Sub-metering: benefits and applications

Published: 18 November 2011 Category: News

To measure is to manage – and there’s no better way of doing it than by using a sub-metering solution from Marshall-Tufflex.

Sub-metering: benefits and applications

Sub-metering does exactly what is says on the tin – it measures the amount of electricity used within premises in a precise and non-invasive manner. This information can be used in a variety of ways, from checking utility bills to carrying out an energy audit or implementing a cost centre charging programme.


Energy costs are, typically, one of the top three spends for most organisations but in many cases commercial and industrial operations are unable to determine exactly where this cost is incurred and how to reduce it. The first step has to be pinpointing where and when energy is consumed, not only to enable users to identify potential waste but also to help forecast anticipated cost/carbon savings. And that’s where Sinergy sub-metering comes in.


It offers a simple, non-invasive method of achieving this, quantifying energy usage across a whole site, floor-by-floor/zone-by-zone or even by individual machine. Not only does it reveal precise details of power usage, it can also identify inefficient areas of operation, perhaps highlighting machinery that requires maintenance or that is nearing the end of its life and therefore using more electricity. This approach allows for far more specific identification of energy use – and the more information you have, the more power you have to take action. Armed with this information organisations can make properly informed decisions on energy cost reduction strategies, enabling premises users, owner, energy/facilities managers etc to select the most appropriate and effective energy management/saving initiatives.


Sinergy systems are portable or fixed, depending upon the individual application, and use non-invasive clip-on transducers (CTs) or Flexeclamp CTs to gather data. Both approaches utilise a precision wound aircored inductor integrally coupled to a hybrid integrator module to provide an ac voltage signal directly proportional to the ac current being measured. Other measurement techniques are available but our research and development has shown this to be the most accurate method. We offer a wide range of sub-metering solutions suitable for most applications. In addition, being a UK manufacturer, we can also design bespoke solutions. All Sinergy systems are supported with software options. The range comprises a number of systems to suit specific customer applications:


* e-Tracker portable energy monitor


The e-Tracker portable kWh meter monitors incoming power supplies to show the pattern of demand over an hour, day, week or month. It can be used for recording energy use in power circuits and specific equipment without the need to have a fixed sub-metering solution. It also displays average demand to enable the calculation of load factor and can be used to determine causes of demand excursions/potential unauthorised consumption and for checking the electrical efficiency of individual pieces of equipment.


* k-Wattch hand-held energy monitor


k-Wattch is the little brother of e-Tracker and offers a robust and highly portable mains or battery-operated energy analyser that can measure both single and three phase devices, giving instant readings or recording and storing data for download to a USB memory stick. Data can be analysed using Sinergy's Deltrax software. Its non-invasive 32mm CTs simply clip round cables and monitor power factor, power, voltage or current, up to 1,000A. It is particularly relevant for users with no permanent solution for energy monitoring in place and who require a flexible, portable system that can go virtually anywhere and give instant readings.


For all Sinergy systems there are relevant supporting software options.