Labconco Protector Demonstration Hoods 3945021 - Manual (Page 37)

Chapter 6: Maintaining Your Protector Demonstration Hood
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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 in flow 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 Open
(fpm) Range
user defined
(fpm)
Suggested
Set Point
(fpm)
Range
user defined
(fpm)
* Suggested
Set Point
(fpm)
8" Sash
Height
10" Sash
Height
High Calibration
Set Point
or Enclosure
Operating
Inflow Speed
Sash Closed
43 – 53 51 40 – 50 48 27 23 60 fpm
63 – 73 67 60 – 70 64 37 30 80 fpm
83 - 93 83 80 - 90 80 47 37 100 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.