All the items are manufactured as per customer specification of MOC, range and operating condition in as per Sigmas standard design and engineering practice.

SIGMA's Sight Flow Indicator (Flow Glass) are designed to facilitate instant visual indication of liquids flowing through pipes even from a distance. Visual inspection and proper control of vital areas are important in processes for proper operation of well-designed plants.

These are available in various types such as Flapper, Drip Lip, Full View, Elbow etc. with Double or Single windows in Flanged or Screwed and other end connection. For ease of installation, Flanged Type for sizes 3" and above are preferred

• SIGMAs Manifold Valves provide a safe, conventional method of isolating, blocking, bleeding and calibrating instruments, meters and pressure transmitters. These valves are available in numerous body, bonnet and seal configurations with NPTF, Tube Fittings and / or instrument flange connections.
• The manifold valves operate up to 415 kg/ sq.cm. Choice of manifold valve with different body patterns and hard seat models utilizing either a vee, ball or non rotating stem etc are available.

CONDENSATE POTS are used to catch and hold condensate and foreign material. This helps keep manifold orifices clean and free of foreign material. They are located upstream of the instrument and have a bottom drain so that they may be cleaned.

Installation can be either vertical or horizontal lines between primary (Flow Meter) and the secondary (transmitter/ gauge) to act as a barrier to the line fluid permitting direct sensing of the flow conditions. Units should be mounted at the same level minimizing possible error that could arise due to unequal head of fluid in the connecting pressure lines.

SEAL POTS (sometimes called condensate pots) are used to allow a liquid seal between the instrument and flowing gases such as steam. Their function is to keep the liquid level constant in the impulse tubes. For example, in boiler liquid level applications the high pressure (HP) side of a differential pressure transmitter is connected to the vapor space on top of the steam drum. Steam condenses in the chamber or seal pot and fills the impulse line with condensate. The seal pot is located to allow the condensate to drain back to the source thus keeping the liquid level constant.

SIGMA's Cable Float Switch (Tilt Type) has a double chamber construction to make it absolutely hermetic. Switch differential is set with the help of a counter weight that can be adjusted alongside the cable of the switch. Its non-toxic body materials and mercury-free operated micro switch enable its use in drinking water applications.

torque free seal at all tubing connections. Fittings confirm to ANSI 31.1, ANSI B 31.2, ANSI Sec VIII and BS 4368.

SIGMA's Pipe Fittings are designed for high pressure applications on hydraulic and pneumatic lines, fittings are manufactured upto a rating of 10000 PSI as per DIN 2353 & FS 8801 - 8805 standards. Forged fittings
as per ASME B 16.11.

SIGMAs Needle Valve are available in two way, three way, multiport, single block & bleed, double deck and bleed. These Needle valves are available in variety of end connections screwed male/female pipe ends which confirm to ferrule designs.

Valves as per custom needs with any end connections, for pressure ranging from 10 kg/cm2 to 700 kg /cm2, can be offered. Isolation needle valve upto 10000 PSI are available for hassle free long life in process lines. These valves can be used to isolate, calibrate and drain the process lines.

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's Float operated Reed Level Switch are ideally designed for liquid level indication in tanks. The design is simple and compact. Typical applications are water, diesel, chemical storage and hydraulic tanks. The level switch consists of a sealed tube inside which hermetically sealed Reed Switches are placed at points where switching operations are required. The magnetic float raises / falls with the liquid level and operates / re-operates the Reed Switch (make or break on rise / fall of liquid level specified). The REED Type Level Switch is available in Top Mounted and Side Mounted Version.

SIGMA's Tank Level Indicators are float operated target type suitable for liquid level gauging of fixed roof, floating roof, open type vertical storage tanks and underground sumps for water, oil, solvents etc. The tank level indicators are of simple construction and are easy to install. They are very sturdy and require no maintenance. A float operated tank indicator comprises of a float that is located within guide cables. The guide cables whose ends are fastened on to an anchor bar are kept straight and wrinkle free by tension devices. The anchor bar is either grouted or welded to the tank bases. The float cable is wound over a set of pulleys, which are secured in the pulley housing. One end of the float cable bears the float and the other end carries a pointer assembly with a counter weight for balance. Tank level indicator float operated type is for fixed roof, floating roof, open top and under ground storage tanks.

SIGMA's Magnetic Float Operated Level Transmitter is a simple and reliable technique for continuous level indication and control of any liquid, chemically compatible with the (sensor) material, unaffected by electrical
conductivity, temperature, pressure or viscosity. The float is designed for variety of liquids.

The Transmitter consists of a float & guide stem assembly in non-magnetic material to achieve undisturbed flux. A chain of closely spaced glass encapsulated reed switches & resistors are placed inside the guide tube. During rise and fall of liquid level, the magnetic float moves & actuates a reed switch in the chain. The sensed voltage is fed to the transmitter located in the enclosure for conversion to a signal of 4-20 mA.

