I've searched and searched, but could not come up with a zwave or zigbee temp sensor that measures higher than 250deg F.
I have a wood burning stove that I would like to monitor temperatures and automate the Stove fan and living room fans depending on flue temperature. Right now I have a thermocouple in the flue pipe connected to a basic pid/temp controller which reads out temperature on it's display. The alarm relay contact is connected to an ecolink door/window sensor which alerts me if temp gets over a certain temp.
I've seen people doing things with Arduino, Pi, etc, but I am not at that level yet.
There are also thermocouple pid controllers that have an analog 0-10VDC output, so I was thinking of getting one and connecting it to a Fibaro Smart Implant, but I don't know how I would do the temperature correction.
Anyone come across any way to measure high temps, in the 500 degree range?
I see what your are up against. I think a Thermocouple is the only reliable way to measure such temperatures. Even BBQ (if it could be interfaced) are usually limited to <500 °F as the wire is teflon insulated. I've lost many to Grill "flare ups".
To use the 0 to 10V amplifier you would have to write or modify a Hubitat Driver. The conversion from volts to °F would not be too bad because in the 500 ° Range the response is relatively linear so a straight line conversion could be used.
I've got the exact same setup, but...
I have the thermocouple on the top shelf of the insert.
The insert's fan has two speeds, low and high.
The temp controller now starts up the fan on low when temp hits 200F, switches to high at 700F, and the reverse.
I used to have it send a notification via an ecolink contact sensor, but got tired of the stove's inaccurate ways with its native thermo switch, that I replaced its action with the pid/thermo switch. I had to give up the warning, but realistically, I should be able to hear the high speed of the fan in the house, and I shouldn't be leaving the house until the burn is stabilized to my arbitrarily selected temp of below 700F.
I too would be very interested in a simple instrumentation deal. Something like, gee, I wonder what the stove temp is now? Or, what was the temp profile of my last burn using x wood?
I was researching yesterday and found out what I need is a thermocouple transmitter. It's basically an amplifier circuit that takes the DC microvolt output of the thermocouple and brings it up to a linear 0-10vdc signal. It looks like what that guy is using in the video. I also ordered a Fibaro Smart Implant to connect it to. I'm not sure how accurate it will be or how I will handle the data translation to degrees, but it will give me something to start out and play with.
I will probably just add an additional thermocouple into my flue pipe for this new setup so that I can continue to use the display/sensor that I already have.
Typically thermocouple inputs are high impedance. If you use the "Isolated Thermocouple to Analog Converter" you should be able to share. Mostly because of the isolation in the amplifier will not result in grounding (common) issues between the amplifier and PID controller.
From what I have seen in researching this the past few days, it won't work. I ended up buying a new pid controller with analog 0-10vdc output this morning. Now I can use my existing thermocouple, get a nicer looking controller, and an output to Hubitat. Should be here Monday. The thermocouple transmitter I already ordered was coming from China, so who knows when I would have seen it.
Dwyer had 32 in stock this morning of the 32B-63-LV. The LV stands for low voltage. The non LV runs off 110V
Thanks very much. How the heck did you find that? Awesome.
It's too bad there doesn't seem to be one with linear voltage output as well as two relays, vs one. I've been using both relays on my existing Auber.
edit: You know, I'm thinking the output of the controller, 0-10v, is going to want to control a device to a setpoint, so it wouldn't be related to the actual temperature, just the difference from the setpoint. I'm so confused.
No doubt there will be some tinkering required. I am thinking the set point will likely be set to the highest anticipated stove temp. As the process (actual) temp approaches the set temp, the voltage output will change in a linear way.
But don't take my word for it. I'm guessing at this point, but optimistic in making it work.
I also saw some controllers that had temperature retransmission, but could not find documentation on how this works. It does not show the values that it would retransmit at. Since it's just retransmitting, I would assume it is at thermocouple/microvolt levels, not 0-10 volt levels.
The G series have retransmission, but don't seem to be in stock and the smallest size is 1/16 din (way too big for the wife approval factor since it mounts to the bottom of our mantle).
Seems like a good brand though. Stumbled on them from a beer brewing site that it was mentioned on.
I would use something like the unit below to convert the thermocouple to 4-20 mA signal. Very easy to loop this signal output through multiple device inputs and to convert to 1-10 V (for the Fibaro) by using a 500 ohm resistor as a "jumper." Better double check the math on the resistor value before taking my word for it.
