Amprobe CO2-200 CO2-Meter - Manual (Page 10)

4
OPERATION
1. Plug in the adaptor and the meter turns on
automatically with a short beep. It performs
30 seconds countdown (Fig.1) for meter warm
up, then enters normal mode with current CO2,
temperature, and humidity readings displayed.
2. The meter starts taking measurements when
power on and updates readings every second. In
the condition of operating environment change
(ex. from high to low temp.), it takes 30 sec to
respond for CO2 sensor and 30 minutes for RH.
3. Press “p/DP/WB” to switch temperatures
display. The lower left display will cycle from air
temperature, dew point temp., and wet bulb
temp. (Fig. 2)
4. Press “MNX/AVG/q” to see the minimum,
maximum, and weighted average readings.
Each press of it displays MIN, MAX, STEL, TWA in
sequence and returns to normal mode. In MIN and
MAX modes, it shows the minimum and maximum
readings of CO2 on main display, and of AIR/DP/
WBT temperatures and humidity on the lower
displays. In STEL and TWA modes, the main display
shows the weighted average of CO2 readings for
the past 15 minutes (STEL) and 8 hours(TWA), but
the lower displays are the current AIR, DP/WB
temperatures and humidity readings.
NOTE:
• If the meter is turned on for shorter than 15
minutes, the STEL value will be the weighted
average of readings taken since power on. Same
for TWA values appear before 8 hours.
• It takes at least 5 minutes to calculate STEL and
TWA. The display shows “----” during the first 5
minutes from power on (Fig. 3).