Chapter 6: Maintaining Your Enclosure
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9.
Be sure to enter “DONE” after successfully completing the low and high
calibration set points.
10.
Once calibration is completed, go to “RUN” and hit “ENTER”. The value
should read close to the high calibration set point.
11.
To lower the face velocity to the operating point, simply alter the exhaust
volume with the speed control on the FilterMate or exhaust damper. Then
recheck the face velocity with an anemometer to confirm the display on the
digital airflow monitor.
Digital 1000 Alternate Calibration Procedure -
Constant Volume Conditions
1.
To successfully calibrate, it will be necessary to change the face velocity by
opening and closing the enclosure’s sash. The airflow monitor is factory set
to be calibrated with a difference of at least 50 fpm and can be changed by
adjusting the “lower/higher air sample difference.” The inflow face
velocity speeds provided in the chart below are suggested to successfully
calibrate the Digital 1000.
2.
Before proceeding with calibration, it will first be necessary to configure
the airflow monitor. Go to the setup and then CAL CONFIG MENU and
adjust the “lower/higher air sample difference” to 10 fpm. This will allow
you to successfully calibrate with minimum difference values of 10 fpm.
3.
While in CAL CONFIG MENU, change the “sensor difference” from 10%
to 3%.
4.
While in CAL CONFIG MENU, adjust the red low alarm to the desired
setting (See the chart below for range and suggested settings). Then adjust
the yellow “CAUTION or WARNING” to the desired setting (See the chart
below for range and suggested settings). Then adjust the “CAUTION or
WARNING” air reset to 3 fpm. This sets the alarm condition.
CAUTION WARNING
“YELLOW LED” Setting
LOW ALARM
“RED LED”
Setting
Low Calibration
Set Point
Sash Normal
(fpm)
High Calibration
Set Point
or Enclosure
Operating
Inflow Speed
Sash Blocked ¾
Range
user defined
(fpm)
Suggested
Set Point
(fpm)
Range
user defined
(fpm)
*
Suggested
Set Point
(fpm)
8" Sash
Height
10" Sash
Height
43 – 53
51
40 – 50
48
60
60
120-150 fpm
63 – 73
67
60 – 70
64
80
80
160-200 fpm
83 - 93
83
80 - 90
80
100
100
200-250 fpm
*
Because of airflow fluctuations in a typical laboratory environment Labconco suggests
setting the “RED LED” low alarm set point to 20% below the enclosure’s operating speed.
