| 摘要 |
A fluid level gauge for determining the water level within a boiler steam drum or similar device, wherein optical grade synthetic sapphire is utilized as a replacement for the conventional mica reinforced glass. The fluid level gauge is typically used for measuring a fluid level in a tank interior, and comprises a gauge body defining a cavity and first and second end openings respectively formed at or near first and second ends of the gauge body. The end openings allow fluid communication between the gauge body exterior and the cavity. Viewing means comprising one or more synthetic sapphire shield or synthetic sapphire lense are provided for observation of the cavity interior. The synthetic sapphire shield(s) or lense(s) are sealingly engaged in fluid-tight manner with the gauge body, and prevent the discharge of steam, water, or other fluids from the tank into the environment when the fluid level gauge is connected to the tank.
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