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May 14-17, 2012
Location:
Restoration Consultants, Inc.
3284 Ramos Circle
Sacramento, CA 95827
Cost: $1695
> Download the Flyer
SPACE IS LIMITED! PLEASE REGISTER AT YOUR EARLIEST CONVENIENCE TO GUARANTEE A SEAT IN THE COURSE. TO REGISTER CONTACT:
Jessica Linares
408-342-1200
seminar@ewingfoley.com
*Sponsored by Ewing-Foley, Inc
How’s your comfort level in thermography?
(The above comments represent my opinion).
Rod Hoff / Restoration Consultants Inc
Thermography Instructor / IR camera sales
3284 Ramos Circle, Sacramento CA 95827
toll free 888-617-3266 ext 301
fax 916-736-1134
rhoff@restcon.com
Provider of Fluke TiS, TiR, TiR1, Ti, Ti25, TiR27, Ti27, TiR29, Ti29, TiR32, Ti32, TiR3, and TiR4 infrared cameras.
See DEMO www.moistureview.com/demo.html
Fluke proudly introduces five new thermal imagers specifically designed to help troubleshoot and resolve problems even more efficiently than before.
Read about auto focus and video recording at: http://www.moistureview.com/products/tir125-tir110-building-diagnostic-and-the-ti100-general-use-thermal-imagers
Purchasing an ir camera can pay off. Use our new Break-Even Calculator to calculate how long it will take you to break-even, and how much of a profit you can make after the camera is paid for.
Check it out!
Every target surface that you point your infrared camera at has a surface characteristic of emissivity. How’s your comfort level with that subject? I talked about this a little in blog #015 (Radiosity! What is it?) As you might remember, there are three components to radiosity: (1) emissivity (2) reflectivity (3) transmissivity. All three have to equal one. So, if the emissivity is 0.95 and the transmissivity is 0.00 the reflectivity is what? Yes, 0.05.
How important is it to understand emissivity? Well, how important is the accuracy of your temperature reading? Your infrared camera, if it is a radiometric camera, gives you a surface temperature reading, right? Let’s say your IR camera is in perfect calibration and the reading is minus 3° F. Is that an accurate temperature? Maybe! Maybe not! The target surface characteristic called “emissivity” has a major influence on it. When you hear the word “emissivity”, what comes to mind? The thing that comes to my mind is the word “emit”. Target surfaces vary in the amount of infrared radiation that they “emit”. The higher the emissivity of the surface, the more infrared radiation it emits. The more it emits the more accurate the temperature reading from you camera. Please notice that I have emphasized the word “surface”. Why? Because an infrared camera reads only the infrared radiation that is emitted from the “surface”. For example, on a painted wall the camera reads the infrared radiation emitted from the last coat of paint, not anything below that. Polished chrome, for example has a very, very low emissivity of 0.05 (high reflectivity). Paint has a very, very high emissivity of 0.95 (low reflectivity). What, then, is the emissivity of painted chrome? It’s the same as the emissivity of “paint” because that is what constitutes the surface. Notice the same image I used in blog #015, the image of the car with a chrome surround on the windshield.
 Taken with Fluke IR Fusion camera The ambient temperature is around 110° F. The painted door panel is 144.1 ° F. The polished chrome surface is reading -3° F. The paint, due to the high emissivity of paint (.95), is giving us a relatively accurate temperature surface temperature of 144.1° F. The polished chrome, with its very low emissivity (.05), is giving us a very inaccurate temperature of minus 3° F.
A good question to ask yourself when pointing an infrared camera at a surface is: “What is the emissivity of this material?” If you are involved in moisture investigations or building envelope investigations you are most often viewing high emissivity surfaces. Be careful about aluminum HVAC surfaces, though. If you are involved with industrial, manufacturing, mechanical investigations you will have to be more aware of the varying surface emissivities. In the next blog I will address how you can change the emissivity of a surface to achieve accuracy.
Call me any time for further discussions on these subjects.
How’s your comfort level in thermography?
(The above comments represent my opinion).
Rod Hoff / Restoration Consultants Inc
Thermography Instructor / IR camera sales
3284 Ramos Circle, Sacramento CA 95827
toll free 888-617-3266 ext 301
fax 916-736-1134
rhoff@restcon.com
Provider of Fluke TiS, TiR, TiR1, Ti, Ti25, TiR27, Ti27, TiR29, Ti29, TiR32, Ti32, TiR3, and TiR4 infrared cameras.
