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MILLENNIUM II
Toxic Gas Sensor
H2S Solid State Sensor
User Manual
Model: ST321X-100-ASSY
Part Number: MAN-0090 Rev 4
August 27, 2010
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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
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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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2.3.2 Sensor Wiring
Warning
Do not open enclosures in a classified area (Do not open when an explosive atmosphere may
be present). Ensure the power to the transmitter is switched off before connecting sensor wires.
Warning
(ESD). Refer to Appendix A, “Electrostatic Sensitive Device (ESD)”.
Connect sensor wires to the sensor terminals in the applicable transmitter. Refer to the Table 3: Sensor wires and
Millennium II series Terminal definitions for sensor terminal definitions.
Table 3: Sensor wires and Millennium II series Terminal definitions
NOTE: When separating sensor from transmitter using Net Safety separation kit, refer to Multi-purpose
Junction Box Manual (MAN-0081) for terminal designations. Always ensure that the transmitter is supplying
the required voltage across sensor power terminals inside junction box. Refer to table above for sensor voltage
requirements.
Avoid touching electronic components, as they are susceptible to electrostatic discharge
White Red Blue Black Green
+Vdc SigA SigB COM
10.5‐32Vdc A B
Common/Supply
ground
SensorTerminals
SensorWire
Marked
Function
EarthGround
2.3.3 Installation Checklist
Prior to operation, it is important to do the following:
• Ensure transmitter and sensor are properly and firmly mounted.
• Ensure that stopping plug is tightened to unused conduit entry.
• Ensure transmitter and sensor are not being obstructed; transmitter and sensor are accessible and target
gas is not inhibited from reaching sensor.
• Remove sensor red protective plastic cap/cover from sensor mouth.
• If IP filters are being used/fitted to sensor, check for damage or debris. Refer to specific IP filter
instruction guide (MAN-0109).
• If calibration cups (splash guards) are used/fitted to sensor, ensure a snug fit.
• Ensure adherence to applicable local guidelines and requirements on wiring and sealing of equipment in
hazardous and non-hazardous areas.
• Ensure that proper shielding and grounding practices are adhered to, and local codes are being followed.
• Check system operational voltage and conditions. See Table 3: Sensor wires and Millennium II series
Terminal definitions and Appendix C.
• Check wiring at all termination and junction points; wiring at transmitter terminals, junction box and at
power supply. See Table 3 above and specific transmitter manual.
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SECTION 3: Operation
3.1 Configuration Settings
All configuration settings are accessed through the Millennium II series transmitters. When using the
Millennium II Basic Transmitter, configuration settings are made by DIP switches or accessing Modbus
registers depending on the model Millennium II Basic Transmitter. For the Millennium II Transmitter, settings
are accessed by selecting menu options. ST321 sensors have selectable ranges of 20, 50 and 100 PPM. The
default range/upper limit is 100 PPM. Refer to Section ‘5.1.1: Calibrating with the Millennium II Basic
Transmitter’ and Section ‘5.1.2: Calibrating with the Millennium II Transmitter’ for information on changing
the range/upper limit.
Warning Whenever the sensor’s range is changed, a calibration must be performed.
3.2 Sensor Power Up
When power is applied to sensors by transmitters, a warm-up routine will begin, whereby sensors are
automatically tested to ensure proper functioning. The warm-up time for Solid State sensors is typically 12 to 15
minutes. Refer to the Millennium II Basic Transmitter manual (MAN-0082) or the Millennium II Transmitter
manual (MAN-0076) for status indications during this period. These sensors should be powered up for at
least 48 hours prior to the first calibration. Prior to commissioning and during routine calibrations,
sensors should be calibrated at the average operating temperature.
3.3 Sensor Communication
ST321 sensors use a proprietary protocol to communicate with the Millennium II series transmitters. These
sensors should never be connected to any device other than the Millennium II series transmitters. Selected DIP
switches and menu options allow communication between transmitters and sensors. Configuration settings are
stored in the sensors’ memory. Incorrect settings will cause sensors not to communicate properly with
transmitters. If any problems develop see troubleshooting section.
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SECTION 4: Output
4.1 Alarm and Fault Outputs
Sensor alarm and fault outputs are generated by Millennium II series transmitters based on communication with
sensors, however some output values, registers, etc, may vary depending on sensor type. The default alarm
levels (points) for the sensor are: 10 ppm for the low level and 20 ppm for the high level.
