Taking Measurements; Temperature, Relative Humidity, Co, Co , Dew Point, And Wet Bulb Measurements; Outside Air - Fluke 975 AirMeter User Manual

Press 1 and 2 as necessary to change the
4.
item values. Hold down 1 or 2 to increase
the rate of change.
Press 3[Select], or in some cases [Done], to store
5.
the changes.
Press S for 2 seconds to exit the Setup menu. All
6.
changes are stored.

Taking Measurements

The Meter measures:
Temperature, Dew Point, and Wet Bulb
Relative Humidity (%RH)
Carbon monoxide (CO) levels
Carbon dioxide (CO ) levels
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% Outside Air

Air Velocity (standard and actual)
Flow Rate
Temperature, Relative Humidity, CO, CO
Point, and Wet Bulb Measurements
When the Meter completes and passes its self-test, it is
ready to take temperature, relative humidity, CO, CO
dew point, and wet bulb readings. If the Meter is
displaying another function menu, press
Temperature, relative humidity, CO, and CO
shown on this screen.
Dew point is the temperature at which condensation
starts. To view the dew point from the main menu,
, Dew
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,
2
T
.
readings are
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press 1[Dew Point]. The dew point reading
appears on the top right of the display.
Wet bulb temperature is the lowest temperature that
evaporating water can reach. To view the wet bulb
temperature from the main menu, press 3[Wet
Bulb] (or 1[Wet Bulb] if the Meter is displaying dew
point temperature). The wet bulb reading appears on
the top right of the display.
From either the wet bulb or dew point screens, press
3[Main] to return to the main screen.
% Outside Air
Air conditioning systems rely on outside air, mixed air,
and return air to help cool, heat, or purify their output. A
balance of the three is also a factor in achieving optimum-
energy usage from the conditioning unit.
The Meter's Percentage (%) Outside Air function
computes the percentage of outside air two different
ways, either by measuring temperature or by measuring
CO content.
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The formula for calculating % outside air is:
% Outside Air = (Return Air – Mixed Air) x 100 %
Return Air – Outside Air
Determining the % outside air requires entering values for
return air, outside air, and mixed air into the formula.
These values can be in temperature or CO
values can be measured with the Meter or, in the case of
outside air, can also be entered manually. Once the
TM
AirMeter Test Tool
Taking Measurements
content. The
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