TSI Incorporated Q-TRAK Plus 8552, Руководство по эксплуатации и обслуживанию

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Chapter 3 30
Ventilation Rates
Ventilation rates can be measured with the Q-T
RAK
Plus monitor in
terms of % Outside Air. To select one of these options, choose
VENTILATION RATES by using the
!
or
"
key while in the Main
Menu and press the
↵
key.
-VENTILATION RATES-
% OUTSIDE AIR
Figure 3-19: Ventilation Rates Select Screen
% Outside Air
Percentage Outside Air may be calculated by using a temperature-
or CO
2
-based method. Percentage Outside Air is calculated from
the ratio between the differences of the supply air, return air, and
outside air by using the following formula:
( )
OA RA
SA RA
Air Outside
−
× −
=
% 100
%
Where:
RA = PPM of CO
2
or temperature in return air.
SA = PPM of CO
2
or temperature in supply air.
OA = PPM of CO
2
or temperature in outside air.
The following variables must be entered to perform the calculation:
OUTSIDE AIR, SUPPLY AIR, and RETURN AIR. Values for
each variable may be entered manually or by capturing a sample at
the appropriate location.
Calculating the %Outside Air
1. While in the VENTILATION RATES menu, use the
!
or
"
key to scroll and select %OUTSIDE AIR and press
the
↵
key.
2. Select either CO2 or TEMPERATURE using the
!
or
"
key and press the
↵
key. Press the
"
key to continue.