PQWT L4000 Manual

Important to know before detection leakage.
1. First, determine the pipeline location and direction.
2. Second, make sure there is no large and continuous environment noise around.
3. The drop leaking is not good detection or should keep the pipeline pressure 6Pa at
least.
4. Detection the exposed pipes and valve wells around.
5. The control handle switch on the cable, press down is turn on. Press again is
turn off. The detection should keep the handle switch ON
6. The detection Spectrum analysis/Filtering Analysis can't save into instrument, you
can take the picture for saving. Only the Live recording of leaking sound can record to
repeat listening after measurement.
Assembly equipment
1. The headset connects to host machine. Turn on the button like" " of headset.
2. The sensor connects to the instrument, and cable connection to the host machine
too, if it is soft soil area, the connection of the three listening stick inserted into the
bottom of the sensor. Insert the listening stick to deep soft soil.
3. Use the belt when measurement, to avoid the damage and fall
1. Spectrum Analysis steps are as follows
(Spectrum Analysis is the rough test, After locking the small leakage area like 2 meter,
Use the Filtering Analysis to find the leakage point)
Open the power switch, double-click into the "Spectrum Analysis", the "volume"
adjusted to between 15-35, to hear the sound is appropriate; The "gain" adjusted to
between 10-15, or the sound will be distorted if raising.
Connecting the headset, turn on the headset power switch, turn on the noise control
button of the headset. Putting the sensor in the direction of the pipe or the valve in the
well, Press down the cable's handle switch(which is a small button on the cable),
through the sound to determine the size of the vibration intensity, The pipe near the
water leakage point or the vibration of the valve well is large sound, with continuous
"ZI CI SI", Focus on the low-frequency spectrum of 3, 4, and 5 (from left to right) and
keep an eye for small areas of water leakage spectrum is raising. This area is
suspected leakage point of the spectrum is specially high/strong. After locking a small
area of the leakage area for filtering analysis.