Operation; Min/Max Mode; Alarm Function - Extech Instruments CO200 User Manual

Operation

Powering the CO200
Plug the supplied power adaptor (5V/0.5A) into the power jack on the back of the meter
(ensure that you connect to the power jack on the left, not the alarm relay jack on the right;
see diagram in the Alarm Relay section below).
Now connect the power adaptor to an AC power source, the meter will switch ON, the front
panel LED power indicator will light, and the beeper will sound. If the power source voltage
is incorrect, "bAt" will display and the LED indicator will flash. Do not use the CO200 with an
incorrect power source.
In normal operation the LCD will display CO
quality level is also displayed (GOOD, NORMAL, POOR).
Measurements
The meter starts measuring as soon as it is powered and updates readings once per second. If the
operating environment changes (from high to low temperature, for example), it will require 2 minutes
for the CO sensor to respond and 10 minutes for the Relative Humidity sensor to respond.
2
Note: Do not hold the meter close to your mouth or any other source of CO

MIN/MAX Mode

In the normal mode, press the MIN/MAX button to see the minimum or the maximum CO
Temperature, and Humidity values. Each press of the MIN/MAX button steps through the MIN, the
MAX, and then the normal display mode.
Long press the RESET button to clear the minimum and maximum values from memory.

Alarm Function

The CO200 features an audible (beeper) and visual (flashing fan icon) alarm that warn when the
concentration exceeds the programmed threshold. There are two alarm thresholds, the 'POOR'
CO
2
air quality threshold (that triggers the alarm), and the 'NORMAL' air quality threshold (that cancels
the alarm). See the Setup mode to set these threshold settings.
The alarm output relay switches on and off as the CO
The audible alarm can be manually silenced by pressing any key, or it will automatically stop when
the CO reading is no longer in the alarm region (the user can subsequently press and hold the
2
RESET button to re-activate the alarm, if desired).
If the beeper is manually silenced, it will sound again when readings
move out of, and then back into, the alarm region.
The fan icon continues to flash even when the beeper is manually
silenced. It disappears only when readings are no longer in the alarm
region.
, temperature, humidity, date, and time. The air
2
alarm switches on and off (see next section).
2
3
.
2
,
2
CO200-en-US v1.3 1/21