• Sigma Instruments Company

Weld Pad Flat Glass Level Gauge

Weld Pad Flat Glass Liquid Level Gages are designed to become an integral part of the vessel, Weld pad liquid Level Gages are directly mounted to the tank or vessel to be measured. Sigma Welding Pad Gages are used where conventional gage and valve construction is impractical because of solid matter in suspension, under conditions where the thermal error caused by piping to a gage glass cannot be tolerated or where space requirements suggest their use. Included are applications involving high vibration, highly viscous liquids or liquids with considerable amounts of solids. Sigma offers end users a flat or radius weld pad gage in varying lengths and configurations. It is possible to monitor color, clarity and level of a gas / liquid interface. Because there are no nipples through which the process liquid enters the gage, clogging potential is eliminated. Sigma Welding Pad Gages are made in both Reflex and Transparent Types. Reflex gages are used where liquid reading only is required. Transparent gages are usualy used where installation is made on each side of the vessel to give see-through visibility. Sigma weld pad gages comprise of six basic components. Each component may vary slightly, depending on the desired physical and mechanical properties for the gage.

1. Chamber - provides a pressure retaining metallic surface for weld attachment to the tank or vessel. Vessel chamber surface can be radiused to match tank or vessel curvature. Slot(s) are machined into the chamber to provide direct visualization of the process fluid.

2. Gasket - seal the gap and prevent leakage between the chamber and the glass. Gaskets are available in a variety of materials for compatibility with the media in the gage.

3. Cushion - acts as a protective buffer between the glass and the cover. For proper sealing, cushions must be as hard or harder than the gasket material.

4. Cover - protects the glass assembly from external hits and provides a flat, rigid surface that is used to evenly compress the gage assembly.

5. Bolting - compresses the components between the covers & weld pad chamber