Happy HolidaySs Giveaway - Last Sponsor Giveaway of the Year!

Come Enter the BrewDeals/FastFerment Giveaway!


Home Brew Forums > Home Brewing Beer > Electric Brewing > Many RTD's only one controller
Reply
 
LinkBack Thread Tools
Old 02-28-2012, 01:20 PM   #1
yellow
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2009
Location: Milwaukee, WI
Posts: 52
Liked 2 Times on 2 Posts

Default Many RTD's only one controller

Equipment: Just starting getting equipment together for e-HERMS. I have my old control panel which has 1 PID. I now have multiple RTD sensors in the system.

Problem: How to check temperatures with-out switching or swapping out control panel PID. It looks like a bunch of guys used switches in there setup. I basically just want to use some of the RTD's as a temp check when they are not in the control loop to understand my system better.

Question: Is there a cheap way to use an RTD just as a thermometer?

__________________

Death Or Glory Brewing

- - D.O.G. Brewing - -

yellow is offline
 
Reply With Quote Quick reply to this message
Old 02-28-2012, 02:01 PM   #2
Bobby_M
Vendor and Brewer
HBT_SPONSOR.png
Vendor Ads 
Feedback Score: 2 reviews
 
Bobby_M's Avatar
Recipes 
 
Join Date: Aug 2006
Location: Whitehouse Station, NJ
Posts: 22,186
Liked 1042 Times on 696 Posts
Likes Given: 28

Default

I know that Dwyer sells panel mount temp indicators that are NOT controllers. The question is whether any of them can take an RTD input. I believe there is some question as to whether adding a switch into the loop will cause accuracy issues. The other problem is that an RTD/display pair needs to be calibrated and switching to a different probe can be off.

I see what you're trying to do, it would be kind of cool to have a digital display with a rotary knob to cycle between all probes in the system. However, something like this is probably much easier with a BCS.

__________________
BrewHardware.com has a new website. Please check it out and let me know what you think!
New Stainless Steel Heating Elements are IN!
Did you know we are now a full service homebrew shop selling malt, hops, yeast (Wyeast), etc?
Bobby_M is offline
 
Reply With Quote Quick reply to this message
Old 02-28-2012, 02:45 PM   #3
Brickout
Feedback Score: 0 reviews
Recipes 
 
Join Date: Feb 2010
Location: Lockport, IL
Posts: 268
Liked 21 Times on 10 Posts

Default

I was just thinking about the same thing. It would be nice to have a digital display just showing the temps.

__________________
Brickout is offline
 
Reply With Quote Quick reply to this message
Old 02-28-2012, 04:18 PM   #4
yellow
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2009
Location: Milwaukee, WI
Posts: 52
Liked 2 Times on 2 Posts

Default Auber Ins

Auber Ins was very fast with getting back to me. I had just asked him the same question as the OP.

If in AUTO and you switch RTD inputs, the PID will be totally confused. If you are in manual mode switching is no problem (as long as you are not concerned about the calibration of each RTD) NOTE: if you switch make sure you have a good switch

"1) To do that, you need a very good DPDT switch that has very low contact resistance. 1 ohm of contact resistance will give 3 C or 5 F of error."
So it looks like a cheap PID is the best way to go if you have many RTD's and switch between them (just make note of differences in calibration between them - The offset is fairly consent I gather so it will just be +/- a constant that I will post next to the switch). My control panel is full, So I think I will order the cheapest Auber PID (SYL-1512A), some panel mount disconnects for the sensor wire, a switch or two, and get a box from the hardware store to house it. Not worried about using it to run anything so no SSR or heatsink required.

BOBBY M - just looked up DWYER - looks like Series 40T/40M Digital Temperature Switch would be the model, but it is $50ish compared to $30ish from Auber.
__________________

Death Or Glory Brewing

- - D.O.G. Brewing - -

yellow is offline
 
Reply With Quote Quick reply to this message
Old 02-28-2012, 05:27 PM   #5
JRems
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2010
Location: Mahopac, NY
Posts: 2,229
Liked 58 Times on 50 Posts
Likes Given: 9

Default

I had really good luck with this unit
http://www.ebay.com/itm/250560351944 it did take a long time to get from china though.
I have a pid, but can monitor the other 2 rtd's with the meter above. I just have the sensors hooked up to a on off on switch from auber, he sold me extra contact blocks so I could switch all 3 wires of the sensor.

