MAHLE RTI NTF-15 - Manual (Page 8)

Page 6 of 9
TESTING NITROGEN PURITY
The NitroPro Purity Tester can be used to determine the percent of nitrogen produced by the NTF-15
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 NitroPro Purity Tester (035-81169-00) for further details.
Testing Nitrogen Purity
The tester continually releases a small amount of nitrogen from
the tire when it is connected to the valve stem and while it
displays the reading. This is normal.
IMPORTANT - this release of nitrogen will decrease the
pressure in the tire. Therefore, it is important that when testing
is completed that you check the tire pressure and refill as
required to the tire manufacturer’s specification.
Helpful Hint – Purity Testing
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.
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.
This method is particularly effective at the beginning of the test
procedure, when large changes in nitrogen purity readings
quickly occur.
Even if you follow this method, you should ALWAYS RECHECK
THE TIRE PRESSURE when purity testing is complete and
replenish nitrogen as necessary.