Bacharach PCA 400 - Sensor Setup

0024-9551 Revision 1
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PCA
®
400 User Manual
IMPORTANT: The PCA
®
400 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 oset for the CO measurement. A manual zero detects
background CO during startup.
IMPORTANT: Both methods for zeroing CO require that the analyzer be turned ON
in fresh air; otherwise, incorrect CO readings will occur.
IMPORTANT: 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 warm-up.
Fig. 4-2: Gas Sensor Positions
Position 1 Position 2 Position 3 Position 4
Auto-Zero
When the CO channel is set to Auto-Zero, the CO sensor is zeroed to the ambient CO level
during start up.
Changing CO Zero Method
Auto-Zero determines the zero reading of the CO channel in fresh air and provides an oset
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.
f To change the CO Zero settings: Main Menu  Settings ( )  CO Zero  select Auto-Zero
or Manual Zero
4.8 Sensor Setup
The PCA
®
400 is designed to allow sensors to be interchanged in the eld; allowing users to
perform combustion tests for multiple gases with the same analyzer.
Changing Sensor Setup
f To change Sensor Setup: Main Menu  Settings ( )  Sensor Setup  select desired
sensor from dropdown menus  press Save ( )