ac voltage and current meter with lcd display manufacturer

Red Lion has been delivering innovative solutions to global markets since 1972 through communication, monitoring and control for industrial automation and networking - enabling companies worldwide to gain real-time data visibility that drives productivity. Red Lion is part of Spectris plc, the productivity enhancing instrumentation and controls company.

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Just read Dale Klines review. DANGER!!! If youre going to run 18# wire, you need to fuse the hot, at the source, with a 250VAC or better fuse rated no higher than a couple Amps. The green wire should be used only as an Equipment Ground! You should use a twisted pair cable with at least 300 volt insulation to connect to the CT. current Transformer DO NOT ASSUME that you can connect a CT input in common with a power connection!

To answer the question regarding length of cable from the current transformer to the meter module: There is no hard limit. The main consideration is the resistance of the connecting cable. Since the resistance of the transformer itself is about 55 ohms, up to 20% of that, 10 ohms, should have no observable effect on current measurement accuracy. Voltage rating is not an issue because the transformer output is in the millivolt range. However the connecting cable WILL be sensitive to AC magnetic fields such as from a nearby current-carrying wire or cable. For this reason, the current transformer connecting cable should be kept away, an inch is plenty, from other current-carrying wiring. In particular the current transformer wires should not be in the same cable as the load current-carrying wires. Using a twisted pair cable is ideal. Ordinary doorbell wire, #22 or #24 conductor, should be good for up to 100 feet. This applies to all MPJA AC meters that use current transformers.

I have used several other of MPJA DC meters with great success. But I have a question on this AC V/A meter... How far away can the meter readout be from the LOAD under test? I have two electric heaters in the basement that I would like to monitor from the kitchen about 35 feet away. SInce there is very little power pulled by the meter itself, a simple 18GA extension will bring the 220VAC to the meter in the kitchen, and the third wire for the toroid. ---White & Black across the 220VAC, and the Green for the toroid--- Will that long wire for the toroid affect the accuracy of the current measurement?

In regards to Mr. Lopez comment; I have used 6 of these meters with no problem. PDF data clearly shows 1 of the load power leads going through the current ttransformer with the CT leads connected to Meter. My 33yr. Granddaughter a nurse connected 2 up at her house. you must be doing something wrong. I plan on us8ing 2 more in a solar demo. class

I mounted two of these in a pair of 4x4x2 metal Handy Boxes to monitor my 20KW backup diesel genny. I also did the same on a break out panel for 15KW diesel genny mounted on a trailer to assist with balancing loads on a temporary electrical service.

I have bought more than 10 of these meters and they work great. They are cheap and do a great and accurate job of telling me when my motors are in trouble. I will keep buying these and I recommend them as well.

I bought two of these meters and have not worked for me. The voltage measurement is correct, but the current is always maintained 26-29Amp. The diagram is in the data sheet does not say how and where to use the current transformer, only said that the load must be connected to the connector, but no output voltage. I bought other meters ME 31496 and work perfectly.

I chose to use mine as a portable AC voltage and current monitor. It mounts easily in a deep 1900 box with a duplex/GFCI cover.Almost! Its about 5mm too wide to fit in the GFCI opening without a little grinding. I havent had a chance to check it for accuracy yet but it sure looks good!

A method of measurement ac signals using a rectifier circuit. Average responding meters are suitable for measuring only sinusoidal waveforms. Significant errors can result when they are used to measure irregular waveforms.

An instrument used for measuring a wide variety of voltage or current waveforms and converting the measured value to a numeric or alphanumeric display. Most digital panel meters employ either LCD (liquid crystal) or LED (light emitting diodes) as the display element.

For LED and LCD based panel meters, the number of numeric characters that can be displayed. For example, a four-digit panel meter can display inputs with a maximum resolution of 9999.

A term commonly used to describe a type of instrument transformer used to step-down very large ac currents to a lower value (5A is the most common rating). Their shape resembles a donut.

Internationally recognized unit of measure for frequency. A one Hertz waveform repeats itself every second. AC line frequency meters usually display Hertz in 0.1 or 0.01Hz resolutions.

An alphanumeric digital display employing a ‘liquid crystal’ material, sandwiched between two layers of glass. LCD displays typically require a minimum level of ambient light in order to be visible. However, backlit LCD displays can be viewed in total darkness.

An alphanumeric digital display employing semiconductor-based, ‘light emitting diodes’ as the active element. LED displays are visible in most ambient lighting conditions. New to the market are super-bright LEDs that are readable in outdoor applications.

A ‘National Electrical Manufacturers Association’ standard that defines the requirements for instrument enclosures designed for use in harsh environments.

An electrical measuring instrument designed to measure and display applied dc or ac voltages. Its physical design allows it to be easily mounted in instrumentation panels. Panel meters can be digital (with alphanumeric displays) or analog (with moving pointers).

