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1. GAS DETECTION - GLOSSARY OF TERMS
2. NET SAFETY GAS DETECTORS - GENERAL
What is the difference between the Millennium II and the Millennium?
The Millennium is a single channel transmitter that is used with specific combustible and toxic
gas sensors and our airborne particle monitor (APM). The Millennium II Series is our next generation gas detector. An optional dual channel
transmitter available with interchangeable Catalytic Bead, Infrared, Electrochemical, and Solid State MOS Smart sensors.
These sensors are immediately recognized by the transmitter and easily configured. The Millennium II also has enhanced environmental
performance capabilities. Both are certified for Class I, Division 1 areas, while the Millennium II certifications make it
suitable for many additional installations worldwide and is qualified SIL2.
What is the difference between the Millennium's and the GS2?
Both Millennium Series include transmitters that can be used in conjunction with combustible and toxic
gas sensors, airborne particle monitors (APM), and oxygen deficiency sensors. The GS2 is
a transmitter that can only be used with toxic gas sensors. The Millennium's are certified
for Class I, Division 1 areas, while the GS2 is certified for Class I, Division 2 areas.
Where should I locate the sensor and transmitters?
Transmitters should be mounted near eye-level for easy field operation. The
sensor should be located where the specific gas of concern is most likely to accumulate.
Consult the User Manual for tips on locating the Transmitter and Sensor.
What is the stabilization time required before I can calibrate a sensor?
In general, Net Safety recommends that you install and power up units for at
least 24 hours prior to first calibration to allow the sensor to adjust to local
environmental conditions. Consult the User Manual for specific information.
How often should I calibrate the sensors?
Net Safety recommends that most sensors should be calibrated at least every three months (please consult your manual).
However, depending on the environment in which the sensor is installed, more frequent calibration may be required.
Should I "bypass" alarm relays during calibration or routine maintenance?
Yes! Relays are connected to a system PLC and should be placed in bypass mode.
How do I know if calibration was successful?
The Millennium II, Millennium and GS2 Senior will prompt you with the message, "Cal Complete".
The Millennium II BASIC and GS2 Junior LEDs and current output (if applicable) change to reflect a successful
calibration. Consult the User Manuals for LED states and specific current outputs.
If I separate the sensor from the Transmitter, what is the maximum
separation distance?
Net Safety recommends no more than 500 feet when using a minimum 18 AWG shielded
copper instrument cable. Shielded copper instrument wire (minimum 16 AWG) should
be used for separations up to 2000 feet. Contact Net Safety for installations
requiring distances over 2000 feet.
What output configurations are available?
The Millennium II Series has a full range of output combination options:
Analog; Relay; RS485 Digital Modbus; and HART Protocal. Please state your requirements at the time of ordering.
How do I test a Net Safety detector?
Net Safety recommends a response check every 3 months. This involves the application of
calibration gas to the sensor, then the observation of the response LEDs, analog output,
and external monitoring equipment.
What regulatory standards does the Millennium II Series meet?
Millennium II Transmitters are have received CSA, ANSI, ATEX, INMETRO, and GOST-R
certification for Class I, Division 1, Groups B, C, and D - Class 1, Zone 1. Factory Mutual (FM)
6310, 6320 certification, CSA 22.2 No152, IEC 61779, SIL2 by TÜV SÜD, ABS Marine, and NEMA Type 4x with IP67 rated housings.
What regulatory standards does the Millennium Series meet?
Millennium Transmitters are certified CSA and NRTL within Canada and the U.S.A. The
Millennium is certified for Class I, Division 1, Groups B, C, and D.
What regulatory standards does the GS2 meet?
GS2's are certified CSA for Canada and the U.S. They are certified Class I, Division 2,
Groups A, B, C, and D.
Can I install the Net Safety gas detection products outdoors?
Yes! All our tranmitters and sensors come in enclosures suitable for
indoor or outdoor installations - extreme cold or heat, dryness or moisture.
3. COMBUSTIBLE GAS DETECTION EQUIPMENT
How long will my catalytic bead sensor last?
