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A panel meter is an instrument that displays an input signal in either a digital or analog form. Many panel meters also include alarm options as well as the ability to connect and transfer data to a computer.
OMEGA's iSeries panel meters are available with an ethernet option which allows the panel meter reading to be accessed across a local area network (LAN) or even through the internet.
Standard SizesSince panel meters are generally mounted inside an instrument panel, the panel must be cut to accommodate the panel meter. In order to provide interchangeability between panel meters, most panel meters are designed to standard DIN sizes.
The most common DIN sizes are shown below. Temperature and Process Panel Meters The most common types of panel meter is one that accepts a single input and provides a digital display of the signal. These meters typically accept inputs from temperature sensors such as thermocouples and RTDs as well as process signals such as 4-20 mA, 0-5 Vdc and 0-10 Vdc.
Totalizers A totalizer is a type of panel meter that provides a summation over time of the input signal. Totalizers are commonly used with pulse inputs to provide a count of the number of pulses. This is typically used in flow measurement applications.
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Large Display Panel Meters Large display panel meters are commonly used when the display must be visible at a distance.
OMEGA's ILD series features digits as large as 4 inches in height. Benchtop Meters OMEGA offers panel meters built into a benchtop case. The benchtop case provides portability and is commonly used in laboratory applications. Wallmount Meters For those applications where a panel is not available, OMEGA also offers wall mount indicators.
The benchtop case provides portability and is commonly used in laboratory applications. Analog Meters At one time most meters were analog style, however, with the advent of digital technology analog meters have become rare.
Analog meters are dial type gauges, like the speedometer in most cars. However there are some applications which still dictate analog meters. Related ProductsLearn more about the DPPT_SeriesPLATINUM™ Series Universal Input Digital Panel MetersOrder Now. What is a cold junction compensation for a thermocouple probe?
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Red Lion manufactures high quality solutions for your digital and analog panel meter requirements. Our portfolio offers you a wide range of models, sizes and capabilities — from our indicators, to our versatile process meters with communication, you have the ability to add or change capabilities with plug-and-play, field-installable cards.
Meters for Any Application.
Display Height .3” (7.6 mm) to 4" (101 mm). Digital Meters: count, rate, time. Analog Meters: current, process, resistance, strain gage, temperature, voltage. PID Control: current, process, temperature, voltage.
Outputs: relay, solid state, retransmitted analog.
Various communication protocols.
Field-installable option cards for changing business needs. Easy-to-use powerful capabilities of Crimson® software.
For 21 consecutive years the readers of Control Design Magazine have voted Red Lion the number one panel meter manufacturer in the industry.
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This tool will help you decide which product is the closest match and has the right features or options for all your needs. We know you’ll love our panel meters.
In fact, you can trade in your panel meter for a free Red Lion one.Click Here to learn more about the Panel Meter Trade In Program. Panel Meters for any Applicationfrom the Leading Panel Meter Brand.
Our high quality panels are varied and versatile, able to meet a wide range of needs with an even wider range of capabilities—and we’re ready to tackle your challenges.
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Choose the right panel meter for your application
To put it simply, these are the number of digits that can be displayed in the panel meter.
3.5 or 3-1/2 means it can display readings on the screen for up to 199.9
4.5 or 4-1/2 means it can display readings on the screen for up to 1999.9
Unlike analog panel meters that do not need a power source, digital panel meters require a power source for its function.
Digital panel meters use an electric circuit to convert analog input to a display input. Despite other digital panel meters claiming that they are “self-powered” or “self-contained,” they still need some kind of power source in order to function.
Depending on where and how would you use the digital panel meter, you should also assess the conversation rate per second. This way, you would be able to determine which type of digital panel meter you should buy.
Accuracy for digital panel meters is usually between 0.01% to 1% of reading. This type of panel requires less interpolation because of its digital display.
These functionalities are not common in the most basic digital panel meter; they are mostly present in new models of digital panel meters.
Setpoints and alarms feature allows you to set limits on your panel meter. When the input reaches the setpoint, it will then trigger a visual or audio alarm. This added feature is a must-have for those who want to control and maintain their process parameters.
Adjustable display as we previously mentioned, some digital panel meters are customizable and can be adjusted to show different displays. This added feature is highly recommended for hobbyists that do not necessarily use their panel meter on a wider or industry scale.
