Gas Velocity Flow Switches
Last Updated: April 1, 2025
Description
Gas velocity flow switches are devices designed to monitor and control the flow of gas within a system. They detect the velocity of gas flow and provide a signal to activate or deactivate equipment, ensuring that the flow remains within desired parameters.
Working Principle
Gas velocity flow switches operate by sensing the speed of gas moving through a system. They typically use technologies such as differential pressure or thermal dispersion to measure flow velocity. These switches are useful because they can provide real-time monitoring and control, helping to maintain system efficiency and prevent damage from irregular flow conditions. By detecting changes in flow velocity, they can trigger alarms or control mechanisms to adjust the system as needed.
Applications
Gas velocity flow switches are commonly used in HVAC systems to monitor air flow and ensure efficient operation. They are also employed in natural gas fractionation facilities to monitor relief valve leaks, where precise detection of low gas velocities is crucial to prevent false alarms and ensure safety . Additionally, they are used in cooling towers to protect against fluid delivery pump failures by detecting flow conditions and triggering alarms or shutdowns as necessary .
Advantages over other Materials - Plastics and Polymers
While the documents do not provide specific advantages of gas velocity flow switches over plastics and polymers, it is generally understood that these switches, often made from metals or other durable materials, can withstand higher temperatures and pressures compared to plastic components. This makes them suitable for demanding industrial applications where plastics might fail.
Limitations
One limitation of gas velocity flow switches is their potential inaccuracy at low flow rates, as seen with some ultrasonic flow switches . Additionally, certain technologies like differential pressure meters may not effectively detect very low gas velocities, leading to potential false alarms or missed detections .
Considerations
When selecting a gas velocity flow switch, several factors should be considered. Initial costs can vary depending on the technology and materials used. Operating expenses may include energy consumption and maintenance requirements. Durability is a key consideration, as switches must withstand the operating environment's conditions, including temperature and pressure. Accuracy is crucial, especially in applications requiring precise flow monitoring. Replacement and maintenance costs should also be evaluated, as some technologies may require more frequent servicing or part replacements.
from Sierra Instruments, Inc.
Overview. The InnovaSwitch insertion-type level switch is a high-performance, industrial-grade liquid level indicator for tanks and process vessels. This product switches on level changes as small as 0.03 inch (0.8 mm) on dry-to-wet and wet-to-dry occurrences in a tank or vessel. The instrument was... [See More]
- Process Media Type: Liquid; Gas
- Mounting: Insertion
- Meter Technology: Thermal
- End Fittings: In-line Threaded
from Fluid Components Intl. (FCI)
The FLT93C insertion and inline type FlexSwitches for sanitary flow, level and temperature monitoring represents the first true technological breakthrough in thermal technology in over a decade. This product is specifically designed for sanitary 3A process applications. FCI is the only thermal... [See More]
- Process Media Type: Liquid; Gas
- Mounting: Insertion
- Meter Technology: Thermal
- End Fittings: In-line Flanged
from Fluid Components Intl. (FCI)
FCI ’s AS-FS Dual Output flow sensor provides fully redundant and separate outputs in the same outline dimension envelope of single sensor output designs. This is achieved by employing two electrically independent sensor heads and circuit boards; the second output assures continued operation... [See More]
- Process Media Type: Liquid; Gas
- Mounting: Insertion
- Meter Technology: Thermal
- End Fittings: In-line Flanged
from Fluid Components Intl. (FCI)
FCI's AS-FS Series flow switches utilize no moving parts, ultra-reliable thermal dispersion flow measurement technology to detect a flow rate above or below a predetermined set point at the sensing location. They are applied to signal low flow or high flow alarm conditions in air or liquid fluid... [See More]
- Process Media Type: Liquid; Gas
- Mounting: Insertion
- Meter Technology: Thermal
- End Fittings: In-line Flanged
from Shanghai Yuanben Magnetoelectric Tech. Co., Ltd.
Particular Introductio. 1. Describtion. FSP series paddle flow switches is made of reed swiches, PP switches housing and brass body, SUS304 paddle, the flow switches can be adjustable in line, changed the switches from N.O. to N.C. also you may changed the setting flow ratting. FSP series paddle... [See More]
- Process Media Type: Liquid; Gas
- End Fittings: In-line Threaded
- Meter Technology: Paddlewheel
- Operating Pressure: 1000 to 2000
from Bionetics
Rheotherm flow sensing probes for duct gases are easy to install and provide long-term service with little or no maintenance. The output can be in mass, standard volume or velocity units. Options for hazardous locations (intrinsically safe/explosion-proof) are available. [See More]
- Process Media Type: Liquid; Gas
- Pipe Diameter: 1.00 to ?
- Meter Technology: Thermal
- Mounting: Insertion
from Sitron
The CF12 Thermal Dispersion Flow Switch with Exproof Housing (GX) comes standard with a Universal Power Supply: 24Vdc or 85 to 264Vac. This unit offers reliable liquid and gas flow detection ideally suited for just about any Flow/ No Flow application. Unlike the CF12 with either the small nylon... [See More]
- Process Media Type: Liquid; Gas
- Mounting: Insertion
- Pipe Diameter: 0.50 to 2.00
- End Fittings: In-line Flanged; In-line Threaded
from KOBOLD Instruments, Inc.
Product Features. Adjustable Switchpoint. Micro Switch Rated to 15 Amps. Install in Vertical or Horizontal Ducts. KOBOLD LPS air flow switches are widely used to control flow setpoints in HVAC applications. In addition to being robust, they have the added benefit of being inexpensive as well. The... [See More]
- Process Media Type: Gas
- Mounting: Insertion
- Meter Technology: Paddlewheel
- End Fittings: In-line Flanged
from OMEGA Engineering, Inc.
The FST1000 Series measures air velocity and provides two SPST alarm contact closures corresponding to high and low alarm set points. The alarm set points are adjustable from 0 to 100% of the air flow range. The unit comes with a green power LED, and two red LEDs for high and low alarm indications. [See More]
- Process Media Type: Gas
- Velocity Flow Rate: 0.0 to 167
- Mounting: Insertion
- Accuracy: 2
from Bionetics
Rheotherm flow switches provide reliable switch protection in all types of liquid or gas service. From critical monitoring of extremely low flow process additives to loss of flow protection in large water or air lines, we can handle most flow switch applications. With no moving parts, long term... [See More]
- Process Media Type: Liquid; Gas
- Pipe Diameter: 0.06 to 1.00
- Meter Technology: Thermal
- Mounting: In-line; Insertion
from Sitron
The CF12RM Remote Mounted Thermal Dispersion Flow Switch is available in two versions: CF12RMDC (+/-24Vdc) or CF12RMAC (85 to 264Vac). Both of these models offer reliable liquid and gas flow detection ideally suited for just about any Flow/ No Flow application, with the flexibility of separate panel... [See More]
- Process Media Type: Liquid; Gas
- Mounting: Insertion
- Pipe Diameter: 0.50 to 2.00
- End Fittings: In-line Flanged; In-line Threaded
from Sitron
The CF12 Thermal Dispersion Flow Switch with a large 316 Stainless Steel housing (A2) comes standard with a Universal Power Supply: 24Vdc or 85 to 264Vac. This model is an excellent alternative when either plastic or aluminum is not recommended. The CF12 (A2) offers reliable liquid and gas flow... [See More]
- Process Media Type: Liquid; Gas
- Mounting: Insertion
- Pipe Diameter: 0.50 to 2.00
- End Fittings: In-line Flanged; In-line Threaded