3M Occupational Health and Environmental Safety Division
3M™ Multi-Gas Detector 740 Series
The 3M™ Multi-Gas Detector 740 Series is designed
for ease-of-use, durability, convenience
and low operating cost.
Rugged
Safety
For the Safety of Your Team in Confined Spaces
Designed
durability
for maximum
3M™ Technology
The 3M™ Multi-Gas Detector 740 Series is designed for ease-of-use,
durability, convenience and low operating cost. It’s the ideal companion
for workers on industrial sites or in confined work spaces – scenarios
where potentially hazardous levels of CO, H2S, O2, or combustible gases
may be found.
Apart from its power to detect up to four gases at a time, the 740
series detector features a bright, readable display, pre-calibrated sensor
replacement packs, and heavy duty construction. Simply put: it’s smart
technology that you can count on to do its job, so you can focus on
doing yours.
The 3M 740 detector offers a quality instrument with a low operating
cost, which is good news for your employees and your business.
Unsurpassed Convenience
The 3M 740 detector makes it easy to replace sensors with a
unique Pre-Calibrated 3M Smart Sensor Pack. Why bother with
individual sensors when you can replace all the sensors with one
convenient insert in minutes?
Built Tough
Tough jobs demand tough equipment. The 3M 740 detector is built
with a rugged circuit board design and a heavy rubberized casing that
helps deliver superior durability and protection against dropping, dust
and liquids.
Safety First
We’ve equipped the 3M 740 detector with a 95 dBA alarm,
dual red LED warning lights and a vibrate mode to get immediate
attention in a busy work environment.
Maximum Endurance
The 3M 740 detector features remarkable staying power with long-lasting
lithium-ion batteries. Now, you can rely on your detector to provide over
eighteen hours of run time. What’s more, you can easily swap in three
3M recommended AAA alkaline batteries on the job if needed.
Great Features and Accessories
All 3M 740 detectors come with standard rechargeable Li-ion battery,
charger adapter, visual, auditory, vibratory alarms, data logging, rugged
alligator clip, infrared port, gas test hood, and instruction manual.
Easy Maintenance
Stay ready with simply the push of a button: over time or with heavy
use, sensors in any gas detector need to be calibrated or replaced.
The 3M 740 detector test mode helps ensure your unit is accurately
measuring the target gas.
The 3M 740 detector sensors are stingy when it comes to using
calibration gas for testing. With a recommended flow rate of 0.2
liters per minute, the 3M 740 detector can help reduce your overall
operating costs.
3M recommends the 740 detector be bump tested or sensor tested
every day before use to help ensure accurate operation.
Long Memory
The 3M 740 detector’s long memory allows you to maintain more than
1000 hours (six months) of data on usage, exposure levels, and other
important site conditions.
3M™ Multi-Gas Detector 740 Series
Power/Select Button
Used for turning the 3M 740 detector ON and OFF,
accessing download menu, silencing alarms and
warnings, and responding “YES” to questions.
Test Button
Used for accessing the sensor test menu and
“up” arrow when changing settings.
Peaks/No Button
Used for accessing Peak menu and “down” arrow
when changing settings and responding
“NO” to questions.
Power Jack
Uses universal 110-240 VAC power supply or
12 Volt Vehicle Wiring Kit.
LCD Readout
Easy to read digital display.
IR Window
Quickly transfers data logging information.
95 dBA Buzzer
Loud audible warning for noisy environments.
Highly Visible Red LEDs
Brilliant red light for visual warnings.
Sensor Opening Filters
Aids against moisture and dust intrusion.
Belt Fastener and Loop
Holds secure to clothing when worn on job sites.
Loop can be used to lower unit into confined spaces.
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Gas Sensor Specifications
H2SO2CO CH4
* Factory calibrated to methane.
Sensor Factory Default
Alarm Level
Display
Range
Reading
Resolution
Factory Default STEL
Alarm Level
Factory Default
TWA Alarm Level
Operating
Temperature Range
Carbon
Monoxide
35 ppm 0 – 1500 ppm 1 ppm 200 ppm 35 ppm -4 to 122 ºF
(-20 to 50 ºC)
Hydrogen
Sulfide
10 ppm 0 – 200 ppm 1 ppm 15 ppm 10 ppm -4 to 122 ºF
(-20 to 50 ºC)
Combustible
Gases*
10% LEL 0 – 100% LEL
0-5% v/v methane
1% LEL Not Applicable Not Applicable -4 to 122 ºF
(-20 to 50 ºC)
Oxygen 19.5% (Low)
23.0% (High)
0 – 25% 0.1% Not Applicable Not Applicable -4 to 122 ºF
(-20 to 50 ºC)
MODEL NUMBER
740-100-400 740 4-gas detector with H2S, OX, CO, EX (calibrated to Methane); alligator clip, rechargeable Li-ion battery, universal power
supply (100-240 VAC), cal gas hood and tubing, comprehensive manual, data manager software CD.