4.1.1 Other Available Outputs
All available outputs are associated with the Millennium II series transmitters. These outputs are: 4-20 mA
output, Relay output, RS 485 Modbus (RTU) output and HART Communication output. Refer to the
Millennium II Basic Transmitter manual (MAN-0082) or the Millennium II Transmitter manual (MAN-0076)
for more information.
4.1.2 Modbus registers
Table 4 below shows the user accessible Modbus registers and meaning.
Table 4: Modbus registers and meaning
Reg# Meaning Readable Writeable
40001 Concentration value as calculated by sensor X
40002 Sensor status X
40003 Sensor Temperature X
40027 Sensor Range X X
40101 Resets the sensor X
40102 Initialize zero & span *( to calibrate sensor, enter channel #)* X
40104 Zero only *( to zero sensor, enter channel #)* X
* Note: For the Millennium Basic transmitter enter ‘1’ in register 40102 to calibrate the sensor and ‘1’ in
register 40104 to Zero the sensor.
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SECTION 5: Maintaining
5.1 Calibration Procedure
Always allow ST321 sensors to warm up for at least 48 hours prior to the first calibration. These sensors
should be calibrated at the average operating temperature.
There are specific steps to be followed when calibrating with the Millennium II Basic and the Millennium II
Transmitters. These steps should be followed if accurate results are to be obtained. The calibration of Solid State
sensors requires the presence of oxygen, as a result, an air balanced calibration gas should be used for
calibration, otherwise these sensors will not calibrate properly. It is recommended that these sensors be
calibrated every 3 months (90 days) to ensure proper functioning. Calibrations should also be performed at the
average operating temperature.
5.1.1 Calibrating with the Millennium II Basic Transmitter.
When using Solid State H2S sensors with the Millennium II Basic Digital Transmitter Models, sensors’
ranges can be changed by accessing a specific Modbus register. The user should write to register 40027 using
the preset single register command 0x06. The desired range can then be entered in the register. The ranges
available for entry to the Modbus Register are 20, 50 and 100.
When using Solid State H2S sensors with Millennium II Basic Analog, Analog HART and Relay
Transmitter models, sensors’ ranges can be changed to facilitate the need to accurately detect different gas
concentrations. This is done by making use of the transmitter’s DIP Switch 2 positions as seen in Table 5 below.
First select the transmitter’s DIP Switch 2 position that gives the range of H2S gas to be detected, then use
recommended air balanced 50% span H2S gas to calibrate. See example, Table 5 and Full Calibration /
Normal Calibration Procedure below. If calibration is not successful perform a manual reset. See Millennium II
Basic Manual (MAN-0082) for manual reset.
Example: If H2S gas up to 20 ppm is to be detected, and an ST321 sensor has a range of 100ppm, DIP Switch 2
position 1 should be “ON” and positions, 2, 3, 4 “OFF” which corresponds to Range 1 (20ppm), as seen in Table
5 below. The sensor is then calibrated using 10 ppm air balanced H2S gas.
Table 5: Millennium II Basic Transmitter DIP Switch 2 positions/combinations
DIPSwitch2
Position1 Position2 Position3 Position4 Range(Setting)
OFF OFF OFF OFF
ON OFF OFF OFF
OFF ON OFF OFF
OFF OFF ON OFF
OFF OFF OFF ON
ON ON ON ON
default(factory)setting
Range1(20ppm)
Range2(50ppm)
Range3(100ppm)
Range4(Notused)
Range5(Notused)
If the sensor’s range is setup correctly as desired, refer to Millennium II Basic Transmitter calibration
procedure below and /or Figure 4 before attempting calibration.
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Millennium II Basic Transmitter Normal Calibration Procedure:
Calibrations may be performed either by using the magnet (non – intrusive) or by using the push button
(intrusive).
1. Confirm successful power up of transmitter, (green blip/blink of status LED every second: no fault
indicated).
2. Bypass any output alarms (recommended).
3. For analog model connect a standard current meter to the transmitter’s Test Jacks (not required but gives
visual confirmation).
4. Press and hold the “push button” (or activate the “Reed switch” using the magnet) for at least 15
seconds, the status LED flashes green fast, and then goes solid green (first solid green). Keep holding
“push button” or magnet, after which, status LED goes solid red. When this occurs, release “push
button” or remove magnet.
5. When the current output is 3 mA (indicated by analog models) and the Status LED is once again solid
green (second solid green), apply zero gas (clean air). Recommendation: Flow ZERO AIR at a rate of
0.5 liter per minute or more to the sensor.
