Audible or Visual Alarms Volumetric Liquid Flow Switches
Description
Audible or Visual Alarms Volumetric Liquid Flow Switches are devices designed to monitor the flow of liquids within a system. They provide alerts through audible or visual signals when the flow rate deviates from a predetermined setpoint, ensuring that operators are informed of any changes in flow conditions.
Working Principle
These flow switches operate by detecting changes in the flow rate of a liquid. They typically use either solid-state or electromechanical switches to monitor flow conditions. When the flow rate falls below or exceeds a set threshold, the switch triggers an alarm. This functionality is crucial for preventing equipment damage, such as pump overheating, by alerting operators to take corrective action. The dual alarm capability, as seen in some models, allows for both pre-warning and immediate shutdown alerts, enhancing safety and operational efficiency .
Applications
Volumetric liquid flow switches are used in various applications, including cooling tower systems to protect pumps from dry-running conditions. They are also employed in refinery operations to monitor water and wastewater control, ensuring that flow conditions remain within safe limits .
Advantages over other Materials - Metals
Plastic materials used in some volumetric liquid flow switches offer advantages over metals, such as resistance to corrosion and rust. This makes them suitable for applications where the media is not prone to freezing or expanding in extreme temperatures. Additionally, plastic is lightweight yet durable, providing a cost-effective alternative to metal components .
Limitations
One limitation of some flow switches, particularly ultrasonic types, is their reduced accuracy at low flow rates. Additionally, mechanical flow switches can be susceptible to wear and corrosion, which may affect their long-term reliability and performance .
Considerations
When selecting a volumetric liquid flow switch, several factors should be considered. Initial costs can vary depending on the type of switch and materials used. Operating expenses may include maintenance and potential replacement costs due to wear or corrosion. Durability and accuracy are critical, especially in applications with harsh environmental conditions. Solid-state switches, while more expensive, offer faster switching and longer life spans compared to electromechanical options .
from Fluid Components Intl. (FCI)
The FS10A is a universal flow monitor and switch specifically designed for gas and liquid process analyzer sampling systems. The FS10A is a fast responding, highly repeatable sensor which installs easily into a standard tube tee fitting or new SP76 (NeSSI) modular manifold. The FS10A utilizes proven... [See More]
- Features: Built-in Alarm Indicator
- Pipe Diameter: 0.25 to 0.50
- Meter Technology: Thermal
- Mounting: Insertion
from Proteus Industries Inc.
Proteus 8000 Series instruments provide accurate, rugged, reliable and cost-effective measurement of heat transfer fluids and other liquids from -40 to 90 °C. Customized versions can be adapted for use with liquid temperatures to 150 °C and above. A built-in relay can be used to sound an... [See More]
- Features: Built-in Alarm Indicator
- Mounting: In-line
- Meter Technology: Paddlewheel
- End Fittings: In-line Threaded
from Malema Sensors
The M-100X Series is an extremely sensitive flow switch. This has been engineered to monitor vital sample flow parameters for instrumentation in process control and inert blanket gases. It is used as an auxiliary alarm monitor for flow meters and is ideally suited for applications when installed on... [See More]
- Features: Built-in Alarm Indicator
- Mounting: In-line
- Pipe Diameter: 0.12 to 0.25
- End Fittings: In-line Threaded
from OMEGA Engineering, Inc.
The FSW301 flow switch comprises a paddle system (1) with a permanent magnet attached (2). Above that magnet is a reed contact (3), located outside the flow of fluid. A second magnet with opposing poles (4) creates the force necessary to reset the switch back to the no flow position. When the... [See More]
- Features: Built-in Alarm Indicator
- Pipe Diameter: 0.50 to 8.00
- Meter Technology: Paddlewheel
- Mounting: In-line
from Brooks Instrument
Features. Wide range of flow ratings. Operating temperature range 33 to 125 °F (1 °C to 52 °C). Pressure ratings up to 500 psig / 34 bar. Two accuracy levels to choose from: 2% or 1% Full Scale. Optional high and low-flow reed switch or inductive alarm, also for safe use in explosive... [See More]
- Features: Built-in Alarm Indicator
- Mounting: In-line
- Meter Technology: Rotameter; Variable Area
- End Fittings: In-line Threaded
from Malema Sensors
AD-15/ADI-15/ADT-15 series flow switches can be fitted with local flow indicators. AD series flow switches can be used for monitoring liquid and gas flows. Features. Can be mounted vertically or horizontally. Alarms : Reed switch. Analog Output : 4-20mA transmitter (ADT-15 only). It does not need... [See More]
- Features: Built-in Alarm Indicator
- Meter Type: Volumetric Flow Meter
- Mounting: In-line
- Process Media Type: Liquid; Gas
from OMEGA Engineering, Inc.
The FSW301 flow switch comprises a paddle system with a permanent magnet attached. Above that magnet is a reed contact, located outside the flow of fluid. A second magnet with opposing poles creates the force necessary to reset the switch back to the no flow position. When the monitored flow pushes... [See More]
- Features: Built-in Alarm Indicator
- Pipe Diameter: 0.75 to 8.00
- Meter Technology: Paddlewheel
- Mounting: Insertion
from Brooks Instrument
Reliable and affordable, MT3600 metal tube variable area flow meters satisfy the operational and reliability requirements for multiple industrial purge meter applications, such as metering coolants, pump seal fluids, lubricants under pressure and opaque fluids. Featuring high-temperature and... [See More]
- Features: Built-in Alarm Indicator
- Mounting: In-line
- Meter Technology: Rotameter; Variable Area
- End Fittings: In-line Threaded; ANSI 150# RF
from OMEGA Engineering, Inc.
OMEGA ® in-line flowmeters offer high accuracy flow rate indication for oil or water and the ability to either control the flowrate or alarm on high or low flowrates. These units feature an SPDT switch which can be triggered at any point along the flow range. [See More]
- Features: Built-in Alarm Indicator
- Mounting: In-line
- Pipe Diameter: 0.50 to 0.75
- End Fittings: In-line Threaded
from Brooks Instrument
Need reliable, durable flow measurement in high-pressure, high-temperature or hazardous process settings? The MT3750 metal tube variable area flow meter from Brooks Instrument is your hard-working answer. Constructed from high-strength steel, the MT3750 Series VA flow meter features a compact design... [See More]
- Features: Built-in Alarm Indicator
- Mounting: In-line
- Meter Technology: Rotameter; Variable Area
- End Fittings: Compression; In-line Threaded