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D. Connect the Gauge Tube
Make sure that the gauge tube is securely connected to the vacuum system, using good vacuum
practice.
E. Attach the Gauge Cable
The gauge cable has a two coaxial connectors for the gauge. One is a high voltage BNC (SH-
VBNC); this connector is for the 4000 volt anode excitation of the gauge. The smaller connector
is an SMB coaxial connector, for the collector signal.
Connect both connectors of the gauge cable to the gauge tube and to the 921 controller.
NOTE
If you have an HPS cable for this series of gauges, you may use it with your
Model 921 gauge controller, since connectors are the same as for the HPS
instruments.
F. Make Relay Connections
You can set two process control set points from the front panel of the controller (
SET
PT
1) and
(
SET
PT
2). The set points control two relays that are accessible through the connector on the back
of the controller.
SET
PT
1 controls relay #1, and
SET
PT
2 controls relay #2. Relay contacts are
available through the D15 Accessory Connector. See Table 1, below on page 11.
G. Make Accessory Connections
The 15-pin D-sub Accessory Connector is on the rear panel of the 921, see Table 1, below on page
11. The connector has female pins; the mating connector must have male pins. Mating D-sub 15
connectors are available from many of the normal electronic sources. If you need help identifying
a source, please contact us.
H. Check Supply Voltage
The Model 921 incorporates a universal power supply. This allows the 921 to operate on any input
voltage from 90
VAC
to 265
VAC
, 47 to 65 Hz.
I. Attach the Power Cord
Plug the power cord into the receptacle in the power module on the rear of the 921.
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