All the items are manufactured as per customer specification of MOC, range and operating condition in as per Sigmas standard design and engineering practice.

SIGMA's Sight Flow Indicator (Flow Glass) are designed to facilitate instant visual indication of liquids flowing through pipes even from a distance. Visual inspection and proper control of vital areas are important in processes for proper operation of well-designed plants.

These are available in various types such as Flapper, Drip Lip, Full View, Elbow etc. with Double or Single windows in Flanged or Screwed and other end connection. For ease of installation, Flanged Type for sizes 3" and above are preferred

• SIGMAs Manifold Valves provide a safe, conventional method of isolating, blocking, bleeding and calibrating instruments, meters and pressure transmitters. These valves are available in numerous body, bonnet and seal configurations with NPTF, Tube Fittings and / or instrument flange connections.
• The manifold valves operate up to 415 kg/ sq.cm. Choice of manifold valve with different body patterns and hard seat models utilizing either a vee, ball or non rotating stem etc are available.

CONDENSATE POTS are used to catch and hold condensate and foreign material. This helps keep manifold orifices clean and free of foreign material. They are located upstream of the instrument and have a bottom drain so that they may be cleaned.

Installation can be either vertical or horizontal lines between primary (Flow Meter) and the secondary (transmitter/ gauge) to act as a barrier to the line fluid permitting direct sensing of the flow conditions. Units should be mounted at the same level minimizing possible error that could arise due to unequal head of fluid in the connecting pressure lines.

SEAL POTS (sometimes called condensate pots) are used to allow a liquid seal between the instrument and flowing gases such as steam. Their function is to keep the liquid level constant in the impulse tubes. For example, in boiler liquid level applications the high pressure (HP) side of a differential pressure transmitter is connected to the vapor space on top of the steam drum. Steam condenses in the chamber or seal pot and fills the impulse line with condensate. The seal pot is located to allow the condensate to drain back to the source thus keeping the liquid level constant.

SIGMA's Cable Float Switch (Tilt Type) has a double chamber construction to make it absolutely hermetic. Switch differential is set with the help of a counter weight that can be adjusted alongside the cable of the switch. Its non-toxic body materials and mercury-free operated micro switch enable its use in drinking water applications.

torque free seal at all tubing connections. Fittings confirm to ANSI 31.1, ANSI B 31.2, ANSI Sec VIII and BS 4368.

SIGMA's Pipe Fittings are designed for high pressure applications on hydraulic and pneumatic lines, fittings are manufactured upto a rating of 10000 PSI as per DIN 2353 & FS 8801 - 8805 standards. Forged fittings
as per ASME B 16.11.

SIGMAs Needle Valve are available in two way, three way, multiport, single block & bleed, double deck and bleed. These Needle valves are available in variety of end connections screwed male/female pipe ends which confirm to ferrule designs.

Valves as per custom needs with any end connections, for pressure ranging from 10 kg/cm2 to 700 kg /cm2, can be offered. Isolation needle valve upto 10000 PSI are available for hassle free long life in process lines. These valves can be used to isolate, calibrate and drain the process lines.

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's Float operated Reed Level Switch are ideally designed for liquid level indication in tanks. The design is simple and compact. Typical applications are water, diesel, chemical storage and hydraulic tanks. The level switch consists of a sealed tube inside which hermetically sealed Reed Switches are placed at points where switching operations are required. The magnetic float raises / falls with the liquid level and operates / re-operates the Reed Switch (make or break on rise / fall of liquid level specified). The REED Type Level Switch is available in Top Mounted and Side Mounted Version.

SIGMA's Tank Level Indicators are float operated target type suitable for liquid level gauging of fixed roof, floating roof, open type vertical storage tanks and underground sumps for water, oil, solvents etc. The tank level indicators are of simple construction and are easy to install. They are very sturdy and require no maintenance. A float operated tank indicator comprises of a float that is located within guide cables. The guide cables whose ends are fastened on to an anchor bar are kept straight and wrinkle free by tension devices. The anchor bar is either grouted or welded to the tank bases. The float cable is wound over a set of pulleys, which are secured in the pulley housing. One end of the float cable bears the float and the other end carries a pointer assembly with a counter weight for balance. Tank level indicator float operated type is for fixed roof, floating roof, open top and under ground storage tanks.

SIGMA's Magnetic Float Operated Level Transmitter is a simple and reliable technique for continuous level indication and control of any liquid, chemically compatible with the (sensor) material, unaffected by electrical
conductivity, temperature, pressure or viscosity. The float is designed for variety of liquids.

The Transmitter consists of a float & guide stem assembly in non-magnetic material to achieve undisturbed flux. A chain of closely spaced glass encapsulated reed switches & resistors are placed inside the guide tube. During rise and fall of liquid level, the magnetic float moves & actuates a reed switch in the chain. The sensed voltage is fed to the transmitter located in the enclosure for conversion to a signal of 4-20 mA.