 |
|
06-25-2012, 07:18 PM
|
#2781
|
|
Feedback Score: 0 reviews
Join Date: Mar 2012
Location: , MA
Posts: 1,779
Liked 125 Times on 111 Posts
Likes Given: 52
|
Quote:
Originally Posted by cwi
There have been a few discussions in this thread about using the phono jacks. From memory, no one noticed any difference in temps, or had to account for any offsets due to the extra resistance of the jack/connections. Like you guys, I was a bit surprised as well.
I remember seeing a graph for what was supposed to be a similar probe (to use as spares), but don't recall the exact Ohm/C relationship. Is it really 0.004 Ohms/C in the normal usage range? I thought is was ~1 Ohms/C, and that is why the guys didn't experience any effects from the extra connections.
Either way, the unit has a calibration setting, so it is an easy fix if needed.
|
Ah, you're right. I was remembering wrong. It's a factor of .004 per degree C, not .004 ohms. So that's 0.4 percent change in resistance per degree C. If it's a 100 ohm RTD, that means you're looking at 0.4 ohms per degree. I'm guessing one of those jacks would add maybe half an ohm at the most, probably a lot less.
Sorry I didn't see the discussion above!
From JuanMoore's response I guess this is confirmed. It adds a tiny offset but not a big deal.
|
|
|
|
06-25-2012, 07:40 PM
|
#2782
|
|
Feedback Score: 0 reviews
Join Date: Jan 2009
Location: League City, TX
Posts: 1,843
Liked 41 Times on 36 Posts
Likes Given: 41
|
Quote:
Originally Posted by JuanMoore
I added phono jacks to the single stage controllers similar to the STC-1000 that I use in my HERMS, and only had to adjust the temp calibration by 1°F. I then added another connection and doubled the wire length, which required me to adjust them by another 2°F, for a total change of 3°F.
|
Mind posting the make and model number for your single-stage? I'm curious if it's the same unit I have.
Thanks.
|
|
|
|
|
06-25-2012, 08:05 PM
|
#2784
|
|
Feedback Score: 0 reviews
Join Date: Jan 2009
Location: League City, TX
Posts: 1,843
Liked 41 Times on 36 Posts
Likes Given: 41
|
Quote:
Originally Posted by JuanMoore
|
Interesting... Mine looks like this:
but displays in C and has a model # (WH7016C):
Does yours have the same wiring as mine? Just curious. Thanks! |
|
|
|
|
06-25-2012, 08:41 PM
|
#2785
|
|
Feedback Score: 0 reviews
Join Date: Jul 2011
Location: Richardson, Texas
Posts: 951
Liked 45 Times on 35 Posts
Likes Given: 3
|
has anyone measured the resistance of the temperature probe, or figured out what type it is? I would like to try one of these controllers but I want to make a waterproof/food grade temp probe.
|
|
|
|
|
06-25-2012, 08:59 PM
|
#2786
|
|
Señor Member
Feedback Score: 0 reviews
Join Date: Oct 2009
Location: Tucson, Az
Posts: 11,189
Liked 2548 Times on 2497 Posts
Likes Given: 15
|
Quote:
|
Originally Posted by barrooze
Does yours have the same wiring as mine? Just curious. Thanks!
|
Yep, looks like the same wiring.
Quote:
|
Originally Posted by BetterSense
has anyone measured the resistance of the temperature probe, or figured out what type it is? I would like to try one of these controllers but I want to make a waterproof/food grade temp probe.
|
The specs for the probe are listed in the manual that comes with it, and can also be found online. I'm on my phone, but I'm sure someone can post specs for you. FWIW the probe that comes with the single stage units is SS, unlike the oval rubber blob that comes with the STC-1000.
__________________
Keezer Soze
Yuri rubs it out with 60 grit... wouldn't even feel a tenga egg. -Randar
, place entry ox dixla to suck. Fcxk fwnpoo and passed. Hel an my spupid ass. OK. - TXCrash
|
|
|
|
|
06-25-2012, 09:24 PM
|
#2787
|
|
Feedback Score: 0 reviews
Join Date: May 2012
Posts: 181
Liked 1 Times on 1 Posts
|
Quote:
|
Originally Posted by barrooze
Interesting... Mine looks like this:
but displays in C and has a model # (WH7016C):
Does yours have the same wiring as mine? Just curious. Thanks!
|
I have the same WILLHI controller that I am trying to wire up to a single receptacle, having one outlet for the keezer and the other outlet for a lamp |
|
|
|
|
06-26-2012, 02:21 AM
|
#2789
|
|
Feedback Score: 0 reviews
Join Date: Jul 2011
Location: Richardson, Texas
Posts: 951
Liked 45 Times on 35 Posts
Likes Given: 3
|
so really, it's a 10k thermistor, not a platinum element. Cheap, but good enough for a thermostat I guess.
|
|
|
|
|
06-27-2012, 12:41 AM
|
#2790
|
|
Feedback Score: 0 reviews
Join Date: May 2012
Posts: 181
Liked 1 Times on 1 Posts
|
I got my WILLHI temp controller wired in tonight, the outlet is not 1/2 always hot and 1/2 controlled by controller, but that's ok. The temp is set at 3° C right now, so I'll monitor it overnight to see how it does. A BIG THANK YOU goes out to everyone here on the boards for the advice and wiring help.
|
|
|
|
| Thread Tools |
|
|
| Display Modes |
 Linear Mode
|
|
|
|
.gif-1367621329.gif)
