SuperFlow SF-1020I, Руководство оператора

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6.0 Maintenance
6.3 Flowbench Flow Tests
If the flowbench does not seem to generate the correct flow rates, you can check the bench for problems
using the following tests.
No-flow Test
The no-flow test is basically the same as a leakage test except it checks for leaks in the bench itself.
1. Bolt the test orifice plate onto the baseplate.
2. Place the rubber stopper in the large hole in the test orifice plate, leaving the small hole open.
3. Set the flow range to Range 1 . Refer to section "5.1.4 Setting the Range" on page 17.
4. Set the test pressure to
25 inH20 (60 cm)
. Refer to section "5.1.2 Setting the Test Pressure" on page
16.
5. Set the leakage to 0 (zero) according to the procedure in section "5.1.6 Setting Leakage" on page 18.
6. Switch the motor ON and let the airflow stabilize.
7. Place your finger over the small hole in the test orifice plate.
• The flow reading should settle back to near zero with the flowbench running. This is the normal
leakage of the flowbench itself, and a small amount is acceptable.
• If the leakage exceeds 3 cfm (1.43 lps), record the flow meter reading and try to locate the source
of the leak.
• Perform the test again after a leak is repaired.
•
Low-flow Test
Perform the same test as above, except leave the small hole in the test orifice plate open. Record
the flow reading. It should be approximately 6.8 cfm (3.2 lps).
High-flow Test
The high-flow test checks the accuracy of the flowbench using the Test Orifice Plate .
1. Bolt the test orifice plate onto the baseplate.
2. Set the flowbench to Range 6 . Refer to section "5.1.4 Setting the Range" on page 17.
3. Set the test pressure to 25 inH
2
0 (63.4 cmH
2
O) . Refer to section "5.1.2 Setting the Test Pressure" on
page 16.
4. Set the leakage to 0 (zero) according to the procedure in section "5.1.6 Setting Leakage" on page 18.
5. Switch the motor ON and let the airflow stabilize.
6. Record the flow reading. It should match the value stamped on the test plate (±3 cfm) or be
approximately 240 cfm (160 lps) with both the 1.877” and 0.313” diameter orifices open.