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Our Products
Our offered Product range includes Flow Switches and PNEUMATIC LEVEL SWITCH.
SIGMA's Flow Switch is an extension of the level switches. There are two types of flow switches : one for low flow / line size up to 50 mm line size (Model FS 1000) and another from 25 mm onwards up to 800 mm or above (Model FS 1010).
Operating Principle :
Model FS 1000 is a valve type Flow Switch wherein an increase in flow through the body raises the valve disc depending upon the flow. This in turn raises the magnetic sleeve moving inside a non-magnetic enclosure. The movement of the sleeve attracts the magnet located outside the tube which in turn actuates a micro switch. Decrease in flow reverses the action.
Model FS 1010 is a target type which moves from a vertical position to a near horizontal position as the flow increases. This change in position moves a magnetic sleeve in a non-magnetic enclosure. The movement of the magnetic sleeve attracts a magnet which in turn actuates a micro switch. Decrease in flow brings the target back to the vertical position.
SIGMA's Pneumatic Level Switches are used in application where electrical switching is not recommended or electricity is not available. The working principle is the same, except that the magnet indirectly actuates a 3/2 valve for changeover. This 2 system requires minimum 2 kg/cm clean filtered air, preferably through an AFR.
Side Mounted (with / without cage) : Buoyancy force of process liquid on a float causes the float to move with the liquid's surface. Float movement pivots a magnet into the field of a like-charged switch magnet. As the magnets repel each other, the switch magnet moves, actuating the switch.
Top Mounted :Float / Displacer (with / without cage) : Operation is based upon simple buoyancy, whereby a float or a spring loaded weighted displacer rises following the liquid level. A magnetic sleeve, connected to the float / displacer, moves up and operates within a non-magnetic enclosure tube. The magnetic sleeve attracts a pivoted magnet, actuating a switch mechanism located out-side the enclosure tube to give NO or NC changeover. A fall of liquid level will de-actuate the switch mechanism
Sigma Instruments Company (Sigma Instruments Company)
27, Nahur Udyog Industrial Premises, M.M.Malviya Road, Mulund (West), – 400080. ., Mumbai, Maharashtra
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