Sigma Instruments Company

Mulund, Mumbai, Maharashtra

SIGMA's Tubular Gauge Assemblies consist of a pair of Steel Gauge Cocks preferably forged, complete with four (4) Guard Rods or 2 nos C protectors, Guard Rod Holders and Borosilicate Tubular Glass. The Gauge Cocks have Union Bonnets, Stainless Steel Trim, Screwed Renewable Seat, Stainless Steel Ball Checks to automatically shut off the flow of the process fluid in case of glass failure. The Stainless Steel Stem is fitted with an extension tip to unseat the ball check when the valve is in the closed position. Gauge Cocks have Union Connections at valve ends for easier assembly and installation. The Tubular Glass Connections are Stuffing Box Type with a packing bush to prevent torsional stress on the tubular glass when gland nuts are tightened. Gauge Cocks are furnished with Handwheel Operation.

SIGMA's Magnetic Level Gauge provides level indication in a range of operating conditions. It offers maintenance- free, preventive security against leakage, environmental safety, sure and trouble free application against chemically aggressive, harmful or poisonous, inflammable or explosive, pollutants or optically similar fluid interface.

Sigma magnetic level gauge consists of a float chamber, a float, and an external indication device. An engineered float travels inside the gauge and follows the vessel level. The float carries an internal magnet that simply "flips" the flags thus indicating the level. The flags remain flipped until the float returns in the other direction. The magnetic level gauge is unique in that if the flag display is hit nothing will leak as they are magnetically coupled to the float. The float type is determined by the process fluid specific gravity, pressure and temperature. The materials of construction must be compatible with the process fluid. Each float is engineered for proper buoyancy for each particular application for level or interface measurement.

SIGMAs AUGUST series Automatic Tank Gauges are designed to provide continuous liquid level measurement for bulk storage applications. The AUGUST is a float actuated instrument that provides continuous and reliable liquid level measurement, specifically engineered to reduce maintenance and enhance reliability.

In principle, the AUGUST utilizes a large stainless steel float that is attached to a perforated stainless steel tape to detect the liquid level.
The float traces the liquid level rise and fall due to the constant pull-back tension force provided by a power spring. The precisely perforated tape
engages pins on a sprocket drive wheel that in turn drives the measurement counter mechanism. The float is guided between the guide wires that are kept straight/kink free through the tension devices. Alternatively, still wells that shall guide the float can be used where there is no provision for guide wires. This simple, rugged design makes the gauge to perform with negligible maintenance throughout its working life.

SIGMAs Flat Glass Level Gauges are reliable means for accurate measurement and direct observation of process fluids. These are designed to match industry requirements of ruggedness and material mix to widen the scope of application in process tank, pressure vessels and other containers with fluids varying from ordinary water to highly corrosive chemicals.

THE SYSTEM: The Flat Gauges are inevitable means for process fluid measurement when it comes to severity of conditions. The medium to be measured iamber of the level gauge as that of the vessel and is viewed through a glass window. SIGMA Gauge Valves form a major component of the flat glass gauges. Two gauge valves at the ends of the gauge chamber are connected to the tank. Under normal operations, the valves are kept wide open causing the pressure to equalize in the system thus permitting the liquid to seek its true level for observation along the visible length. SIGMA offers Reflex and Transparent type Flat Level Gauges as required by the industry.

SIGMAs Oil Level Gauge / Indicators (Acrylic) are designed for measuring / indication of level of oil or other transmission liquids. The principle of operation is liquid maintaining its level by virtue of gravity. The Oil Level Gauge comprises of a solid block of transparent acrylic (oil chamber) with
graduations as required. The Oil Level Gauge is connected to the storage tank through a single limb or by having two connections drawn from the chamber to the side of the tank. It also contains a vent and a drain. This is typically used for low pressure and low temperature applications.

SIGMAs Oil Level Gauge / Indicators (Glass) is rugged, compact and reliable gauge for visual indication of oil levels in small tanks. The Level Gauge consists of a toughened borosilicate gauge glass tube fitted between metallic end blocks and banjo bolts through a set of o-rings. A slotted steel guard is provided enclosing the glass guage to provide protection from accidental damage. The gauge is mounted parallel to the tank, to form a closed loop causing tank liquid to seek its level in the gauge.