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vadimr
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Joined: 18 Nov 2011
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Espresso: Silvia v3
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Posted Mon Nov 19, 2012, 11:35am
Subject: cheap dual setpoint pid controller?
 

I've searched and searched and I'm yet to find a relatively cheap dual setpoint pid controller, they are all in the $200+ range. I realize I can use the alarm output for the steam control but was wondering if anyone knows of a cheap Chinese model that actually has a true dual setpoint?

-Vadim
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D4F
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Posted Mon Nov 19, 2012, 12:31pm
Subject: Re: cheap dual setpoint pid controller?
 

I have not found a cheap PID with 2 PID controlled points.  You would not want steam PID controlled as it would be slower to get there.  Alarm is adequate, probably best, for steam clicking on and off 1 degree apart on the alarm.  I offer that not knowing your use or machine, so YMMV.

I do not see your location, but I found Auber inexpensive enough for a PID.  Many of the Chinese generics are similar but instructions may be difficult.

 
D4F also at
http://www.gaggiausersgroup.com/
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CraigA
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CraigA
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Posted Mon Nov 19, 2012, 1:18pm
Subject: Re: cheap dual setpoint pid controller?
 

Is this what you're looking for? Dual Digital F/C PID Temperature Control Controller for $36.50!

7 different Dual Output combinations with 1 relayed output and 1 SSR control voltage output.

 
http://twitter.com/CoffeegeekCraig
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JGG
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Posted Mon Nov 19, 2012, 1:22pm
Subject: Re: cheap dual setpoint pid controller?
 

By dual setpoint, do you mean two separate control loops (i.e. two sensors, two sets of outputs)?  Or a unit that stores two setpoints and selects one of them based on some external event?

If the application is for steam mode on a SBDU espresso machine, I agree with D4F that simple ON/OFF control at the steam setpoint, such as is provided by an alarm output, works better than PID control.

If you truly need PID control at selectable setpoints, I think maybe Delta offers a 1/16DIN controller that can sense an external event (like closing a switch).  Otherwise, look on eBay for a used Watlow 96A1-xxxx-xxxx controller.

Jim
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CraigA
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CraigA
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Location: Rexdale, Toronto, Ontario, Canada.
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Espresso: PID/PressureMod 2001...
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Posted Mon Nov 19, 2012, 1:26pm
Subject: Re: cheap dual setpoint pid controller?
 

JGG Said:

By dual setpoint, do you mean two separate control loops (i.e. two sensors, two sets of outputs)?  Or a unit that stores two setpoints and selects one of them based on some external event?

Posted November 19, 2012 link

What I was wondering also.

 
http://twitter.com/CoffeegeekCraig
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coffeeee
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Posted Tue Nov 20, 2012, 4:04am
Subject: Re: cheap dual setpoint pid controller?
 

a used Watlow 96 series controller is a great choice
it is a reliable controller and has many options to pick from
it you have the patient, you can buy one on eBay for less then $50

You can look at a small guide I have made for the Watlow 96/97 controller
that will give you detailed info of this great model

Have fun
Avi

 
Coffee is not a drink...it is an adventure...
Author of Rancilio Silvia Mega-Mod and Rocky Timer Mod (see my website)
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vadimr
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Posted Tue Nov 20, 2012, 4:52am
Subject: Re: cheap dual setpoint pid controller?
 

JGG Said:

By dual setpoint, do you mean two separate control loops (i.e. two sensors, two sets of outputs)?  Or a unit that stores two setpoints and selects one of them based on some external event?

If the application is for steam mode on a SBDU espresso machine, I agree with D4F that simple ON/OFF control at the steam setpoint, such as is provided by an alarm output, works better than PID control.

If you truly need PID control at selectable setpoints, I think maybe Delta offers a 1/16DIN controller that can sense an external event (like closing a switch).  Otherwise, look on eBay for a used Watlow 96A1-xxxx-xxxx controller.

Jim

Posted November 19, 2012 link

Jim,

Yes I was just looking for dual setpoint that can be triggered by external event, such as shorting a few pins. Yes the idea was to get a better steam control on my single boiler machine (Silvia). I guess I'll just stick with the alarm output, what I don't like about that is that I either need an alternative low voltage setup or a 2nd SSR.
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tasseloff
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Joined: 18 Jan 2009
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Posted Tue Nov 20, 2012, 5:40am
Subject: Re: cheap dual setpoint pid controller?
 

I was also in that situation and finally settled with the second SSR (AC SSR, which are harder to find actually). It seems the auber PID with steam control actually uses a tweaked controller to control the steam so you may wish to look at that option (I'm not sure if they use 1 or 2 SSRs).

Anyhow, the second SSR setup was very easy to install, and I believe it would be the same if you used a power adapter instead. Its just a matter of not cluttering the machine too much, but its the cheapest option I could find.
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D4F
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Espresso: Gaggia Classic PID
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Posted Tue Nov 20, 2012, 8:55am
Subject: Re: cheap dual setpoint pid controller?
 

vadimr Said:

Yes I was just looking for dual setpoint that can be triggered by external event, such as shorting a few pins. Yes the idea was to get a better steam control on my single boiler machine (Silvia). I guess I'll just stick with the alarm output, what I don't like about that is that I either need an alternative low voltage setup or a 2nd SSR.

Posted November 20, 2012 link

I am not sure why it is objectionable.  I used this diagram and a small cell phone charger inside the machine case.

http://www.skenedesign.com/Silvia/  

Tasseloff did more like this version with 2 SSR's

http://coffeegeek.com/forums/espresso/machinemods/546343

The Auber kit uses a proprietary version of the same PID and activates the SSR through the alarm function without a DC source or second SSR if I have read the instructions correctly.  Try email to Auber. IIRC, he has an AC to DC converter/switcher added or activated in the PID.

I did DIY and used the voltage source, in fact I have 2 DC sources inside the machine and controlled by the machine switches (external events), and 3 SSR inputs and diodes, like Skene.

http://coffeegeek.com/forums/espresso/machinemods/571792

 
D4F also at
http://www.gaggiausersgroup.com/
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