# Applying Correction Factors to Furnaces

N

#### Nmark78

Hello Everyone:

I am slightly new to the quality world and would like to ask for some help in interpreting the application of correction factors. For basic example, if my TC cert stated the following

Test temp---- Actual temp----- correction factor
1000 F ---------1005 F...................( -5 F)

If I wanted to run a furnace a true temperature of 1000°F I would need to set my furnace for 995°F correct? (assuming the TC in question is the only sensor with a correction factor) My theory behind this is that although my TC says its running at 1000°F it is actually running the furnace at 1005°F so I would need to add my correction factor (-5°F) to my set point (now 995°F)to obtain a true temperature of 1000°F. Am I on the right path?

I am having difficulties finding any examples to support this or any other methods for applying correction factors. Is anyone aware of any resources for this topic with examples?
Thanks for any help or advice you can provide.

S

#### ssz102

why test temp and actually temp are different?

did you analysis the root cause? is environment or machine or other factor?

illation may not be correct i think

S

#### Sorin

Hello Everyone:

I am slightly new to the quality world and would like to ask for some help in interpreting the application of correction factors. For basic example, if my TC cert stated the following

Test temp---- Actual temp----- correction factor
1000 F ---------1005 F...................( -5 F)

If I wanted to run a furnace a true temperature of 1000°F I would need to set my furnace for 995°F correct? (assuming the TC in question is the only sensor with a correction factor) My theory behind this is that although my TC says its running at 1000°F it is actually running the furnace at 1005°F so I would need to add my correction factor (-5°F) to my set point (now 995°F)to obtain a true temperature of 1000°F. Am I on the right path?

I am having difficulties finding any examples to support this or any other methods for applying correction factors. Is anyone aware of any resources for this topic with examples?
Thanks for any help or advice you can provide.
In order to avoid mistakes, you need to correct not your set point but the instrument showing the temperature from your thermocouple.
In your case the thermocouple have a correction factor of -5 F. So you need to set your instrument at -5 for that range of temperature.
Also, you need to document the change (log).

Another possibility would be for your operator to set the correction factor avery single time they are performing an HT at that range of temperature.

Either way, you need to log and document.

P.S. My reply is from a AMS2750 / Nadcap point of view.

AC7102 rev F
10.8.6 Offsetting
Note: Offsetting may be applied either by internal electronic adjustment or by manual offset of the set point as long as the method is clearly documented and followed, and complies with the specific customer requirements.

10.8.6.1 Is there a procedure that specifies the use of offsets?

10.8.6.2 Is the procedure in accordance with AMS 2750, or more stringent customer requirements?

10.8.6.3 Do records indicate that the procedure is followed?

10.8.6.4 Are manual offset tables clearly posted and visible to the operator?

10.8.6.5 Are electronic offsets documented and available to calibration technicians?

10.8.6.6 Does documentation exist to verify that the offsets were applied?

A

#### andygr

Hello Everyone:

I am slightly new to the quality world and would like to ask for some help in interpreting the application of correction factors. For basic example, if my TC cert stated the following

Test temp---- Actual temp----- correction factor
1000 F ---------1005 F...................( -5 F)

If I wanted to run a furnace a true temperature of 1000°F I would need to set my furnace for 995°F correct? (assuming the TC in question is the only sensor with a correction factor) My theory behind this is that although my TC says its running at 1000°F it is actually running the furnace at 1005°F so I would need to add my correction factor (-5°F) to my set point (now 995°F)to obtain a true temperature of 1000°F. Am I on the right path?

I am having difficulties finding any examples to support this or any other methods for applying correction factors. Is anyone aware of any resources for this topic with examples?
Thanks for any help or advice you can provide.
As indicated by Sorin AMS 2750 is the "bible" for Nadcap pyrometry. here is a link to good training class on pyrometry http://www.equalearn.com/learncente...48B-8392-3E93785CE9E8&DCT=1&id=178409&page=15

By using the 995 deg F set point you are using a manual correction factor to ensure that you acceive the required 1000 deg F temperature in reality based on the System Accuracy Test (SAT) data you provided.

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