See DEMO www.moistureview.com/demo.html
Posted in building envelope, Fluke, general, infrared cameras, Thermography
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Tagged Fluke infrared camera, Fluke infrared cameras, Fluke IR camera, Fluke Ti27, Fluke Ti29, Fluke Ti32, Fluke TiR, Fluke TiR1, infrared camera, infrared cameras
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Review Blog #060, #061 & #062 and continue with the exercise.
Cool wall cavity areas (darker color) and warmer wood framing (lighter color):
Scenario #7 – viewed from the outside during the cooling season (summer) – are the bays insulated?
Scenario #8 – viewed from the inside during the cooling season (summer) – are the bays insulated?
 exercise cool bay scenario (Answers:)
Scenario #7 – no insulation
Scenario #8 – insulated
The intent of these 8 scenarios in these four blogs (#060, #061, #062, #063) was to give you an opportunity to practice thinking on a molecular level. Hopefully this has raised your thermography comfort level.
How’s your comfort level in thermography?
(The above comments represent my opinion).
Rod Hoff / Restoration Consultants Inc
Thermography Instructor / IR camera sales
3284 Ramos Circle, Sacramento CA 95827
toll free 888-617-3266 ext 301
fax 916-736-1134
rhoff@restcon.com
Provider of Fluke TiS, TiR, TiR1, Ti, Ti25, TiR27, Ti27, TiR29, Ti29, TiR32, Ti32, TiR3, and TiR4 infrared cameras.
See DEMO www.moistureview.com/demo.html
Posted in building envelope, Fluke, general, infrared cameras, Thermography
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Tagged Fluke infrared cameras, Fluke IR camera, Fluke Ti27, Fluke Ti29, Fluke Ti32, Fluke TiR, Fluke TiR1, infrared
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Review Blog #060 & #061 and continue with the exercise.
(Warm wall cavity areas (lighter color) and wood framing (darker color):
#5 scenario: viewed from the outside during the cooling season (summer) – Are the bays insulated?
#6 scenario: viewed from the inside during the cooling season (summer) – Are the bays insulated?
 Exercise warm bay scenario (Answers:)
Scenario #5 – insulated
Scenario #6 – no insulation
Look for Scenario #7 and #8 in blog #063 on Nov 16.
How’s your comfort level in thermography?
(The above comments represent my opinion).
Rod Hoff / Restoration Consultants Inc
Thermography Instructor / IR camera sales
3284 Ramos Circle, Sacramento CA 95827
toll free 888-617-3266 ext 301
fax 916-736-1134
rhoff@restcon.com
Provider of Fluke TiS, TiR, TiR1, Ti, Ti25, TiR27, Ti27, TiR29, Ti29, TiR32, Ti32, TiR3, and TiR4 infrared cameras.
See DEMO www.moistureview.com/demo.html
Posted in building envelope, Fluke, general, infrared cameras, Thermography
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Tagged Fluke infrared camera, Fluke infrared cameras, Fluke Ti27, Fluke Ti29, Fluke Ti32, Fluke TiR, Fluke TiR1, infrared camera
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Review Blog #060 and continue with the exercise.
Cool wall cavity areas (darker color) and warmer wood framing (lighter color):
Scenario #3 – viewed from the outside during the heating season (winter) – is the wall insulated?
Scenario #4 – viewed from the inside during the heating season (winter) – is the wall insulated?
 Excercise cool bay scenario (Answers)
Scenario #3 – Insulated
Scenario #4 – No insulation
Look for Scenarios #5 and #6 in Blog #062 on Nov 9.
How’s your comfort level in thermography?
(The above comments represent my opinion).
Rod Hoff / Restoration Consultants Inc
Thermography Instructor / IR camera sales
3284 Ramos Circle, Sacramento CA 95827
toll free 888-617-3266 ext 301
fax 916-736-1134
rhoff@restcon.com
Provider of Fluke TiS, TiR, TiR1, Ti, Ti25, TiR27, Ti27, TiR29, Ti29, TiR32, Ti32, TiR3, and TiR4 infrared cameras.
