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MX6-P7A3R211 MX6 iBrid Multi-Gas Monitor, HC (IR-Propane), Cl2, HCl, O2, PID, Lithium-ion Extended Range Battery, UL/CSA/ATEX/IECEx, Pump, English by Industrial Scientific

The MX6 iBrid® is more than an intelligent hybrid of Industrial Scientific's best monitoring technologies—it's the most adaptable six-gas monitor on the market. With hundreds of possible sensor combinations, and a robust list of available configuration settings, the MX6 iBrid is ready to monitor oxygen, toxic and combustible gas, and volatile organic compounds (VOCs).

As your work changes, so can your MX6 iBrid. It uses five sensor slots to detect up to six gases. Each of those sensor slots accepts a variety of sensors, which means you can use the instrument with a PID sensor one day and an infrared sensor the next. What's more, settings allow you to adapt the instrument's behavior for your application. If you need to use a benzene PID response factor for one application, and butadiene for others, the familiar menu structure will allow you to quickly change settings.

The rugged MX6 iBrid carries our Guaranteed for Life™ warranty and is compatible with DSX™ Docking Stations. With a DSX Docking Station, maintenance is simplified and data becomes more than a spreadsheet filled with logged readings. Proactively manage your gas detection fleet—track trends, know when instrument maintenance will be required, and understand how your MX6 iBrid instruments are being used.

• 24 "Plug-and-Play" field-replaceable sensors including PID and Infrared options
• Up to 6 gases monitored simultaneously
• Simple, user-friendly, customizable, menu-driven navigation
• Five-way navigation button
• Durable, concussion-proof overmold
• Optional integral sampling pump with strong 30.5 meter (100 feet) sample draw
• Full-color graphic LCD is highly visible in a variety of lighting conditions
• Powerful, 95 dB audible alarm

Wall Mount, Adjustable, For up to 30in. Fans, Stainless Steel

MX6-0123S217 MX6 iBrid Multi-Gas Monitor, CO, H2S, O2, LEL (IR-CH4), Lithium-ion Extended Range Battery, UL/CSA/ATEX/IECEx, Pump, Portugese by Industrial Scientific

The MX6 iBrid® is more than an intelligent hybrid of Industrial Scientific's best monitoring technologies—it's the most adaptable six-gas monitor on the market. With hundreds of possible sensor combinations, and a robust list of available configuration settings, the MX6 iBrid is ready to monitor oxygen, toxic and combustible gas, and volatile organic compounds (VOCs).

As your work changes, so can your MX6 iBrid. It uses five sensor slots to detect up to six gases. Each of those sensor slots accepts a variety of sensors, which means you can use the instrument with a PID sensor one day and an infrared sensor the next. What's more, settings allow you to adapt the instrument's behavior for your application. If you need to use a benzene PID response factor for one application, and butadiene for others, the familiar menu structure will allow you to quickly change settings.

The rugged MX6 iBrid carries our Guaranteed for Life™ warranty and is compatible with DSX™ Docking Stations. With a DSX Docking Station, maintenance is simplified and data becomes more than a spreadsheet filled with logged readings. Proactively manage your gas detection fleet—track trends, know when instrument maintenance will be required, and understand how your MX6 iBrid instruments are being used.

• 24 "Plug-and-Play" field-replaceable sensors including PID and Infrared options
• Up to 6 gases monitored simultaneously
• Simple, user-friendly, customizable, menu-driven navigation
• Five-way navigation button
• Durable, concussion-proof overmold
• Optional integral sampling pump with strong 30.5 meter (100 feet) sample draw
• Full-color graphic LCD is highly visible in a variety of lighting conditions
• Powerful, 95 dB audible alarm

2813-708-001 EC 28i Intrinsically Safe Transmitter with Carbon Monoxide (CO-H) Reduced H₂ Sensitivity Sensor, 1 ppm Resolution, 0 - 500 ppm Range, No Display by GfG

Wherever hazards are expected, the EC 28 transmitter and GfG's proven monitoring systems are the right choice for reliable surveillance. The ATEX-certified Ex-proof design, and bright alarm LEDs provide the highest safety in hazardous areas. The gas alarm not only alerts the person in the control room of hazards, but also the person on-site.

