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Spherical ionization gauge. 205B with 3" soft glass tube on top as inlet measurement port. UV-style ceramic base: 1 and 4 heater, 2 plate, 3 grid.
Sibley gives wire lead terminations for this model. The UV base of the sample in the photos was added later, to the customer specs.
As ionization gauge the anode is biased negative, -2 to -10 volts, while the grid must be positive, 100 to 125 volts typical, 5 to 25 mA. In operation filament voltage must be reduced for a grid current of 21 mA at 110 V DC. In this condition the pressure in mm. of mercury is about five times the plate current in amperes, P = 5 Ip.
Similar to the D-79512, but for the bulb shape and the glass type, nonex for that one.
Data and applications available in the attached PDF.
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