Product Overview
Used Sierra Instruments 840 Series Mass Flow Controller – Model 840-M-1-V1, 0–30,000 SCCM Air
The Sierra Instruments 840 Series mass flow controller is a high-capacity gas flow control device engineered for precision and reliability. This model, 840-M-1-V1, is configured for air and measures up to 30,000 standard cubic centimeters per minute (SCCM), providing accurate flow regulation for laboratory, process, and industrial applications.
Sierra Instruments has been a trusted name in gas flow measurement and control since the 1970s, known for integrating advanced thermal mass flow technology into robust, serviceable designs. The 840 Series reflects that legacy—high-accuracy performance built into a compact, rugged instrument body.
Product Condition
Used, in excellent cosmetic condition with minor scuffs and light surface wear from handling and storage. This unit has not been tested. Based on visual inspection, it appears complete and well maintained.
Product Overview
The 840 Series employs Sierra’s thermal mass flow sensing principle to measure and control gas flow without the need for temperature or pressure compensation. The Model 840-M-1-V1 is factory-calibrated for air and designed for analog or digital integration into automated control systems. Its stainless-steel body, precision sensor, and internal valve assembly ensure long-term stability and repeatable accuracy in demanding test or process environments.
Key Features
- Model: 840-M-1-V1 (Sierra 840 Series)
- Flow range: 0–30,000 SCCM (air)
- Gas type: Air (factory calibration)
- Thermal mass flow measurement and control
- Integrated control valve for proportional regulation
- Analog output for flow signal monitoring
- Stainless steel body and precision sensor construction
- Compact design for bench or rack integration
- Designed for laboratory and process control use
- Manufactured by Sierra Instruments, a leader in gas flow technology
Applications
- Laboratory gas flow control
- Process automation and gas blending systems
- Calibration and test benches
- Environmental simulation chambers
- Semiconductor and research facilities
- Industrial gas monitoring and control
- System restoration or equipment upgrade projects
Frequently Asked Questions
Is this unit tested?
No, it has not been tested. It is sold based on visual inspection only.
What gas is it configured for?
This controller is factory-calibrated for air, with a flow range of 0–30,000 SCCM.
Can it be recalibrated for other gases?
Yes. Sierra flow controllers can be recalibrated by the manufacturer or qualified labs for other gases and ranges.
What kind of signal output does it provide?
Typically analog voltage or current output proportional to flow rate, depending on configuration.
Is this controller complete?
Yes, it appears complete and intact, but has not been tested under power or flow conditions.
Born from Sierra’s long tradition of precision flow control, this 840 Series controller remains ready to measure, manage, and steady the stream of air in its next system build.