Smart sensor technology allows a user to install the transmitter or to replace a sensor within a few seconds - just plug the sensor into the transmitter. Adjustments are done directly at the transmitter using touch keys or with the RC2 remote control (one-person calibration).

Accurate sensors and integrated temperature compensation provide the highest measurement accuracy. Low maintenance requirements and the long sensor life reduce your cost of ownership.

Features

• Increased safety design to reduce installation cost in potentially hazardous locations
• Non-intrusive AutoCal® calbiration adjustment
• Uses electrochemical detection principle
• Output signal: 4-20 mA
• Intrinsically safe (i) EX-Proof
• Available in two configurations: Blind (no display); Display
• Barriers are required
• EX- conduit is not required

10207465 Altair io360 Gas Detector, 4-Gas Black 16pk, ATEX by MSA

The ALTAIR® io360 Gas Detector offers four-gas detection for high risk areas, including confined spaces, perimeter and general area monitoring. The ALTAIR io360 combines the simple set-up of a smart home device, while allowing local or remote monitoring of hazardous areas. The ultra-long battery life keeps the focus on safety and less on maintenance. The ALTAIR io360 delivers IP68 ruggedness and best-in-class, XCell sensors, the performance expected from MSA.

• Four-gas detection with a catalytic bead sensor
• Compact, portable design
• Ultra-long battery life with 50-60 days of 4-gas runtime (80 or more days as toxic & O2)
• Easy set-up, similar to a smart home product
• Factory pre-configured networks that are ready-to-go out of the box
• Android or iOS Safety io Grid mobile app makes setup and configurations simple
• Connect up to 32 ALTAIR io360 Gas Detectors with MSA HUB to form mesh network, share alarms, and extend range
• MSA HUB connects with Safety io Grid via wifi or ethernet connectivity
• Integrated D-ring and 50lb (22kg) magnet provides placement options
• IP68 toughness that can withstand submersion, sprays, and weather
• 10ft (3m) drop tested

72-PNA-C GX-3R Pro 3 Gas Personal Monitor - combo H2S / CO - CO2, 10,000 ppm, IR (ETA Aug 2019) - Li-Ion Battery Pack with 100-240 VAC Charger by RKI Instruments

The GX-3R Pro is the world's smallest 5-gas monitor weighing only 4.58 ounces and fits in the palm of your hand (2.9" W x 2.6" H x 1.06" D). It simultaneously monitors and displays 5 different gases. In addition to monitoring standard confined space gases, LEL, O₂, CO, & H₂S, the GX-3R Pro has a 5th channel where you can add infrared or toxic sensors. Two of the four sensor slots have interchangeable sensors providing flexible configurations, which can easily be changed in the field.

The GX-3R Pro comes equipped with Bluetooth wireless communication, man-down alarm, the choice of alkaline or rechargeable power supply, and a 3 year warranty. The Lithium-ion battery pack will operate for 25 hours and will fully charge in 3 hours.

The GX-3R Pro utilizes Bluetooth communication to display direct gas readings from the instrument to a phone app, which is available free on either iOS or Android phones. Automatic notifications can be programmed to send text or email messages, if there is an alarm event from the GX-3R Pro.

Safety supervisors will appreciate the non-compliance indicator. The instrument flashes it's 3 LED lights every 30 seconds in the following conditions; if the instrument has not been bump tested, or if calibration is due, or if there was a gas alarm event. The 3 LED lights will continue to flash once every 30 seconds until the non-compliance condition has been resolved. The 30 second interval is adjustable.

Features

• Smallest & lightest 5 gas monitor: 2.9" W x 2.6" H x 1.06" D , 4.58 ounces
• Simultaneous detection of 5 gases: LEL, O₂, H₂S, CO, and other optional sensors; H₂ Compensated CO sensor available
• Simple 2-button operation
• Bluetooth communication with iOS & Android App
• Non-Compliance Indicator
• 3 user adjustable alarm levels
• Panic Alarm - Tap instrument twice
• Man Down Alarm
• Impact resistant body
• Large full dot, auto-backlit display with auto-rotation
• Stealth mode for law enforcement
• Field replaceable sensors & filters
• Water and dust resistant design, IP66/68
• 3 Year warranty

Applications

• Personal monitoring
• Confined spaces
• Refineries/petrochemical
• Utilities
• Oil and Gas
• Water/wastewater
• Fire services
• Construction