Net Safety catalytic bead sensors have a 5 year warranty, we recommend replacing the sensor shortly after this time.
Avoiding exposure to such environmental factors as dirt, humidity, heat, etc., can extend sensor life.
How long will my Infrared sensor last?
Net Safety Infrared sensors have a 5 year warranty, we recommend replacing the sensor shortly after this time. Avoiding exposure to such
environmental factors as dirt, humidity, heat, etc., can extend sensor life.
What benefits do catalytic bead sensors have over Infrared technology?
Catalytic bead gas detectors are a more conventional technology with a simple operational principle (reliable).
They therefore cost less and tend to have a faster response time than IR detectors.
What benefits do Infrared sensors have over catalytic bead technology?
IR sensors don't have to be calibrated as often as catalytic bead sensors, and therefore
require much less maintenance. IR sensors are also inherently resistant to contamination
by chemicals or prolonged gas exposure like traditional catalytic bead sensors are.
Can I change the relay settings for Net Safety combustible gas detectors?
Yes. There are two settings for Relay Options: Low and High. The Fault Relay is fixed as
Energized/Non-latching and cannot be changed. The low alarm level, coil energization and
latch status for low alarm are set first; high alarm level, coil energization and latch
status for high alarm are then set. All ranges are in %LEL.
4. TOXIC GAS DETECTION EQUIPMENT
How long will my ST Series sensor last?
In general, sensor life is at least 3 to 4 years for electrochemical and solid state MOS sensors. Avoiding exposure to
such environmental factors as dirt, humidity, heat, etc., can extend sensor life.
Can I change the relay settings for the ST Series?
Yes. There are two settings for Relay Options: Low and High. The Fault Relay is fixed as
Energized/Non-latching and cannot be changed. The low alarm level, coil energization and latch
status for low alarm are set first; high alarm level, coil energization and latch status for
high alarm are then set. All ranges are in PPM.
What output configurations are available for the ST Series?
The ST Series has a full range of output options: Analog; Relay; RS485 Digital Modbus; and HART Protocal
There are also options for some toxic sensor elements: 0 to 20 ppm, 0 to 50 ppm, and 1 to 100 ppm.
Net Safety provides a choice of different toxic gas sensors, please state your requirements when ordering.
What is the maximum storage period for Net Safety's ST Series (toxic) sensors?
The maximum storage period for Net Safety's toxic sensors is six months. When stored,
the sensors should be kept in the containers in which they were supplied in clean dry areas
between 0°C and 20°C. The sensors should not be stored in areas containing organic solvents
or flammable liquid stores. Under these conditions, the sensors may be stored for up to six
months without the length of their expected operating life being reduced.
5. NET SAFETY FLAME DETECTORS - GENERAL
Can I change the time delay or sensitivity settings for Net Safety Flame Detectors in the field?
Yes! Net Safety Flame Detectors have easily accessible internal DIP Switches you can set to a 3, 4, 5 or 6
seconds delay or high/low sensitivity. Consult the User Manual for detailed instructions.
What is the easiest way to sight and align a Net Safety Flame Detector?
Net Safety recommends using our Laser Alignment Tool. This device is temporarily placed
over the fire head and the laser is used to establish the correct line of sight. Once positioned,
the swivel mount is tightened to lock the detector in place and the Alignment Tool is removed.
What regulatory standards do Net Safety Flame Detectors meet?
Net Safety flame detectors have received CSA, ANSI-UL/ISA, ATEX, INMETRO, and GOST-R
certification for Class I, Division 1, Groups B, C, and D - Class 1, Zone 1. As well as Factory Mutual (FM)
3260 certification, SIL2 by exida®, and ABS Marine approvals.
Can I install Net Safety Flame Detectors outdoors?
Yes! The all Net Safety flame detectors are housed in a NEMA 4X enclosures with IP66 ratings suitable for indoor or outdoor installations.
