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Brand
Sierra Instruments
Sierra Instruments is an American maker of gas and liquid flow measurement and control instruments, best known for thermal mass flow meters. It was founded in 1973 by Dr. John Olin and a colleague, both formerly of Thermo Systems Inc., and moved to the Monterey area of California in 1975. Sierra was family-owned until the TASI Group acquired it in 2019. Seven Star LLC sources and supplies Sierra thermal mass flow meters and controllers for plants in Oman, including the QuadraTherm, SmartTrak and FastFlo models listed on this page.
Read the full brand profile- 8 products
- 2 categories
Brand profile
About Sierra Instruments
- Founded
- 1973
- Headquarters
- Monterey, USA
- Speciality
- Thermal mass flow meters and controllers
- Listed with us
- 8 products in 2 categories
Sierra Instruments is an American maker of gas and liquid flow measurement and control instruments, best known for thermal mass flow meters. It was founded in 1973 by Dr. John Olin and a colleague, both formerly of Thermo Systems Inc., and moved to the Monterey area of California in 1975. Sierra was family-owned until the TASI Group acquired it in 2019.
Seven Star LLC sources and supplies Sierra thermal mass flow meters and controllers for plants in Oman, including the QuadraTherm, SmartTrak and FastFlo models listed on this page.
Sierra Instruments company profile
| Founded | 1973, Minnesota, USA |
|---|---|
| Founder | Dr. John Olin and a fellow former Thermo Systems Inc. engineer |
| Headquarters | Monterey, California, since 1975 |
| Ownership | TASI Group, since 2019 |
| Product families | QuadraTherm 640i and 780i thermal mass flow meters, BoldFlo thermal meters, InnovaMass vortex meters, InnovaSonic ultrasonic meters, SmartTrak and MaxTrak mass flow controllers, flow calibration systems |
Milestones
- 1973: Sierra Instruments is founded.
- 1975: The company moves to the Monterey area.
- 1977: John Olin takes full ownership.
- 2019: The TASI Group acquires Sierra.
- 2023: Sierra marks 50 years.
Sierra product families listed here
The QuadraTherm 640i is an insertion thermal mass flow meter for air and gas in larger pipes and ducts. Its inline counterpart, the 780i, has built-in flow conditioning. SmartTrak 100 is a digital mass flow meter and controller for multiple gases, used on lower flows in laboratories, skids and gas blending. FastFlo 620S is a fast-response insertion sensor for air flow in pipes. Sierra also builds InnovaMass vortex meters for steam, gas and liquid.
Sierra Instruments products we list
Ordering Sierra flow meters: what we need
Send the full model code from the nameplate, or the serial number. For a new meter we need the gas or gas mixture, flow range, line pressure and temperature, pipe size and schedule, process connection, supply voltage, output signal and any hazardous-area approval the site requires. Projects in the GCC often ask for the factory calibration certificate, so say so in the inquiry.
Facts checked against Sierra's own 50th anniversary release (sierrainstruments.com), October 2026.
Sierra Instruments products by category
Request a Quote for Sierra Instruments Products
Looking for Sierra Instruments parts not listed here, or pricing for a project? Send us the part numbers and quantities. Seven Star LLC sources genuine Sierra Instruments products for customers across Oman and the GCC and replies with a formal quotation.
- Genuine OEM products
- Supply across Oman & the GCC
- Formal quotation from our sales team
Free, no-obligation quotation · takes about 1 minute
Other enquiries: [email protected] · WhatsApp
FAQ
Questions about Sierra Instruments
Common questions about Sierra Instruments equipment, part numbers and supply to Oman and the GCC.
01What is the difference between the Sierra QuadraTherm 640i and 780i?
Both are thermal mass flow meters for air and gas. The 640i is an insertion probe that goes into an existing pipe or duct through a fitting, which suits larger line sizes. The 780i is an inline meter with a flow body and built-in flow conditioning, chosen for smaller lines or where straight pipe run is limited.
02Is the SmartTrak 100 a meter or a controller?
Sierra offers the SmartTrak 100 in both forms. The meter version only measures gas mass flow, while the controller version adds an integral control valve that holds the flow at a setpoint. The two look similar, so read the model code on the label and tell us which one you have before we quote.
03What data does Sierra need to size a thermal mass flow meter?
A thermal meter is calibrated for a specific gas. We need the gas composition, minimum, normal and maximum flow, operating pressure and temperature, and the pipe inside diameter. For an insertion meter, also give the pipe wall thickness and the connection type so that the probe length can be selected correctly.
04Which Sierra meter is meant for steam?
Thermal meters such as QuadraTherm are for air and gases. For steam, Sierra lists the InnovaMass vortex meters, the inline 240S and the insertion 241S, which also handle gas and liquid. If your duty is steam, send the pressure, temperature and flow range and we check the right InnovaMass configuration.
05Is Seven Star LLC a distributor of Sierra Instruments?
No. Seven Star LLC is an independent industrial supplier based in Muscat. We source Sierra Instruments flow meters and controllers through commercial channels, check the model or order code against the manufacturer's documentation before quoting, and provide the manufacturer's datasheet and the certificates the manufacturer issues with the order on request.