*Please note we can only ship RKI products to customers within the United States

Part Number: H126525LM2

GD-70DEA-CO-12 GD-70D, CO(carbon monoxide), 0-75 ppm w/ESU-231 sensor, UL, w/ethernet&4-20 mA outputs (Ethernet OFF) by RKI Instruments

RKI Instruments has been making high quality gas detection and monitoring units for over 15 years. With an emphasis on safety and reliability, RKI Instruments excels at providing the best products in gas detection and sensor technology on the market. Every year, RKI strives to improve its product offering and scours the globe for the latest technologies and innovative designs. With the introduction of the GD-70D Series Intelligent Gas Detector, employers and workplace safety managers can feel confident that they have purchased a reliable detector that is built to last.

GD-70D Series Intelligent Gas Detector

The GD-70D Series Intelligent Gas Detector is a new smart gas detection transmitter that monitors combustibles, oxygen, and a wide range of toxic gases. The unit can be used as a standalone device, integrated with other PLC systems, or integrated with RKI's Beacon series of single and multi-channel controllers. Its common platform integrates numerous detection methods and requires very little maintenance.

Exclusive Features

The plug and play intelligent sensors make for easy setup and calibration by internally retaining calibration and sensor data. This allows workers to replace sensors while in the field without the need to reprogram the equipment. For little maintenance and optimal reliability, the internal technology automatically adjusts for long-term zero and span drift. The pump flow is also self-tuning for low maintenance functioning. In general, the smart sensors use electrochemical cell detection, semiconductor detection, pyrolysis-particle detection, galvanic cell detection, and catalytic combustion detection.

The GD-70D Series features a large LCD display that easily reads all notifications and provides a color coded graph for alarm status (first and second alarms are red, and fault alarms are yellow). The LCD screen displays the pyrolyzer connection, gas concentration, detection unit of measurement, the detected gas, the maintenance status, sensor identification, the flow rate, a graph of gas concentration, error codes, and alarm points. All operational settings are completely user adjustable from the front panel. The unit also has a self-diagnosing function which detects sensor trouble and system failure. The Intelligent Gas Detector has a convenient troubleshoot feature through its firmware. This allows users to investigate and resolve their own equipment issues while minimizing maintenance costs.

Specifications

The Intelligent Gas Detector is a convenient size for workplace and wall space efficiency with dimensions of 2.8"D x 4.7"H x 5.9"D and weighs approximately 2 pounds. It can be mounted to a wall easily with a base plate and 2 or 3 screws. Sensor replacements and pump replacements can be performed quick and easily without tools.

*Please note we can only ship RKI products to customers within the United States

02104-N-7022 Searchline Excel Infrared Open Path Flammable Gas Detector, Medium range TX/RX 40 m to 120 m INMETRO current source by Honeywell Analytics

The Searchline Excel is the World's best selling infrared open path gas detector with over 25,000 units installed in challenging applications throughout industry. From the Arctic Circle to middle eastern deserts, customers have repeatedly selected the Searchline Excel as their preferred choice.

Product Evolution

Honeywell Analytics pioneered the original design of open path infrared flammable gas detectors with the introduction of the original Searchline back in 1987. Since then we have continued to work in conjunction with major international oil and gas companies to fully understand the demanding application requirements of these systems.

In 1998 we introduced Searchline Excel which has become the industry standard for open path gas detection by meeting and exceeding all customer driven demands.

With continuous improvement and the highest quality manufacturing and control processes, Honeywell Analytics Searchline Excel Open Path flammable gas detector provides best in class gas detection. Excel is often the chosen primary flammable gas detector in conjunction with Searchpoint Optima Plus as complimenting flammable point detection.

Why open path gas detection?

