Met One E-BAM, Руководство по эксплуатации

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E-BAM-9805 Manual Rev B.docx Page 40
5.3.3 Filter Tape Leak Test
Use this procedure to identify a leak at the filter tape interface. The lower and upper system leak
tests in sections 5.3.1 and 5.3.2 above should be performed first.
1. Navigate to the TEST>LEAK TEST menu and raise the nozzle, if needed.
2. Remove all tape from the nozzle area. Remove the size selective inlet(s) or leak test valve
from the sample tube and install a calibration transfer standard (CTS), such as the BX-307
volumetric flow calibrator.
3. Insert the Nozzle Seal Tool with Hole between the nozzle and vane. Note the proper
alignment shown in Figure 5-4. The rubber will guarantee a positive seal at the nozzle/vane
interface, regardless of any debris or imperfections.
4. Press the nozzle control button to lower the nozzle down to the sealing tool.
5. Press pump control button to turn on the pump. Monitor the flow rate on the E-BAM display.
Remember the flow will temporarily rise before it drops.
6.
When the flow rate stabilizes, write down the CTS flow rate value. This is the “Without Tape”
value.
7. Turn off the pump and raise the nozzle.
8. Remove the Nozzle Seal Tool.
9. Place a 3-inch-long piece of filter tape directly below the nozzle and lower the nozzle again.
10. Press pump control button to turn on the pump. Monitor the flow rate on the E-BAM display.
11.
When the flow rate stabilizes, write down the CTS flow rate value. This is the “With Tape”
value.
12. Turn off the pump and raise the nozzle.
13. Remove the strip of filter tape.
14.
Subtract the “Without Tape” value from the “With Tape” value using the folloing equation:
WithoutTape
– WithTape = LeakRate
The result should be a positive value of 0.3 LPM or less. A typical example might look like
this: 16.71 LPM
– 16.58 LPM = 0.13 LPM
a. If the difference is 0.3 LPM, or less, the leak test passes. Record the results (as
needed), remove all test equipment, and resume normal sampling operations.
b. If the difference is greater than 0.3 lpm (liters per minute) a leak exists at the nozzle /
tape interface. Thoroughly clean the nozzle and vane area as directed in section 5.5
and then repeat steps 3 through 14 until the leak is corrected. If this test still fails after
a few tries, contact the Met One Instruments, Inc. service department (see section
1.2) for assistance.
15. Once the leak has been resolved, remove the CTS and replace the size selective inlets on
the sample tube. Reinstall the tape and resume normal sampling operations.