Re: Re: Accurate Power (Electricity and Gas) Monitoring

[Ben McCormack <yahoogroup@xxxxxxxxxxxxxxxxxxx>]

I thought the issue was using the clamp meters that only measure=20=20
current. That is fine but the voltage can vary and therefore give=20=20
inaccurate results.

do the RFX stuff get over this?

Ben

On 23 Feb 2009, at  09:54, b_weijenberg wrote:

> Ben,
>
> The RFXMeter is a device that can have 3 modules installed for real
> power metering (P=3DU*I) and/or pulse metering and transmits RF data
> packets. http://www.rfxcom.com/sensors.htm
>
> You would need an RFXPwr module for each power phase. These modules
> measure the line voltage and the current and calculate the real power
> usage with an accuracy within 3%.
> Or if the utility meter has a blinking LED that indicates the power
> usage you can use an RFXPulse with photo-sensor.
>
> Some gas meters in the UK have a small mirror on the least
> significant digit. With an RFXPulse and reflective-optical sensor it
> is then possible to measure the gas usage too.
> There are also water meters that have a turning wheel that has a half
> reflecting metal surface on it. These meters can also be read using
> the RFXPulse with reflective-optical sensor.
>
> The 433.92MHz RFXCOM receiver is used to receive the RFXMeter.
> Besides the RFXMeter this receiver can also receive Oregon Scientific
> temperature, humidity, wind speed, barometer, body weight scales. And
> HomeEasy remotes, BBSB, DomiaLite and X10 RF.
> As software you can use for example xPL, Heyu, Domotiga,
> Homeseer+RFXCOM plug-in, HouseBot.
>
> Bert
> --- In ukha_d@xxxxxxx, Ben McCormack <yahoogroup@...> wrote:
>>
>> All
>>
>> I have been thinking of buying a CurrentCost unit but with the
> recent
>> reports that the accuracy is not great I have starting looking for
>> other options.
>>
>> To be more accurate it seems like you need to replace or add a
> meter
>> with a pulsed output. Once you have this pulse you can capture and
> do
>> things with the data.
>>
>> I have found a supplier of the pulsed output meters -
> http://www.meters.co.uk/
>>  They sell both Gas and Electric meters. Gas are about =A3200 each
> and
>> a I can't find a price for Electric.
>>
>> I have not seen or purchased one of these yet but I am sure this
> is
>> interesting for some people on the list.
>>
>> Ben
>>
>
>
>
>
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