__________________
JRems is offline
 
Reply With Quote Quick reply to this message
Old 02-28-2012, 06:23 PM   #6
yellow
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2009
Location: Milwaukee, WI
Posts: 52
Liked 2 Times on 2 Posts

Default

Quote:
Originally Posted by JRems View Post
I had really good luck with this unit
http://www.ebay.com/itm/250560351944 it did take a long time to get from china though.
I have a pid, but can monitor the other 2 rtd's with the meter above. I just have the sensors hooked up to a on off on switch from auber, he sold me extra contact blocks so I could switch all 3 wires of the sensor.
GOOD FIND! Did not even think of just looking for TEMP DISPLAY. That is definitely a cheap option. Not a huge fan of EBAY even though it would probably save me $. Tried to find the linked temp displays anywhere in the US and it is impossible (with my limited skills). Still leading towards supporting AUBER INS.

What do you mean by contact blocks? I was just gonna get the extra panel mount disconnects for the RTD's and run that through a switch to flip flop.
__________________

Death Or Glory Brewing

- - D.O.G. Brewing - -

yellow is offline
 
Reply With Quote Quick reply to this message
Old 02-28-2012, 11:06 PM   #7
wadefisher
Brew Meister
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
wadefisher's Avatar
Recipes 
 
Join Date: Jul 2009
Location: Lewistown / Dade City, PA / FL
Posts: 301
Liked 10 Times on 8 Posts
Likes Given: 1

Default

Quote:
Originally Posted by JRems View Post
I had really good luck with this unit
http://www.ebay.com/itm/250560351944 it did take a long time to get from china though.
I have a pid, but can monitor the other 2 rtd's with the meter above. I just have the sensors hooked up to a on off on switch from auber, he sold me extra contact blocks so I could switch all 3 wires of the sensor.
I have 4 of these and ordered 5 more. They are cheap and easy. My Favorite two words. I am anal on wanting to know the variation of temperature distribution in my process control. Obviously more than making beer. You wouldn't need that many for beer. You search ebay and you can find probe's pretty cheap if your willing to wait for them to shop from china. I think the probes were like $7 the display was $15 so for $22 I have a readout anywhere anyway I want. I'm actually mounting 4 into one box that will be portable to allow me to test whatever new project I'm working on to make sure there is no temperature stratification.
__________________

www DrunkMonkeyBrewWerks dot com
wadefisher is offline
 
Reply With Quote Quick reply to this message
Old 02-29-2012, 02:22 AM   #8
summerofgeorge
Feedback Score: 0 reviews
Recipes 
 
Join Date: Feb 2008
Location: Mount Laurel, NJ
Posts: 280
Liked 1 Times on 1 Posts

Default

Quote:
Originally Posted by JRems View Post
I had really good luck with this unit
http://www.ebay.com/itm/250560351944 it did take a long time to get from china though.
I have a pid, but can monitor the other 2 rtd's with the meter above. I just have the sensors hooked up to a on off on switch from auber, he sold me extra contact blocks so I could switch all 3 wires of the sensor.
Quote:
Originally Posted by wadefisher View Post
I have 4 of these and ordered 5 more. They are cheap and easy. My Favorite two words. I am anal on wanting to know the variation of temperature distribution in my process control. Obviously more than making beer. You wouldn't need that many for beer. You search ebay and you can find probe's pretty cheap if your willing to wait for them to shop from china. I think the probes were like $7 the display was $15 so for $22 I have a readout anywhere anyway I want. I'm actually mounting 4 into one box that will be portable to allow me to test whatever new project I'm working on to make sure there is no temperature stratification.
Have you had these for a while? Just wondering about their durability. This would be a nice cheaper option than going with another Auber PID just to monitor mash temps.
__________________
summerofgeorge is offline
 
Reply With Quote Quick reply to this message
Old 02-29-2012, 03:38 AM   #9
JRems
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2010
Location: Mahopac, NY
Posts: 2,229
Liked 58 Times on 50 Posts
Likes Given: 9

Default

I Only used it for 2 brews so far and it's been working fine. I don't think it's quite as waterproof as the auber pid, but I don't plan on running a hose on it. It seems pretty well made.

__________________
JRems is offline
 
Reply With Quote Quick reply to this message
Old 03-12-2012, 04:26 AM   #10
summerofgeorge
Feedback Score: 0 reviews
Recipes 
 
Join Date: Feb 2008
Location: Mount Laurel, NJ
Posts: 280
Liked 1 Times on 1 Posts

Default

Anyone know if you can hook one of the cheap ebay displays to an alarm or can you really just display the temperature?

__________________
summerofgeorge is offline
 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Suggestions for controller jsguitar Electric Brewing 225 05-23-2014 08:24 PM
50a hlt/boil controller lschiavo Electric Brewing 26 02-26-2012 09:54 PM
dual use PID controller?? RiverRat280 Electric Brewing 2 01-04-2012 12:16 AM
Controller used for Big Green Egg lonepalm Electric Brewing 5 11-29-2011 09:44 PM
Would this PWM controller work with SSR? MonkeyWrench Electric Brewing 4 10-27-2011 02:53 AM



Newest Threads

LATEST SPONSOR DEALS