Tisch Environmental PUF+, Руководство оператора

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PUF+ Operator’s Manual Tisch Environmental
14
Step by Step: Auto Calibrating the Flow
The following steps provide instructions for using the Auto Calibrate feature for flow
calibration. The system comes calibrated from the factory, but the flow rate should always
be calibrated anytime the system has been moved.
1. The unit should be powered on for a minimum of 30 minutes before performing
any calibration.
2. Remove any sample media from the glass sample holder and filter holder and
install the TE-5040A PUF calibrator onto top of module by tightening the three
wing nuts. The glass media holder must be installed for the sytem to seal
properly.
3. Connect the 4’ piece of tubing from calibrator to Auto Cal port on bottom of
PUF+ control unit left of yellow thermo coupler wire (first pressure tap)
4. From the Main Status Screen, press “F3” key to enter the SETUP menu.
5. Scroll using the arrow keys and select the CALIBRATE menu item and press the
“ENT” key.
6. Select “Qstd” and press the “ENT” key. This will enter the Qstd calibration
screen. Note: Qstd calibration is always done even if operating the unit at FLOW
TYPE: AMBIENT.
7. From the Qstd calibration screen, press the “F1” key to add calibration data and
begin the calibration process.
8. Select “YES” to the Auto Calibrate question and press the “ENT” key.
9. The system will prompt for the standard m value for the calibrator. Enter the Qstd
slope (m) from the TE-5040A orifice transfer calibration worksheet for the
attached calibration orifice.
10. The system will prompt for the standard b value for the calibrator. Enter the Qstd
intercept (m) from the TE-5040A orifice transfer calibration worksheet for the
attached calibration orifice.
11. The system will prompt for the starting pressure at which to begin calibration.
This is the differential pressure (in inH20) the system will maintain across the
Venturi orifice during the first calibration point. On older manual systems this
was measured by the Magnehelic Gage. The typical starting value of 70 is
automatically provided. Press the “ENT” key to accept this value and continue.
If a different starting point is required per the SOP, enter that value and press the
“ENT” key to continue.
12. The motor will now turn on and the system will control the motor speed to
maintain the pressure across the Venturi at the desired starting point.
13. The system will monitor the data being collected and collect a data point once it
detects the flow at that operating point is stable.
14. The system will then subtract 10 inH20 from the current operating point and
collect another data point. This will continue until 5 data points have been
collected. This procedure typically takes about 5 minutes, but can take longer
especially under winding conditions that can cause the pressure sensor to be
noisy.