Bacharach PCA3 Spezifikationen PDF herunterladen (Seite 26)

PCA



3 Manual

26 0024-9473 Rev 4

NOTE: The CO

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.

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Bacharach PCA3 Spezifikationen Seite 26