6. When the current output is 3.3 mA (indicated by analog models) and the Status LED is flashing red,
apply specific calibration gas (50% of full span). Recommendation: Flow span gas at a rate of 0.5 liter
per minute to the sensor for direct sensor calibrations. If sensor is remotely mounted and long tubing run
is used, increase gas flow rate (e.g. 1.0 liter per minute) to ensure tubing length does not affect
calibration results.
7. When the current output is 3.6 mA (indicated by analog models) and the Status LED is solid green,
remove the gas.
8. Apply zero gas (clean air) again to purge the system.
9. After the sensor is purged of gas, the detector will return to normal operation.
Note: When calibrating with the Millennium II Basic Transmitter always use 50% span gas (half the scale).
Calibration gas MUST be air balanced for ST321 sensors. Calibration instructions are also accessed using
the HART Communicator with the Analog/HART model transmitter. For HART Menu Structure/Tree, see
Millennium II Basic transmitter manual (MAN-0082).
Zero Calibration Option:
This option is useful if the sensor’s zero point has drifted as a result of a change in the ambient conditions.
The “Zero” calibration option is selected if sensors are only being zeroed (this not a complete calibration)
It does not require the application of span gas, as only the sensor’s zero point is adjusted. Ensure that no
contaminants are present, if the surrounding air is to be used for Zeroing. If Zero calibration is needed, at step 4
above, hold the push button or activate Reed switch (for 6-9 seconds) using the magnet, until the status LED
goes solid green, and then release the switch. Zero calibration will begin immediately.
See Figure 4: Calibration Flow chart for Millennium II Basic Transmitter on next page for additional
reference.
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y
p
p
•
Figure 4: Calibration flow chart for Millennium II Basic Transmitter
Calibration Procedure
ZERO Calibration FULL Calibration
Activate/Hold *calibration
switch* for 6 -9 seconds.
Status LED: Flashes fast
Green
Activate/Hold *calibration switch* for 10-15
seconds. Keep holding through first solid
Green until status LED is Solid Red.
Status LED: Solid Red
Release push button
/magnet
Status LED: Solid Green
Release push button
/magnet
Status LED: Solid Green
Current output: 3.0 mA
indicated by Analog
models
Apply air from canister or use
clean ambient air to
erform ‘zero’
NO
Calibration Failed. Status LED:
Alternating Red/Green flashes.
Current output: 3.0/3.3 mA indicated by Analog
models.
Perform manual reset. Refer to “manual reset” in MII
Basic transmitter manual (man-0082).
Repeat calibration procedure.
Apply air from canister or use
clean ambient air to
Status LED: Flashing Red
Current output: 3.3 mA
indicated by Analog models
Apply 50% span target gas to perform ‘span’
Calibration successful?
Current output: 3.6 mA
indicated b
Analog models
erform ‘zero’
YES
Remove gas and purge system with clean air from canister
upon completion of Full calibration, then remove air
canister.
• Remove air canister after Zero calibration procedure if an
air canister was used.
Note: * See the Millennium II Basic transmitter manual (MAN-0082) when locating calibration
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5.1.2 Calibrating with the Millennium II Transmitter.
The need to accurately detect different concentrations of gases is facilitated by using the Millennium II
Transmitter. If the range of the ST321 sensor needs to be changed, enter the ‘sensor upper limit’ option in the
transmitter’s menu and select the desired range of concentration of gas to be detected. Refer to the steps b elow
for changing the sensor’s range.
1. Enter the Main menu, first by pressing any key to get the “enter main menu” prompt, then press menu
button 1 (Reed switch 1) to select “yes.”
2. Select the up arrow key menu button 1 (Reed switch 1) or down arrow key menu button 2 (Reed switch
2), until “Sensor Upper Limit (Range)”option is displayed.
3. Select the enter key (press Menu button 3 or select Reed switch 3).
4. Select the Channel (sensor) to be configured. If channel 1’s sensor range is to be adjusted, select the
enter key (Menu button 3 or Reed switch 3) or,
5. If channel 2 sensor’s range is to be adjusted, use the down arrow key (Menu button 2 or Reed switch 2)
and then select it with the enter key (Menu button 3 or Reed switch 3).
6. Use the up-down arrow keys (Menu button 1 and 2 or Reed switch 1and 2) to find the desired upper
limit (the sensor will provide the ranges).
