Liquid Level Gauges

Product Details

Product Description:The product is designed for safe and positive visual indication of liquid level in vessels under high pressure & temperature conditions. These gauges have a prism glass window that uses the basic optical principles of light refraction & reflection to enhance the indication of the liquid level. It is a flat glass gauge, which has precision moulded prismatic grooves cut on its inner side, which comes in contact with the medium. Light striking the glass covered by liquid is refracted (absorbed) into the liquid making this portion appear black, whereas light covering the vapour space is reflected back towards the viewer, making it appear silvery-white. Thus, a sharp clear line marks the liquid level.Specifications:Gauge Classification : Standard ChamberGauge Glass : Klinger / Maxos Make Tempered borosilicate (Imported)in 30mm width as standard.Cushion : SS with GraphiteGasket : SS with GraphiteBody (Liquid Chamber) : ASTM A-105, CS A-105 (ASTM 105)Cover Plate : CS (EN-8), ASTM A-105Bolts and Nuts : EN-8CC Distance : 300, 320, 385, 400, 450,500,600,700,800,900,1000 MMGauge Connection : Straight Through / Hook -UpProcess Connection : Flanged to BS, ANSI or DINOrientation of PC : Side Mounted at Top/BottomIsolating valves : Integral Offset Needle ValveAir Vent : Plug (CS A-105)Drain : Globe/Needle valveMax. Test Pressure : 0-70 Kg/cm²Max. Temperature (°C) : 0-400°CProduct Features : 1. Long service life2. Easy installation3. Tempered Borosilicate Glass, resistant to chemicals, thermal & mechanical shock4. The offset designed isolation valve allows easy cleaning of the gauge body without removing the same from the boiler. WORKING PRINCIPLE Reflex glass level gauges working principle is based on the light refraction and reflection laws. Reflex glass level gauges use glasses having the face fitted towards the chamber shaped to have prismatic grooves with section angle of 90°. When in operation, the chamber is filled with liquid in the lower zone and gases or vapors in the upper zone; the liquid level is distinguished by different brightness of the glass in the liquid and in the gas/vapor zone. The reflex level gauges do not need a specific illumination: the day environmental light is enough. Only during the night an artificial light must be provided. APPLICATION Reflex glass level gauges can be used in most of the cases and offer great advantages in terms of: low initial cost, low operating cost, easy level reading. Reflex level gauges cannot be used in certain cases as for example: when the separation level between two liquids has to be read (interface) when besides the level indication, the observation of the liquid colour is required when the process fluid is high-pressure water steam, since in this case the glass must be protected from the solvent action of the boiler water by using mica shields when the process fluid is such that can corrode the glass (e.g. high temperature alkaline solutions or hydrofluoric acid), since ica shields or Polytrifluorochloroethylene shields must be used to protect the glass.