| 摘要 |
An illuminated gas flow tube comprises an in-line flow tube having a distal end and a proximal end. A gas inlet is co-axially secured to the distal end, and a gas outlet is co-axially secured to the proximal end. A specific gravity ball is located within the in-line flow tube, and moves within the flow tube as a function of gas entering the gas inlet. A phosphorescent or photoluminescent material is configured and arranged to at least partially lengthwise surround a radial exterior portion of the flow tube to illuminate the interior of the tube. An illuminated gas pressure gauge comprises an gas inlet, a pressure sensing element, a transparent cover, and a face that is encased by and seen through the transparent cover, where the face includes markings indicative of pressure. A needle is operatively connected to the pressure sensing element and seen through the transparent cover to provide a visual indication of pressure at the gas inlet, where the face is coated with an illuminating material that allows the gauge to be read in low light conditions.
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