T-APM - Apex Premier F
UME
H
OOD
M
ONITOR
T-APM 0133MAN00015 - Rev J ECN - JUL 2017
Page 13 of 61
Calibration of the APM
Calibration Basics
Because of the wide variation of fume hood types and configurations available, it is
always
necessary to
perform field calibration of the APM.
The purpose of field calibration is to correlate the APM’s internal
velocity sensor with a measured face velocity of the fume hood to which it is installed using a calibrated
instrument.
The APM has three different field calibration routines available; One-Point, Two-Point and Three-Point.
For most fume hood applications, the Two-Point Calibration Routine will provide the best results over the
operating range. The One-Point Calibration Routine is best suited for applications where the face velocity
is constant, such as VAV with no volume limits and no set back. The Three-Point Calibration Routine is
best suited for applications that may exhibit non-linear performance, such as custom walk-in type fume
hoods.
IMPORTANT:
The following items MUST be in place prior to performing APM calibration:
The APM must be
properly installed
, wired and powered up for a period of 20 minutes minimum.
The
room temperature
must be under stable control with the nominal temperature between 68ºF and
72ºF (20ºC and 22.2ºC).
Fume hood
exhaust
and room
supply
must be under stable control, with sufficient fume hood
exhaust static pressure to achieve all design flows.
Proper instrumentation
must be available for measuring face velocity. The instrument used to
measure fume hood face velocity shall be recently calibrated and capable of measuring in the range
between 40 to 400 fpm (0.2 to 2.0 m/s) with an accuracy of +/- 5% of reading.
Average face velocity measurements shall be made in accordance with methods consistent with
ANSI/ASHRAE 110-1995
.
The diagram below illustrates the basic structure of the Calibration Menu Screens. Each of these menu
functions are described in detail on the following pages.
TWO-POINT
CALIBRATION
CONFIGURATION
MENU
CALIBRATION
ADJUSTMENT
ONE-POINT
CALIBRATION
EXIT
THREE-POINT
CALIBRATION
CALIBRATION MENU
SELECT
Summary of Contents for Apex Premier
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