Electric heating – Heating devices – Resistive element: igniter type
Patent
1985-08-13
1987-05-26
Goldberg, E. A.
Electric heating
Heating devices
Resistive element: igniter type
219275, 219362, 236 44R, 122 40, F22B 128
Patent
active
046688544
ABSTRACT:
The humidity within a chamber is controlled by injecting pulses of steam therein, the duty cycle of the steam pulse input being increased when the humidity of the chamber is lower than desired and decreased when the humidity of the chamber is higher than desired. Each steam pulse is generated by injecting a pulse of water through a small inlet tube into a steam generator comprising a tank surrounded by a band heater, the tank being preheated to a high temperature such that the water quickly turns to steam as it is injected. The steam is then vented into the aforementioned chamber. A detector, mounted within the chamber, produces a signal of magnitude proportional to the relative humidity in the chamber and this signal is input to a control circuit for producing a pulse width modulated control signal of duty cycle varying with the difference between the magnitude of the humidity sensor signal and an adjustable set point signal. The control signal opens and closes a solenoid valve which effects the injection of water into the steam generator.
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Goldberg E. A.
NAPCO Scientific Company
Walberg Teresa J.
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