6. TRIPLE IR - UV/IR DETECTORS
Phoenix Triple IR
Where should I locate the Phoenix Triple IR Flame Detector?
The Phoenix Triple IR Flame Detector is designed for Class I, Division 1 (Class I, Zone 1) hazardous locations.
It should be located in a manner so as to maximize monitor coverage within areas of potential
hazard. The distance between the detector and potential hazard is dependant on the potential fuel source and anticipated
intensity of the IR radiation source.
The table below shows the maximum detection range with the Phoenix Triple IR Flame Detector set to the highest sensitivity level for sample fuels.
| FUEL |
FIRE SIZE |
MAX DISTANCE |
| N-Heptane |
1' x 1' |
210 feet |
| Methane |
32" plume |
140 feet |
| Gasoline |
1' x 1' |
150 feet |
Why do I need Triple Infrared (IR) technology?
Depending on fire size and fuel, the Phoenix Triple IR Flame Detector can detect a fire from up to 210 feet and is immune to lightning, arc welding, sparks/arcs and is solar blind.
Through the combination of our three precisely tuned Infrared sensors, our proprietary Automatic Digital Zone (ADZ) technology, and
user selectable time delay and sensitivity settings, the Phoenix Triple IR Flame Detector is able to achieve the highest false alarm
immunity possible of any flame detector available.
What output configurations are available for the Phoenix Triple IR Flame Detector?
The Phoenix has a full range of output options: Analog; Relay; RS485 Digital Modbus; and HART Protocal. Please state your requirements at
the time of ordering.
How do I test the Phoenix Triple IR Flame Detector?
Net Safety has developed a test lamp specifically for the Phoenix Triple IR to be tested while in a hazardous location.
Simply point the lamp at the Phoenix Triple IR and initiate test sequence. The Phoenix Triple IR is also designed with an
Automatic Visual Integrity (VI) feature which tests the detector's optical surface every three minutes (that is, unless
a momentary background IR condition is detected in which case the VI timer resets). The Phoenix Triple IR can also be tested
while in a non-hazardous area using a real fire. Consult the User Manual for further testing information.
UV/IR
Where should I locate the UV/IR Flame Detector?
The UV/IR Flame Detector is designed for Class I, Division 1 (Class I, Zone 1) hazardous locations. The UV/IR Flame Detector
should be located in a manner so as to maximize monitor coverage within areas of potential
hazard. The distance between the detector and potential hazard is dependant on the potential fuel source and anticipated
intensity of the IR radiation source.
The table below shows the maximum detection range with the UV/IR Flame Detector set to the highest sensitivity level for sample fuels.
| FUEL |
FIRE SIZE |
MAX DISTANCE |
| N-Heptane |
1' x 1' |
140 feet |
| Methane |
32" plume |
100 feet |
| Gasoline |
1' x 1' |
120 feet |
Why do I need Ultraviolet/Infrared (UV/IR) technology?
Since the UV/IR requires two different radiation sources to alarm, it minimizes false alarm events.
False alarms are also minimized due to immunity to lightning, arc welding, sunlight, and hot body radiation.
What output configurations are available for the UV/IR Flame Detector?
The UV/IR has a three output options: Analog; Relay; and HART Protocal. Please state your requirements at the time of ordering.
How do I test the UV/IR Flame Detector?
Net Safety has developed a test lamp specifically for the UV/IR to be tested while in a hazardous location.
Simply point the lamp at the UV/IR and initiate test sequence. The UV/IR is also designed with an Automatic
Visual Integrity (VI) feature, which tests the detector's optical surface every 90 seconds, and
a Manual Visual Integrity feature to help with maintenance planning. The UV/IR can also be tested while in
a non-hazardous area using a real fire. Consult the User Manual for further testing information.
7. ADDITIONAL PRODUCTS
RACK MOUNT CONTROLLER (RM2)
Where should I locate the RM2 Controller?
The RM2 Controller can be located in a Class 1, Division 2 area although it is most often found in
a general purpose location such as a control room. NSM has a variety of rack mount cages available to house the RM2 assembly.
