Level Gauges
Magnetic Level Gauge
Float and flag level indication with no glass in the process boundary, for toxic, flammable and corrosive liquids.
- Pressure
- Up to 100 bar
- Temperature
- Up to 300 °C
- Range
- Up to 6000 mm
Magnetic level gaugeFlag type
Magnetically coupled flags follow the float. Nothing leaks, even if the indicator is struck.
- Established in Mumbai
- 1973
- Highest rated pressure
- 400 bar
- Highest rated temperature
- 400 °C
- Longest tank gauging range
- 20 m
ISO 9001:2015 based quality system
Design, manufacture and supply are managed on the principles of the ISO 9001:2015 quality management system.
Enlisted with EIL
Sigma is an enlisted vendor with Engineers India Limited, India's leading engineering consultancy for process plants.
IBR certification
Products for boiler and steam service can be supplied with Indian Boiler Regulations certification.
CE mark
Products can carry the CE mark under the Pressure Equipment Directive or Sound Engineering Practice.
Product catalogue
Seven product families. One manufacturer.
21 instruments, from a simple tubular gauge to a 20 metre automatic tank gauge, each built to the pressure, temperature and material your process demands.
Family 014 items
Level Gauges
Direct visual level reading for tanks, vessels and boilers.
View range
Family 022 items
Tank Level Indicators
Float operated gauging for bulk storage tanks.
View range
Family 036 items
Level Switches
High, low and intermediate level alarms you can rely on.
View range
Family 041 item
Level Transmitters
Continuous level measurement with a 4 to 20 mA output.
View range
Family 051 item
Sight Flow Indicators
Instant visual confirmation of flow in your pipelines.
View range
Family 061 item
Flow Switches
Flow and no flow alarms for small and large lines.
View range
Family 076 items
Allied Products
Pots, manifolds, valves and fittings that complete the installation.
View range
Built to order
Your specification
Any Sigma instrument can be made to your material of construction, range and operating conditions.
Discuss a custom build
Sigma · the sign for a sum total
Why Sigma
Named for the sum total. Built to cover it.
Since 1973 our purpose has been to serve industry with a sum total of fluid monitoring devices and allied instrumentation, so one supplier can cover a plant from the storage tank to the impulse line.
- 01
Designed and built in Mumbai
Every instrument is engineered, manufactured and supplied by our own team.
- 02
Made to your process conditions
Materials, ranges and connections matched to your fluid, pressure and temperature.
- 03
Trusted on repeat
Leading companies, consultants and end users in India and abroad keep coming back with repeat orders.
Featured instruments
Built for severe duty
Pressures up to 400 bar, temperatures up to 400 °C and tank heights up to 20 metres. A few of the instruments plants specify most.
Level Switches
External Cage Level Switch
Cage mounted magnetic float switch with an anti vibration design, widely used in petroleum and power plants.
- Pressure
- Up to 200 bar
- Temperature
- Up to 400 °C
- Connections
- Flanged to ANSI, DIN or BS, size as required
Tank Level Indicators
Automatic Tank Level Gauge
AUGUST series float and tape gauge for continuous level measurement in bulk storage.
- Pressure
- Atmospheric
- Temperature
- Up to 300 °C
- Range
- Up to 20000 mm
Allied Products
Manifold Valves
Manifolds for safely isolating, blocking, bleeding and calibrating pressure instruments and transmitters.
- Pressure
- Up to 400 bar
- Temperature
- Up to 200 °C
- Connections
- NPTF, tube fitting or instrument flange, all thread types
Industries served
Wherever liquids are stored, moved or processed
Sigma instruments keep levels and flows visible and under control across a wide spectrum of industries.
- 01Chemical and petrochemical
- 02Pharmaceuticals and refineries
- 03Power plants
- 04Process industries
- 05Oil and gas exploration, storage and transport
- 06Machinery
- 07Water and wastewater treatment
- 08Environmental technology
- 09Food and beverage
- 10Fire fighting systems
Some of our patrons
Specified by the companies that build and run India
From refineries and fertiliser plants to power stations and airports, our instruments are chosen by leading owners, consultants and contractors.
Exporting to United States, Europe, Middle East and Asia Pacific
- Adani
- BHEL
- BPCL
- CPCL
- EIL
- GAIL
- HPCL
- IFFCO
- IOCL
- L&T
- MIAL
- NPCIL
- NTPC
- ONGC
- PGCIL
- Reliance
- TATA
- Technip
- Toyo
21
PDF catalogues, ready to download
Construction, options and ordering details for every instrument in the range, all in one place for your engineers and purchase team.
Request a quote
Tell us your process conditions. We will recommend the right instrument.
Share the fluid, pressure, temperature, range and connections you need, and our engineers will come back with a solution and a quotation.
