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Temp controller for use with 3 wire thermocouple connector
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There are many options here that can be used with an rtd... ranging from hundreds of dollars to some of the the cheap inkbird type hysteresis controllers (the $99 prewired inkbird pid box uses a 3 wire rtd setup). It really depends on what you want. (pid control is NOT important for this type of duty vs hysteresis)
I use an arduino based brucontrol setup which allows me to write temp control fermentation schedules if I want (for example it will hold the temp at 66 degrees for x amount of days then let it ramp up and cold crash Y amount of hours or days later.. it all runs on 12 and 24v dc including the solenoid valves. (heat is 120v). plus its all available from any pc on my network of via the net through teamviewer.
Some of the other plc type solutions Ive seen with this capability tent to cost thousands of dollars..
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Give automation direct a look.
They have a basic and advice models both have a simple on/ off control option like a rancho controller.
the advance model has RS-485 communications that you could use in the future for remote monitoring with a plc.
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You will need a PID controller--we use Fujis--and some RTD cable to hook them up. The special RTD cable probably isn't essential, but it's made for use with them and is very high quality wire. Besdes, it has the proper color-coding.
There are two red and one white wire. The tow reds are interchangeable, but the white and reds must go to the right terminals on the PID controller.
The controllers come in different line voltages--220, 110 VAC and 24 VAC are common. It isn't essential that this match the control voltage--the voltage of your solenoids--but it is convenient. For safety's sake, 24VAC is preferable for line and control.
A central control panel makes life much easier. Some of the new PID controllers can communicate via wifi, which is handy when you want to check temps from home, but then they are also vulnerable to tampering by third parties.
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Originally posted by Starcat View PostFist thing your 3 wire not considered as a " Thermocouple. " Your term RTD is correct and they will not necessarily work on the same controllers....... They have to be housed and configured into a dedicated control panel, with proper overload protection, filtering, disconnect, and so forth.
the issue is that there isn't a nice plug or outlet to plug into on the plastic head, when you open it up there's just the three wires on little bus bars that come up from the probe tip. so that's why Im assuming its three wire RTD.
I found lots of references to the fuji series, am familiar with those PID type controllers, day to day programming isn't too bad. we basically just put them in litlle plastic boxes and wire them up home-brew style. lots of cheap, easy examples. they'd be individual boxes as opposed to a cellar panel. although getting setup with RTD is new to me, at least in terms of making sure I've got the right wires connected to each other.
the other issue is that I'm not familiar with the specs on the PID I'd need to order for use with a basic solenoid. for inputs, its RTD/thermocouple/universal. easy enough.
but the outputs available are relay, analog, ssr/ssc, etc. not sure which one we want there for use with a regular little 24vac or dc solenoid?
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I like Omega for this stuff. Good tech support if you need help.
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Terms
Originally posted by brain medicine View Posthave a three wire thermocouple with the plastic round connector head on the new tanks. we've just used basic johnson/ranco type setups in the past, hollow thermowell and shove the probe down there, etc. haven't used these RTD type setups before so not sure what controllers are good options.
looking for decent quality three wire/RTD and aren't super expensive?
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Temp controller for use with 3 wire thermocouple connector
have a three wire thermocouple with the plastic round connector head on the new tanks. we've just used basic johnson/ranco type setups in the past, hollow thermowell and shove the probe down there, etc. haven't used these RTD type setups before so not sure what controllers are good options.
looking for decent quality three wire/RTD and aren't super expensive?Tags: None
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