7. Select the enter key (Menu button 3 or Reed switch 3) when the desired value is reached.
8. To exit to the main menu, select “Exit”
selection.
Refer to Millennium II Transmitter calibration procedure below and/or Figure 5 before attempting
calibration.
Millennium II Transmitter Normal (Full) Calibration Procedure:
If the sensor’s upper limit (Range) is setup correctly as desired, follow the steps below for Full Calibration /
Normal Calibration Procedure. Always use 50% span (half the scale) air balanced H2S gas when calibrating
this sensor. Note that if a calibration is not successful the message “Span failed” will be displayed and a
manual reset will have to be initiated. Refer to Millennium II Transmitter manual (MAN-0076) for manual reset.
1. Enter the main menu, first by pressing any key to get the “enter main menu” prompt, then press/select
menu button 1 or Reed switch 1 to select “yes.”
2. When “Calibrate Sensor?” is displayed, select the enter key (menu button 3 or Reed switch 3).
3. When “Calibrate Sensor #1?” is highlighted, press the enter key (menu button 3 or Reed switch 3) if
this is the sensor to be calibrated or,
4. If Sensor #2 is to be calibrated, select the down arrow key (menu button 2 or Reed switch 2) to scroll to
“Calibrate Sensor #2?”
at each previous option and use the enter key to confirm the
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5. When the desired sensor to be calibrated is highlighted, activate the enter key (menu button 3 or Reed
switch 3).
6. Select “YES” (menu button 1 or Reed Switch 1) to confirm the selection.
7. Apply clean air when “Apply Clean Air” is displayed, then select “Z & Span” using (menu button 1 or
Reed Switch 1) for normal calibration. “Setting zero” will be displayed as the sensor is being zeroed.
(Ensure no contaminant gases are present if ambient air is being used).
8. Apply 50% calibration gas when prompted. Recommendation: Flow span gas at a rate of 0.5 liter per
minute to the sensor for direct calibrations. If sensor is remotely mounted and long tubing run is used,
increase gas flow rate (e.g. 1.0 liter per minute) to ensure tubing length does not affect calibration
results.
9. The display will show “Spanning” with the gas value (PPM ) as the gas is detected.
10. Remove the calibration gas when “Remove Cal Gas” is displayed.
11. “Cal Complete” will be displayed when calibration is complete.
12. Apply zero gas (clean air) to purge sy stem.
Note: Calibration gas MUST be air balanced. Calibration instructions are also accessed using the HART
Communicator with the single channel Millennium II Transmitter model.
Zero Calibration Option:
This option is useful if the sensor’s zero point has drifted as a result of a change in the ambient conditions.
The “Zero” calibration option is selected if the sensor is only being zeroed (this not a complete calibration).
The application of span gas is not required, as only the sensor’s zero point is adjusted. Ensure that no
contaminants are present, if the surrounding air is to be used for Zeroing. If Zero calibration is needed, at step 7
above, select ‘Zero’ using (menu button 3 or Reed Switch 3) and use clean ambient air or air form canister to
calibrate.
See Figure 5: Calibration Flow chart for Millennium II Transmitter on next page for additional
reference. The chart shows calibration steps for channel 1. Calibration steps for channel 2 are similar.
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Figure 5: Calibration Flow chart for Millennium II Transmitter
r
r
r
•
N
N
Calibration Procedure
Purge system with clean
air from canister, then
remove air canister
Calibration complete
Activate any menu button
Enter Main Menu
YES NO
Activate menu button 1
Calibrate Sensor?
Span Failed.
Perform
manual reset.
See MII
transmitter
manual
(MAN-0076).
Repeat
calibration
procedure.
O
Remove Calibration Gas
Span successful?
CH1: Spanning
PPM reading
Activate menu
button 3 to select
Apply 50% Span gas
YES
Calibrate Senso
Calibrate Senso
#1?
#2?
Activate menu button
3 to select
Zero Failed.
Perform
manual reset.
See MII
transmitter
manual
(MAN-0076).
Repeat
calibration
procedure.
Remove air canister if air canister was used
in Zero calibration. Zero calibration
complete.
• Remove air canister in Full calibration
procedure and continue to span step
YES
O
Zero successful?
Calibrate Senso
#1?
