R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 07-16-2012, 06:24 PM   #1
Tech Elite
 
bvoltz's Avatar
 
Join Date: Jun 2005
Location: Bedtime with Teddi
Posts: 3,635
Trader Rating: 44 (100%+)
Default How to verify my temp gauge is correct?

I have a new Infrared Temp Gauge/Gun, which seem to read 50 hotter then other temp gauges around the 180 mark. Does anyone know of a way for me to verify if my new gauge is measuring correctly or if it really off... What is interesting is it measures correctly at lower temperature, it seem to be off at higher temps.

Any suggestion of how to verify the temp it reads to the real temp?
bvoltz is offline   Reply With Quote
Old 07-16-2012, 07:23 PM   #2
Tech Regular
 
Team STPN's Avatar
 
Join Date: Mar 2008
Location: Roseville, Cal
Posts: 321
Default

Boiling water is 213 degrees and water with lots of ice cubes are at 32 degrees.... your choice
Team STPN is offline   Reply With Quote
Old 07-16-2012, 08:32 PM   #3
Tech Master
 
jsinclair's Avatar
 
Join Date: Jul 2011
Location: rice lake, wi
Posts: 1,036
Trader Rating: 3 (100%+)
Default

If your lazy you can point it at your thermostat
jsinclair is offline   Reply With Quote
Old 07-16-2012, 08:43 PM   #4
Tech Elite
 
andrewdoherty's Avatar
 
Join Date: Jan 2005
Location: ★Wylie, TX★
Posts: 3,776
Trader Rating: 47 (100%+)
Default

Make sure the lens cover on it is clean. I know you said its new, but it only takes a day in your pocket to get covered in lint, which reads less acurately the hotter the item your temping gets. It also reads more accurately closer to room temp.
__________________
"Whether you think you can, or think you can't, you're right." -Henry Ford
"[Driving] Genius is 1% inspiration, and 99% perspiration" -T.A. Edison
|◤Hobbywing◢|◤SpeedzoneUSA.com◢|◤Pro-One◢|
|◤ReflexRacing.net◢|◤Protoform◢|◤AVID R/C◢|
andrewdoherty is offline   Reply With Quote
Old 07-16-2012, 08:52 PM   #5
Tech Elite
 
NolanP's Avatar
 
Join Date: Apr 2012
Location: Westmont
Posts: 2,426
Trader Rating: 8 (100%+)
Default

Boiling water sounds the best area due to the fact he said it reads very well at lower temps just not higher temps. The only other thing I could think of is if your grilling and got a meat temp gauge and compare. Just hope to god that the meat one is accurate.
__________________
Mod Touring Car
Mod 12th
Nitro TC
Nitro GT
Wheeler and Mod Buggy
NolanP is offline   Reply With Quote
Old 07-16-2012, 09:31 PM   #6
Tech Elite
 
artwork's Avatar
 
Join Date: Sep 2004
Location: Thornton, CO
Posts: 3,109
Trader Rating: 62 (100%+)
Default

Water does not boil at the same temp everywhere...might want to bounce it off of your home thermostat.
__________________
Sanwa | R1 Wurks | Avid | 2mm Designs
artwork is offline   Reply With Quote
Old 07-16-2012, 10:31 PM   #7
Tech Elite
 
bvoltz's Avatar
 
Join Date: Jun 2005
Location: Bedtime with Teddi
Posts: 3,635
Trader Rating: 44 (100%+)
Default

Quote:
Originally Posted by andrewdoherty View Post
Make sure the lens cover on it is clean. I know you said its new, but it only takes a day in your pocket to get covered in lint, which reads less acurately the hotter the item your temping gets. It also reads more accurately closer to room temp.
This what is what is going on... At 180, it reads 50 degrees hotter then the correct temp, but at 90 it reads correctly.... This is the 3rd temp gauge in 2 weeks all of them are doing the same thing, when I compare it to a calibrated temp gun it clearly is way off, when reading the motor temp...

Have check to make sure it is clean.....
bvoltz is offline   Reply With Quote
Old 07-16-2012, 10:35 PM   #8
Tech Elite
 
bvoltz's Avatar
 
Join Date: Jun 2005
Location: Bedtime with Teddi
Posts: 3,635
Trader Rating: 44 (100%+)
Default

Quote:
Originally Posted by Team STPN View Post
Boiling water is 213 degrees and water with lots of ice cubes are at 32 degrees.... your choice
Interesting... ran a cup of water though the Kreug machine, which makes the water 192, into a cup and it reads the water at 132, which is the same temp as the cup... Dropped in a food temp gauge it read 188.... Water does not have the reflective properties for Infrared temp gauges... I Google it... that is how I know this is not reasonable test for these Infrared temp guns.... They need to be able to reflect the Infrared back to the gauge. I do not have a problem with it from 110 and below... so ice will not help it reads an ice cube correctly... it is higher temp is when it go inaccurate....

I will try it with my coffee tomorrow maybe I will get luck and it work.... I thought about the hot water pipe but my hot water does not get to 200 degrees....

Last edited by bvoltz; 07-16-2012 at 10:47 PM.
bvoltz is offline   Reply With Quote
Old 07-16-2012, 10:37 PM   #9
Tech Elite
 
bvoltz's Avatar
 
Join Date: Jun 2005
Location: Bedtime with Teddi
Posts: 3,635
Trader Rating: 44 (100%+)
Default

Quote:
Originally Posted by NolanP View Post
Boiling water sounds the best area due to the fact he said it reads very well at lower temps just not higher temps. The only other thing I could think of is if your grilling and got a meat temp gauge and compare. Just hope to god that the meat one is accurate.
Grill temp gauges can have a variance of 50 Degrees... So will your oven.... Nothing like coming off the track and seeing your temp gun show 220... Then you figure out it was 170 after I tossed it the garbage because I thought I wreck the motor...

