To clear up the working range of the RH sensor, I found the answer from page 110 of this extensive users manual: http://www.deltaohm.com/ver2008/uk/manuali/DO9847_M_17-06-2009_3.1_uk.pdf In looking into the working temperature range for the capacitive RH sensors, there are two different sets of specs. The 'working temperature of the probe' is -40C to +150C, but there was also a spec with a -20 to +80C working range. Whether the two sets of specs are determined by limits of the capacitive/polymer element, or a temperature limit which is determined by the max temp of the other materials that go into probe construction, is not stated... =============
Measuring relative humidity Sensor Capacitive Typical working temperature of the probe -40°C…+150°C Measuring range 0 … 100%R.H. Accuracy ±1%RH in the range 20…90%RH ±2%RH in the range 10…99%RH Resolution 0.1%RH Temperature drift @20°C 0.02%RH/°C Response time %RH at constant temperature 10sec (1080%RH; air velocity=2m/s) ============== I need to stop playing and get some work done! -Mark _____ From: Finlay MacNab [mailto:finlaymac...@hotmail.com] Sent: Thursday, June 23, 2011 9:47 AM To: vortex-l@eskimo.com Subject: RE: [Vo]:E-Cat vs. Water Heater for coffee/tea... I disagree with your assumption about he common characteristic table. The chart for the high temperature sensors lists a different accuracy for the %RH than is listed in the common characteristics table. There is another explanation for the stable output temperature besides wet steam that should be ruled out: If the reactor piping has a significant volume and the reactor is charged with water prior to being energized then the temperature of the output steam would be as observed even if the rate of steam production was not equal to the input flow rate. For the short demonstrations so far this explanation would be sufficient to explain the observed results if the assumptions are correct. The only way that you would see a significant change in the temperature of the output steam is if the heating took place after evaporation or under pressure. It seems logical to assume that most of the heat is transferred to the water at a liquid/reactor core interface. The 18 hour test did show fluctuations in output power however. _____ Date: Thu, 23 Jun 2011 11:14:17 -0500 Subject: Re: [Vo]:E-Cat vs. Water Heater for coffee/tea... From: joshua.c...@gmail.com To: vortex-l@eskimo.com On Thu, Jun 23, 2011 at 10:36 AM, Finlay MacNab <finlaymac...@hotmail.com> wrote: There are several different part numbers listed in the sensor chart in the pdf. A number of them are rated to 150C. Again, I think you're reading that wrong. There is a table that gives the "application range" for RH and temperature measurement in two columns. The application range for temperature measurement is -40 to 150C. I don't think that means the RH can be measured over that range. Below the table, there is a section called "common characteristics" (meaning it applies to all of the probes in the table) and for the RH sensors, it gives the "sensor operating temperature" as -20 to 80C. also. It would appear that the measurement would benefit from a measurement of pressure inside the reactor in order to confirm the steam is super heated. Assuming it could be measured accurately enough, and the water is pure enough. I think the flat temperature curve is better evidence that the steam is not superheated. Look at any of the temperature graphs. As the temperature increases, the curve is not perfectly smooth. There are small fluctuations. But when the bp is reached, it is completely flat, as if there is some fundamental physical reason for it. That reason is the presence of liquid water. It would be much easier and much more convincing if a small reduction in the flow rate caused the steam to go substantially above boiling by 10 or more degrees. But in all the experiments, the steam temperature is always flat, and within a degree or so of 100C.