Apply Clean Air
YES NO
Activate menu button 1
Apply air from canister
MAN-0090 Rev 4 H2S Solid State Sensor
or use clean ambient
Activate menu button 1
to select
FULL Calibration
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Z & SPAN ZERO
Activate menu button 3
ZERO
to select
Calibration
Page 18
5.1.3 Cross sensitivity
This relates to the fact that certain compounds and or gases can cause a reaction and hence some effects or
response from the sensor. See Table 6 below for a list of these cross sensitive gases/compounds. For more
information, please contact the manufacturer.
Table 6: List of cross sensitive gases/compounds
Cross sensitive gas Cross sensitive gas concentration Reading
Methanol 100ppm 20ppm
Methane 1000ppm 10ppm
Hydrogen 50ppm 3 ppm
Carbon monoxide 500ppm < 2ppm
5.2 Sensor Replacement Procedure
Sensors are pre-calibrated at the factory but field calibration must be performed as a part of commissioning.
When a calibration can no longer be performed or the sensor is not operating properly the sensor module may
need to be replaced. Refer to steps below for replacing sensor module.
Warning Do not open sensor enclosure in a classified area.
Note: Components are ESD sensitive, as a result all ESD rules and procedures should be observed. See
Appendix A for ESD guidelines.
To replace the sensor module:
1. Remove power from sensor.
2. Remove the locking ring by loosening the set crews with 1.5 mm Allen Key tool.
3. Remove the bottom part of the sensor enclosure by turning in a counter clockwise direction to expose
the sensor module.
4. Carefully remove sensor from sensor enclosure.
5. Align and properly fit replacement sensor module.
6. Install and hand-tighten the bottom part of the sensor enclosure by turning in a clockwise direction.
7. Install the locking ring by tightening the set screws with 1.5 mm Allen Key tool.
8. Restore power to sensor via transmitter.
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Page 19
5.3 Troubleshooting
Sensors and controllers / transmitters are not designed to be repaired in the field. If problems should develop,
first check for faulty wiring, confirm proper voltage to sensor, and attempt a calibration. If problems persist,
please contact Net Safety’s Service Department first by phone to try and resolve any issues. If issues cannot be
resolved, please follow the procedure on next page, on ‘how to return equipment.’
5.4 Storage
The sensor and its electronic components/parts should be stored in locations free from dust and moisture. The
storage temperature should be well within the limits of the certified temperatures of the equipment. See
Appendix C for certified temperatures.
5.5 Spare Parts / Accessories
Table 7: Available Spare Parts
Description Net Safety Part Number
Calibration Cup / Splash Guard CCS-1
Separation Kit JB-MPD-A (aluminum) or JB-MPD-S (316 stainless steel)
Dust Filter Assembly DSC-1
Replacement Toxic Solid State H2S Sensor ST321-100
IP66/67 Hydrophobic Filter IPF-001
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Page 20
5.6 How to Return Equipment
A Material Return Authorization number is required in order to return equipment. Please contact Net Safety
Monitoring at (403) 219-0688, before returning equipment or consult our Service Department to possibly avoid
returning equipment.
If you are required to return equipment, include the following information:
1. A Material Return Authorization number (provided over the phone to you by Net Safety).
2. A detailed description of the problem. The more specific you are regarding the problem, the quicker our
Service Department can determine and correct the problem.
3. A company name, contact name and telephone number.
4. A purchase order, from your company, authorizing repairs or request for quote.
5. Ship all equipment, prepaid to: Net Safety Monitoring Inc.,
2721 Hopewell Place NE,
Calgary, Alberta, Canada, T1Y 7J7
6. Mark all packages: RETURN for REPAIR.
7. Waybills, for shipment outside Canada, must state: Equipment being returned for repair
All charges to be billed to the sender
Ensure a duplicate copy of the packing slip is enclosed inside the box indicating item 1 – 4 along with the
courier and account number for returning the goods.
Pack items to protect them from damage and use anti-static bags or aluminum-backed cardboard as protection
from electro-static discharge.
ALL equipment must be shipped prepaid. Collect shipments will not be accepted.
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Page 21
Appendix
Appendix A: Electrostatic Sensitive Device (ESD)
Definition: Electrostatic discharge (ESD) is the transfer, between bodies, of an electrostatic charge caused by
direct contact or induced by an electrostatic field.
The most common cause of ESD is physical contact. Touching an object can cause a discharge of
electrostatic energy—ESD! If the charge is sufficient and occurs near electronic components, it can damage
or destroy those components. In some cases, damage is instantaneous and an immediate malfunction occurs.
However, symptoms are not always immediate—performance may be marg inal or seemingly normal for an
indefinite period of time, followed by a sudden failure.