The ratio of the real power (in Watts) flowing to an AC load to the apparent power (in volt amps). Power Factor is usually expressed as a number between 0 and 1.

A panel meter specifically designed to convert industrial signals such as 4-20mA current loops or 0-5Vdc into physical parameters (weight, pressure, temperature, etc.). Process monitors typically include potentiometers for adjusting input signal offsets and span.

Programmable Logic Controllers, or PLCs, find widespread uses in industrial control applications. Digital panel meters can be used to visually display a PLC’s analog outputs (4-20mA, 0-5V, etc.).

‘rms’ stands for “root-mean-square”. The true rms value of a voltage or current waveform is a measure of its potential power or heating effect. Unlike their average responding counterparts, true rms reading panel meters can accurately measure the value of non-sinusoidal waveforms (step, triangle, square, etc.).

Well known abbreviation for ‘Underwriters Laboratories’. Underwriters Laboratories is an internationally recognized safety testing organization. AC-powered panel meters are typically required to pass stringent UL testing before they are allowed to carry the UL mark.

An AC unit of measure. Volt amperes (abbreviated as ‘VA’) are the product a circuit’s rms voltage and its rms current. The volt-ampere is also referred to as ‘apparent power’.

A method of transmitting signals to a remote location by way of a varying dc current. For example, a 4mA level typically denotes a signal’s zero value, while a 20mA level denotes a maximum reading for the signal of interest. 4-20mA current loops are widely used in industrial applications.

A category of digital panel meters designed to be powered directly from the signal they are measuring and, as their name implies, only require two wires.

A digital meter designed to measure varying analog voltages within the fixed ranges of either 0 to 5Vdc, or 0 to 10Vdc. These types of process meters (or monitors) are used in industrial applications.

Just read Dale Klines review. DANGER!!! If youre going to run 18# wire, you need to fuse the hot, at the source, with a 250VAC or better fuse rated no higher than a couple Amps. The green wire should be used only as an Equipment Ground! You should use a twisted pair cable with at least 300 volt insulation to connect to the CT. current Transformer DO NOT ASSUME that you can connect a CT input in common with a power connection!

To answer the question regarding length of cable from the current transformer to the meter module: There is no hard limit. The main consideration is the resistance of the connecting cable. Since the resistance of the transformer itself is about 55 ohms, up to 20% of that, 10 ohms, should have no observable effect on current measurement accuracy. Voltage rating is not an issue because the transformer output is in the millivolt range. However the connecting cable WILL be sensitive to AC magnetic fields such as from a nearby current-carrying wire or cable. For this reason, the current transformer connecting cable should be kept away, an inch is plenty, from other current-carrying wiring. In particular the current transformer wires should not be in the same cable as the load current-carrying wires. Using a twisted pair cable is ideal. Ordinary doorbell wire, #22 or #24 conductor, should be good for up to 100 feet. This applies to all MPJA AC meters that use current transformers.

I have used several other of MPJA DC meters with great success. But I have a question on this AC V/A meter... How far away can the meter readout be from the LOAD under test? I have two electric heaters in the basement that I would like to monitor from the kitchen about 35 feet away. SInce there is very little power pulled by the meter itself, a simple 18GA extension will bring the 220VAC to the meter in the kitchen, and the third wire for the toroid. ---White & Black across the 220VAC, and the Green for the toroid--- Will that long wire for the toroid affect the accuracy of the current measurement?

In regards to Mr. Lopez comment; I have used 6 of these meters with no problem. PDF data clearly shows 1 of the load power leads going through the current ttransformer with the CT leads connected to Meter. My 33yr. Granddaughter a nurse connected 2 up at her house. you must be doing something wrong. I plan on us8ing 2 more in a solar demo. class

I mounted two of these in a pair of 4x4x2 metal Handy Boxes to monitor my 20KW backup diesel genny. I also did the same on a break out panel for 15KW diesel genny mounted on a trailer to assist with balancing loads on a temporary electrical service.

I have bought more than 10 of these meters and they work great. They are cheap and do a great and accurate job of telling me when my motors are in trouble. I will keep buying these and I recommend them as well.

I bought two of these meters and have not worked for me. The voltage measurement is correct, but the current is always maintained 26-29Amp. The diagram is in the data sheet does not say how and where to use the current transformer, only said that the load must be connected to the connector, but no output voltage. I bought other meters ME 31496 and work perfectly.

I chose to use mine as a portable AC voltage and current monitor. It mounts easily in a deep 1900 box with a duplex/GFCI cover.Almost! Its about 5mm too wide to fit in the GFCI opening without a little grinding. I havent had a chance to check it for accuracy yet but it sure looks good!

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