Energy Monitoring Unit (EMU) - OptoEMU Sensor
Opto 22
Commercially available (Product is available in market)
United States
Energy Monitoring Unit (EMU) - OptoEMU Sensor


The OptoEMU Sensor™ Energy Monitoring Unit monitors the electrical energy used in your facility and then delivers that data to online software applications—and optionally control and business systems—using your existing wired or wireless Ethernet network. The OptoEMU Sensor gives you the detailed, real-time data you need to analyze energy consumption and reduce energy costs.

You can view the real-time and historical energy data gathered by the OptoEMU Sensor online through a secure software service such as Pulse Energy or eSight Energy. The OptoEMU Sensor sends energy data directly to the service you choose, and you can view and analyze the data from any authorized computer or mobile device.

You can also incorporate data from the OptoEMU Sensor in control systems based on Opto 22’s PAC Project™ software or Modbus/TCP, or send data to OPC clients, SQL databases, or custom programs you develop using the Microsoft .NET Framework.

The OptoEMU Sensor monitors energy used by your whole building, by electrical subpanels, or by individual high-energy users like chillers and compressors. The Sensor can connect to a variety of metering devices that emit pulses and can also connect directly to electrical circuits using current transformers (CTs) with a .333VAC secondary.


The Sensor includes an easy-to-use utility program for setting up communication on your network, configuring the monitored devices, and entering the connection information needed to send data to the software service.

Energy management represents significant opportunities to improve the bottom line. The OptoEMU Sensor makes it easy to eliminate assumptions, identify trouble spots, and save energy costs.



The OPTOEMU-SNR-DR1 energy monitoring unit monitors the electrical energy used in your facility and then signals electrical equipment to turn on or off in response to a request from an electric utility, demand response aggregator, or curtailment service provider (CSP). To reduce peak energy use that triggers demand charges, electrical equipment loads can also be shed on predefined usage thresholds.

OPTOEMU-SNR-DR1 monitors up to two KY or KYZ pulsing devices, such as a pulsing meter or submeter, and up to 64 data inputs from Modbus devices over serial and Ethernet. The unit sends this data to an online service of your choosing, so you can see and analyze energy usage. The unit can also send energy data to control systems and company databases.

The unit's four signal relay outputs can be used to automatically respond to a DR event by signaling equipment such as HVAC fans and chillers to turn on or off, or signaling existing energy or building management systems to perform load shedding. Each Form C output can be wired for normally open or normally closed.

An easy-to-use utility program for configuring the unit is included.

The OPTOEMU-SNR-DR1 communicates with online services and computer networks over a standard 10/100 Mbps wired Ethernet network, over an 802.11a/b/g wireless LAN (local area network), or over both simultaneously.

Energy engineering and management combines engineering problem-solving and financial management techniques to reduce utility costs.


A competent manager would never approve a major expenditure without a detailed accounting of where the money is being spent.  So why isn’t energy accounted for in the same detailed manner?  Energy costs must be treated and managed the same as all other costs (like people, assets, and inventory) within a facility.  These detailed assessments represent opportunities - - significant and largely untapped – to improve the bottom line.


One objective:  To find a way to produce, document and maintain maximum cost effective energy savings in existing buildings.


Understand that reducing utility costs may offer one of the best opportunities a company has to improve the bottom line.


Building owners must realize that utility costs can be managed and controlled the same as all other costs within a facility.



Building owners need to recognize that utility costs can best be managed by the individual user by providing them with the proper information and incentive.


Accountability is what produces results; technology is only a tool to be employed after an opportunity has been identified that requires technical analysis and engineering involvement.


Saving energy is really about reducing costs.


The OptoEMU Sensor family is tool that can be used to meet these objectives.




A traditional approach might assume that monitoring has to occur by monitoring every piece of equipment up to the main utility meters (or the “Bottom to the Top” approach).  To get a plant total that matches the utility bills, very extensive and costly metering is required.




Another approach uses a “Top to Bottom” method that begins monitoring at the main utility meters and tracks the power usage outward thereby identifying the major energy consuming equipment immediately with the least but most efficient amount of metering.


The OptoEMU Sensor is an easy-to-use device that can easily connect to a load, log data, then serve that data into software applications.  It requires no programming, and can be configured with a simple free software tool.  The OptoEMU Sensor family is uniquie in two distinct ways: 1) It has built-in connectivity to cloud-based energy monitoring softwares, or can send data to almost any third party software or database via standard protocols and data format, and 2) it is fully compatible with Opto 22's SNAP PAC system for control applications.

Please see attached data sheets









$1295 (3V), $1095 (DR1), $895 (DR2)
United States

Energy Monitoring, Energy Efficiency, Energy Conservation, Demand Response


When compared to traditional control or BAS systems, the OptoEMU sensor is inexpensive, scalable, open, and requires no specific technical skillset to implement. Traditional control systems require programming expertise, and most BAS systems are closed and data is not easily accessible.


When compared to other energy monitoring applicances, the difference with OptoEMU Sensor is the ability to share data with control systems.



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