- In the area of industrial instrumentation, a loop-powered meter, also called a 4-20 mA meter, is a common tool for measuring different process parameters.
- A 4-20 mA current loop gives it power and lets it send and receive information.
- Here, we’ll discuss about when and why you should use a loop-powered meter with analog signal loops.
We’ll also talk about its benefits and uses.
Simple and Reliable:
- Loop-powered meters are known for being simple and reliable.
- They need less wiring and are less likely to lose their signal over long distances than signs based on voltage.
- They are safe to use in dangerous places because the low current levels (4-20 mA) make it less likely that sparks or fires will happen.
- Loop-powered meters use very little power, so they can be used with batteries or in places where power isn’t always available.
- The 4-20 mA signal gives ongoing measurements in real time, so changes in the process can be dealt with right away.
- When the measurement site is located a long way from the control room or central monitoring station, loop-powered meters are the best option.
- They are frequently employed in applications related to water treatment, environmental monitoring, and oil and gas because they can send signals over long distances without suffering considerable signal loss.
- Due to their intrinsic safety, loop-powered meters are recommended in potentially explosive or hazardous environments like chemical factories, refineries, or mining activities.
- Because of the reduced risk of ignition caused by the low current levels, they are a safe option.
- Loop-powered meters are a great choice for measuring devices that need to be driven by a battery because they use minimal power.
- This is helpful for things like wireless sensor networks, remote sensor nodes, and portable instruments.
- Reduced Wiring Costs: Loop-powered meters reduce the need for wiring. Installation costs are lower because they only need two wires (plus ground, if needed) to send both power and signals.
- This is different from voltage-based systems, which need separate cables for power and signals.
- Loop-powered meters are better for sending analog signals over long distances because they are less likely to have voltage drop or electrical noise.
- This makes them good for measures of temperature, pressure, and level, where keeping the signal’s integrity is very important.
- In industrial process control systems, meters that are driven by a loop are often used.
- They give continuous info that can be used to make changes to the process in real time, making sure it runs smoothly and efficiently.
- Loop-powered meters are useful for tracking things like air quality, water quality, and emissions as part of monitoring the environment.
- Because they are reliable and can send info over long distances, they can be used to check on conditions in remote or hard-to-reach places.
- The 4-20 mA standard is used by many businesses as a common way to discuss instrumentation.
- Using meters that are powered by a loop makes it easy to standardize and add new devices to existing systems.