IR gun and block temp
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
I am more concerned ober cyl head temps.....
BUT my IR gun is calibrated via my Fluke DVM with temp probe, which is in turn calibrated via TWO HVAC probes.....and ambient on various stats around the house.....good enough for me.....
BUT my IR gun is calibrated via my Fluke DVM with temp probe, which is in turn calibrated via TWO HVAC probes.....and ambient on various stats around the house.....good enough for me.....
Racer
Joined: Feb 2011
Posts: 252
Likes: 12
From: Fredericksburg Va.
Melting Slicks
Joined: Jun 2011
Posts: 3,116
Likes: 598
eg a D:S ratio of 1:1 means you need to be 1 inch away to measure a 1" dia spot. Then the color of the surface will also change the value of the reading. The ideal color is flat black. So what I do is create a base line at a spot and all future measurments are relative to this reading. When reading water temp the flat black rad hose works well. I compare the upper vs lower hose to see how well the rad is working.
Last edited by cagotzmann; Mar 16, 2014 at 12:04 PM.
Drifting
Joined: Oct 2012
Posts: 1,524
Likes: 61
From: Medina Ohio
Using a IR gun varies depending on the D:S ratio of the unit.
eg a D:S ratio of 1:1 means you need to be 1 inch away to measure a 1" dia spot. Then the color of the surface will also change the value of the reading. The idea color is flat black. So what I do is create a base line at a spot and all future measurments are relative to this reading. When reading water temp the flat black rad hose works well. I compare the upper vs lower hose to see how well the rad is working.
eg a D:S ratio of 1:1 means you need to be 1 inch away to measure a 1" dia spot. Then the color of the surface will also change the value of the reading. The idea color is flat black. So what I do is create a base line at a spot and all future measurments are relative to this reading. When reading water temp the flat black rad hose works well. I compare the upper vs lower hose to see how well the rad is working.
Most of the widely available IR guns are either 8:1 or 12:1, meaning a 1 inch circle at either 8in away or 12in.
A lot of people do not know this and shoot something 6 feet away, not realizing they are "highlighting" a 9in circle (8:1) which obviously would not be very accurate. It's also deceiving because of the laser pointer.
Thread Starter
Racer
Joined: Sep 2012
Posts: 459
Likes: 6
From: Fort Worth Texas
Using a IR gun varies depending on the D:S ratio of the unit.
eg a D:S ratio of 1:1 means you need to be 1 inch away to measure a 1" dia spot. Then the color of the surface will also change the value of the reading. The ideal color is flat black. So what I do is create a base line at a spot and all future measurments are relative to this reading. When reading water temp the flat black rad hose works well. I compare the upper vs lower hose to see how well the rad is working.
eg a D:S ratio of 1:1 means you need to be 1 inch away to measure a 1" dia spot. Then the color of the surface will also change the value of the reading. The ideal color is flat black. So what I do is create a base line at a spot and all future measurments are relative to this reading. When reading water temp the flat black rad hose works well. I compare the upper vs lower hose to see how well the rad is working.
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