Disposal:
Follow the valid legal stipulations in respect of the disposal of the device at
the
end of its lifecycle
Operation
POWER ON/OFF
Press
SET
to turn the meter on and off. At power up, the meter emits a short beep and performs a
30 second countdown for meter warm up. It then enters the normal operation mode with current
CO
2
, temperature and humidity readings displayed.
CO
2
O
%
TAKING MEASUREMENT
The meter starts measurements when powered on and updates readings every second. If the
operating environment changes (ex. from high to low temp.), it takes 30 seconds for CO
2
sensor to
respond and 30 minutes for RH.
NOTE: Do not hold the meter close to your mouth or any other source of CO
2
.
AIR, DP and WBT Measurements
Press the
DP/WBT
button to switch temperatures display. The lower left display will cycle from
“AIR” air temperature, “DP” dew point temperature and “WBT” wet bulb temperature.
DATA HOLD
Press the
HOLD
button to freeze the readings, the "HOLD” icon is displayed on the left top of the
display. All current readings are held unchanged, except STEL and TWA. Press “HOLD” again to
cancel the hold function.
BACKLIGHT
Press the
MODE/
▲
button for more than 1 second to activate or to cancel backlight function.
MIN,MAX,STEL,TWA
In the normal mode, press the
Max/AV
button to see the minimum, maximum, and weighted
average readings. With each press of the
Max/AV
button, the meter displays MIN, MAX,
STEL, TWA in sequence and then returns to the normal mode.
In MIN and MAX modes, the meter shows the minimum and maximum readings of CO
2
(main
display), AIR, DP or WB temperatures (lower left display) and Humidity (lower right display).
In STEL and TWA modes, the main display shows the weighted average of CO
2
readings for the
past 15 minutes (STEL) or 8 hours (TWA). The lower displays are the current measurements
STELCO
2
O
%
NOTE:
8.
If the meter has been powered on for less than 15 minutes, the STEL value will be the
weighted average of readings taken since power on. As well, the TWA
mode will display a weighted average of readings prior to 8 hours of
operation.
9.
The GSM400 takes at least 5 minutes to calculate STEL and TWA. The
display shows “----”
during the first 5 minutes from power on.
