PCA
3 Manual
26
0024-9473 Rev 3
NOTE:
The CO
2
Max value is returned to its default value when the
analyzer is powered down.
4.3. Auto/Manual CO Zero Selections
Select how the PCA
®
3 performs a zero function.
1. Display the MAIN MENU by pressing the
MENU (F2)
button. If
necessary, press
ESC
until MENU appears above
F2
.
2. Use the ▲▼ buttons to highlight SETUP, and then press
ENT
to display
the SETUP MENU.
3. Use the ▲▼ buttons to highlight CO Zero Setting, and then press
ENT
to display the CO ZERO SETTING MENU.
4. Use the ▲▼ buttons to highlight the desired zeroing option (Manual or
Auto-Zero). In the example shown, Manual Zero has been selected.
5. Place the instrument in fresh air to zero, and press
ENT
to start a 60-
second count down.
6. Press
ENT
to save and re-display the SETUP MENU.
Figure 4-3. Auto/Manual Zero Selection
NOTE:
The PCA
®
3 performs a zero function during warm-up. Among
other purposes, an
auto-zero
determines the “zero reading” of the CO
channel in fresh air and provides an offset for the CO measurement.
A
manual zero
detects background CO during startup.
Manual Zero:
When the CO channel is set to manual zero, the analyzer does not
zero the CO sensor to ambient conditions during start up. In this
mode, the “fresh air zero” established during
manual mode
setup
is stored in memory and used for the calculation of CO.
Auto Zero:
When the CO channel is set to auto zero, the CO sensor is zeroed
to the ambient CO level during start up. Important: When using
this mode, the analyzer must be turned ON in fresh air; otherwise,
incorrect CO readings will occur.
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...
