Bacharach Comfort Chek 400 Operation Manual - page 14
Comfort Chek
400 Operation Manual
8
1509-9000 Rev 4
4.4. Data Hold
Press the HOLD button to freeze the current readings. The HOLD icon is indicated at
the top left corner of the LCD. All current readings remain unchanged, except TWA
and STEL. Press the HOLD button again to cancel this function.
Figure 4-5. HOLD Mode
4.5. MIN, MAX, TWA, and STEL
While in normal operating mode, press MNX/AV to see the minimum, maximum, and
time weighted average readings. Each press of this button displays another readings
in sequence and finally returns to the normal operating mode.
In the MIN/MAX modes, the instrument indicates the minimum and maximum
readings for CO
2
on the upper half of the LCD, air/DP/WB temperatures in the lower
left corner of the LCD and RH in the lower right corner of the LCD (Figure a).
In STEL and TWA modes, the main part of the LCD indicates the time weighted
average for readings for CO
2
for the past 15 minutes (STEL) and past 8 hours (TWA).
The lower portions of the LCD are the current AIR, DP/WB temperatures readings and
current RH readings (Figure b).
NOTE: If the instrument is switched on for less than 15 minutes, the STEL value will
be the time weighted average of the readings taken since switch on. The same
calculations apply to the TWA readings indicated prior to 8 hours of operation.
NOTE: It takes at least 5 minutes of recorded readings to calculate the STEL and
TWA. The display indicates “- - - -” (Figure c) during the first 5 minutes of operation
from power on.
NOTE: While all the other readings are held unchanged, the STEL and TWA are
updated every 5 minutes.
(a)
(b)
(c)
Figure 4-6. Statistics Screens