Quick explanation why your gun is probably not accurate

Discuss substrates, lighting, heating, enclosure building ideas, share enclosure photos, and talk about any other enclosure-related topics.

Quick explanation why your gun is probably not accurate

Postby kingofnobbys » Fri Mar 23, 2018 6:35 pm

[TOPIC AUTO-LOCKED DUE TO INACTIVITY]

Very common for a gun to be recommended to measure temperatures in a viv , BUT likely the temperature gun is :
>>> not being used correctly ( if reading high you may be measuring ONLY surface temperatures and be introducing a systematic error due to the gun seeing the reflection of the basking globe on a "reflective" surface , an error called a specular error.
Image
>>> incorrect emissivity setting programmed into the gun for the surface being measured by the , if the surface actually has a higher emissivity , the temperature measurement will be too low, and conversely if the emissivity of the surface is actually lower, the temperature will be too high :
Image
and
>>> very common for amateurs to shoot the temperature from TOO FAR AWAY , it is very important that the area you to measure FILLS the measurement spot , if you are too far away , the gun will see & measure background too , which may be either a lot cooler (most likely in a viv) or a lot hotter , and it will simply indicate the average. SO if the gun has a spot specification of 12:1 , this means the spot is 1 inch in diameter at 12 inches from the surface, so your spot needs be larger than the measurement spot ( you come closer ) to ensure the spot is filled.

The digital thermometer is the measurement I'd take as being reliable and accurate provided it's had time to reach thermal equilibrium and is either
>> in physical contact the surface if you want to measure the surface temperature
>> suspended in the media (air) if you want only radiant heat and air temperature.
Last edited by kingofnobbys on Mon Jul 23, 2018 10:23 am, edited 3 times in total.
CBDs: Cleopatra & Caesar born 28Jan19.
Puff (RIP 10Dec15),Rex (RIP 16Mar17),Toothless (RIP 26Nov17).Peppa (RIP 22Mar19).
EBTSs : George & Mildred (born july 2010).
EWSs : , Fluffy (F) rescued injured by lawnwacker 14Nov17, Gutzy (F) rescued 27Sep19 - RIP 3Aug20 (est 12 yo), Wriggles (F) - injured rescue, over 8 yrs old, RIP 2Feb16 old age. Lucky juvenile (M) - cat attack rescue (lost r-eye, broken r-lower jaw), fatal SI RIP 21Jul2010.
kingofnobbys
BD.org Sicko
 
Posts: 12625
Joined: Tue May 12, 2015 10:56 pm
- Advertisement -
- Advertisement -

Re: Quick explanation why your gun is probably not accurate

Postby AHBD » Mon Mar 26, 2018 10:51 am

Very interesting. I can see that it would be very easy to get the wrong temps. with ALL of the different types of thermometers because people use them differently and there is probably variation in reliability of individual products as well.
AHBD
BD.org Sicko
 
Posts: 25724
Joined: Sat Mar 06, 2010 3:20 am
- Advertisement -
- Advertisement -


Return to Enclosures

Who is online

Users browsing this forum: Majestic-12 [Bot]