MAHLE RTI NTF-515 (Rev A) User Manual
Page 11
TESTING NITROGEN PURITY
The NTF-515 Purity Tester can be used to determine the percent of nitrogen produced by the NTF-515
by connecting to the Test Port. It can also be used to determine the percent of nitrogen in the air in the
tires after performing a service.
Refer to the Operation Manual for the NTF-515 Purity Tester (035-81169-00) for further details.
Even if you follow this method, you should ALWAYS RECHECK THE TIRE PRESSURE
when purity testing is complete and replenish nitrogen as necessary.
This method is particularly effective at the beginning of the test procedure, when large
changes in nitrogen purity readings quickly occur.
You will notice that the reading continues to climb after the Tester has been removed;
this a function of the response time of the internal sensor. Once the rate of change in the
reading begins to slow down or stabilize, reapply the Tester to the valve stem to obtain
another sample.
When using the Purity Tester to measure nitrogen purity in a tire, you can minimize the
pressure loss, and corresponding refill requirements, by removing the Tester from the
valve stem after a sample has been obtained.
HELPFUL HINT – PURITY TESTING
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