4 of 20IntroductionClark-Reliance is a global leader in the level indication and control, sight-flow indication, andfiltration and separation industries. Clark-Reliance is dedicated to offering the largest andbroadest range of instrumentation products and being the single-source for every type of levelmeasurement and control to meet the varying demands of the process industry.Jerguson Gage and Valve, a leading supplier of level gaging products, offers the world’slargest selection of liquid level glass gages, magnetic level gages, liquid level switches andlevel transmitters. Since 1905, Jerguson gages and valves have been installed in a widevariety of liquid level applications, from basic chemical storage tanks to the most advancednuclear aircraft carriers. With complete product offerings in both traditional glass gages andmagnetic gages, Jerguson is able to satisfy customers’ diverse needs.Flat Glass Gages (Armored Gages)Jerguson Flat Glass Gages are simple, rugged instruments engineered to provide accurateliquid level readings for the life of the vessel they are installed on. They are available in acomplete range of models for applications ranging from pure water to highly corrosivechemicals and from cryogenic fluids to superheated steam.Jerguson offers products certified to FM, UL, CSA and ATEX standards and/or designedand constructed in accordance with ASME B31.1, ASME B31.3 and the European PressureEquipment Directive (PED).Like any instruments, Jerguson Flat Glass Gages must be installed, operated andmaintained with reasonable care and due regard for the applications and environment if theyare to provide accurate readings for their service lifetimes.