Self-Calibrating Furnace does not require calibration

Crusader

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#1
Ran into an oddball situation the other day. We have brand spanking new Jet Melter Aluminum Furnaces. Apparently, these furnaces are internally self-calibrating according to their specs.

This is their website:
http://www.moderneq.com/aluminum_melting.html

Do we get calibrated just to be safe? Opinions..... please! :thanks:

Edit:
we currently have a calibrated pyrometer to check the furnace readings on the exterior furnace gages.
 
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bobdoering

Stop X-bar/R Madness!!
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#2
Re: Self-Calibrating Furnace does not require calibration - Hmmmmm

I am not sure if they mean capable of self-tuning their PID curves, or true calibration. If they have true self-calibration, then they must have a traceable standard incorporated into the oven. You might want to ask: what it is, where is it, and what is it calibrating? :cool:
 

Crusader

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#3
Re: Self-Calibrating Furnace does not require calibration - Hmmmmm

I am not sure if they mean capable of self-tuning their PID curves, or true calibration. If they have true self-calibration, then they must have a traceable standard incorporated into the oven. You might want to ask: what it is, where is it, and what is it calibrating? :cool:
Yeah, they do. NIST traceable. I believe it is calibrating the internal thermocouple device-gizmo...whatever.
 

BradM

Staff member
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#4
Re: Self-Calibrating Furnace does not require calibration - Hmmmmm

Kind of a long the lines of what Bob was alluding to, many instruments will have some level of internal calibration. Many analytical balances have them, with internal weights for verification.

However, unless there is an unbroken chain to N.I.S.T. (or equivalent) and an uncertainty, then it technically is not a calibration.

If it were my furnace, I would have someone come in and calibrate them. Now, due to this internal calibration feature the instruments may be highly stable, and the "external" calibration option can have longer intervals. But I still would want calibration done with adequate standards and reported measurement uncertainty.:2cents:
 
#5
Re: Self-Calibrating Furnace does not require calibration - Hmmmmm

In most cases 'self calibrating' is an oxymoron, right up there with 'Government Initiative', 'Military Intelligence', 'British Cuisine' etc.:lmao:

Many OE's use the term in their marketing blurb to sell you on some functionality which may be a 'health check' but is certainly NOT calibration.

However, Crusader, since it's possible that your new bells and whistles furnace (part of that phenominal investment we saw on Speed TV?), might do just that.

I'd want someone technical from their company to explain that, in person, so you can watch their eyes.......better yet, get a lie detector and hook them up!
 

Crusader

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#6
Re: Self-Calibrating Furnace does not require calibration - Hmmmmm

Here is the spec from the manufacturer...who stated:
We do have the autocalibration selected on these modules (in the furnace). Please see attached PDF file (Pages 16 through 20) for information on module spec's and calibration information.

I just found out that the furnaces were checked and calibrated by an outside source today. The registrar triennial audit is next week! Nuthin' like last minute huh? :lol:
 

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Al Rosen

Staff member
Super Moderator
#7
Re: Self-Calibrating Furnace does not require calibration - Hmmmmm

How do you know the internal standard is still within tolerance. Calibrate the furnace.
 

bobdoering

Stop X-bar/R Madness!!
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#8
Re: Self-Calibrating Furnace does not require calibration - Hmmmmm

When it comes to furnaces and ovens, it is always good to do an assay on a frequent basis to make sure the temperature variation is acceptable.

Things happen.... :cool:
 

Caster

An Early Cover
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#9
Re: Self-Calibrating Furnace does not require calibration - Hmmmmm

Jet Melter Aluminum Furnaces.
Lot's of controversy in the furnace builder world over this design.

How is it working for you wrt BTU to melt, dross losses?

Caster
 
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