Specifications

PCA
®
3
12
During a test, the CO
Low
sensor is protected from high CO levels by being
automatically fl ushed with fresh air when the detected CO level exceeds
4,000 ppm. The analyzer will automatically start using its optional CO
High
sensor, if installed, at CO levels starting at 4,001 ppm, thus providing
continuous CO readings up to 20,000 ppm.
A keypad backlight enables a user to read the keypad in dimly-lit areas.
Turn the keypad backlight ON and OFF by briefl y pressing the I/O
button.
The analyzer is turned OFF by pressing and holding down the I/O
button for at least 2 seconds. Note that there is a 5-second delay before
the analyzer actually turns OFF, during which time the analyzer can be
turned back ON by pressing the RUN/HOLD button. In addition, there
is a gas-purge feature that keeps the analyzer’s pump running if the gas
level inside the sensor chambers is abnormally high at shutdown. With
the probe removed from the stack and sampling fresh air, the analyzer
purges itself until the detected gas concentrations drop below predeter-
mined levels.
1.6 Connector Descriptions
1.6.1 Probe Connections (Gas, Pressure, T-Stack)
Attach the probe and hose assembly to the analyzer by connecting its…
• stack-gas thermocouple to the analyzer’s T-STACK connector,
• stack-gas hose to the analyzer’s GAS connector,
• draft hose to the analyzer’s +∆P connector.
Observe that the probe connectors are of different sizes and shapes,
which prevent incorrect connection to their associated connectors on the
analyzer.