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Short presentation on Pyrometry
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Pyrometry
Bob Faticanti
Sr. Manager Supplier Development Eng. /
Textron Defense Systems
Chemical Processing
October 21, 2012
Objectives of Training
1. Improve Understanding of Pyrometry
Basics
2. Improve Understanding of AC7108
sections 5.4 and 5.5
3. Communicate AMS 2750 Rev. E
4. Answer any questions
IMPROVE UNDERSTANDING OF PYROMETRY BASICS
Objective #1
AC7108 section 5.4 • