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Low pressure sight level indicators (glass level gages) are designed to maximize the mechanical and economic advantages of ductile iron covers and are used in less demanding process applications. These units are used in direct reading liquid level measurement for low pressure tanks applications in the petroleum, chemical and general process industries.
There are 2 low pressure indicator models: the Model RL-Reflex Low Pressure and Model TL-Transparent Low Pressure. Reflex gages (RL) have a single vision slot in which light can enter the chamber. Above the liquid level, light is reflected and usually appears silvery. Area where liquid level is filled becomes transparent or dark/opaque depending on the medium being observed. Transparent gages (TL) have a vision slot on both sides of the chamber. Light enters on the opposite side of the observer so both the level of a liquid and characteristics can be seen. For observation in dark environments, illuminators are available for use with transparent gages.
FEATURES
• No power requirements • Non-intrusive
• Not dependent on liquid characteristics
• Provide accurate direct liquid level measurement in remote locations • Suitable for vacuum applications • Unlimited lengths • FM Approved
• Reflex or transparent glass
SPECIFICATIONS Standard Connection Type Threaded End Connection: ½” NPTF Optional Connection Types End Connection
Threaded: ¾" NPTF Socketweld: ½” and ¾” Female Flanged Side Connection Back Connection* Size Visible lengths Pressure Ranges Temperature Ranges
Standard Materials Cover
Chamber Gaskets Glass
Options *Typically reflex only.
Threaded: ½” NPTF and ¾" NPTF Socketweld: ½” and ¾” Female Flanged
Threaded: ½” NPTF and ¾" NPTF Socketweld: ½” and ¾” Female Flanged
1 to 9 gage glass 3-¾” to 139-¾”
Reflex (RL): 1800 psi min to 2400 psi max Transparent (TL): 500 psi min to 2,000 psi max
-20°F to 800°F Ductile Iron
ASTM A105 forged steel GRAFOIL®
Borosilicate Glass to 600°F Aluminosilicate Glass to 800°F (Transparent only)