A
PPENDIX
C.
P
RESSURE
S
WITCH
M
ODIFICATION
The pressure switch option provides:
•
Vacuum pressure switch 1.6-27 inHg Vacuum
•
Sample pressure sensor 2-48 psig (50 psig Max)
•
Calibration gas pressure sensor 2-38.3 psig (50 psig Max)
Outputs
1. The standard output from all switches is Form C contact, 1 Amp
2. Outputs are terminated on the Flow Control Drawer back panel on the
Pressure Transducer Terminal Strip.
Connections
N/O
Common
N/C
Vacuum
Pin 11
Pin 12
Pin 13
Sample
Pin 14
Pin 15
Pin 16
Calibration gas
Pin 17
Pin 18
Pin 19
Sensor Calibration
All switches are set to mid scale at the factory. The flow drawer lid must be removed for
access the switches for adjustment.
Interior of Modified 4P-3300P with lid removed
Cal Gas
Sample
Vacuum
Front Panel