Accutrol Apex Premier, Installation, Operation & Maintenance Manual, Page: 18 / 61

T-APM - Apex Premier F
UME
H
OOD
M
ONITOR
T-APM 0133MAN00015 - Rev J ECN - JUL 2017
Page 18 of 61
Calibration of the APM
Manual Calibration Adjustments
An interesting feature of the APM is a Manual Calibration Function which allows adjustment of the original
calibration point(s) obtained during the one-point or two-point calibration routines.
NOTE: This feature is
not intended to replace the initial calibration process that is required upon initial installation and
start-up.
This function can be desirable if, for example, during a periodic hood validation, the calibration
at a high velocity is reading 6 FPM higher than the traverse. By using the manual calibration adjustment,
the high flow calibration set point can be manually offset to a value of -6 FPM to correct the error and
display the expected results. The manual calibration feature allows adjustment of the displayed readings
WITHOUT performing a full calibration routine. This function can be a real time saver during periodic
hood validation. The APM will automatically choose whether the technician can adjust one point (for a
one point calibration routine) or two points (for a two point calibration routine), this feature is not available
for a 3 point calibration.
➢
Manual Calibration Adjustment for One-Point Calibration Routine
Step 1a: Enable Calibration Adjustment Mode
With the touch screen enabled and correct password entered, press CAL MENU
,
[SCREEN 1]
or
[SCREEN
1G] . Using the up and down arrows [

or

] select
CALIBRATION ADJUSTMENT
and press it,
[SCREEN 1K]
.
Step 2a: Enter in Desired Offset Value
Assuming a one point calibration was previously completed, the APM will prompt for an offset value
[SCREEN 19K]
. This value will be added (or subtracted when a negative number is entered) to the
calibration point obtained when the calibration was originally performed. Using the plus and minus
buttons [

or

] enter a positive or negative offset value and press ACCEPT .
Step 3a: Verify New Reading
The next displayed screen, [SCREEN 18K] , will show a face velocity reading for the given position of the
sash at that moment. It is a live reading and varying the sash position will vary the reading as expected.
If the new readings are correct as displayed, press
ACCEPT
, if not, press
RETRY
to try again or
CANCEL
to quit.
➢
Manual Calibration Adjustment for Two-Point Calibration Routine
Step 1b: Enable Calibration Adjustment Mode
With the touch screen enabled and correct password entered, press CAL MENU
,
[SCREEN 1]
or
[SCREEN
1G] . Using the up and down arrows [

or

] select
CALIBRATION ADJUSTMENT
and press it,
[SCREEN 1K]
.
Step 2b: Select Calibration Point to Adjust
Assuming a two point calibration was previously performed, the APM will prompt for which calibration
point to adjust
[SCREEN 15K] . Select
HIGH VEL. CAL POINT
to adjust the value obtained when the sash
was at a minimum position, select
LOW VEL. CAL POINT
to adjust the value obtained when the sash was
at a full open position, or select
EXIT
to cancel out of this section.
Step 3b: High Velocity Calibration Point Adjustment
After selecting HIGH VEL. CAL POINT , the APM will ask for an offset value to move the calibration point
by
[SCREEN 16K]
. This value will be added (or subtracted when a negative number is entered) to the
calibration point obtained when the two point calibration was originally performed. Using the plus and
minus buttons [

or

] enter a positive or negative offset value and press
ACCEPT
.