Open path detectors complement the use of individual point detectors and offer many significant benefits including:

• Reliable flammable gas detection, proven in use
• Wider area coverage - most likely to pick up any leak
• Very high speed of response
• Failsafe - no unrevealed failure modes - no possibility of blocked gas path to detector
• Detector location not as critical
• Indicates size of hazard
• Simple set up and commission
• Replaces multiple point devices

Applications include

• Offshore platforms & vessels (FPSO's)
• Downstream chemical processing plants
• Gas transport and pipelines
• Large storage areas & buildings
• Perimeter detection

Features and Benefits

• Double band pass filters that fully compensate for all types of fog, rain and/mist interference
• 100% Solar Immune
• Correct operation under partial obscuration conditions
• High vibration resilience
• Radially symmetrical and bonded window heating delivers good low temperature performance
• Coaxial optics delivers best in class performance and resilience to partial obscuration
• Fully temperature compensated solid state detectors
• Low power consumption in all conditions
• Simple 'lock on' alignment tool
• No extra 'software alignment' required
• Higher power and more robust design telescope
• Optional Modbus RS485 multi drop output
• FM hazardo

MX6-L1036201 MX6 iBrid Multi-Gas Monitor, LEL,CO,O2,NH3,LE,D,E by Industrial Scientific

The MX6 iBrid® is more than an intelligent hybrid of Industrial Scientific's best monitoring technologies—it's the most adaptable six-gas monitor on the market. With hundreds of possible sensor combinations, and a robust list of available configuration settings, the MX6 iBrid is ready to monitor oxygen, toxic and combustible gas, and volatile organic compounds (VOCs).

As your work changes, so can your MX6 iBrid. It uses five sensor slots to detect up to six gases. Each of those sensor slots accepts a variety of sensors, which means you can use the instrument with a PID sensor one day and an infrared sensor the next. What's more, settings allow you to adapt the instrument's behavior for your application. If you need to use a benzene PID response factor for one application, and butadiene for others, the familiar menu structure will allow you to quickly change settings.

The rugged MX6 iBrid carries our Guaranteed for Life™ warranty and is compatible with DSX™ Docking Stations. With a DSX Docking Station, maintenance is simplified and data becomes more than a spreadsheet filled with logged readings. Proactively manage your gas detection fleet—track trends, know when instrument maintenance will be required, and understand how your MX6 iBrid instruments are being used.

• 24 "Plug-and-Play" field-replaceable sensors including PID and Infrared options
• Up to 6 gases monitored simultaneously
• Simple, user-friendly, customizable, menu-driven navigation
• Five-way navigation button
• Durable, concussion-proof overmold
• Optional integral sampling pump with strong 30.5 meter (100 feet) sample draw
• Full-color graphic LCD is highly visible in a variety of lighting conditions
• Powerful, 95 dB audible alarm

VTS-00232111101 Ventis MX4 Multi-Gas Monitor, H2S, O2, Li-ion Ext Range, Desktop Charger, Pump, Orange, UL/CSA, English by Industrial Scientific

The Ventis® MX4 is a four-gas monitor with the portability and size of a single-gas monitor. Eliminate the need for extra monitors and transition seamlessly from personal monitoring to confined space entry with the Ventis® Slide-on Pump— ideal for operators who wear their gas monitors primarily for personal protection but occasionally require a pump for confined space entries.

• Detect up to four gases with a wide range of sensor options
• Select alarm set points, set latch alarms, disable instrument shutdown while in alarm, and more
• Save time and reduce human error with maintenance and usage data available from iNet Control software
• Available with or without an integral pump, or with the Ventis Slide-on Pump for ultimate flexibility
• Non-pumped instruments compatible with 12-hour, 18-hour, or 20-hour batteries

The Ventis® Slide-on Pump

The Ventis® Slide-on Pump is ideally suited for operators who wear their gas monitors primarily for personal protection but occasionally require a pump for confined space entries. Available in black or safety orange and powered by its own battery, the slide-on pump is compatible with the Ventis MX4 and Ventis® Pro5 Multi-Gas Monitor.

• Convenient Sampling – Sample draw distance of up to 50 feet provides convenient sampling in a wide range of applications
• Easy to Attach – No tools are required to attach or remove the Ventis Slide-on Pump to or from the monitor
• Uses Same Batterys and Chargers as Ventis – Monitor and pump each use the same batterys, and can easily be exchanged between instruments
• Flexible Battery Options – Three available battery options make this pump extremely flexible in the field

0560 1113 Mini Waterproof Penetration Thermometer by Testo

Low in price, high in performance: the waterproof mini probe thermometer measures the core temperature of liquid, soft and powdery media as well as the ambient air temperature.

And when you're done, you can either clean your mini probe thermometer under running water or pop it into the dishwasher before returning it to the protective case that comes with the delivery. The mini probe thermometer also has an integrated clip to stop it from slipping out of your shirt or jacket pocket.

