Factair F4504 Operating Manual page 15

For airline systems less than 40 bar the pressure dewpoint, i.e. the point at which water will begin to
condense into a liquid form in the airline, must be at least 5 degrees centigrade below the lowest
temperature at which the system will be used. The F4504 automatically calculates the pressure
dewpoint from the measured water content and system pressure, it then compares this to the
ambient temperature to determine whether it was a pass or fail.
This test result is automatically recorded in the instrument's memory, which can store up to
20 previous tests. To view these tests return to the main menu and press the "Review Tests" button.
Test results are stored accordingly to the date and time they were completed. From this menu
previous tests can be viewed or deleted as required.
Input the reading from the tube / Impactor and
press the arrow icon in the top right hand corner
of the screen.
The "test complete" screen displays all the
measurements recorded during the test. And
automatically determines whether the test was a
pass or fail against the standard displayed in the
top right corner of the screen. The water content
on low pressure tests is displayed as a pressure
dewpoint. The test result is recorded in the
instrument's memory, which can store up to
20 previous tests.
If the test was a fail an orange exclamation mark
would be indicating those criteria which did not
meet the standard. The photograph opposite is
an example of a failed test where carbon dioxide
failed to meet the requirements of the selected
standard.
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