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I
Overview
A. General Description
The Terranova Scientific Model 921 Cold Cathode Gauge Controller displays vacuum pressure
as measured from an HPS inverted magnetron gauge tube. It displays vacuum measurements
based on ionization of the residual gas. The Model 921 controller covers the range from 3 x 10
-
10
Torr (mbar) to 10
-2
Torr (mBar), and controls two relays with independent set points.
B. Specifications
1. Useful Measuring Range
3 x 10
-10
Torr (mBar) to 10
-2
Torr (mBar), for air or nitrogen; range selection is automatic
2. Display Range
3 x 10
-10
Torr (mBar) to 10
-2
Torr (mBar)
3. Units of Display
torr or mBar; user selectable
4. Vacuum Gauge
HPS Inverted Magnetron gauges, series 421 or I-Mag®, series 423.
5. Operating Temperature Range
+2 to +50 deg. Celsius
6. Pressure Display
4-digit bright
LED
, 10 mm high
7. Display Indicators
red
LED
for set points and other parameters
8. Process Control Set Points
two, adjusted by front panel push-button
9. Process Control Relays
two relays, 2 amp, 240 VAC contacts; independent Normally Open and Normally Closed; +5
volts is provided for TTL applications; available through the D15 accessory connector
10. Nonvolatile Memory
for all user adjusted parameters
I-Mag® is a registered trademark of MKS Instruments Inc.
TELEPHONE: 650-969-8811 TOLL-FREE (U.S. only): 800-446-8811 FAX: 650-965-0764 EMAIL: [email protected]
www.duniway.com
