Positive Displacement Volumetric Liquid Flow Switches
Description
Positive Displacement Volumetric Liquid Flow Switches are devices designed to measure and monitor the flow of liquid by dividing the fluid into specific increments and moving it through the system. These switches are integral in ensuring accurate flow measurement by accumulating the total flow from the measured increments.
Working Principle
Positive Displacement Volumetric Liquid Flow Switches operate by directly measuring the volume of liquid passing through the device. They achieve this by dividing the fluid into discrete, measurable increments, which are then counted using mechanical or electronic techniques. This method is particularly useful for high viscosity fluids, as it provides precise flow measurements without being affected by changes in fluid density or viscosity. The direct measurement capability of these switches makes them highly reliable and accurate for various industrial applications.
Applications
These flow switches are commonly used in applications involving high viscosity fluids. Specific examples include their use in oil and gas industries for monitoring the flow of crude oil, in chemical processing plants for handling viscous chemicals, and in food and beverage industries for measuring syrup or other thick liquids. Their ability to provide accurate measurements regardless of fluid properties makes them ideal for these demanding environments.
Advantages over other Materials - Metals
Positive Displacement Volumetric Liquid Flow Switches made from materials like plastic offer several advantages over metal counterparts. Plastics are lightweight, extremely durable, and resistant to rust, making them suitable for applications where corrosion resistance is critical. Additionally, plastic materials can be used in environments that are not prone to freezing or expanding in very hot conditions, providing flexibility in various operational settings.
Limitations
One of the primary limitations of Positive Displacement Volumetric Liquid Flow Switches is their susceptibility to wear and tear due to moving parts, which can lead to maintenance challenges. They may also be less effective in applications involving very low flow rates or where the fluid contains large particulates that could obstruct the moving components.
Considerations
When selecting Positive Displacement Volumetric Liquid Flow Switches, several factors should be considered. Initial costs can vary depending on the materials and design complexity, while operating expenses may be influenced by the need for regular maintenance due to mechanical wear. Durability is generally high, especially for plastic models, but accuracy can be affected by the condition of moving parts over time. Replacement and maintenance costs should be factored into the overall lifecycle cost, as these devices may require periodic servicing to maintain optimal performance.
from Malema Sensors
The operating principle is based on a free floating magnetic piston which responds only to the motion of fluids within the line, not to static or system pressures. In the presence of fluid flow, controlled movement of the piston actuates an external hermetically sealed reed switch. This switch can... [See More]
- Meter Technology: Piston
- Mounting: In-line
- Pipe Diameter: 0.25
- End Fittings: Flare
from OMEGA Engineering, Inc.
The FL-W Series of water flow monitors can be used with flows from 1 gph up to 90 gpm. These flowmeters utilize the fluid ’s movement to actuate a swinging vane (or piston), which drives the scale pointer and triggers the signal switch. SPECIFICATIONS: Signal Switch: 3-Wire SPDT, 15 A @ 125... [See More]
- Meter Technology: Piston
- Mounting: In-line
- Pipe Diameter: 0.75 to 2.00
- End Fittings: In-line Threaded
from Bijur Delimon International
Application. Individually calibrated and adjustable, Oil Flow Meters regulate and monitor oil flow. Features. Regulate and monitor oil flow to bearings and gears. Individually calibrated and adjustable with out graphs and viscosity curves. Various flow rates available in single meters or in banks of... [See More]
- Meter Technology: Piston
- End Fittings: In-line Threaded
- Mounting: In-line
- Meter Type: Volumetric Flow Meter
from Solutions with Innovation, LLC
The F001 is a precision machined, piston type flow switch that provides unsurpassed durability and reliability. Its all brass or 316 stainless steel body is rated to 1000 psig with its internal piston the only moving part. Supplied with ¼" NPT inlet and outlet ports, the F001 can be factory... [See More]
- Meter Technology: Piston
- Meter Type: Volumetric Flow Meter
- End Fittings: In-line Threaded
- Process Media Type: Liquid
from Gems Sensors & Controls
Flow Rate Settings: Liquids - Infinite Adjustment between 0.5 GPM and 20.0 GPM; Air/Gases - See chart. Port Size: 1/2" NPT. Primary Construction Material: Brass or Stainless Steel. Setting Type: Adjustable. These externally adjustable switches are ideal for protecting machine tools from coolant flow... [See More]
- Meter Technology: Piston
- Mounting: In-line
- Pipe Diameter: 0.50
- End Fittings: In-line Threaded
from Clark Solutions
Model DOZ01 flow sensors are used wherever the flow of liquids having different viscosities must be reliably and economically measured, such as in the following cases: Central lubrication systems. Transformer oils. Aggressive/caustic liquids in the chemical industry. The model DOZ01 flow sensor with... [See More]
- Meter Technology: Oval Gear
- Mounting: In-line
- Pipe Diameter: 0.25
- End Fittings: In-line Threaded
from AW Company
304 Stainless steel or 316Ti bodies [See More]
- Meter Technology: Oval Gear
- Mounting: In-line
- Pipe Diameter: 0.25
- End Fittings: In-line Threaded
from Malema Sensors