See DEMO www.moistureview.com/demo.html
Posted in building envelope, Fluke, general, infrared cameras, Thermography
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Tagged Fluke infrared cameras, Fluke IR camera, Fluke Ti27, Fluke Ti29, Fluke Ti32, Fluke TiR, Fluke TiR1, infrared camera
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Are you comfortable using your infrared camera to investigate insulation issues? I’m going to give you a method to determine if the wall is fully insulated or not using your infrared camera. You start with two basic steps: Step #1-Identify the heat source and thus the direction of the heat flow! Step #2-Identify the path of least resistance, the lowest R-factor. Inspecting walls for insulation issues with an infrared camera requires an understanding of the 2nd Law of Thermodynamics. That law defines the direction of heat flow and is simple: hot goes to cold. The speed with which “hot goes to cold” is affected by at least a couple of factors: (1) the ∆T from surface to surface (the greater the temperature difference, the greater the conductive speed) and (2) the R-factor (the greater the R-factor or R-value, the slower the conductive speed). In a fully insulated wall the framing members would be the path of least resistance and the bay would be the path of most resistance to heat flow. In a wall that does not have insulation the bay would have the lower R-value and thus be the path of least resistance and the framing members would have the higher R-value and thus be the path of most resistance. Try to see this on a molecular level because that’s the way energy (heat) flows.
If you go back and read Blog #004 (Jan 10, 2011) you’ll see a brief discussion on the recommended ∆T ( outside surface to inside surface ∆T of the wall being inspected). Sometimes the difference in ambient temperatures (inside to outside) is sufficient. But the influence of the sun and wind can change the outside surface temperature dramatically from the ambient temperature. For example, the outside ambient temperature could be 30°F and the outside wall surface could be 120°F due to solar heat. So, it’s a good idea to be aware of what’s happening on the outside of the wall that you are inspecting. The recommended ∆T (temperature differential surface to surface) is 18°F or greater. This is perhaps due to the nature of the R-value of materials. R-values can be expressed as the temperature difference needed to transfer 1 BTU/hr/ft². For example, R-19 value would require a 19° F temperature difference to transfer 1 BTU/hr/ ft². 1 BTU is not of lot of heat transfer, is it? The effect on the target wall that you are looking at is very small. I was looking at an uninsulated wall with a 73°F inside surface temperature and a 47°F outside surface temperature. That is a 26°F ∆T, well above the 18°F minimum suggested. The area on the wall where the wood framing is located read 74.3°F. The bay read 73°F. That is only a 1.3°F temperature difference. That’s why it’s important to have a “sensitive” infrared camera for this type of work. The lower the ∆T from outside surface to inside surface, the less thermal effect you’ll see on the wall you are inspecting. As mentioned, some infrared cameras are more sensitive than others and will pick up more detail. (Get the most sensitive camera you can afford)
In this blog #060 and the following three blogs I want to give you some exercises containing a variety of scenarios so that you can practice identifying insulation issues. If you think your way through these exercises you’ll raise “your Thermography comfort level”.
(Warm wall cavity areas (lighter color) and wood framing (darker color):
#1 scenario: viewed from the outside during the heating season (winter) – Are the bays insulated?
#2 scenario: viewed from the inside during the heating season (winter) – Are the bays insulated?
 excercise warm bay scenario (Answers:)
Scenario #1 – no insulation
Scenario #2 – Insulated
Look for scenarios # 3 and #4 in blog #061 on Nov 2.
How’s your comfort level in thermography?
(The above comments represent my opinion).
Rod Hoff / Restoration Consultants Inc
Thermography Instructor / IR camera sales
3284 Ramos Circle, Sacramento CA 95827
toll free 888-617-3266 ext 301
fax 916-736-1134
rhoff@restcon.com
Provider of Fluke TiS, TiR, TiR1, Ti, Ti25, TiR27, Ti27, TiR29, Ti29, TiR32, Ti32, TiR3, and TiR4 infrared cameras.
See DEMO www.moistureview.com/demo.html
Posted in building envelope, Fluke, general, infrared cameras, Thermography
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Tagged Fluke infrared camera, Fluke infrared cameras, Fluke IR camera, Fluke Ti27, Fluke Ti29, Fluke Ti32, Fluke TiR, Fluke TiR1
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When shopping for an IR camera one needs to match up certain features of the camera to the investigative needs of the thermographer. So, we need to understand and look at “camera specifications” which are found in the “spec sheets”. The most expensive thing you can do is get a camera that doesn’t fit your needs. For example, is there a difference in the needs of a thermographer who is performing inspections on high ∆T (temperature difference) items (such as motors, electrical, etc) verses the thermographer who is performing inspections on small ∆T surfaces (interior/exterior building surfaces) ? Yes! This is where we become concerned about the “sensitivity” of the detector array in the camera. Performing inspections on surfaces that have a 100 degree F differential does not require the same sensitivity as performing inspections on surfaces that have a 2 degree F differential. For example, evaporative cooling usually results in a drop in temperature of only a few degrees F. The more sensitive the detector array, the easier it will be to locate such issues. When you look at a spec sheet for a particular camera, look for “thermal sensitivity” or the NETD (noise equivalent temperature differential). You’ll usually see something like this: ≤0.1 °C at 30°C target temp. (100mk); or ≤0.07 °C at 30°C target temp. (70mk); or ≤0.05 °C at 30°C target temp. (50mk). The lower the number, the more sensitive the camera. The 50mK infrared camera detector array is much more sensitive than the 100mK detector. You’ll notice, too, that the lower the number the more expensive the camera. I would not recommend a camera that has an NETD higher than 100mK.
