PCA
3 Manual
10
0024-9473 Rev 3
“ERRORS DETECTED” is displayed along with a list of the errors. These errors
must be corrected before proceeding with the combustion test.
Before starting a test be sure to select the fuel being burned. The default fuel
selected is Natural Gas. Note that the name of the fuel being burned is indicated
at the top of the run/hold screen.
1.5.2. The Combustion Test
To assure correct combustion efficiency calculations, the analyzer must know the
burner’s primary-air temperature. The analyzer normally uses its internal
temperature sensor for the primary-air temperature value, but this method is only
acceptable if the burner is using ambient room air. If the burner is drawing in cold
outside air, we recommend that the optional T-AIR thermocouple be used. This
thermocouple plugs into the bottom of the analyzer and is placed in the burner’s
primary-air stream.
Begin the combustion test by first inserting the analyzer’s probe tube into the
stack-gas stream of the appliance under test, and then pressing the
RUN/HOLD
button to display the Combustion Test RUN screen. The analyzer will begin to
continuously monitor the stack temperature, %O
2
and emission levels in the
stack gas and then display measured and calculated values on its display. The
recommended time required to achieve a stable measurement is a minimum of 3
minutes.
During a test, the CO
LOW
sensor is protected from high CO levels by being
automatically flushed 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 briefly pressing the
I/O
button.
1.5.3. Turning Off the PCA
®
3
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 predetermined levels.
1.6. Features and Benefits
•
Powered by 4 ‘AA’ alkaline batteries or NiMH rechargeable batteries. An
optional AC adapter provides extended operation.
•
O
2
and Hydrogen-compensated CO
Low
measurements are standard.
Optional measurement of up to two additional gases, including CO
High
, NO,
NO
2
, or SO
2
.
Summary of Contents for PCA3
Page 23: ...PCA 3 Manual 0024 9473 Rev 3 23 Figure 3 2 Connecting the Probe to the Analyzer...
Page 64: ...PCA 3 Manual 64 0024 9473 Rev 3 Figure 5 23 Printer Alignment and Sample Printout...
Page 84: ...PCA 3 Manual 84 0024 9473 Rev 3 Figure 7 2 Inside View with Rear Case Removed...
Page 86: ...PCA 3 Manual 86 0024 9473 Rev 3 Figure 7 5 Wire Routing Connectors and Solder Connections...
Page 101: ...PCA 3 Manual 0024 9473 Rev 3 101...
Page 102: ...PCA 3 Manual 102 0024 9473 Rev 3...
Page 103: ...PCA 3 Manual 0024 9473 Rev 3 103...
