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Data Logger for Refrigeration
A much better idea would be to find a datalogger that can monitor 0 to 5VDC
and an amploc hall effect current sensor. http://www.ampsense.com/AMP25.html These things cost about $5 and need a stable 5V power source like an Artesyn AFC5-12S05F, 2 little resistors and a small capacitor. Loop one of the compressors power lines through the sensor and you can monitor not only when it turns on but how many amps it is drawing. With that information you can adjust the speed of the little Danfoss compressors to get the most cold for the least amps. If you can't find the Artesyn you can have one of my spares for $12. -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com "GBM" wrote in message ... Some of the dataloggers have the possibility of monitoring an event such as a switch on/off, but not all. I think I have finally come up with a simple method - I will just use two independent temperature loggers. One in the ice-box and one just above the condenser fan. The latter will get an upward spike in temperature when the compressor comes on. This way, I should be able to plot box temperature vs compressor on/off cycle. This should do it. Thanks for the input. GBM "nimbusgb" wrote in message oups.com... simpler is to take a couple of turns of the positive feed to the compressor round a reed switch. Pump on, reed closes, pump off reed opens. A lot simpler than having to read the current. Ian M |
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