VMS-1655M
LIT-12013297
20
Calibrating the characterization table
The Flow Safe fume hood uses a vortex technology to maintain fume hood safety. A baffle at the rear of the fume hood manipulates the
vortex. The face velocity derives a characterization table that determines the position of the baffle. As each fume hood is different, and
the cfm settings are different, the characterization table may need calibration in the field with its respective hood.
To calibrate the characterization table, complete the following steps:
1. In the FlowSafeHAM window, in the
Hood Characterisation Table
section,
click
Calibrate Table
to view the table calibration dialog.
Figure 25: Hood Characterisation Table
2. In the
Calibrate Table
window, move the sash to the lowest operating height or lowest expected point of use.
At this position, the face velocity is the highest.
3. Wait until the face velocity stabilizes and either click the
Get High Face Velocity
button, or manually enter the tool-reported face
velocity into the
High Face Velocity
text box.
4. When the low sash position is complete, move the sash to the highest operating height or highest expected point of use.
At this position, the face velocity is the lowest.
5. Wait until the face velocity stabilizes and either click the
Get Low Face Velocity
button, or manually enter the tool-reported face
velocity into the
Low Face Velocity
text box.
6. When the
High Face Velocity
and
Low Face Velocity
entries are in place, click the
Update Calibration
button.
The tool computes a new characterization table and sends it to the controller.
During this time, the
Calibrate Table Dialog
is grayed out.
Note:
Make sure that you set the max face velocity as this is also used to generate a table.
Figure 26: Table Calibration options
When the process completes, the
Dialog
re-enables. You can close the Dialog at this time.
