Air-Vac DRS27, User Manual, Page: 69 / 384

DRS27 User’s Guide Chapter 3: Machine Function Verifications
0027.00.902 3-7
3.3 Flow Rate Verification and Adjustment
Once the pressure verification is complete, the gas flow rate should be verified. Accurate gas flow through
the nozzle is critical for achieving repeatable results. The DRS27 incorporates a Mass Flow Controller
with closed loop control to monitor and regulate gas flow rates.
The two areas of flow verification include the Nozzle Flow Controller, which controls actual flow rates and
the Nozzle Flow Sensor, which controls the Computer Digital Flow Display. Nozzle flow verification is
required for initial installation, or any time the machine is disconnected and/or moved.
3.3.1 Nozzle Flow Controller Verification and Adjustment
Materials required:
•
Scribed reference flow meter supplied with the machine.
Initial conditions:
•
Pressure to upper heater must be set precisely to 80 psi (+/- .5psi).
Set-up:
•
Connect the Black Hose from the Flow Meter into the Flow Cal Fitting.
WARNING:
B
E CERTAIN ALL THE BLACK HOSE
IS INSERTED INTO FITTINGS
COMPLETELY
. A
BAD
CONNECTION CAN RESULT
IN ERRONEOUS CALIBRATION
READINGS
.