What monitoring devices can I connect to the RM2?
Any two NSM, 4-20 mA fire or toxic gas sensors can be connected directly to the RM2. The RM2 is also
compatible, in any combination, with the Millennium Premium Combustible controller and LEL sensor to accommodate redundant display requirements. The RM2 can also interface with other, third-party 4-20 mA detectors.
Do I need any special hardware to communicate with the RM2?
A standard RS-232 to RS-485 modbus communication cable is required. NSM has a cable kit (RM2-COM-KIT)
available for purchase. Consult the NSM Price List for pricing.
Do I need any special software to configure the RM2?
No! Standard RS-232 compatible terminal software, such as HyperTerminal-, is used to communicate
with the RM2. Other configuration settings are done at the RM2 front panel and require no additional software.
How many external control devices can I connect to the RM2?
The RM2 has 5 relays-a common Fault/Failure relay as well as a Fault/Fire alarm and Low/High alarm
relay for each channel-so two external devices.
What is the maximum separation distance between the RM2 and the sensor?
Net Safety recommends no more than 500 feet when using a minimum 18 AWG shielded copper instrument
cable. Distances greater than 500 feet are possible by using lower gauge cable. Contact Net Safety for
installations requiring distances over 500 feet.
Can I install the RM2 outdoors?
Unless the RM2 is housed in some form of weather-proof enclosure, the RM2 is not suitable for outdoor installations.
When should I buy an RM2?
The RM2 is an excellent choice when:
 re-fitting of an existing product is required
event monitoring functionality is needed
multiple outputs are needed
a rack or wall mount controller installation is required
flexible hardware combinations and the ability to expand is important
Is the RM2 UL or NFPA 72 compliant?
No! However, the RM2 is certified CSA and NRTL/C for hazardous locations and Factory Mutual (FM) certified to Class 3260 for fire alarm systems.
Can the RM2 provide RS-485 output using the RTU Modbus protocol to interface with other control systems?
An optional RS-485 output on the RM2 is available. Contact NSM for pricing and availability.
SOLAR SHIELD
How do I determine the size of solar array and number of batteries required?
Simply inform your Net Safety Representative of your site's daily load requirements,
the specific latitude of site, the length of subnormal isolation periods experienced at
the site, and the number of days of reserve power necessary to maintain the site.
Your Net Safety Representative will be happy to perform the necessary calculations and
provide you with a custom designed Solar Shield system.
How long does it take to install the Solar Shield?
Net Safety Installers can have your SolarShield package installed in less than half a day.
Can I expand the Solar Shield system if I need more power later?
Absolutely! Additional batteries and solar panels can be connected to a previously installed system.
How many days of autonomy does the Solar Shield provide?
Net Safety custom designs a Solar Shield system based on the specific requirements of your site.
The Solar Shield provides a minimum of 14 days autonomy.
Do I need to perform regular maintenance to ensure continuous operation? How often?
A regular maintenance schedule should be developed based on the environmental factors of
each installation site. The solar panels will require cleaning to remove not only dirt and
dust but also any ice or snow build up. As part of the regular fire/gas detector maintenance
schedule, batteries should be checked to ensure tight connections.
What cables are included?
The detectors are pre-wired for you. There is a 20 ft quick connect cable between the controller
and solar panel as well as a 10 ft quick connect cable between the controller and battery.
An optional 50 ft power cable is available as well as optional battery interconnect cables to daisy-chain batteries.
What configuration options does the Solar Shield offer?
You have a choice of 12 or 24 V DC, single channel, dual channel, analog, analog & relay, or analog & digital RS 485 output.
Can I install the Solar Shield controller outdoors?
Yes! The Solar Shield is housed in a rugged and secure NEMA 3R enclosure suitable for indoor or
outdoor installations. Mounting flanges are provided to allow enclosures to be securely bolted
into place as well as pad lock latches for total security.
What mounting options are available for the Solar Shield?
The Solar Shield comes standard with flanges for wall mounting. An optional pole mount assembly is also available.
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