USB Port is not the most common feature of a digital panel meter, but it is especially used in different industries because it allows you to store and archive all the readings on a computer.
The basic principle of any panel meter is quite simple, which is to measure and provide a visual countable representation.
Like any panel meter, digital panel meters work the same way. The only difference it has over the analog panel meter is the way it displays input and readings.
Scaling is one of the main functions of a digital panel meter. It converts the signal output from various sensors into a physical measurement unit.
As we mentioned before, a digital panel meter is able to measure and display different inputs and units. However, there are several steps that you need to do in order to measure and display different inputs effectively.
For example, you need to use or install other supplementary devices for high-magnitude measurements such as in current or voltage transformers. Voltage is commonly obtained across the load while current measurement is in a series configuration.
Some digital panel meter requires you to have a fixed resistor called a shunt in order to display current or voltage. An external shunt allows the panel meter to display a higher DC than with just a self-contained internal shunt.
Since measuring different signals requires you to use or install other supplementary devices, listed below are some of the ways how other people use digital panel meters to measure different signals
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Some use shunt resistors to convert a DC to a DC voltage. This in turn would allow them to measure high DC voltages that exceeded the measurement range of the digital panel meter.
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When a DC exceeds the measurement range of the digital panel meter, some use an external voltage dividing circuit to divide the voltage. This way, they would be able to measure the DC.
The formula to use in dividing the voltage is
E2 = ( R2 / R1 + R2 ) x E1
E is Voltage and R is Resistance
You can also use the capacity (W) of R1 and R2
W = 3 (I2 × (R1 or R2))
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To measure high AC currents, some reduce the current flow by installing an external current transformer. Apart from that, some also convert a DC voltage to a DC signal for measurement by installing an additional current transformer transducer.
High AC Voltages
When an AC voltage exceeds the measurement range of the digital panel meter, some reduce the voltage by using an external power transformer. To convert a DC voltage to a DC signal for measurement, some install power transformers.
Non-linear signals, sensor signals, and other forms of signals
To measure anything related to electrical output like power, frequency, or any other forms of signal, some convert DC voltage to DC by using a power transducer or signal converter.
With that, you should try and make sure that the applied load does not exceed the rated power of your digital panel meter.
Apart from the measuring tips that we cited above, other people have also come up with different ways of using their digital panel meters. Having said that, you should explore your options and look for other ways so that you can effectively utilize your panel meter.
Recommended AC panel meter
This digital panel has a large LCD, allowing you to easily switch your view to voltage, current, and energy. Despite being an LCD panel meter, you can still use it in a dark place because of its backlight function.
It runs on active power, and has a reset function of energy and running time keys.
This product also has an added feature like the overload alarm function and data storage. You can set a limit in this panel meter, and when it reaches the limit, it would then trigger an alarm. It also stores data every time the power is off.
Working voltage: 80 ~ 270VAC
Test voltage: 80 ~ 270VAC
Rated power: 20A/4400W
Operating frequency: 45-65Hz
Measurement accuracy: 1.0 grade
Outside Dimensions: 96.4mm x 44mm x 24mm
Digital panel meters are used extensively in process control equipment to track humidity, pressure, and so on. Apart from that, it can also be used to monitor an electrical equipment performance by displaying its voltage or current information in the panel meter.
One example of a digital panel meter application is in large industrial motors. Since industrial motors are sometimes sensitive to fluctuations in voltage, you can easily monitor incoming voltage, detect if there is any problem, and immediately remedy the situation.
As we cited above, different digital panel meters display different input or readings. There are digital panel meters that are able to measure different scales at once, while there are others that can only display unit temperatures like Celsius or Fahrenheit.
Examples of which are digital temperature displays like Extended-Range Digital Temperature Display – Celsius. This type of digital panel meter has a simple function and it can only monitor the temperature.
Some of its features include:
Polarity: Automatic, (-) for Minus, no indication for positive polarity
Temperature range: -30°C to +100°C
Meter working temperature: 0°C to 50°C
Fixing method: plug-in
Cable length: approx. 50in (127cm)
Battery: 1 x 1.5V, AG13 (Battery Not Included)
So with that, you need to know which type of digital panel meter is best suited for you and your needs. Even though most digital panel meters can measure multiple variables in different units, it is still best to double-check its specifications and usability.
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