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III
Overview
A. General Description
The Terranova Scientific Model 906A Convection Gauge Controller displays vacuum pressure as
measured from an HPS Model 317 Convection Enhanced Pirani (CEP) or Granville-Phillips
Model 275 CONVECTRON
®
gauge tube. It displays vacuum measurements based on thermal
conductivity of air/nitrogen or argon. The Model 906A controller covers the range from 0.1
mTorr to 1000 Torr or 0.1 µbar to 1000 mbar, and controls two relays with independent set points.
B. Specifications
1. Useful Measuring Range
0.1 mTorr (µbar) to 995 Torr (mbar), for air or nitrogen; (10
-4
torr (mbar) to 10
3
torr (mbar));
range selection is automatic
2. Display Range
-19 mTorr (µbar) to 995 torr (mbar); pressures lower than -19 mTorr (µbar) display
LO
; pressures
higher than 995 torr (mbar) display
HI
; if cable is not plugged in display shows
OFF
3. Accuracy of Interface to Gauge
Pressure calculation algorithm is accurate to ±1% of published data for the HPS Convection En-
hanced Pirani and the Granville-Phillips CONVECTRON
®
gauge (this is for the 906A controller
only, and does not include uncertainty of the gauge).
4. Units of Display
torr/mtorr or Bar/mBar; must be specified at time of ordering (see Section V-H for changing Units
of Display in the field)
5. Vacuum Gauge
HPS Convection Enhanced Pirani gauge, series 317 or Granville-Phillips CONVECTRON
®
gauge, series 275
6. Operating Temperature Range
+2 to +50 deg. Celsius
TELEPHONE: 650-969-8811 TOLL-FREE (U.S. only): 800-446-8811 FAX: 650-965-0764 EMAIL: [email protected]
www.duniway.com