Last edited by bvoltz; 07-16-2012 at 10:50 PM.
bvoltz is offline   Reply With Quote
Old 07-16-2012, 11:54 PM   #10
Tech Regular
 
narcotiks's Avatar
 
Join Date: Dec 2011
Location: Melbourne, Australia
Posts: 452
Trader Rating: 8 (100%+)
Default

Change the battery see if it works ?
narcotiks is offline   Reply With Quote
Old 07-17-2012, 05:39 AM   #11
Tech Elite
 
andrewdoherty's Avatar
 
Join Date: Jan 2005
Location: ★Wylie, TX★
Posts: 3,776
Trader Rating: 47 (100%+)
Default

Maybe the default emissivity for the temp gauge you're using is screwy? Google what the emissivity for a particular surface is and check your gauge if it is adjustable...?
__________________
"Whether you think you can, or think you can't, you're right." -Henry Ford
"[Driving] Genius is 1% inspiration, and 99% perspiration" -T.A. Edison
|◤Hobbywing◢|◤SpeedzoneUSA.com◢|◤Pro-One◢|
|◤ReflexRacing.net◢|◤Protoform◢|◤AVID R/C◢|
andrewdoherty is offline   Reply With Quote
Old 07-17-2012, 05:49 AM   #12
Tech Lord
 
wingracer's Avatar
 
Join Date: Nov 2007
Posts: 12,861
Trader Rating: 24 (100%+)
Default

Quote:
Originally Posted by andrewdoherty View Post
Maybe the default emissivity for the temp gauge you're using is screwy? Google what the emissivity for a particular surface is and check your gauge if it is adjustable...?
That's what I was thinking too, you beat me to it

If you have an old motor laying around, dunk the can into a pot of boiling water, let it get good and hot, pull it out (pliers are your friend) and check it.
__________________
Sean. Certified speed crazed mowron.
Team Shepherd USA
www.ashfordhobby.com
wingracer is offline   Reply With Quote
Old 07-17-2012, 07:43 AM   #13
Tech Elite
 
bvoltz's Avatar
 
Join Date: Jun 2005
Location: Bedtime with Teddi
Posts: 3,635
Trader Rating: 44 (100%+)
Default

This is getting interesting... per the manual: for the TGX1 unit....

"The emissivity can be adjusted to allow the TGX1 to be used for a variety of other uses other than taking temperature readings of nitro engines. The emissivity must be set correctly for the material being measured or the
temperature reading may not be accurate.
A search of the internet will show many links for ‘emissivity tables’. Keep in mind these tables are for different types of materials in general, and are not geared directly for R/C products. In most cases, only minor adjustments to the emissivity setting might be needed for different types of engine heads. If
unsure what emissivity setting to use, the default setting of 1.00 (100E) typically provides the most accurate temperature reading for nitro engines when used as shown in the illustration at left.
The emissivity of the temperature gauge can be changed from 0.05 (5E) to 1.00 (100E). To change the emissivity setting, press the MODE button 3 times then press MEASURE button once to advance the setting one at a time. Holding down the MEASURE button will scroll through the entire range of settings. Once the unit reaches 100E, it will start over at 5E and go through the entire range again. Once the desired emissivity setting is reached, press the MODE button once to lock in the setting and immediately return you to the main screen. This setting will be retained for future use or until it is changed manually."

So I change this setting to get it to read correctly on a cup of coffee, then took a reading on an ice cube which was -4....

So it would be interesting to see what people have this setting at that is reading it correctly... And how many have these types of units, that think they are reading correctly and they are not.....
bvoltz is offline   Reply With Quote
Old 07-17-2012, 08:02 AM   #14
Tech Elite
 
bvoltz's Avatar
 
Join Date: Jun 2005
Location: Bedtime with Teddi
Posts: 3,635
Trader Rating: 44 (100%+)
Default

To add to this... I just found this on the web at: Link

"For R/C use, there are 3 commonly used
emissivity settings:

1) Aluminum: Sandblasted (standard car and airplane engines, not anodized) set the emissivity at 21E.

2) Aluminum: Anodized (for colored car and airplane engines, may be powder coated) set the emissivity at 77E.

3) Batteries Packs (with or without covering) and Airplane Covering: Leave at default 95E."

Make me think that a number of people are taking incorrect temps because the temp gun's settings.

The other option I keep reading over and over, is to place a small sticker on the can and take the temps from that....
bvoltz is offline   Reply With Quote
Old 07-17-2012, 08:56 AM   #15
Tech Lord
 
wingracer's Avatar
 
Join Date: Nov 2007
Posts: 12,861
Trader Rating: 24 (100%+)
Default

Quote:
Originally Posted by bvoltz View Post
So I change this setting to get it to read correctly on a cup of coffee, then took a reading on an ice cube which was -4....
Remember an ice cube straight out of the freezer WILL be below freezing. Once it's melting, then it should read 0C.

But who cares about the temp of an ice cube or coffee. What matters is accurate temp of the motor so again, boil an old can and check it.
__________________
Sean. Certified speed crazed mowron.
Team Shepherd USA
www.ashfordhobby.com
wingracer is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 01:26 AM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net