AIR VELOCITY:
Mean Value:
Std.Dev.:
HUMIDITY:
Dewpoint:
Vap.Pres.:
Rei. Hum.:
Two pushkeys with LEOs
for
selecting mean air velocity and standard
deviation measurements.
Two
time-averaged
air velocity values are calculated and displayed. A
5 s
exponential average air velocity is shown on the left
of
the Display
and a linear
3-minute
mean value on the right
of
the Display. The
displayed
3-minute
mean value is updated every 1 0 seconds.
A standard deviation
for
each
of
the two mean values is calculated.
Three pushkeys with LEOs
for
selecting dewpoint, vapour pressure and
relative humidity measurements.
Dewpoint is measured with the Humidity Transducer. The dewpoint is
measured every third minute in order
to
conserve battery power and
avoid a continuous
film
of
dew on the mirror. The last measured value
is always displayed.
Vapour pressure is calculated from the latest dewpoint measurement
and is measured in kPa.
The
relative humidity is calculated from the dewpoint and air tempera-
ture measurements.
To
obtain this measurement both the Humidity
Transducer and the
Air
Temperature Transducer must be connected to
the Type 1213.
2.1.3. Mode Controls
Display:
The Type 1213 has three possible operating modes, these are; "Display", "Record" and
"Replay/Plot". A flashing LED indicates that the appropriate push key should be acti-
vated
in
order to continue the desired sequence (e.g. the "Record" sequence).
Fig. 2.3. Mode controls
of
the
Indoor
Climate Analyzer Type 1213
The
"Display" mode is automatically selected whenever the Analyzer is
switched on. Data is displayed when the appropriate transducer push-
key is
selected. The "Display" function can also be used
to
obtain
current data, when the Type 1213 is in the
"Record" mode. If the "Dis-
play"
pushkey is pressed three times in succession while the Type
1213 is in the
"Record" mode, recording
of
data will be terminated.
11
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