Perma Pure Baldwin 3300 FLow Control Drawer - Manual (Page 8)

Section D: Operation 8
contact form C relay output provided on the back panel for blowback implementation.
There are two (2) vertical terminal block assemblies on the back panel provided for
computer interface. The 16-point terminal block is used for computer control and the 40-
point terminal block is used for computer verification of flow control drawer operation.
Pressure Sensor Board Option
Upstream, (stack filter/and sample line) the pressure drop is actively monitored by a
vacuum transmitter, the sample gas flow is verified by a sample manifold pressure
transmitter and presence of adequate calibration gas is verified by a pressure transmitter
on the calibration gas manifold.
Local Mode Operation
To enter the Local mode, toggle the Remote/Local switch to the right. While in the Local
mode, the operator can perform manual calibrations and blowback.
The flow control drawer is in Local Control when the Local Switch is selected, the red
LED is on and the green Sample LED is on as well. In this mode, all switches on the
front panel are enabled for local operator control and Computer Control is disabled. All
Calibration Gas (CG) functions, Direct/System, and blowback are available for the local
operator. When the Local LED is OFF, the PC or PLC has control and can remotely
duplicate local control functions. The Local Switch provides an output to the PLC/PC to
indicate that the Flow Control Drawer is offline, (i.e., the analyzers’ outputs are not
reliable).
CONTROL FUNCTIONS:
SWITCHES
Sample Blowback Direct
Calibration
System
Calibration
Local X X X
Direct X
System X
Blowback X
Cal Gas 1-8
X X
Manual System Calibration: To perform manual system calibration, toggle the
Direct/System switch to the right. Then toggle any of the Calibration Gas switches to the
right. This will allow the selected calibration gas to flow to the analyzer suite via the total
sampling system. In this mode, manual blowback is not allowed.
Manual Direct Calibration: To perform manual direct calibration, toggle the Direct/System
switch to the left. Then toggle any of the Calibration Gas switches to the right. This will
allow the selected calibration gas to flow to the analyzer suite directly, bypassing the
total sampling system. In this mode, manual blowback is allowed.
Manual Blowback: To perform manual blowback, depress the Blowback switch to the
right. This switch is a momentary switch, that is, it will return when released. When the
operator toggles the Blowback switch, two things happen; first, the blowback relay will be
activated, and second, the direct solenoid valve will be activated. With the direct