representative.
Figure 1: Sensor Dimensional Drawing
Measurements are in inches and millimeters (mm).
(19 mm)
0.75”
External Grounding Point
“
31.75mm)(
1.25
4.375” (111mm)
“
(119mm)
“
(66mm)
2.9”
(74mm)
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Transmitter and Sensor Enclosure Dimensions
The tables below give the enclosure (housing) dimensions of the Millennium II Transmitter with sensor and
Millennium II Basic Transmitter with sensor. Both transmitter and sensor enclosures are offered in Aluminum
(AL) and Stainless Steel (SS).
Table 1: Millennium II enclosure and sensor dimensions (A through H) in Inches(in) and Millimeters(mm)
Millennium II transmitter
enclosure
A B C D E F G H
in mm in mm in mm in mm in mm in mm in mm in mm
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
Table 2: Millennium II Basic enclosure (or junction box enclosure) and sensor dimensions (A through H) in
Inches(in) and Millimeters(mm)
Millennium II Basic &
sensor
A B C D E F G H
in mm in mm in mm in mm in mm in mm in mm in mm
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
Table 2(cont’d)
Millennium II Basic &
sensor
I J
in mm in mm
Transmitter & sensor(AL) 3.0 76 9.0 229
Transmitter & sensor(SS) 2.8 71 8.9 226
Figure 2: Dimensional drawing for sensor with Millennium II series transmitters
Millennium II Transmitter with sensor
Millennium II Basic Transmitter with sensor
A
B
E
F
A
B
I
C
R 0.157”
(3.98mm)
4.1” (AL)
(103.0mm)
3.8” (SS)
(97.0mm)
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D
G
H
CD
E
F
G
H
J
SECTION 1: Plan
1.1 Locate Sensor
Prior to the installation process, a plan should be developed for placement of the sensor. Although there are no
absolute rules determining the quantity of detectors or location of a sensor, the following points should be
considered when planning the installation.
• Carefully locate the sensor in an area where gases may potentially accumulate. (Remember, light gases
tend to rise and heavy gases tend to accumulate in low areas).
• Use redundant systems to enhance protection and reliability.
• Consider the air movement patterns within the facility.
• Consider the construction of the facility such as trenches where heavy gases or peaks where light gases
may accumulate.
• Seek advice from experts knowledgeable about the primary gas to be detected.
• Use common sense and refer to the regulatory publications that discuss guidelines for your industry.
1.2 Sensor Non-Separated/direct mounting
The sensor is attached directly to a transmitter and placed in the appropriate location for detecting the gas in
question (target gas).
Figure 3: Locating Sensor
1.3 Sensor Separated/remote mounting
The sensor should always be connected to a certified
junction box when separated from transmitter. The
transmitter is located near eye-level for easy access and the
sensor is mounted where the gas is likely to accumulate. A
calibration cup is clipped onto the bottom of the sensor
enclosure and the calibration tubing is attached to the
calibration cup and runs to a convenient place for applying
calibration gas, eliminating the need to access the sensor
directly. Calibration gas can then be applied from ground
level.
To compensate for the effect of distance when remotely
calibrating, in separation configuration, decrease the
tubing diameter or increase the calibration gas flow rate
between the gas canister and sensor. On initial install,
always confirm tubing run is not affecting calibration.
Calibrate the sensor using tubing run and then confirm
readings directly at sensor by applying calibration gas and
comparing the output results. Readings should be accurate
to the calibration gas concentration used.
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SECTION 2: Installation
2.1 Unpack
Carefully remove all the components from the packaging and check them against the enclosed packing list.
Inspect all components for any obvious damage such as broken or loose parts. If you find any components
missing or damaged, notify your local Net Safety representative or the factory immediately.
2.2 Mount
Warning
Recommendation: The sensor should be installed pointing downwards.
The sensor is mounted directly to either transmitter enclosure or to a separation junction box enclosure through a
¾” NPT conduit entry. Both the transmitter and junction box enclosures have mounting holes to allow mounting
to a wall or pole as desired. Mounting kit hardware is required when mounting to a pole. Contact your local Net
Safety Representative for detailed information on mounting kits.
Never install the sensor pointing upwards.
2.3 Wiring
2.3.1 Field Installation
Warning Wiring codes and regulations may vary. ATEX requires that supply connection wiring must be
rated at least 5°C above the maximum ambient temperature of 85°C. Wiring must comply with all applicable
regulations relating to the installation of electrical equipment in a hazardous area and is the responsibility of the
installer. If in doubt, consult a qualified official before wiring the system.
Guidelines
When separating sensor from transmitter, the use of shielded cable is highly recommended for sensor wiring to
protect against interference caused by extraneous electrical or electromagnetic ‘noise’. To meet IEC 61000-1,
IEC 61000-4 EMI, follow recommendations on cable choice and guidelines in the specific Millennium II series
transmitter manual (MAN-0082 or MAN-0076). In applications where the wiring is installed in conduit, the
conduit must not be used for wiring to other electrical equipment.
The maximum distance between the sensor and transmitter is limited by the resistance of the connecting wiring,
which is a function of the gauge of the wire being used. Net Safety recommends that sensor separation distance
should not be more than 2000 ft with 16 AWG wire. See Appendix B for wire gauges and resistance values.
Earth Grounding
An external ground is required. One method is to connect the external ground to the grounding point on the
enclosure. See Figure 1 for grounding connection location.
Conduit Entry
Sensors are mounted directly to transmitters via ¾” NPT conduit entries through which wires are connected to
terminals. Sensors may also be mounted remotely to transmitters using certified junction boxes with designated
terminals. Transmitter and junction box enclosures are shipped with one stopping plug fitted and tightened to a
¾” NPT conduit entry.
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