EKM-Omnimeter II UL v.3 – Universal Smart Meter, Single Phase or 3-Phase, 120 to 240V, 50/60Hz, up to 5000 Amps

EKM Omnimeter II UL v.3

EKM-Omnimeter II UL v.3 – Universal Smart Meter, Single Phase or 3-Phase, 120 to 240V, 50/60Hz, up to 5000 Amps

EKM Omnimeter II UL v.3, 3-phase 3-wire or 4-wire, 120 to 240V, 50/60Hz, Single-phase 2 or 3-wire. Free cloud data service when paired with an EKM Push gateway!

Description: UL Listed Universal Smart Meter

Voltage: 120 volts, 120/240 volts, 120/208 volts, 230 volts

Amperage: Up to 5000 amps

Type: External CT, 50 or 60 Hz

System: Single-Phase 2-wire or 3-wire, 3-Ph. 3-Wire, zor 3-Ph. 4-wire

Data: Smart Meter v.3 RS-485 Communications

Model: EKM-Omnimeter II UL v.3

Warranty: 10 Year Warranty

EKM-Omnimeter II UL v.3 – The Underwriters Laboratories (UL) approved version of our v.3 Omnimeter. This meter is both UL and cUL (Canada UL) Listed, and has been tested to CSA standards.

This meter is truly a worldwide universal meter and can be used to meter a wide variety of electrical systems. It meters systems from 120V single-phase 2-wire, to 240V 3-phase 4-wire, both 60Hz and 50Hz. There is not an electrical system, up to 240 volts, in common use that this meter will not support. Accurate to 0.5% (Class 0.5). We now stock CTs for up to 5000A, and much larger CTs are available on special order.

This meter has been accuracy tested and certified for by the State of California Department of Weights and Measures. It is California Type Approved and meets California standards for revenue grade metering. Many other states accept California Type Approval for their metering requirements.

Note: this meter must be paired with one or more Current Transformers in order to operate. The CT ratio can be set internally in the meter to work with up to 5000 amp CTs (no multiplier needed).

  • Use 1 CT for 120 volt single phase North American, or 230 volt 2-wire foreign systems
  • Use 2 CTs for 120/240 volt single phase systems
  • Use 2 CTs for 3-phase 3-wire systems (no neutral)
  • Use 3 CTS for 3-phase 4-wire systems

Easy clip-on DIN rail mounting.

How to install an Omnimeter (it is a v.4 Omnimeter in this case but v.3 Omnimeters are installed in a similar way):

These meters are also supported by our revolutionary EKM Push system. This is our cloud-based, plug-and-play, meter data solution. We are really excited about this new system, and recommend it for most remote reading applications that use our Omnimeter models. EKM Push users can also take advantage of Encompass.io, which is our free online dashboard and meter management suite.


Encompass.io is our free online meter management platform for monitoring and managing meters. It is designed specifically for people who are remotely reading their meters via the EKM Push system. This platform can be used to visualize usage on dashboards, visualize cost, monitor trends, group meters, and a lot more. Each meter in Encompass can also be set up to email you PDF and CSV reports that you can use to monitor you meters and/or use for billing. Here is a sample PDF report:

EKM Widget

The EKM Widget offers another option for quickly seeing your meter data online for EKM Push users. It is also easy to save and share your Widget setting once you have it setup how you want. Here are a couple examples:

EKM Dash

Our Omnimeters are also fully supported by our free, remote reading, EKM Dash software. If you want to read your Omnimeter on a computer locally, without the EKM Push system, then this software is what you would use. You will also need an EKM Blink USB Converter in order to do so.

For more information about our products and services, we encourage you to visit our online Knowledge Base, which provides spec sheets, videos, tutorials, FAQs, diagrams, and more.

For a proper UL install, please follow the installation instructions here: EKM-Omnimeter II UL v.3 Spec Sheet

To better understand the differences between Omnimeter models you can download our Omnimeter and Communication Device Comparison Chart.


Ask a Question
  • I want to use this to monitor a single phase 240v NEMA L6-30R outlet (hot, hot, ground). Do I need to connect a neutral wire to the meter or can I connect just the two 120v hots to this meter?

    If you only have 2 hot wires and no neutral wire, you can still use this meter.  This is similar to how electrical systems are in Europe and other parts of the world.  For this system you will need a meter and only one Current Transformer.  Your system is a 2-wre system, you will connect your like this:  https://help.ekmmetering.com/support/solutions/articles/6000081675-single-phase-2-wire-120-volt-240-volt-230-volt-non-u-s-metering

  • Is this meter ANSI certified?

