Accutrol Apex Premier, Инструкция по установке, эксплуатации и обслуживанию

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T-APM - Apex Premier F
UME
H
OOD
M
ONITOR
T-APM 0133MAN00015 - Rev J ECN - JUL 2017
Page 15 of 61
Calibration of the APM
Three-Point Calibration Procedure
The Three-Point Calibration Procedure
is intended for “Special Application” fume hoods that are typically
difficult to calibrate using linear calibration techniques. Some examples of these special application
hoods may include large walk-in hoods and custom hoods that have been designed for specific research
or manufacturing applications.
The APM Three-Point calibration routine allows for three discrete face velocity calibration points to be
applied to the internal sensor curve which results in a non-linear correction factor that matches the hood
characteristics.
Step 1: Enable Calibration Mode
With the touch screen enabled and correct password entered, press CAL MENU
,
[SCREEN1]
. Using the
up and down arrows [

or

] select
THREE-POINT CALIBRATION
, [SCREEN 1K] .
Step 2: Move Sash(es) to Full Open (Low Velocity Point)
Following the instructions on the APM
[SCREEN 1N]
, move the sash(es) to the full open position. If the
fume hood has sash stops available, defeat them and open past the stops. Press the screen.
Step 3: Traverse Hood Face at Full Open
Perform a face velocity traverse, with a calibrated instrument, across the open area of the fume hood
face. Once the average face velocity reading is obtained, press the touch screen
[SCREEN 2N] .
Step 4: Enter Traversed Reading
Using the plus and minus signs [ + or - ] on the touch screen
[SCREEN 3N]
, enter the value obtained
in the previous step. Note: By pressing and holding the sign, the number will first change at a slow rate
then at a fast rate automatically. Depressing the RESET button will return the velocity value to the factory
default setting.
Press the
ACCEPT
button when the desired value appears in the velocity box and step a few feet away
from the hood. After a 5-second delay, the APM will acquire 15 data points while displaying the
measured values on the LCD screen
[SCREENS 5K & 6K]
. Observe the display and confirm that the
values are consistent and do NOT vary by more than +/- 5 fpm (0.02 m/s) . If the values are within
limits then proceed to the next step. If the values are unstable, then STOP calibration process and
determine the cause of problem before proceeding.
Step 5: Move Sash a Mid-Open Position (Mid Velocity Point)
Following the instructions on the APM [SCREEN 4N] , move the sash(es) to a mid-open position. This sash
position should be a position indicative of a half opened sash (approximately). Press the screen.
Step 6: Traverse Hood Face at Mid-Open Position (Mid Velocity Point)
Perform a face velocity traverse, with a calibrated instrument, across the open area of the fume hood
face. Once the average face velocity reading is obtained, press the touch screen
[SCREEN 5N] .
Step 7: Enter Traversed Reading (Mid Velocity Point)
Following the same process described in Step 4, enter the second measured face velocity value into the
APM
[SCREEN 6N]
. Press the ACCEPT button when finished.
Step 8: Move Sash(es) to Min. Position (High Velocity Point)
Following the instructions on the APM
[SCREEN 7N]
, move the sash(es) to a minimum position. The
minimum sash position should be a position where the operator can still access the interior of the hood,
NOT a full closed sash positi
on. Typically the opening is approximately 6 to 12” opened (15.2 to 30.5
cm). Again press the screen.