MANUAL P/N 316005 REV: B
45
Chapter 4 - The Capacitance Manometer Module
4.1 Introduction
The Capacitance Manometer module allows pressure measurement from 1.0 x 10
-4
Torr to
1000 Torr, depending on transducer pressure range. Up to 250 mA of current at +15Vdc is supplied to
temperature-compensated transducers. See the Specifications at the end of this chapter for a partial list of
compatible transducers.
The module also operates one Convectron gauge. Refer to Chapter 2 of this manual for information on the
use of the Convectron gauge.
When a six channel process control module is installed, the capacitance manometer can be used to control
the two channels associated with display line "C", channels 5 and 6. The associated "B" Convectron gauge
controls channels 3 and 4.
Analog output is provided for both gauges; the output is linear with pressure for the manometer, and
logarithmic for the Convectron.
4.2 Installation
Units of Measure
The 316 VGC is shipped from the factory preset to display the unit of measure Torr, millibar, or pascal that
you requested. If you want to change the measurement units, proceed as follows:
1.
Shut off power to the control unit.
2.
Remove the top cover. Locate the capacitance manometer PC board.
3.
Locate the millibar and the pascal unit switches.
4.
Leave both switches OFF for Torr units. Turn on the appropriate switch for millibar or pascal units.
5.
Modify the units of measure of the "A" module to be consistent with the capacitance manometer
module.
6.
Slide the label card out of the top of the front panel and apply the appropriate pressure units label.
Figure 4-1 Capacitance Manometer Module, Top View
(Controller Cover Removed)
