I gather that the heater resistance should be around 33 ohms. Do resistance values of 37-48 ohms indicate a problem with the sensor, or is that within the normal range?
The heater wire itself should read around 33 ohms resistance, but the green and black wires connected to the heater wire will also add resistance to your reading. The longer the sensor cable, the greater your resistance reading will be, so readings of 37-48 ohms are within the normal range. A resistance reading of infinity or of less than 33 ohms would be caused by a break or short in the sensor cable and would be cause for concern. • I am considering using the 229-L matric potential sensor with a CR-1000 datalogger. Can I program the system to read equilibrium soil temperature prior to excitation for matric potential measurement? That way I measure soil temperature and matric potential with on sensor. Yes, we recommend that you measure and record the temperature of the sensor prior to turning on the heater and that reading can be used as a soil temperature reading. As long as matric potential measurements are not made more frequently than once every 15 minutes, there will be no signif
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