Used Flow Instruments

JM Industrial buys and sells surplus and used industrial flow instruments from leading manufacturers in various specifications. You can buy flow instruments from brands like Endress+Hauser Inc., Emerson, Schenck Accurate, Rosemount, and more. Flow instruments are an integral part of several processing units across industries. They are mechanical devices that can measure and monitor the flow rate of liquids or gases. Being one of the renowned suppliers in the industry, JM Industrial stocks various types of used Instruments for sale. If you have any questions, please get in touch with us.

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Types of Used and Surplus Flow Instruments Offered by JM Industrial

Our inventory comprises a variety of used flow meters for sale. Here are some popular types of flow instruments we have.

  • Magnetic Flow Meters: Popularly called electromagnetic flow meters, they are used to measure the flow rate of electrically conductive fluids such as acids, slurries, water, pulp, and more. At JM Industrial, we offer used magnetic flow meters that offer reliable performance in several challenging applications. Rosemount magnetic flow meter is our catalog product. You can buy surplus or used Rosemount flow meters as per your requirements.
  • Mass Flow Meters: These meters are designed to measure the mass flow rate of fluids or gases passing through the closed systems. We offer mass flow meters from top brands.
  • Vortex Flow Meters: These flow meters measure the fluid flow rate by detecting the frequency of vortices that are generated when the fluid flows past an obstruction, such as a bluff body, in a closed system. JM Industrial stocks various types of used vortex flow meters for sale.
  • Air Flow Meters: As the name implies, air flow meters are used to measure the rate of air flowing through a duct or pipe. Our airflow meters are made of high-quality aluminum with a non-clog airstream.

Aside from the aforementioned flow meters, we also stock Endress Hauser Flow Meters, which are ideal for most industrial applications. You can buy used flow meters in a good condition from JM Industrial at competitive prices.

How to Calibrate a Flow Meter?

Calibrating a flow meter ensures accurate measurements and reliable performance. The process involves comparing the readings from the flow meter to a known standard and adjusting the meter as necessary. However, the calibration process may vary depending on the flow meter type being used as well as the manufacturers recommendations. Here are the general steps for calibrating a flow meter.

  • Step 1 - Set up the flow meter in accordance with the manufacturers instructions and connect it to a test rig or a flow loop. The test rig should have a flow standard with a known flow rate that can be used for comparison.
  • Step 2 - Adjust the flow rate of the test rig to a known value and record the corresponding reading from the flow meter.
  • Step 3 - Repeat the previous step for several different flow rates, covering the full range of the flow meters capabilities.
  • Step 4 - Compare the readings from the flow meter to the known flow rates and calculate the error for each measurement. The error is the difference between the measured value and the known value.
  • Step 5 - Adjust the flow meter to reduce the error to an acceptable level. This may involve adjusting the calibration coefficients, changing the meters settings, or physically adjusting the meter itself.
  • Step 6 - Repeat steps 2-5 until the flow meter is accurately calibrated across its full range.
  • Step 7 - Document the calibration process and results in accordance with the industry standards and the manufacturers guidelines.

Factor Considerations While Selecting Flow Meters

There are several factors to consider when selecting flow meters for applications. Some of the key factors to consider include:


  • Fluid Type and Properties: The fluid being measured can impact the choice of the flow meter. Factors such as viscosity, density, corrosiveness, and temperature can affect the meters accuracy and performance.
  • Flow Range: The flow range of the meter should match the flow rate of the application. Its important to choose a meter that can handle the maximum and minimum flow rates that will be encountered.
  • Accuracy: The required level of accuracy will depend on the application. Some applications require high accuracy, while others may have more lenient requirements.
  • Installation requirements: Consider the available space for installation, the type of piping or conduit, and any other installation requirements, such as orientation or accessibility.
  • Environmental factors: The operating environment can also affect the choice of a flow meter. Consider factors such as temperature, pressure, humidity, and the presence of hazardous materials.
  • Cost: The cost of the meter should be balanced against the other factors to ensure that the meter provides the required performance and is reliable.

How Are Flow Meters Different from Flow Transmitters?

While flow meters and flow transmitters are similar in terms of their use in measuring fluid flow rates, there are a few key differences between the two.

  • Output Signal: Flow meters typically provide a direct measurement of the flow rate, while flow transmitters provide a standardized output signal, such as 4-20 mA, that can be easily transmitted over a distance and integrated into a control system or data logger.
  • Signal Conditioning: Flow transmitters typically include signal conditioning circuitry that processes and conditions the output signal from the flow meter. Flow meters may not have such circuitry.
  • Integration with Control Systems: Flow transmitters are often designed to be integrated into control systems, such as SCADA or PLCs, while flow meters may not be designed for such integration.
  • Cost: Flow transmitters are typically more expensive than flow meters due to the added signal conditioning circuitry and integration capabilities.
  • Applications: Flow meters may be suitable for applications where a direct measurement of the flow rate is sufficient, while flow transmitters are often used in process control and monitoring applications where real-time flow rate measurement and integration with control systems are required.

What Are the Benefits of Flow Rate Measurement?

Flow rate measurement offers several benefits. Here are some of them.

  • Process Control: Flow rate measurement is essential for maintaining consistent process control in various industrial applications. Accurate flow rate measurement ensures that the required amount of material flows through the system at the right rate, which helps prevent defects or product quality issues.
  • Efficiency Improvement: Accurate flow rate measurement can help optimize the flow of materials and reduce waste, which can improve the overall efficiency of the process. This is particularly important in industries such as chemical processing, where even small improvements in efficiency can translate into significant cost savings.
  • Cost Savings: Flow rate measurement can help identify leaks, blockages, or other issues that can result in wasted material, energy, or other resources. Identifying and addressing these issues can help reduce costs and improve the overall profitability of the operation.
  • Safety: In industries where hazardous or toxic materials are handled, accurate flow rate measurement is essential for ensuring the safety of workers and the environment. Accurate flow rate measurement can help prevent spills or leaks, which otherwise can have serious consequences.
  • Compliance: Many industries are subject to regulations that require accurate flow rate measurement and reporting. Accurate flow rate measurement and complying with industry standards can help avoid costly fines and legal issues.

Applications of Flow Meters

Flow meters are used in a variety of applications. Here are some important ones.

  • Water and Wastewater Management
  • Chemical and Petrochemical
  • Oil and Gas
  • HVAC Systems
  • Food and Beverages
  • Power Generation
  • Aerospace
  • Automotive
  • Pharmaceuticals
  • Biotech

JM Industrial is the leading reseller of used and surplus instruments in the United States including Flow Instruments, Level Instruments, Pressure Instruments, Temperature Instruments and other. Customer satisfaction is our priority. We consign, buy, and sell used flow meters and other industrial equipment. We unite many industry-leading buyers and sellers across the US. For more details, contact our experts. They will come up with a possible solution.

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