Bacharach PCA3 Installation and operating instructions

PCA®3 Manual Addendum

September 2011

0024-9483 Rev 0

ADDENDUM

This addendum applies to the PCA®3 Operation and Maintenance Manuals

0024-9472 Rev 1 (Domestic) and 0024-9473 Rev 2 (Siegert).It covers the

new Manual Zero feature. If you have any questions, contact Bacharach

Customer Service.

The new

manual zero feature provides a choice of zero mode during startup:

the existing Auto Zero or the new Manual Zero.

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 during the calculation of CO.

Auto Zero:

Auto Zero (among other things) determines the zero reading of the CO

channel in fresh air and provides an offset for the CO measurements. Manual

zero is used to detect CO that may be present during start-

up. The

auto/manual zeroing option allows the operator to select the start-up mode. It

is selectable from the CO Zero Setting of the Setup Menu.

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.

1. From the SETUP MENU, use the ▲▼ buttons to highlight CO Zero

Setting, and then press ENT to display the CO ZERO SETTING MENU.

2. Use the ▲▼ buttons to highlight the desired option (Manual or Auto

Zero), and press ENT to save the selection and re-display the SETUP

MENU.

Both methods take the user through a 60-second count down to establish a

new zero. The manual mode establishes a fresh air zero and stores it for use

during instrument startup.

∇∇∇

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