To eliminate potential ESD damage, review the following guidelines:
• Handle boards by metal shields—taking care not to touch electronic components.
• Wear grounded wrist or foot straps, ESD shoes or heel grounders to dissipate unwanted static energy.
• Prior to handling boards, dispel any charge in your body or equipment.
• Ensure all components are transported and stored in static safe packaging
• When returning boards, carefully package in the original carton and static protective wrapping
• Ensure ALL personnel are educated and trained in ESD Control Procedures
In general, exercise accepted and proven precautions normally observed when handling electrostatic sensitive
devices. A warning label is placed on the packaging, identifying product using electrostatic sensitive
semiconductor devices.
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Page 22
Appendix B: Resistance Table
Resistance shown is one way. This figure should be doubled when determining closed loop resistance.
Distance
(Feet)
100 1.02 0.64 0.40 0.25
200 2.03 1.28 0.80 0.51
300 3.05 1.92 1.20 0.76
400 4.06 2.55 1.61 1.01
500 5.08 3.20 2.01 1.26
600 6.09 3.83 2.41 1.52
700 7.11 4.47 2.81 1.77
800 8.12 5.11 3.21 2.02
900 9.14 5.75 3.61 2.27
1000 10.20 6.39 4.02 2.53
1250 12.70 7.99 5.03 3.16
1500 15.20 9.58 6.02 3.79
1750 17.80 11.20 7.03 4.42
2000 20.30 12.80 8.03 5.05
2250 22.80 14.40 9.03 5.68
2500 25.40 16.00 10.00 6.31
3000 30.50 19.20 12.00 7.58
3500 35.50 22.40 14.10 8.84
4000 40.60 25.50 16.10 10.00
4500 45.70 28.70 18.10 11.40
5000 50.10 32.00 20.10 12.60
5500 55.80 35.10 22.10 13.91
6000 61.00 38.30 24.10 15.20
6500 66.00 41.50 26.10 16.40
7000 71.10 44.70 28.10 17.70
7500 76.10 47.90 30.10 19.00
8000 81.20 51.10 23.10 20.20
9000 91.40 57.50 36.10 22.70
10000 102.00 63.90 40.20 25.30
AWG #20
0.5mm2
AWG #18
0.8mm2
AWG #16
1.0mm2
AWG #14
2.0mm2
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Appendix C: Millennium II Toxic Solid State H2S Sensor
Specifications
SENSOR Toxic Solid State H2S
Performance
20 ppm range 50 ppm range 100ppm range
Response Time
Accuracy
Zero Drift 2ppm over 6 month
Repeatability +/- 1ppm or 5% Full Scale, whichever is greater
Environmental
Temperature
RH 0 – 95% RH non condensing
T20< 7.0sec
T50< 13.0sec
T90< 17.0sec
T20< 7.0sec
T50< 13.0sec
T90< 18.0sec
+/- 2ppm or 10% of reading, whichever is greater
Performanceverified:‐40°Cto+65°C
Certified:‐40°Cto+60°C
T20< 7.0sec
T50< 12.0sec
T90< 19.0sec
Metallurgy Aluminum (AL6061) or Stainless Steel (316 SS)
IP / Nema Rating IP64 / NEMA 4X
Weight
Separation
Separation Up to 2000 feet / 600 meters with 16 AWG wires
Approvals
Aluminum (AL6061) enclosure: 0.4kg/1.0lbs,
Stainless Steel (SS316) enclosure: 1.4kg/3.5lbs
Class I, Div1, Grps BCD; Class I, Zone 1, AEx/Ex d IIB+H2, T5, IP64, Type 4X,
-40°C < Ta < +60°C. ISA-92.0.01
Approvals
0575 II 2G, Ex d IIB+H2, T5, IP64
FM07ATEX0011X.
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Page 24
NetSafetyMonitoringInc.
2721HopewellPlaceNE,Calgary,ABCanadaT1Y7J7
1‐866‐FIREGAS(347‐3427)|ph.(403)219‐0688|fx.(403)219‐0694
http://www.net‐safety.com
PRODUCTSERVICESCONTACTINFORMATION
Telephone[8am‐5pmMDT]:(403)769‐6074|(403)717‐8219
Fax:(403)219‐0694Email:productservices@net‐safety.com
http://www.net‐safety.com/service/product_services.html
|Email:nsmsales@net‐safety.com
MAN-0090 Rev 4 H2S Solid State Sensor
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Net Safety Monitoring Inc. 24
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