Specialized - Gauge Tube ·Gauge
Hot-filament Pirani vacuum gauge tube designed for rough-vacuum measurement from approximately 1 to 1000 microns and for vacuum-system leak detection.
The Sylvania R1111 is a hot-filament Pirani tube for measuring vacuum pressure from roughly 1 to 1000 microns and for leak detection.
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
No fixed ratings are recorded for this section.
Published ratings and characteristics promoted semantically from the approved source.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Filament Resistance
16.25 ohm
Approximate midpoint of published 15.5-17.0 ohm range
Calibration Current
100 mA
Pirani bridge measurement
Data set 02
Published operating points and test conditions from this source.
Cold Filament Resistance
6.6 ohm
Hot Filament Resistance Minimum
15.5 ohm
Evacuated; Current=100mA
Hot Filament Resistance Maximum
17 ohm
Evacuated; Current=100mA
Useful Pressure Minimum
1 micron
Useful Pressure Maximum
1000 micron
Measurement Precision
5 percent
Approximate
Operating Voltage
1.5 V
Filament Operating Current
100 mA