TSI Instruments FHC50 - Page 62

Part Two
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LOM Venturi Calibration
NOTE: LOM Venturi Valves are optional and may not be installed in your system.
1. Obtain the venturi valve minimum and maximum flow, either by reading the label on the
venturi valve or by performing duct traverses when the venturi valve is fully closed and fully
opened.
2. Enter CALIBRATE FLOW item.
3. Set VENTURILOM MIN to the minimum venturi valve flow.
4. Set VENTURILOM MAX to the maximum venturi valve flow.
5. LOM Venturi Calibration can be adjusted using the Flow KFactor item.
6. LOM venturi valve calibration is now complete. Exit the menu.
NOTE: Use BALANCE MODE to verify LOM Venturi calibration.
6Pt Venturi Calibration
NOTE: 6Pt Venturi Valves are optional and may not be installed in your system.
If venturi valve flow data cannot be obtained from venturi valve label,
perform duct traverse with venturi valve at 0%, 20%, 40%, 60%, 80% and
100% open (see item CONTROL_OUT in DIAGNOSTICS menu).
1. Obtain the venturi valve calibration data by reading the label on the venturi valve.
2. Enter CALIBRATE FLOW item.
3. Enter venturi valve minimum flow in item VENTURI PT1.
4. Enter 2nd point flow in item VENTURI PT2.
5. Enter 3rd point flow in item VENTURI PT3.
6. Enter 4th point flow in item VENTURI PT4.
7. Enter 5th point flow in item VENTURI PT5.
8. Enter 6th point flow in item VENTURI PT6.
9. 6pt venturi valve calibration is now complete. Exit the menu.
NOTE: Use BALANCE MODE to verify 6Pt Venturi calibration.
Calculated Flow Calibration
NOTE: Calibrating Calculated Flow requires first calibrating the Face Velocity
using the Sidewall Sensor and calibrating the Sash Pot.
1. Enter CAL SASH AREA menu item.
2. Controller will display current sash position and prompt “Fully close sash then press .”
Close the sash and press the  key. After closing the sash(es) and pressing the , controller
will count down for 5 seconds while it allows control to stabilize.
3. Controller will prompt to “Enter Actual Flow”. Perform a duct traverse or otherwise measure
fume hood exhaust volume and enter it into the controller.
4. Press the ESC key to continue.