User's Manual

975
Users Manual
12
variables are known, the Meter computes the % outside
air.
% Outside Air (Temperature)
To obtain % of outside air using temperature:
1. Place the Meter sensor perpendicular to the air
stream being measured.
2. Press
.The Meter switches to % outside air
measuring mode and offers choices of  [CO
2
] or
 [Temp]
.
3. Press  [Temp]. The Meter measures and
displays the return air temperature.
4. Press  [Capture] to store the return air reading.
The Meter then measures and displays the mixed air
temperature.
5. Press  [Capture] to store the mixed air reading.
The Meter then measures and displays the outside
air temperature.
6. Outside air temperature can either be measured by
using  [Capture] or it can be entered manually
by pressing  [Manual Entry] and entering the
known outside air temperature value. When entering
manually, use  [UP] and  [DOWN] to
change the temperature reading to the desired
number. Press  [ENTER].
7. Once the outside air temperature is entered, return
air, mixed air, and outside air temperatures are
displayed. Press  [Calculate] to show the %
outside air, or press  [Back] to change any of
the measurements.
8. Press  [Done] to end the % outside air
measurement.
% Outside Air (CO
2
)
Measuring the % outside air using carbon dioxide (CO
2
) is
similar to measuring the percentage of outside air via
temperature.
To obtain the % outside air using CO
2
:
1. Place the Meter sensor perpendicular to the air
stream being measured.
2. Press
. The Meter switches to the % outside air
measuring mode and offers the selection choice of
 [CO
2
] or  [Temp]
.
3. Press  [CO
2
]
.
The Meter measures and displays
the return air CO
2
content.
4. Press  [Capture] to store the return air reading.
The meter then measures and displays the mixed air
CO
2
content.
5. Press  [Capture] to store the mixed air reading.
The Meter then measures and displays the outside
air CO
2
content.
6. Outside Air CO
2
content can either be measured by
using  [Capture] or it can be entered manually
by pressing  [Manual Entry] and entering the
known outside CO
2
content. When entering manually,