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Operating Specifications
Item
Filament Voltage
Filament Current
Element Voltages
Degas Power
Requirements (40 W)
Measurement
Specifications
Materials
UHV-24/UHV-24p Ionization Gauge
Table 1 Normal Operating Requirements
3 to 4.5 V (AC or DC) - Varies with pressure and emission
current
2.5 to 3.5 A - Varies with pressure and emission current
Collector voltage: V
Filament voltage: V
Grid voltage, V
g
Grid Voltage: +600 VDC max
Emission Current (total): 67 mA DC
Filament Voltage: 7 V
Sensitivity:
❑
25/Torr (UHV-24), nominal
❑
20/Torr (UHV-24p), nominal
Emission Current:
❑
4 mA for widest measurement range 5x10-
-4
1x10
Torr
10 mA for pressures lower than 5x10-10 Torr 0.1 mA
❑
for pressure over 1x10
Filament: Tungsten or thoria-coated Iridium
Filament Supports: SST
Collector - tungsten:
❑
0.007" diameter for UHV-24
❑
0.002" for UHV-24p
Grid: SST
Feedthrough: SST, Alumina, Nickel Alloy
Requirement
= 0
c
= 28 VDC
fil
= +180 VDC
-4
Torr
10
Torr to
13
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