scratchedup
Well-known member
Just bought this...for $25 its a game changer...it is very cool.
HF IR sensor
- Thread starter scratchedup
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O_M_Jeep
Banned
Ice is always 32 degrees, if you want to check accuracy, when calibrating pulp and stick thermometers we always used ice-water, always 32 deg.
Shadowdog500
Well-known member
I've had one for about 5 years and it works fine.
Chris
Chris
JASTECH
Well-known member
Ice can be colder then 32°F depending on what temp it's froze down to and the particles in the ice. Pure water does not freeze, once impurities are allowed in, this "dirty" water will now freeze.
Thanks, JASTECH & Son
Thanks, JASTECH & Son
Shadowdog500
Well-known member
Pure water (with no contaminants) turns to ice around -40.
O_M_Jeep
Banned
~~~rolls eyes~~~ the point is, when calibrating a pulp thermometer, ice water is 32 degrees. If you really want to be pedantic we can be, and we can discuss isothermal variables in the container causing differences in temperatures too, or perhaps the ice was made in a non-calibrated freezer in the southern hemishpere, and of course the ice in space ie; comets and extraplanetary bodies are different still. So, how do you think all that applies to the f**king HF IR thermometer?
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Maexle
Well-known member
I've been told and noticed that the color or reflectivity (I think I just made that word up) can affect the reading. So if you check something that is shiny silver, white, black, etc., that can make a difference in the reading.
Joe Mamma
Joe Mamma
Don't forget changes in atmospheric pressure due to elevation.
But seriously, one of the more accurate ways would be to take an ice cube and set it outside of the freezer. Then measure the surface of the cube after it starts to melt. The ice/water mixture will be close to 32*F. This assumes the ice is reasonably pure.
But seriously, one of the more accurate ways would be to take an ice cube and set it outside of the freezer. Then measure the surface of the cube after it starts to melt. The ice/water mixture will be close to 32*F. This assumes the ice is reasonably pure.
Whoever told you that is having a tremendous laugh at your expense.
Not quite. At standard atmospheric pressure, icewater is always 32 degrees. ice can be colder than 32, and water can be warmer than 32, but icewater will not warm up or cool down from 32 until it is first all frozen, or all thawed.
Introduction of soluble substances (e.g. salt) in the water can change this.
steel 35
Well-known member
Stainless and copper are fine examples don't trust them.
O_M_Jeep
Banned
can someone give me an example of using this tool to work on a car where +/- 5 or 10 degrees makes any difference what-so-ever ??
That is correct. A thermodynamics textbook will have a table in it that charts freezing and boiling points relative to pressure. Google would probably turn something up as well.
5° or 10°? No, I can't think of anywhere on an engine that that would make a big difference. 30 or 40...maybe
AZ_Catskinner
Well-known member
I've got both this one and a Fluke - the difference in readings between the two is negligible. The HF does have a wider cone angle, so it doesn't have quite the pinpointing ability.
OP
scratchedup
Well-known member
I also cook a lot and just bought an induction burner. It is really helpful here also.
When checking the inlet and outlet temps on a heater core it could matter.
It's been my experience with these, if they are off, they are usually off consistently.
I.E. Your inlet and outlet temperatures, if inaccurate, will be off by the same amount, so if you are calculating difference between the two, it probably doesn't matter.
I.E. Your inlet and outlet temperatures, if inaccurate, will be off by the same amount, so if you are calculating difference between the two, it probably doesn't matter.
I also cook a lot and just bought an induction burner. It is really helpful here also.
You are making me hungry. What is the vise for?
Emissivity:
http://www.raytek.com/Raytek/en-r0/IREducation/Emissivity.htm
Ice water is commonly used to calibrate instruments in industry. For an infrared gun without emissivity adjustment, and lacking a NIST traceable black body emitter, target your wrist, close enough.
If you're concerned about the surface finish, spray it with flat black paint.
reflectivity is a word already used by engineers on a daily basis. What you are talking about is emissivity: the relative ability of a material to emit infra red radiation. It is the ratio of energy radiated by a particular material to energy radiated by a black body at the same temperature. An ideal black body has an emissivity of 1, the more reflctive a material is the lower its emissivity, the duller and blacker it is the higher emissivity.
Reflectivity is the fraction of incident electromagnetic power that is reflected at an interface. A surface has both emissivity and reflectivity but an IR Thermometer reading is responding to the amount of intr red radiation leaving the surface so emissivity is what you are interested in. Hope that helps.
Hammer1963
Well-known member
I use mine for plastic repair on bumper covers etc, welding / brazing and Aluminum repair
OP
scratchedup
Well-known member
Vise.....well this is The Garage Journal not The Cooking Journal so...
The vice is on a red table for my shop and it has been very useful...something kinda cool I built as a quickie winter project. It is high, light and is on locking casters.
I have the pocket one too. I use it for reading the temp of nitrous bottles.
I got one as a gift for Father's day. I use it to check temps on a griddle for outdoor cooking. Helps to know how hot the griddle is before putting the food on. Outdoor temperature, wind conditions, cloudiness and so forth can affect the surface temps by quite a bit, so it's pretty handy. I've had it since June, works great!
crewchief888
Well-known member
i've had hyd temp on const eq running right on the edge of overheating, and going into shutdown.
the 10* difference between the temp gun/ sender was reading, and what the computer was reading made the difference.
just repairing some f'd up wiring (multiple wirig repairs withona 6 inches of the sensor, changed the feedback voltage to the computer) brought the temp the computer was reading down to what the sensor was reading.
another field tech has the hf model, we compared it to my raytec. they were within 2 or 3 degrees,
but his had to be closer to the sensor to read a "correct" temp due to the cone angle on of lazer.
on that particular job, the HF model wouldnt have been able to get close enough to pinpoint a spot on the sensor, due to the muffler @ 400* and a wiring harness in the way.
