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Our name

Σ, the sign for a sum total

Sigma draws its inspiration from Σ, the 18th letter of the Greek alphabet, which mathematicians use to denote the algebraic sum total.

The name sums up our purpose: to serve industry by recognising and providing a sum total of fluid monitoring devices and allied instrumentation products. That is why our range runs from level gauges and tank level indicators to level and flow switches, transmitters, sight flow indicators, manifolds, valves and fittings.

Our products are recognised by leading domestic and international companies, consultants and end users, and the repeat orders we receive are the clearest measure of the confidence they place in us.

Quality management

Quality built into every process

Our processes are managed on the principles of the ISO 9001:2015 quality management system, and our products are approved for some of the most demanding plants in the country.

  • 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.

Quality policy

Sigma Instruments Company is committed to:

  1. 1

    Provide reliable, engineering based products with the desired quality and service, building the confidence that brings customers back.

  2. 2

    Uphold the highest corporate ethics of honesty and integrity with suppliers, customers, associates and co-workers.

  3. 3

    Make training an integral part of continual process improvement.

  4. 4

    Comply with all statutory and legal requirements.

Chief Operating Officer, Sigma Instruments Company

Our mark over the years

A new look for a long journey

Our logo has changed with the company, while the commitment behind it has stayed the same.

  1. The Sigma logo from 1974

    1974

  2. The Sigma logo from the 1990s

    1990s

  3. The current Sigma Instruments Company logo

    Today

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.

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