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Ultrasonic & Megasonic cavitation Meter
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The Ultrasonic/Megasonic Cavitation Meters (0 to 5 MHz) are precise instruments for measuring ultrasonic/megasonic
and cavitation energy density, as well as the ultrasonic/megasonic frequency.
The systems measure energy density at a given point in time and space in
a single fixed direction in the tank. The ultrasonic/megasonic cavitation meters are simple and easy
to use yet contain sophisticated electronics for data storage, retrieval
and analysis. Readings are processed 1.5 times per second for fast accurate
display on the front panel LCD.
In "auto mode" the unit will gather statistical parameters
including average, standard deviation, minimum and maximum readings. This allows you to establish several strategies to characterize a tank. Data collection
strategies include:
• Measuring energy variations at a given point in
the tank as a function of time.
• Mapping a tank by ‘walking’ the probe at a fixed
depth under the surface of the tank. See an example below "Mapping Energy".
• Comparing average energy from tank to tank, over
the life of a tank, or unloaded versus loaded with parts to be cleaned.
| Specifications |
| Energy
Range |
0 to
255 w/in2 (w/gal*) |
| Energy Accuracy |
±0.2% w/in2
(w/gal) |
| Energy Display Resolution |
1.0 w/in2 (w/gal) |
| Frequency Range |
0 to 5 MHz (2000
kHz) |
| Frequency Accuracy |
±1.0 kHz |
| Freq. Display Resolution |
0.1 kHz |
| Display |
Custom LCD |
| Memory |
100 sets: loc.,
date, time, avg., max,min, DT, freq. |
| Output |
Computer or Serial
printer interface
(9600, 8,1, n, p) |
| Input |
Standard 7.2-volt
battery charger, Probe |
| Case Materials |
Aluminum with polyurethane
baked enamel paint |
| Probe
Materials |
Contact an Imtec Representative for details. |
| Operating Temperatures |
1° to
100° C (33° to 392° F) |
| Power |
One 7.2-volt sealed
Ni-MH rechargeable battery |
| Weight |
2 lb. Complete |
| Case Dimension |
4" W x 8" L x 2"
H |
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Objective:
To profile the cavitation energy at an
horizontal plane in a DI water tank.
Procedure:
An ultrasonic probe is walked in the horizontal
XY plane at half the distance between the surface of the water and the
ultrasonic transducer. Data is collected at each X,Y coordinate for
10 seconds and the 10-second average is recorded.
Method:
A tank measuring 13.5” long, by 9.5” wide,
by 10” deep is used. This tank contains 5.85 gallons of DI water
sonicated by a 40 kHz ultrasonic transducer rated at 500 watts.
The transducer is 9” long, by 6.5” wide,
by 3” deep. The 316 stainless steel box contains actually 5 transducers
inside it operating at about 100 watts each.
The tank is filled with 5.85 gallons of
de-ionized water and sonicated for 30 minutes for de-gassing. The
water temperature is recorded at 20° centigrade throughout the experiment.
The water depth is 6.7”. The surface of the probe is kept parallel
to the bottom of the tank at 3.7” from the top lip of the tank.
Setting the cavitation meter in AUTO mode, the probe
is located at one corner of the tank and run for 10 seconds. The
probe is then re-located 0.5” away from its previous position in order
to walk it along the X (longitudinal) axis at a fixed Y (latitude).
This procedure is repeated until 560 data points have been obtained.
The data is down-loaded 100 data points
at a time to a PC using excel format.
Results:
The data shows that there is an uneven
distribution of cavitation energy at the half-height of the DI tank.
There are 4 minima, one at each corner of the tank at about 6 watts per
gallon. There are 4 peaks, one on top of each transducer at about
200 watts per gallon.
The average energy at this plane is 78
watts per gallon.
Discussion:
This method of profiling cavitation in
a tank can be useful in establishing the variations in energy density.
It is also useful to obtain the average cavitation energy of the tank.
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