User's Guide
EzFlex™ Combustible Gas Leak Detector
Model EZ40
Congratulations on your purchase of the Extech EZ40 Combustible Gas Leak Detector. The EZ40
detects the presence of combustible gas and nuisance vapors (Natural Gas, Methane, Ethane,
Propane, Butane, Acetone, Alcohol, Ammonia, Steam, Gasoline, Jet Fuel, Hydrogen Sulfide,
Smoke, Industrial Solvents, Lacquer Thinner, Naphtha) in concentrations as low as 10% LEL for
Methane and alerts the user with audible and visual alarms. The 16” (406mm) flexible gooseneck
provides easy access in difficult to reach locations. This meter is shipped fully tested and
calibrated and with proper use will provide years of reliable service.
Probe clip
Sensor tip guard & sensor
Alarm light
Ready light (Power-on)
On/Off slide switch
Earphone jack
Tick rate (sensitivity) adjustment
Note: Battery compartment is on rear of unit
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Always turn the meter on in an atmosphere free of combustible gas.
Read and understand this manual before using the meter.
Do not replace the batteries in an explosive atmosphere.
Frequently check meter operation using an unlit gas burner or lighter
1. In a gas free atmosphere, slide the ON/OFF switch to the right to power on the detector.
2. Hold the EZ40 in the clean ambient air during its 5 minute (typical) warm-up, self-zero cycle.
3. Some intermittent ticking and warbling alarm tones may be experienced for a short time as the
meter warms up.
4. The alarm will slowly decrease and a steady ticking rate will indicate that the EZ40 ready for
use. If the meter is in an area where combustible gas is present, the alarm may not decrease.
Note: Warm-up time will vary depending on when the last time the meter was used.
The EZ40 will automatically zero itself on activation. If the sensor was overexposed, the EZ40 will
enter into an automatic cycle to reset. In this instance, the unit will alarm at peak level and decrease
to zero.
Earphone Jack
In an area with high levels of background noise, an earphone can be plugged in to the EZ40. In
addition, the speaker is disabled when an earphone is connected so the ticking and alarm will not
disturb others in the general area.
Caution: Tick and alarm sounds through the earphone are very loud.
% LEL, a definition:
The LEL of a flammable gas is the minimum concentration of that gas, at normal ambient
conditions, at which it will burn if there is a source of ignition present. At a concentration below the
LEL, the gas will not burn. Gas detectors for flammable gases are calibrated in the range 0-100%
Leak Detection
1. Adjust the sensitivity to establish a slow constant tick rate
2. Trace the sensor around the source of the suspected leak. When leaking gas is detected the
tick rate will increase.
3. If the level of gas is approximately at 10% LEL of Methane, the Alarm LED will blink and the
warbling tone will increase in pitch with increasing gas concentration.
4. In areas of high gas concentration, the tick rate can be readjusted to pinpoint the location of the
5. Turn the sensitivity dial counterclockwise to reset the tick to a lower rate.
6. The tick will increase as you get closer to the source of the leak.
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Caution! Storing in a damp environment will damage the sensor!
Battery Replacement
If the green READY LED flashes or does not illuminate, the batteries need to be
replaced. The battery compartment is located at the rear of the EZ40. Replace the
three “C” batteries by sliding the battery compartment door and accessing the battery
compartment. Ensure that the compartment cover is securely fastened when finished.
You, as the end user, are legally bound (EU Battery ordinance) to return
all used batteries, disposal in the household garbage is prohibited! You
can hand over your used batteries / accumulators at collection points in
your community or wherever batteries / accumulators are sold!
Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the
end of its lifecycle
Cleaning and Storage
Wipe the meter only with a damp cloth as needed. Do not apply abrasive, solvents, or other
cleaners to the surface of the meter or sensor. Store with the batteries removed and avoid extreme
temperature and humidity.
Gases Detected
Natural Gas, Methane, Ethane, Propane, Butane, Acetone, Alcohol,
Ammonia, Gasoline, Jet Fuel, Hydrogen Sulfide, Smoke, Industrial
Solvents, Lacquer Thinner, Naphtha,
Carbon Monoxide (indication only, not to quantify),
50 ppm methane
Solid State
Visual and Audible at minimum 10% LEL (40% max) for Methane
Approx. 5 minute
Response Time
Less than 2 seconds (up to 40% LEL)
Duty Cycle
Power supply
3 x “C” 1.5V alkaline batteries
Battery life
Approx. 8 hours continuous use typical
Operating Temperature
0 to 50 C (32 to 122 F)
Storage Temperature
-30 to 60 C (-22 to 140 F)
Operating Humidity
10 to 90% RH (non condensing)
221 x 72 x 46mm (8.7 x 2.83 x 1.8”); gooseneck 40cm (16”)
520g (18.4oz)
Copyright © 2013 FLIR Systems, Inc. All rights reserved including the right of reproduction in whole or in part in any form ISO‐9001 Certified www.extech.com 4
EZ40-EU-EN v1.2 08/13
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