740-100-300 740 3-gas detector with OX, CO, EX (calibrated to Methane); alligator clip, rechargeable Li-ion battery, universal power supply
(100-240 VAC), cal gas hood and tubing, comprehensive manual, data manager software CD.
740-100-350 740 3-gas detector with OX, H2S, EX (calibrated to Methane); alligator clip, rechargeable Li-ion battery, universal power supply
(100-240 VAC), cal gas hood and tubing, comprehensive manual, data manager software CD.
740-100-200 740 2-gas detector with OX, EX (calibrated to Methane); alligator clip, rechargeable Li-ion battery, universal power supply
(100-240 VAC), cal gas hood and tubing, comprehensive manual, data manager software CD.
740-100-100 740 1-gas detector with EX (calibrated to Methane); alligator clip, rechargeable Li-ion battery, universal power supply
(100-240 VAC), cal gas hood and tubing, comprehensive manual, data manager software CD.
740-100-001 740 Gas Detector with alligator clip, rechargeable Li-Ion battery, universal power supply (100-240 VAC), cal gas hood and tubing,
comprehensive manual, data manager software CD. (sensor pack purchased separately)
931-100-400 740 4-gas sensor pack with H2S, OX, CO, EX (calibrated to Methane)
931-100-300 740 3-gas sensor pack CO, OX, EX (calibrated to Methane)
931-100-350 740 3-gas sensor pack with H2S, OX, EX (calibrated to Methane)
931-100-200 740 2-gas sensor pack with OX, EX (calibrated to Methane)
931-100-100 740 1-gas sensor pack with EX (calibrated to Methane)
457-594-000 Cigarette adapter charger
930-030-001 Hand aspirator assembly
671-034-002 Infrared PC Adapter (USB)
671-034-000 Infrared PC Adapter (Serial)
3M™ Multi-Gas Detector 740 Series (1-4 gases)
Please recycle. Printed in U.S.A.
3M is a trademark of 3M.
© 3M 2007. All rights reserved.
70-0714-2881-0 (972) ii
Occupational Health &
Environmental Safety Division
3M Center – Building 235-0W-00
St. Paul, MN 55144-1000
www. 3M.com/detection
Contact Information:
Sales Assistance: 1-800-328-1667
Technical Assistance: 1-800-243-4630
3M Canada
3M Occupational Health and
Environmental Safety Division
PO Box 5757
London, ON Canada N6A 4T1
Contact Information:
Customer Care Centre 1-800-364-3577
Technical Assistance 1-800-267-4414
Internet www.3M.com/ca/occsafety
Standard Features and Accessories
SPECIFICATIONS
Display LCD with designated line for each sensor reading
Battery 3M Standard – rechargeable Li-ion; Optional
– 3M recommended Alkaline (AAA batteries)
Operating Time Up to 18 hours
Readings Peaks, STEL, TWA, Instantaneous Gas Levels
Dimensions 4.8" x 2.7" x 1.4" (122 mm x 69 mm x 36 mm)
Sensors Combustible % LEL (catalytic bead); O2, CO, and
H2S (electrochemical)
Weight 10.4 ounces (292 g)
Alarms/Indicators Dual red LED, audible 95 dBA @ 1 ft., tactile vibrator
SPECIFICATIONS
Operating
Temperature
-4 ºF to 122 ºF (-20 ºC to 50 ºC)
Operating Humidity 15-90% non-condensing
Hazardous Area
Rating
Intrinsically safe – Class 1, Division 1, Groups A,
B, C, and D; T3 C22.2; CSA approval
Data Logging
Memory
1.2 MB (6 months of data at 1 minute intervals
per 40 hours/week)
Ingress Protection IP65
Radio Frequency
Protection
<10% deviation of alarm level when subjected to
450 mHz, 5 watt radio at 2 feet
Warranty 2 years on sensors and hardware
WARNING
This instrument helps monitor for the presence and concentration level of certain specified airborne gases. Misuse may produce an inaccurate reading which means that higher levels of the gas being
monitored may be present and could result in overexposure and cause sickness or death. For instruments with an oxygen sensor installed, misuse may produce an inaccurate reading where lower or
higher levels of oxygen may be present and cause sickness or death.
Each person using this equipment must read and understand the information in the User Instructions before use. Use of this equipment by untrained or unqualified persons, or use that is not in
accordance with the User Instructions, may adversely affect product performance and result in sickness or death. For proper use, see supervisor or User Instructions, or call 3M OH&ESD Technical Service
in the U.S.A. at 1-800-243-4630. In Canada, call at 1-800-267-4414.