The ASNT (American Society of NonDestructive Testing) says: “The noise equivalent temperature difference is also the primary index of the infrared thermographic system. This index indicates the temperature resolution and shows the minimum detectable temperature difference appearing on a target surface whose emissivity ε is nearly equal to 1.0”… “A smaller value indicates better temperature resolution of the system.”
The images below show the capability of highly sensitive infrared cameras and this is what you need to perform a thorough job in building diagnostics.
 Taken with a Fluke 70mK Ir camera Notice that the framework is only .2° F (2/10 of a degree) cooler and the effect of the hot water pipe is less than a 2 degree F rise in temperature.
 Fluke 50mK detector This image was taken with a Fluke Ti32 infrared camera with a 50mK detector array. Notice the detail and the sensitivity. This camera can detect and collect greater detail which helps the thermographer who is performing energy audits home inspections and moisture investigations.
How’s your comfort level in thermography?
(The above comments represent my opinion).
Rod Hoff / Restoration Consultants Inc
Thermography Instructor / IR camera sales
3284 Ramos Circle, Sacramento CA 95827
toll free 888-617-3266 ext 301
fax 916-736-1134
rhoff@restcon.com
Provider of Fluke TiS, TiR, TiR1, Ti, Ti25, TiR27, Ti27, TiR29, Ti29, TiR32, Ti32, TiR3, and TiR4 infrared cameras.
See DEMO www.moistureview.com/demo.html
Posted in building envelope, Fluke, general, infrared cameras, Thermography
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Tagged Fluke infrared camera, Fluke infrared cameras, Fluke IR camera, Fluke Ti27, Fluke Ti29, Fluke Ti32, Fluke TiR1, infrared cameras
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To answer that question we have to ask “Why do people choose to get a home inspection before buying a house?” It’s to reduce the “RISK” factor. The greater the investment, the greater the risk! So, a trained home inspector offers a valuable product, his expertise in performing an examination of the building for possible problems. The time to know about problems is obviously BEFORE the purchase so that problems can be negotiated in the price or fixed. Home inspections are traditionally performed as a visual inspection with all of the limitations that come with visual inspections. For example, can you, with your eyes, detect possible missing insulation? No! Can you, with your eyes, detect possible moisture issues in walls, floors, and ceilings if stains are not present or visible water is not present? No! And the person that hires a home inspector understands the limitations of a visual inspection. That means that the reduction in “risk”, the thing that the customer is paying you for, is limited too. What if you could further reduce your risk using a more in-depth inspection? Does that sound attractive? To many people it is not only attractive, but it is preferred. The images below represent the results of two types of inspections: visual inspection verses infrared inspection. Which inspection would you want BEFORE you purchase this house?
 No sign of a problem
 Now we see a possible problem
 No indication of a problem
 Now we see a problem
One of the advantages in using this Fluke IR Fusion camera is that you can demonstrate the infrared capability verses the visual capability. Present the images like I did above and let the customer see the value of infrared.
How’s your comfort level in thermography?
(The above comments represent my opinion).
Rod Hoff / Restoration Consultants Inc
Thermography Instructor / IR camera sales
3284 Ramos Circle, Sacramento CA 95827
toll free 888-617-3266 ext 301
fax 916-736-1134
rhoff@restcon.com
Provider of Fluke TiS, TiR, TiR1, Ti, Ti25, TiR27, Ti27, TiR29, Ti29, TiR32, Ti32, TiR3, and TiR4 infrared cameras.
See DEMO www.moistureview.com/demo.html
Posted in building envelope, Fluke, general, infrared cameras, Thermography
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Tagged Fluke infrared camera, Fluke infrared cameras, Fluke IR camera, Fluke Ti27, Fluke Ti29, Fluke Ti32, Fluke TiR, Fluke TiR1, infrared camera
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