A variety of different applications for the waterproof mini probe thermometer

From checking the Sunday roast (but don't leave it in the oven!) to carrying out temperature checks during production processes; from measuring the air temperature in a/c units to checking the temperature of different media in garden centers or laboratories. The mini probe thermometer measures the air and the core temperature and is ideal for use in a variety of applications and environments.

• For quick 'n easy air and core temperature measurements
• Waterproof / dishwasher safe (IP67 rated)
• Ideal for a variety of different applications in kitchens / laboratories / industrial settings / garden centers
• Includes protective case / integrated clip

Includes:

Waterproof mini probe thermometer, protective case, integrated clip.

MX6-MH23Q513 MX6 iBrid Multi-Gas Monitor, CH4COHGH,H2S,O2,CO2IR,LEMPS by Industrial Scientific

The MX6 iBrid® is more than an intelligent hybrid of Industrial Scientific's best monitoring technologies—it's the most adaptable six-gas monitor on the market. With hundreds of possible sensor combinations, and a robust list of available configuration settings, the MX6 iBrid is ready to monitor oxygen, toxic and combustible gas, and volatile organic compounds (VOCs).

As your work changes, so can your MX6 iBrid. It uses five sensor slots to detect up to six gases. Each of those sensor slots accepts a variety of sensors, which means you can use the instrument with a PID sensor one day and an infrared sensor the next. What's more, settings allow you to adapt the instrument's behavior for your application. If you need to use a benzene PID response factor for one application, and butadiene for others, the familiar menu structure will allow you to quickly change settings.

The rugged MX6 iBrid carries our Guaranteed for Life™ warranty and is compatible with DSX™ Docking Stations. With a DSX Docking Station, maintenance is simplified and data becomes more than a spreadsheet filled with logged readings. Proactively manage your gas detection fleet—track trends, know when instrument maintenance will be required, and understand how your MX6 iBrid instruments are being used.

• 24 "Plug-and-Play" field-replaceable sensors including PID and Infrared options
• Up to 6 gases monitored simultaneously
• Simple, user-friendly, customizable, menu-driven navigation
• Five-way navigation button
• Durable, concussion-proof overmold
• Optional integral sampling pump with strong 30.5 meter (100 feet) sample draw
• Full-color graphic LCD is highly visible in a variety of lighting conditions
• Powerful, 95 dB audible alarm

GD-70D4S-CO-11 GD-70D Smart Transmitter, 0-150 PPM Carbon Monoxide, in NEMA 4X Housing, with Strobe, 115 / 220 VAC. by RKI Instruments

RKI Instruments has been making high quality gas detection and monitoring units for over 15 years. With an emphasis on safety and reliability, RKI Instruments excels at providing the best products in gas detection and sensor technology on the market. Every year, RKI strives to improve its product offering and scours the globe for the latest technologies and innovative designs. With the introduction of the GD-70D Series Intelligent Gas Detector, employers and workplace safety managers can feel confident that they have purchased a reliable detector that is built to last.

GD-70D Series Intelligent Gas Detector

The GD-70D Series Intelligent Gas Detector is a new smart gas detection transmitter that monitors combustibles, oxygen, and a wide range of toxic gases. The unit can be used as a standalone device, integrated with other PLC systems, or integrated with RKI's Beacon series of single and multi-channel controllers. Its common platform integrates numerous detection methods and requires very little maintenance.

Exclusive Features

The plug and play intelligent sensors make for easy setup and calibration by internally retaining calibration and sensor data. This allows workers to replace sensors while in the field without the need to reprogram the equipment. For little maintenance and optimal reliability, the internal technology automatically adjusts for long-term zero and span drift. The pump flow is also self-tuning for low maintenance functioning. In general, the smart sensors use electrochemical cell detection, semiconductor detection, pyrolysis-particle detection, galvanic cell detection, and catalytic combustion detection.

The GD-70D Series features a large LCD display that easily reads all notifications and provides a color coded graph for alarm status (first and second alarms are red, and fault alarms are yellow). The LCD screen displays the pyrolyzer connection, gas concentration, detection unit of measurement, the detected gas, the maintenance status, sensor identification, the flow rate, a graph of gas concentration, error codes, and alarm points. All operational settings are completely user adjustable from the front panel. The unit also has a self-diagnosing function which detects sensor trouble and system failure. The Intelligent Gas Detector has a convenient troubleshoot feature through its firmware. This allows users to investigate and resolve their own equipment issues while minimizing maintenance costs.

