Extech Instruments ez40 Manual Do Utilizador
EZ40 V1.0 05/06
3
Operation
WARNING!
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
Warm-up
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.
may not decrease.
Note: Warm-up time will vary depending on when the last time the meter was used.
Zero
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.
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.
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% LEL
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% LEL
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 leak.
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.