9
9
For example: To change the units of measurement
from feet per minute (fpm) to meters per second
(m/s):
Push the
UNIT
key until [
] appears.
Push
↑
until the display annunciator
c
moves
to m/s, selecting meters per second.
Push
↵
to select the measurement unit.
To Hold a Reading (For storage or printing):
Push the
HOLD
key briefly until the measured
value flashes.
Push
HOLD
again to
STORE
this reading to
memory, or push
ON/OFF
to reject it and return
to
RUN
mode.
Measurement Modes
You can set the AXD 550 for pressure, velocity, or
volume measurement by pressing the
UNIT
key.
Pressure Selection:
The AXD 550 is a pressure measuring instrument.
Its factory default setting is to measure pressure in
inches of water (in. H
2
O) or pascals (Pa).
Velocity Selection:
Air velocity measurement can be accomplished
using a Pitot probe.
The following equations are used for pressure to
velocity conversions:
Pressure in inches H
2
O Velocity = 4005
+
U
P
(inches H
2
O) in feet/min
Pressure in Pascals
Velocity = 1.29
+
U
P
(Pa) in meters/second
The velocity calculations assume standard
conditions. Use the cF menu option to adjust the
velocity or volume readings. (See Appendix E for
air density correction factors and Appendix D for
pressure to velocity conversion charts.)
Volume Selection (or reviewing the latest
area):
Air volume measurement is achieved by
multiplying a velocity reading by an area.
When you press the
VOL
key, the [
]
menu appears on the display and provides a way
to choose whether you are measuring by area (in
square units) or by a round or rectangular cross-
section.
Make your selection by scrolling using the
↑
and
↓
keys, then pressing the
↵
key to accept your
choice.
If you choose to use a cross-section, you must
then indicate dimensions as follows.
Area (review or select new value):
When selected, [
] flashes the current
units ft
2
[
] or m
2
[
].
The display will then show the last area value
selected in ft
2
or m
2
.
Modify these values by using the
↑
and
↓
keys
to change the volume, pressing the
↵
key to
accept the value.
Rectangular:
After [
] is selected, the units of linear
distance will be flashed briefly in inches or
meters.
The display will then show starting X dimension
values [
] in inches or [
] meters.
Accepting the X value affects choice of a
volume dimension (e.g., cfm).
Change these values using
↑
or
↓
. Press the
↵
key to accept.
The next display shows desired Y dimension
values of [
] in inches or [
] meters.
Change these values using
↑
or
↓
. Press the
↵
key to accept.
Press the
↑
or
↓
key until the desired value is
reached, then press
↵
to accept.
Round:
The display will show starting point diameter
values [
] in inches or [
] meters.
Change the value to the necessary diameter
using
↑
or
↓
. Press the
↵
key to accept.
Содержание ALNOR MicroManometer AXD 550
Страница 1: ...AXD 550 MicroManometer OWNER S MANUAL...
