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Unread 12-06-2012, 04:16 PM   #1
BobM
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Default WSM Thermometer Mod Question

Hi all, doing some mods to my WSMs.

I plan on permanently mounting an analog thermometer in the middle section of my WSM. I plan on mounting it above the door, in the center, half way from the door top to the top lip.

I plan on getting a Tel-Tru BQ225, with a 2" dial.

Tel-Tru has a 2 1/2" stem and a 4" stem version. The 4" stem version will get the tip of the probe somewhat away from the outside of the cooker, which is good. I am concerned that it might get in the way when I use the lower rack, especially on the 18 1/2" WSM, or grease from the meat on the top rack might drip on it making it give false readings.

Questions:
Will the 4" stem length unit better reflect the cooker temperature or will the 2 1/2" stem length be fine?
Will the 4" stem length unit get in my way when I cook on the lower grate or is dripping grease a problem?
What do you UDS cookers use?

Thanks in advance,

Bob
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Unread 12-06-2012, 05:06 PM   #2
pal251
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Could you tent a piece of foil over the top but not touching the thermometer so grease wouldn't directly hit it. I would like to do a handle mod myself, I just can't fathom drilling into my newer $400 wsm.
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Unread 12-06-2012, 05:12 PM   #3
Toast
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Only prob I see with the 2 1/2 is that more of the probe surface will "see" the coals in the gap between the water pan and wall. Could cause higher readings than actual grill temp.

When you go to drill, use some blue painter's tape over the drill spot to avoid chipping the enamel.

Good Luck!
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Unread 12-06-2012, 06:29 PM   #4
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In my drum I use a thermometer with a 12" long probe so it can read the center temp and not the edge. Those short probes will give an inaccurate reading in the WSM as the sides are hotter than the center.
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Unread 12-06-2012, 07:28 PM   #5
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Are you locked into the thermo being mounted in the center section?

All of them that I have done have been in the dome opposite the vent. I get pretty good results, and the probe is usually out of the way of the food. A thermo in the center section won't be.

If you go with the center, I'd go woth the longer probe. The shorter one might have a negative impact on accuracy.

Whatever you do, mask off the area where you're gonna drill and drill at lower RPMs. Helps to limit porcelain chippage.
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Unread 12-06-2012, 09:28 PM   #6
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I am assuming the probe will be above the grill grate. If you want to use the shorter probe and my assumption is correct. Why not get a thin piece of flat stock metal to lay on the grate under the probe. That way you could deflect the heat from the heat column around the edge. I am sure it will still run hotter then the center but it would help some.

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Unread 12-07-2012, 02:39 PM   #7
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why not use the grommets and just insert and remove your thermometer at will?
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Unread 12-07-2012, 02:59 PM   #8
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Quote:
Originally Posted by bobaftt View Post
why not use the grommets and just insert and remove your thermometer at will?
I've actually been doing that, but I want a more permanent solution.
If I'm using my ET-732, and use the grommet for the probe wires, I can't also use it for an analog thermometer.

Bob
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Unread 12-07-2012, 03:53 PM   #9
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Ok, I know this sounds crazy, but I'll share my 2 cents. I had 4, Tel Tru BBQ's analog dials as you are wanting to use. I placed them in above the grate locations on a custom build. The temps were always off because you can never really get to the center where it's much hotter than the probe can reach. Then after a month, the moisture / humidity made them un readable. I ripped them all out, HUGE waste of money. I'm still pissed, and that was a year ago. They looked good, but that was it. Then I did the unthinkable. I went to home depot, in the BBQ section and bought one of those metal turkey fryer analog thermometers for about 4 dollars. The one with the really long stem, not sure but 10-12 inches approximately. This is the best probe on the market, the stem reaches the center of most every pit, is very accurate, can take the high temps because is for a turkey fryer, and is dirt cheap. If it breaks, 4 more dollars, but it's lasted a year already, better than my 60 dollar probes that break for sure.
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Unread 12-07-2012, 07:07 PM   #10
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Here is what I have been planning to do with my WSM/Cajun Bandit.

Mount the Thermometer holder from a Genesis gas grill and use either a Weber dual purpose thermometer or a Tel-Tru Genesis replacement (calibrateable) mounted to the center section. Removable if I want to use a remote probe in place of the thermo!

Mount one just below the grate at each level- much cheaper than aftermarket grommets.
Schematic for the Genesis, http://help.weber.com/schematics/bro...1&model=231001

Thermo holder (#40) is relatively cheap from Weber parts, and a replacement thermo (#39) is @ $13 and a Tel Tru is a few dollars more.

http://store.weber.com/Items/Accesso....aspx?pid=1106
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