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10.5 Laboratory mode
In laboratory mode, the test is carried out without automatic adjustment of the test pressure and without a time limit .
This mode allows the test to be shortened considerably, and is particularly suitable for taking rough measurements .
10.6 Custom airtightness class
A custom leakage fl ow rate U can be selected in the start screen in addition to the standardised airtightness classifi -
cations . This means the tests can be performed in other applications that use different classifi cations, for example in
power plants .
U only appears when the airtightness classes are selected if the value ≠0 is defi ned .
The standardised air leakage classes are:
A
27 l/s m²
B
9 l/s m²
C
3 l/s m²
D
1 l/s m²
10.7 Differential pressure
In the idle state after it is switched on, the LT 600 can be used as a differential pressure measuring instrument in order
to monitor a pressure curve over time .
The scale is self-scaling, showing a 120 s block that is continuously updated, overwriting the old test curve .
In this mode, you can use the "-" pressure connection (3) if you want to measure the differential pressure between two
test connections rather than using atmospheric pressure . (E .g . for iris diaphragms, fi lter pressure drops, etc .)
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• After the self test, this screen appears .
• You can press the á and â keys to confi gure the pressure and fl ow rate
manually .
• You can change the adapter during the test – turn down the fan, change
the adapter and press the ADPT key to change the setting .
• Press Stop to end the test . Continue as described above .
• Press the ß or à key to move to the letter/digit you want to change .
• You can use the á and â keys to enter a custom leakage fl ow rate .
• Save the value you entered by pressing the à key .
• Alternatively, press the ß key to exit .
• Press the PD = 0 key to reset the display .
• Press the Back key to return to the menu .
• Press the Stop key to end the test . You can then press Print to print the
graph on the TD 600 .
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