23
Measuring foreign noise (FN)
The ultrasonic test can be affected by foreign
noises. If the mean value of the measured noise
exceeds the preset noise limit, the message
"Foreign noise test" pops up on the display.
In this case proceed as follows:
Measure the sound intensity at various points
upstream and downstream of the test object.
Compare the measured sound intensity with the
mean value of test result.
If the measured sound intensity is below the mean
value, the test was not impaired by foreign noise.
In this case select the item "Foreign noise NO"
in the menu.
For more information on the test results see table
Test Results in Chapter "Performing Tests".
To save the test result in the data collector
touch the "Save"button.
Observe the notes on the test results given in
the table.
If, however, the measured sound intensity is above
the mean value, the test was impaired by the
foreign noise.
In this case select the item "Foreign noise YES"
in the menu.
For more information on the test results see table
'Test Results' in Chapter "Performing Tests".
To save the test result in the data collector
touch the "Save"button.
Observe the notes on the test results given in
the table.
Performing a quick check
In the “Quick Check” menu, you can perform tests
without creating a test object beforehand. This is
useful when valves have been modified or new ones
fitted.
You can repeat a rapid test as often as necessary.
This is a good idea when troubleshooting, for
instance.
The results of a rapid test can also be saved.
Launch the VKP 42 app.
Tap the “Quick Check” button.
Buttons appear for the possible test locations
“Steam tracer”, “Steam line” and “Heat
exchanger”.
Tap the appropriate button for the desired test
location.
Buttons appear for the various types of steam trap.
The following types are possible:
Bimetallic
Membrane (capsule)
Ball-float
Inverted bucket
Thermodynamic
Tap the appropriate button for the type.
The “Working Pressure” menu is shown.
Tap the entry for the required working pressure.
If you do not wish to enter a saturated steam
temperature, tap “Bar ??? (pressure unknown)”.
The working pressure is saved. This working
pressure is displayed the next time you perform a
rapid test.
Perform the test as described on page 18.
To save the test result, tap “Save”.
The storage number is shown on the display. This
will help you find the test results more easily later
on.
Make a note of the storage number.
With the rapid test, you can record a new test
object or one with different properties. In this case,
additional information is required for creating the
test object. If you document this information during
the test, this will ensure more efficient entry of the
test object in the data analysis app.
If necessary, make a note of any other
information required for creating a test object.
Tap “Continue” to end the rapid test and return
to the main menu.