    The Omnimeter II v.3 UL is not ANSI C12.1 or ANSI C12.20 tested and certified.  Only our Omnimeter Pulse v.4 UL is ANSI C12.1 or ANSI C12.20 tested and certified.

  • Can you read the meter without a computer?

    Yes. These meters can alway be read on their LCD screen. The last page of the meter's spec sheet shows the 15 data points that the screen cycles through.

  • I want to monitor 1 - 240 Volt Appliance so 1 CT on each Hot Wire (Phase) In addition i want to monitor another - 120 Circuit( On one of phase already used above. So can i use 3 CTs or should only use 2 and combine load of 2 wires on same Phase.

    If you want to aggregate the Total kWh from both loads then you can use one meter for this. You can either pass multiple wires through a CT (provided that they are on the same phase), or you can use two CTs for the same phase, that both run their leads to the same ports on the meter. So you can either aggregate the current from multiple wires in one CT, or you can aggregate the current from two CTs for the same phase.

    If you want the kWh values of both loads to be separate then you will need to use two meters.

  • A follow up to the question about multiple circuits on one meter. This is a 3 phase panel, 120/208. I will only meter 120v circuits, no 208. I have not seen how the bars run behind the 120v breakers. I imagine they are divided between all 3 legs. I could easily make it so each apartment (and meter) are on only 2 of 3 legs. But it looks like the pulse v.4 would be able to meter a unit with circuits on all 3 phases as described in last question. Correct?

    Yes, the Omnimeter will also meter 3 phase systems. And similar to the example in the previous question, you can pass multiple wires through the CTs for each phase. It is important that the wires are indeed on the same and correct phase or the Omnimeter won't be accurate.

  • I want to meter after a panel with single 120v 20 amp breakers. Each unit will have 5 breakers. Can I run all 5 circuits with one meter?

    If you want to aggregate the kWh usage for each unit into a single value then this should be no problem with one meter. You can pass multiple wires through a current transformer, provided that each wire is on the same phase. So for example, if the system is 120/240v single phase (2 hot, 1 neutral), and you have 2 circuits on one phase and 3 circuits on the other phase, you would pass the first 2 wires through one CT and the other 3 wires through the second CT. Both CTs would then be connected to the same meter.

    If, however, you want to keep the circuits separated and have a kWh for each, then you would need to use 2 of our v.4 Omnimeters, as these meters provide kWh on each line as well as an aggregated total. So you would be able to connect up to three 120v lines to each of these meters, each line with their own CT.

  • Can we connect only two phase with this meter and then calculate KWh?

    Yes, this meter will work on systems from single phase to three phase. For the system that you've described it sounds like you would have two current transformers, two voltage references (for each phase), and a neutral reference. The meter will provide a Total kWh value with no calculation or multiplier needed.

    * Use 1 CT for single phase 2-wire systems (one hot and one neutral, with or without ground).  
    * Use 2 CTs for a 120/240V three-wire system (two hots and a neutral, with or without ground).
    * Use 2 CTs for 3-phase 3-wire systems.  (without neutral, up to 415V)
    * Use 3 CTs for 3-phase 4-wire systems. (with neutral, up to 480V)

  • Do you offer a model that works on 277/480 3 phase 4 wire system?

    Yes. The Omnimeter I v.3 and Omnimeter Pulse v.4 can both be used on 277/480v 3-phase 4-wire electrical systems. Technically any of the Omnimeters would work, however, the Omnimeter II UL v.3 and the Omnimeter Pulse UL v.4 would not retain their UL Listed certification as this only applies up to 240v.

  • What exactly comes with the unit?

    Only the meter itself is part of this product listing. This meter does need to be paired with one or more Current Transformers (CTs) in order to operate. The CTs are sold separately so that you can select the correct quantity, amperage rating, diameter, and solid core or split core, for you particular application. All other Accessories, Enclosures, and Meter Reading Solutions are sold separately.

  • From the picture the wiring looks pretty small. Will the amp probes go around #3 copper? Also, it shows the lines spliced to feed the meter. Would a separate circuit breaker work instead, as the wiring cannot be spliced?

    We carry a wide range of Current Transformers (CTs, or amp probes as you call them) for diameters and amperages up to 180mm and 5000 amps. So we can definitely help you find CTs for #3 wires. The image that you’re referring to is somewhat diagrammatic and shows one way to connect the essential elements of the metering system. In reality there are many ways that it could be set up. For example, the voltage reference wires that are spliced in the image could instead be connected at the breaker or main lug, instead of spliced in the middle of a wire. The meter simply needs to be able to sample the voltage from the correct phase.