The M-50 Series low flow, flow switches monitor increasing and decreasing flow. They utilize a single moving part which responds to fluid (liquid or gas) flowing within a system. These switches are suitable for a wide range of applications in industrial, biomedical, and OEM products. The flow... [See More]
- Meter Technology: Piston
- Mounting: In-line
- Pipe Diameter: 0.12 to 0.25
- End Fittings: In-line Threaded
from Solutions with Innovation, LLC
The F002 is a precision machined, piston type flow switch that provides unsurpassed durability and reliability. Its all brass or 316 stainless steel body is rated to 1000 psig with its internal piston the only moving part. Supplied with ¼" NPT inlet and outlet ports and a ½" NPTF... [See More]
- Meter Technology: Piston
- Meter Type: Volumetric Flow Meter
- End Fittings: In-line Threaded
- Process Media Type: Liquid
from Gems Sensors & Controls
Flow Rate Settings: Liquids 0.5 GPM to 5 GPM. Port Size: 1/2" NPT. Primary Construction Material: Polypropylene. Setting Type: Fixed. These slim, inline switches reduce pressure drop to a minimum. They incorporate a unique, dual-diameter, internal bore and piston configuration to minimize flow... [See More]
- Meter Technology: Piston
- Mounting: In-line
- Pipe Diameter: 0.50
- End Fittings: In-line Threaded
from Malema Sensors
The operating principle is based on a free floating magnetic piston which responds only to the motion of fluids within the line, not to static or system pressures. In the presence of fluid flow, controlled movement of the piston actuates an external hermetically sealed reed switch. This switch can... [See More]
- Meter Technology: Piston
- Mounting: In-line
- Pipe Diameter: 0.25 to 0.38
- End Fittings: Flare
from Solutions with Innovation, LLC
The series F003A is an adjustable flow switch installed in line with the fluid movement to monitor flow rates from .75 to 4.0 and 2.0 to 8.0 GPM. The compact and durable design allows for ease of installation and the removable bonnet assembly provides easy access for cleaning without removal from... [See More]
- Meter Technology: Spring-Loaded Shuttle Magnet
- Meter Type: Volumetric Flow Meter
- End Fittings: In-line Threaded
- Process Media Type: Liquid
from Gems Sensors & Controls
Flow Rate Settings: 0.1 GPM to 1.5 GPM. Port Size: 9/16" - 18 UNF. Primary Construction Material: Ryton ®. Setting Type: Fixed. More robust porting hubs offer better structural integrity. Molded cable grommet offers improved moisture protection. The FS-4 Series makes flow protection economical... [See More]
- Meter Technology: Piston
- Mounting: In-line
- Pipe Diameter: 0.56
- End Fittings: In-line Threaded
from Gems Sensors & Controls
Flow Rate Settings: Liquids - 0.1 GPM to 1.5 GPM; Air/Gases - see chart. Port Size: 1/4" NPT. Primary Construction Material: Brass or Stainless Steel. Setting Type: Fixed. This series of precision-calibrated switches provide reliable and consistent performance; repeatability is within 1%. FS-925... [See More]
- Meter Technology: Piston
- Mounting: In-line
- Pipe Diameter: 0.25
- End Fittings: In-line Threaded
from Gems Sensors & Controls
Flow Rate Settings: Liquids - 50-300 cc/min.; Air/Gases - See Chart at Bottom of Page. Port Size: 1/4" NPT. Primary Construction Material: Brass or Stainless Steel. Setting Type: Fixed. These switches provide accurate detection of excessive or insufficient flow rates in such applications as:... [See More]
- Meter Technology: Piston
- Mounting: In-line
- Pipe Diameter: 0.25
- End Fittings: In-line Threaded
from Gems Sensors & Controls
Flow Rate Settings: 0.10 GPM to 1.50 GPM. Port Size: 1/4" NPT. Primary Construction Material: Brass, Stainless Steel. Setting Type: Fixed. Measuring only 1" x 2-3/4" (25 mm-70 mm), these compact switches are ideal for use where space is at a premium. Designed for use with water and oil, these... [See More]
- Meter Technology: Piston
- Mounting: In-line
- Pipe Diameter: 0.25
- End Fittings: In-line Threaded
from Gems Sensors & Controls
Flow Rate Settings: 0.25 GPM to 2.00 GPM. Port Size: Multiple. Primary Construction Material: Brass or Stainless Steel. Setting Type: Fixed. These rugged inline flow switches use 100 micron filtration and are less susceptible to clogging than other high-pressure inline flow switches. The one-piece... [See More]
- Meter Technology: Piston
- Mounting: In-line
- Pipe Diameter: 0.38 to 0.50
- End Fittings: Compression; In-line Threaded
from Gems Sensors & Controls
Low Pressure Drop Design. Flow Rate Settings: 0.25 GPM to 2.00 GPM. Port Size: 3/8" NPT Male and 1/4" Quick Disconnect (QDC) Male. Primary Construction Material: Polypropylene. Setting Type: Fixed. This rugged inline flow switch offers the same superior performance and resistance to clogging as its... [See More]
- Meter Technology: Piston
- Mounting: In-line
- Pipe Diameter: 0.25 to 2.75
- End Fittings: In-line Threaded
from Gems Sensors & Controls
Flow Rate Settings: 0.1 GPM to 1.0 GPM. Port Size: 1/4" NPT. Primary Construction Material: Brass. Setting Type: Fixed. A unique, patented piston design assures accuracy within 20% over a full range of viscosities - from 40 to 1000 SSU. Ideal for use in applications where liquids of different... [See More]
- Meter Technology: Piston
- Mounting: In-line
- Pipe Diameter: 0.25
- End Fittings: In-line Threaded
from Gems Sensors & Controls
Flow Rate Settings: 0.50 GPM to 3.00 GPM. Port Size: 1/2" NPT, 3/4" NPT, 1/2" Tube Compression Fitting. Primary Construction Material: 316 Stainless Steel. Setting Type: Fixed. The FS-480 large-body inline flow switch delivers ample flow rates with minimal pressure drop. 25% larger than its FS-380... [See More]
- Meter Technology: Piston
- Mounting: In-line
- Pipe Diameter: 0.38 to 0.50
- End Fittings: Compression; In-line Threaded