Granville-Phillips Series 330, Instruction Manual, Page: 66 / 76

7 Process Control Module
66
Series 330 Vacuum Gauge Controller
Instruction Manual - 330004 - Rev. 02
plus 10%, i.e., 6.3 + 0.6 + 0.1 or 7 Torr. For setpoints where the second digit is 0.5 or greater the
10% value is rounded up. For example, if the setpoint is programmed to 6.6 Torr the relay will
activate at 6.5 Torr (on falling pressure) and will deactivate when the pressure rises to 6.6 + 0.7 +
0.1 or 7.4 Torr.
• The process control module derives its pressure data directly from the display bus and is unable to
update pressure data while setpoints are being displayed. It will not mistakenly interpret setpoint
data as pressure data, but will simply retain the last displayed pressure data until the SET key is
released.
7.3.3 Relay Polarity Setting
The relays can be set to activate with pressure either above or below the setpoint. A switch is
provided for each channel. For activation below the setpoint, the switch should be in the OFF
position. This is the factory setting. Refer to the numbers on the printed circuit board, not on the
switch body itself, for the channel number.
Figure 7-3 Process Control Module - Top View (Controller Cover Removed)