3 Things You Should Consider When Choosing a Power Meter

LOS ANGELES - April 27, 2015 - PRLog -- Smart power meters can be used to show your real time electricity consumption, help with load management and transformer monitoring, and power monitoring.  Smart power meters can save you time and money since changes can be made to reduce energy usage automatically when it is not needed. Touch Screen PLC's, data loggers, Programmable Automation Controllers, and PC's running SCADA software can be used forcontrol, monitoring and displaying the data in a way that is easy to understand and analyze.

So what are the most important things to consider when selecting an energy meter?

Single-phase or Three-phase

When choosing an energy meter, the first thing you need to consider is how many phases are needed for the system. Most suppliers nowadays provide single-phase power meters and three-phase power meters. If the current system you are logging data from is single-phase, then you need a single-phase power meter. If it is a three-phase electric system, then you can only use a three-phase power meter to work with it. Single-phase power meters like PM-3112 (http://www.icpdas-usa.com/pm_3112.html?r=press) and PM-3114 (http://www.icpdas-usa.com/pm_3114_100.html?r=press) are compact, din-rail mountable, and flexible for various energy monitoring applications. They come in 2 loops and 4 loops accordingly, and support a wide range of input types such as Vrms, Irms, kW, kWh, kVA, kVAh, kVAR, kVARh, and PF. They can be used in both low voltage primary side and medium/high voltage secondary side, enabling users to obtain reliable and accurate real time energy consumption readings from the equipment.

Number of Amps

After determining the phase of the power meter, another thing you need to consider is how many amps you need for the system. Usually, the most common options that intelligent power meters have for amps are 60 amps, 100 amps, and 200 amps. The number of amps supported can vary as the power systems vary. It is not workable if you choose a 60A power meter for a power measuring system that actually needs 100A. For example, the PM-3133 (http://www.icpdas-usa.com/search-result.php?searchproduct=pm-3133?r=press) series three-phase smart power meter comes in three different types of amps: the PM-3133-100 (http://www.icpdas-usa.com/pm_3133_100.html?r=press) supports 60A; the PM-3133-160 (http://www.icpdas-usa.com/pm_3133_160.html?r=press) supports 100A, while the PM-3133-240 (http://www.icpdas-usa.com/pm_3133_240_mtcp.html?r=press) works for 200A. With their high accuracy (1%, PF=1), they can generate very reliable data on the actual power you consume. These compact size and cost-effective power meters are equipped with revolutionary wired clip-on CTs for easy installation. It operates over a wide input voltage range of 10 ~ 300 VAC which is compatible worldwide.

Communication Protocols

Smart Power Meters communicate over different mediums and protocols, so it is also very important to determine which communication protocol your power meter needs to work with. Modbus is one of the most common protocols in industrial applications. Developed by MODICON in 1979, Modbus has become a standardized, openly published and easy-to-use protocolto connect industrial devices. Smart power meters that support Modbus protocols are easier to integrate with your current Modbus systems. For example, PM-3112 (http://www.icpdas-usa.com/pm_3112.html?r=press) supports Modbus RTU while PM-3112-MTCP (http://www.icpdas-usa.com/pm_3112_mtcp.html?r=press) communicates over Modbus TCP. Besides Modbus, other communication protocols are also available for power monitoring applications. CAN bus, or a Controller Area Network is a protocol that allows devices to be connected in applications without a hosting PC. Today CAN bus is used in automotive, cycling, industrial and entertainment industries for data communication. Smart power meters like PM-3133-240-CAN (http://www.icpdas-usa.com/pm_3133_240_can.html?r=press) is designed to support CAN bus and can seamlessly integrate with existing CAN bus systems. Another protocol is CANopen, which is a communication protocol used in embedded systems in automation. Power meters that support CANopen include single-phase smart power meters like PM-3114-160-CPS (http://www.icpdas-usa.com/pm_3114_160_cps.html?r=press) and three-phase power meters like PM-3133-100-CPS (http://www.icpdas-usa.com/pm_3133_100_cps.html?r=press). In conclusion, choosing a smart power meter with the right communication protocol is very important in getting the system up and running.

What Else?

Now that we have considered phases, amps, and communication protocols, what else do we need for a successful energy monitoring system? One biggest advantage of smart power meters is that it can be connected with SCADA and HMI software and automate the whole system. With the SCADA software (http://www.icpdas-usa.com/hmiandscada.html?r=press), it can show the status of your equipment, send email or text message alarms, log data, implement control and generate reports. Touch Screen Controllers like TPD-433 (http://www.icpdas-usa.com/tpd_433.html?r=press) can also be used for home automation projects where you can view your real time power consumption data and control your electronic devices on a touchpad.

ICP DAS USA is a manufacturer of Industrial Data Acquisition, Automation and Control products; specializing in: PLC Hardware, Embedded controllers, Remote I/O modules, Industrial Ethernet Switches, PCI and ISA boards, and much more! ICP DAS USA provides free technical support and free technical trainings. We also provide system integration services at your needs.

For more information, please visit http://www.icpdas-usa.com (http://www.icpdas-usa.com?r=press)
Maria Lemone
Sales Manager, ICP DAS USA, Inc.
Phone.   (310) 517-9888  x105   |  Fax. (310) 517-0998
Email:  mariaL@icpdas-usa.com