Taking Measurements - Extech Instruments CO230 User Manual

TAKING MEASUREMENTS

The meter starts to measure when powered on and readings update
every second. If the operating environment changes (from high to
low temperature, for example) the meter requires 30 seconds for the
CO sensor and 30 minutes for the RH sensor to stabilize.
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NOTE: Do not obstruct the sensors or hold the meter close to the
mouth or any source of CO
AIR, DP and WBT Temperature
Use the DP/WBT button to step through AIR (air temperature), DP
(dew point temperature) and WBT (wet bulb temperature) shown on
the lower left display.
MIN, MAX, STEL, TWA MODES
In the normal mode, use the Max/AVG button to see the minimum,
maximum, and weighted average readings. Use the Max/AVG button
to step through MIN, MAX, STEL, and TWA modes in sequence and
then back to the normal mode.
In MIN and MAX modes, the meter shows the minimum and
maximum readings of CO
temperatures (lower left display) and Humidity (lower right display).
In STEL and TWA modes, the main display shows the weighted
average of CO
(TWA). The lower display shows the current AIR, DP/WB temperature
and humidity.
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(main display), AIR, DP or WB
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readings for the prior 15 minutes (STEL) or 8 hours
2
when measuring.
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