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Old 01-30-2009, 11:06 PM   #16
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thermostat controlled Solenoid valve ?


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That 741 just will not go away! It's a dinosaur.
For sure, but... If it ain't broke...

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Old 01-31-2009, 07:20 AM   #17
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thermostat controlled Solenoid valve ?


I think a simple solution would be an aquastat and solenoid valve. This one has a temp range from 40-180 with a set differential of 2 deg.
http://www.pexsupply.com/product_dtl...eywell&cID=294
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Old 01-31-2009, 09:20 AM   #18
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thermostat controlled Solenoid valve ?


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I think a simple solution would be an aquastat and solenoid valve. This one has a temp range from 40-180 with a set differential of 2 deg.
http://www.pexsupply.com/product_dtl...eywell&cID=294
Buy a working unit at $73 or
spend $20 in parts and >16 hours while you pay yourself (73-20)/(>16) = <$3/hr.

What would MacGyver do?

Last edited by Yoyizit; 01-31-2009 at 09:22 AM.
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Old 01-31-2009, 09:51 AM   #19
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thermostat controlled Solenoid valve ?


I think US Dept of Labor would be getting a call since min wage is $6.55.

McGyver would just duct tape it with the foil from a piece of gum.
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Old 01-31-2009, 01:03 PM   #20
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thermostat controlled Solenoid valve ?


does McGyver do house calls.. ? I forgot my brother in-law is
a mechanical engineer... he said to take a look at this..

what you guys think ?

http://www.mcmaster.com/#3313k21/=efqv7

then I can use a ac/dc transformer to power a very basic
solenoid valve... ??
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Old 01-31-2009, 03:00 PM   #21
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thermostat controlled Solenoid valve ?


Why is everyone making this so confusing for the OP? Order a temperature controller and the RTD. The directions are with the controller. Simple and inexpensive for both controller and sensor.
OP. If you need help connecting or programming just let me know. You can PM me and I will pull up your controller on the web and walk you through it. However, if you can read you can do this yourself.
Find the cheapest one (controller) you can find. Like I said before, you need a box to mount the controller into. You mount it on the door so you can see the readout.

Stay away from thermocouples. You need special wire to use it. RTD's work on the principle of resistance and can be extended to any length you need with common THHN or THWN.
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Old 02-05-2009, 11:11 AM   #22
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thermostat controlled Solenoid valve ?


just so I'm on the same page..

J.V. in looking at the that website the therm control's all start
at like $90.. am I looking at the correct spot ? I just ask
because some other post said I could build this for like $20..maybe
I can if I built built it.. but I dont have an issue with spending
over $100 if this thing does what I want it to..

thanks..
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Old 02-06-2009, 02:54 PM   #23
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thermostat controlled Solenoid valve ?


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Originally Posted by ksauerwald View Post
just so I'm on the same page..

J.V. in looking at the that website the therm control's all start
at like $90.. am I looking at the correct spot ? I just ask
because some other post said I could build this for like $20..maybe
I can if I built built it.. but I dont have an issue with spending
over $100 if this thing does what I want it to..

thanks..
Yes, It looks like you are looking at the right web page. Keep in mind there are many brands and some could be a little more or a little less.
There is no reason to re-invent the wheel. This type of application is a tried and true simple install.
If you want I can look around for you and see what I can find. I have a supplier that sells the controls and sensors. I will give them a call and see what it will cost you.
When using the temp controller you connect two wires from the sensor to the sensor input terminals. Then you apply 120 volt to the power input terminals. This alone will give you the temp reading from the sensor. You will have to program/tell the control what type of sensor you have.
I will help if you like. Just let me know.

Ps....If you plan to insert this sensor/probe into the pipe (highly recommended) tell me what size, thread and if male or female. The sensor can be screwed into any NPT (std.) pipe fitting.
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Old 02-06-2009, 03:19 PM   #24
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thermostat controlled Solenoid valve ?


The (perhaps unquantifiable) advantages of home-built are:
it gives you a sense of mastery
you pay only for what you need
you can fix it yourself
it's less complex and possibly more reliable than factory stuff
you will learn stuff; about the thing you are building and about yourself
for some, it's fun

But, homebuilt is
not UL approved
not as safe as UL approved, but it may be safe enough

Also, people are risk-averse, risk-neutral or risk-prone. I don't recommend risk-prone people building their own megawatt controllers. They should stay in Las Vegas.
This thing is all low power, so the risk factor kind of drops out.

And this is not like a forum OP who wanted a circuit to prevent race cars from doing wheelies; in that case, the risk of a circuit failure was somewhat unpredictable and possibly large.
People somehow manage to occasionally die at racetracks regardless of the precautions taken, and I'd really hate for the forensics people to decide that my circuit caused the death of a child spectator. And if they were right, it's even worse.

The financial angle of this is easy to figure out. It's the other stuff that is difficult.

I would build the thing, but I'm not in your shoes.

Last edited by Yoyizit; 02-06-2009 at 03:27 PM.
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Old 02-06-2009, 03:32 PM   #25
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thermostat controlled Solenoid valve ?


Quote:
Originally Posted by wirenut1110 View Post
I think a simple solution would be an aquastat and solenoid valve. This one has a temp range from 40-180 with a set differential of 2 deg.
http://www.pexsupply.com/product_dtl...eywell&cID=294
Quote:
Why is everyone making this so confusing for the OP?
I don't see how this is confusing, it's a very simple inexpensive set up, hardly any wiring, no programming to do, all ready to accept a 3/4" pipe thread pretty much a plug and play.
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Old 02-06-2009, 03:55 PM   #26
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thermostat controlled Solenoid valve ?


Okay, Here is a place to start.

Fancher & Associates
Toll-Free: 800-241-5843 | Phone: 770 963-4328 | Fax: 770 995-1589
Atlanta GA.

I talked with the rep and he gave me the pricing.

1) Temperature Controller: Accepts RTD or thermocouple. One relay. LED readout. $118.15
1) RTD 1/2" NPT Male. (No leads, direct connect to RTD terminals). Up to 12" probe. $72.25

You will need to know what size pipe thread you need. I used 1/2" for checking price only.

Ask for Mark and tell him my name (John Valdes).

You may find it cheaper at automation direct. Shop apples for apples.

Ps....I did not think about your solenoid. You need one of them too.




Last edited by J. V.; 02-06-2009 at 03:58 PM.
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