Flow Transmitters
Flow transmitters are used in the oil and gas industry, as well as in water treatment and chemical processing, to measure the volumetric or mass flow rate of liquids or gases through a pipeline or process. These devices work in conjunction with flow meters to provide real-time data on a system's flow rate. The transmitters take the flow measurements and convert them into an electrical signal. This signal can then be used for control, display, or further processing as part of the monitoring system, which is vital for many applications in these industries where precise control and measurement of flow rate are necessary.
Common direct pressure flow meters, as well as mass and ultrasonic flow meters, can be used with flow transmitters to monitor flow in real time. These devices measure one of three things to determine the flow rate: pressure drop, fluid velocity, or sound waves. These are called "primary elements," and they are often used with differential pressure transmitters to make sure the measurement is accurate.
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FAQs
How is a flow meter used in conjunction with a flow transmitter to obtain a flow measurement and volumetric flow rate?
A flow meter measures the fluid's flow rate, and the flow transmitter converts this measurement into an electrical signal, allowing for real-time monitoring of the flow measurement and volumetric flow rate in a system.
Transmitters vs Transducers
Some of the most common types of transmitters and transducers can be found on pressure instruments. Examples of these include: drop-in well pressure devices and devices that measure the pressure in a pipe or gas chamber. Transmitters and transducers can also be found on flow and speed measurement devices.
What is the difference between transmitters and transducers?
The main difference is the way they send data to the monitoring device, like a PLC. In terms of measurement, the transmitter will reference a measuring unit by sending a milliamp signal (such as 4-20 mA). A transducer will reference a measuring unit by sending a voltage signal, typically in volts or millivolts.
Why have the two different types of transmission methods?
The method will depend on the application. If the electrical connection in the application travels a short distance, a pressure transducer is the better choice. Pressure transducers are smaller with fewer active electronic components that can be upset by electromagnetic interference. Also, the voltage signals transmitted over longer distances are subject to voltage drop and signal corruption. A transmitter is better for transmitting signals over a long distance.