MKS Granville-Phillips 274 Series, Инструкция по эксплуатации

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Technical Information
Ionization Gauge Instruction Manual - 274026 - Rev. B
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Gauge Specifications
Table 4-4 Series 274 Bayard-Alpert Gauge Physical and Operating Data
Physical Data Tubulated Gauge EB Degassable Nude Gauge I
2
R Degassable Nude Gauge
Tubulation
.75 inch (19mm) or 1 inch
(25mm) dia. x 2.25 inch (57mm )
long, Kovar, Pyrex, or flanged N.A. N.A.
Envelope Nonex 7720 Glass, 2.25 inch
(57mm) dia. x 5 inch (127mm)
long Nude with 2.75 inch o.d.
ConFlat flange Nude with 2.75 inch o.d.
ConFlat flange
Mounting Position
Any - Vertical preferred Any Any
Collector
Tungsten, .010 inch dia. Tungsten, .005 inch dia. Tungsten, .010 inch dia.
Cathode
Dual tungsten or one thoria
coated Iridium Dual tungsten or dual thoria
coated Iridium on replaceable
assembly Thoria coated iridium on
replaceable assembly
Grid Refractory metals Refractory metals Refractory metals
Overall Length 6 inch (152mm) 4.125 inch (105mm) 4.125 inch (105mm)
Insertion Length N.A. 3 inch (76mm) 3 inch (76mm)
Operating Data Tubulated Gauge EB Degassable Nude Gauge I
2
R Degassable Nude Gauge
Sensitivity for N
2
10/Torr 25/Torr 10/Torr
Typical Accuracy
±
20%
±
20%
±
20%
X-ray Limit About 3 x 10
-10
About 2 x 10
-11
About 4 x 10
-10
EB Degas
100 watts max. 40 watts max. 100 watts max., 70 watts
nominal
I
2
R Degas 6.3 to 7.5 VAC at 10 A N.A. 6.3 to 7.5 VAC at 10 A
Bakeout 450
o
C 450
o
C 450
o
C
Cathode Heating Current 4 to 6 A 2.5 to 3.5 A 4 to 6 A
Cathode Heating Voltage 3 to 5 V 3 to 5 V 3 to 5 V
Cathode Heating Potential +30 Vdc +30 Vdc +30 Vdc
Collector Potential 0 V 0 V 0 V
Grid Potential +180 Vdc +180 Vdc +180 Vdc
EB = Electron Bombardment Degas / I
2
R = Resistance Heated Degas / N
2
= Nitrogen / N.A. = Not Applicable