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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 ow rate U can be selected in the start screen in addition to the standardised airtightness classi -
cations This means the tests can be performed in other applications that use different classi cations, for example in
power plants
U only appears when the airtightness classes are selected if the value ≠0 is de 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, lter pressure drops, etc )
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• After the self test, this screen appears
• You can press the and keys to con gure the pressure and 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 or key to move to the letter/digit you want to change
• You can use the and keys to enter a custom leakage ow rate
• Save the value you entered by pressing the key
• Alternatively, press the 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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