Perma Pure Baldwin 3300 FLow Control Drawer - Manual (Page 7)

Section D: Operation 7
D: O
PERATION
General Overview
Sample gas is extracted from the process through a filter probe, such as a Baldwin™-
Series Heated Filter Probe, to remove particulate. The filtered gas is then transported to
a Baldwin Sample Conditioning System where the moisture is removed. The Sample
Conditioning System supplies a clean, dry sample when it enters the back panel of the
Model 3300 Flow Control Drawer. The stack probe filter and sample pump performance
are indicated by the Flow Control Drawer Vacuum/Pressure Gauges.
Note: Please refer to the attached Model 3300 Flow Diagram for an example of an
integrated continuous emissions monitoring system flow schematic using the Model
3300 Flow Control Drawer.
Flow from the Sample Conditioning System enters the Model 3300 Flow Drawer
sample/calibration manifold. Here, either sample or calibration gas (for direct calibration)
can be directed to the atmospheric pressure sample manifold and then on to the
individual analyzer gas channels. Individual sample flowmeters indicate the flow rate of
each gas channel. A bypass flowmeter vents excess sample gas not used by the
continuous gas channels and also acts as an atmospheric vent.
The Model 3300 Flow Control Drawer has the ability to switch the sample and as many
as eight (8) calibration gases to the analyzer rack directly or via the total sampling
system. This is done through two (2) sets of solenoid valves: (1) the calibration gas
solenoid valves which are mounted on a common manifold at the rear of the drawer, and
(2) the system/direct solenoid valves located in the front of the drawer. A block & bleed
solenoid valve, which prevents the manifolds from being pressurized during sampling, is
also part of the system/direct solenoid valve set.
The calibration function will only take place when both a calibration gas solenoid valve
and either the system solenoid valve or direct solenoid valve have been selected. In
Local mode, the calibration gas solenoid valves are cascaded, that is if there are more
than one (1) calibration gas solenoid valve switches in the on position, only the highest
numerical calibration gas solenoid valve will be active. This is not the case with
computer control. The programmer can select any or all of the calibration gas solenoids.
Also, computer control is not allowed in the Local mode. While in the Local/Direct
Calibration mode, manual blowback is allowed, but not while in the Local/System
Calibration mode. While under computer control, blowback is allowed when nothing else
is activated, but not in any Calibration mode.
The Model 3300 has a provision for system bias checks. System integrity is verified by
comparison of calibration gas flow through the stack filter assembly to calibration gas
flow directly to the gas analyzers. This check indicates problems such as system
leakage and gas component loss.
A probe filter blowback relay contact is provided on the Flow Control Drawer to facilitate
Manual or computer initiated blowback. For Blowback there is a 250V, 6Amp dry