Specifications

The Intelligent Gas Detector is a convenient size for workplace and wall space efficiency with dimensions of 2.8 D x 4.7 H x 5.9 D and weighs approximately 2 pounds. It can be mounted to a wall easily with a base plate and 2 or 3 screws. Sensor replacements and pump replacements can be performed quick and easily without tools.

*Please note we can only ship RKI products to customers within the United States

Part Number: E126550LM6

BZ1-R230000111 Radius BZ1 Area Monitor, PID, H2S, O2, No Pump, UL/CSA, LENS Wireless, English by Industrial Scientific

When it comes to choosing equipment to protect your worksite from gas hazards, rely on the Radius® BZ1 Area Monitor. No other area monitor protects your workers longer in the field with less setup, user training, and time in the shop.

• Detect up to seven gases using 22 sensor options including PID
• Longest running area monitor with a typical run time of 7 days (168 hours)
• Extended Run Time Power Supply can extend battery to over 1 month
• Ultra-bright blue and red lights and attention-grabbing alarms with distinctive tones
• Audible alarms sound at 108 dB at 1 m to cut through high-noise environments
• Largest display of any area monitor on the market
• Intuitive text-based navigation and configuration
• Customizable alarm action messages such as "EVACUATE" or "VENTILATE"
• LENS™ Wireless enables communication between area monitors and Ventis® Pro5 personal monitors
• All-weather sensor deployment and 360-degree gas path for more accurate detection
• DualSense® Technology increases worker safety by using two sensors to detect the same gas

WD-20250-53 Industrial Digital Multimeter, IP67, with NIST-Traceable Calibration by Digi-Sense

Get quality instruments that deliver consistent, reliable measurements without depleting your budget. These durable, handheld multimeters are an economical alternative to higher-priced instruments on the market today.

Features

• Reliable measurements, guaranteed! Precalibrated to NIST-traceable standards
• Autoranging on select models, automatically selects the optimal measuring range for maximum resolution
• Stay safe and prevent damage with overload protection
• Increased durability with double-molded plastic housing

Three-in-One Digital Multimeter (20250-52)

• Three practical instruments in one: multimeter, noncontact voltage detector, and flashlight
• Permanently attached test leads so they don't get lost
• Diode check and continuity test included to check accuracy

Compact Digital Multimeters (20250-50, -51)

• CAT III-600 V designation for safety
• Available in manual ranging version
• Bright backlight display has 1.1" tall digits
• Model 20250-50 offers dedicated battery test function to check the quality of your 9 V and 1.5 V batteries

Industrial Digital Multimeters (20250-53, -54)

• CAT III-600 V and CAT III-1000 V ratings for safety
• IP67 rating for dustproof and waterproof protection
• Flashing red LED alerts you to presence of live voltage
• Model 20250-54 has True RMS for improved reading accuracy and an analog bar graph for viewing trends

Applications

• Electrical
• Industrial
• Laboratory
• HVAC
• R & D

Includes

Test leads (models 20250-50, -51, -52), carrying case (models 20250-50, -51) batteries, and NIST-traceable calibration report with data supplied by InnoCal.

BZ1-R000001101 Radius BZ1 Area Monitor, PID, Pump, UL/CSA, English by Industrial Scientific

When it comes to choosing equipment to protect your worksite from gas hazards, rely on the Radius® BZ1 Area Monitor. No other area monitor protects your workers longer in the field with less setup, user training, and time in the shop.

• Detect up to seven gases using 22 sensor options including PID
• Longest running area monitor with a typical run time of 7 days (168 hours)
• Extended Run Time Power Supply can extend battery to over 1 month
• Ultra-bright blue and red lights and attention-grabbing alarms with distinctive tones
• Audible alarms sound at 108 dB at 1 m to cut through high-noise environments
• Largest display of any area monitor on the market
• Intuitive text-based navigation and configuration
• Customizable alarm action messages such as "EVACUATE" or "VENTILATE"
• LENS™ Wireless enables communication between area monitors and Ventis® Pro5 personal monitors
• All-weather sensor deployment and 360-degree gas path for more accurate detection
• DualSense® Technology increases worker safety by using two sensors to detect the same gas