Revision 1 42 9/10/2019
d) Check the pressure indicated on the gauge. If the pressure reads 4 or above, as shown
in Figure 3-21, the tape is well sealed against the sample chamber by the compression
head. Press Tape Advance on the keypad and ensure that the pressure does not drop
below 3 even when the tape is moving. It should return to 4 by the time the tape stops
moving.
If the pressure is NOT 4 or greater, there is a problem with the seal somewhere in the
chassis.
3.6.3 Connecting the Power Eductor
The power eductor (see Section 2.7.4) is normally driven by the sample stream through the
sample regulator set at 15 psig. Instrument air or plant nitrogen could also be used.
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