Quote:
Originally Posted by Freyguy
Yes, from the datasheet you can see the LEM Hass 300 up through 600 have a measurement range to 900A. Each model differs only in their sensitivity.
The 300= 2.08mV/A, 400=1.56mV/A, etc. The Tamura is 3.75mV/A which is why when you use the 300, you need to apply 1.8x gain in the code.
The LEM Hass 200-S is actually the closest fit to the Tamura. It's sensitivity is 3.125mV/A and would require a gain of 1.2 (multiplier value in code =19 vs 29 used for LEM 300). It's range is a bit smaller at 600A, but still higher than the 500A limit of the Tamura.
-Chris
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The Melexis sensor (or the CSA-1V) that Paul used in the 1000A controller could be pressed into service. Its much cheaper, but might need a bit of fiddling to get the current range right. Also, I am using a Tamura 500A one in mine, with a suitable multiplier as per Jackbauer's code snippet.