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barryforever
Joined: 15 Aug 2007
Posts: 43
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 29 Apr 2008 17:01 Suggestion of any Power Sensor |
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Hello...
Im working on Fuel stack Hydrogen technology.I have designed a automated test
system in Labview. I m going to test Power Generation maximum output power for a particular pressure of hydrogen inflow..
I want to measure power directly a digital format like 4-20ma or 4-10Vdc ... so that i can feed it to the system directly so that the automatic system continues ...
So any suggestion of Power measurement Sensors
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sunderwood
Joined: 08 Jan 2008
Posts: 63
Helped: 10
Location: US, CA
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| 29 Apr 2008 21:35 Re: Suggestion of any Power Sensor |
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| Voltage sensing can be done with a simple opamp circuit, either a voltage divider or a differential amplifier. For the current, you can either use a series resistor with a diff amplifier, or a hall sensor with proper scaling (opamps again)... It should be straightforward.
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kender
Joined: 19 Jun 2005
Posts: 936
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Location: Stanford, SF Bay Peninsula, California, Earth, Solar System, Milky Way
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| 30 Apr 2008 7:51 Re: Suggestion of any Power Sensor |
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The true power measurement sensor is a calorimeter. Run the output of your fuel cell into a resistor. Put resistor into a vessel with water, which is thermall insulated. Stir the water. Measure it's temperature.
Too awkward? Then do P=VI. Measure voltage and current into the load that the fuel cell is outputing to. Multiply in LabView.
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barryforever
Joined: 15 Aug 2007
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FvM
Joined: 22 Jan 2008
Posts: 2488
Helped: 409
Location: Bochum, Germany
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| 30 Apr 2008 14:05 Re: Suggestion of any Power Sensor |
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| The said power sensor is very different from what you need in your fuel cell application. I think the only suitable method is by mesauring current and voltage (as suggested) and calculating the power in digital processing. For AC (mains voltage) applications, digital instruments, also with a 4-20 mA output are available from electrical instrumentation manufacturers. May be you can get some for DC power also. You didn't mention the voltage and current range, that may be important to indentify a suitable instrument.
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kender
Joined: 19 Jun 2005
Posts: 936
Helped: 68
Location: Stanford, SF Bay Peninsula, California, Earth, Solar System, Milky Way
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| 01 May 2008 1:48 Re: Suggestion of any Power Sensor |
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| barryforever wrote: |
| i need a more accurate method of measurement |
How accurate do you want your power measurement to be?
What are the ranges of voltage and current that you expect from your fuel cell?
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barryforever
Joined: 15 Aug 2007
Posts: 43
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| 07 May 2008 13:57 Re: Suggestion of any Power Sensor |
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| 230 v and 10 amps
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kender
Joined: 19 Jun 2005
Posts: 936
Helped: 68
Location: Stanford, SF Bay Peninsula, California, Earth, Solar System, Milky Way
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| 09 May 2008 5:37 Re: Suggestion of any Power Sensor |
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| barryforever wrote: |
| 230 v and 10 amps |
Are you lookig for something similar to a power meter used by the utility companies?
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FvM
Joined: 22 Jan 2008
Posts: 2488
Helped: 409
Location: Bochum, Germany
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| 09 May 2008 8:01 Re: Suggestion of any Power Sensor |
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| I had understood, that a DC power meter is requested. If it's actually AC, you have a rich choice of ready to use components, from general electrical instrumentation and automation equipment as well. Some of these parts may be able to measure also DC power.
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kender
Joined: 19 Jun 2005
Posts: 936
Helped: 68
Location: Stanford, SF Bay Peninsula, California, Earth, Solar System, Milky Way
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| 09 May 2008 8:05 Re: Suggestion of any Power Sensor |
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| FvM wrote: |
| I had understood, that a DC power meter is requested. ... |
One thing in this thread that so far defies understanding is the fact that P=VI measurement was dismissed as insufficiently accurate.
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barryforever
Joined: 15 Aug 2007
Posts: 43
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| 16 Jun 2008 9:24 Suggestion of any Power Sensor |
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| where can i get these things
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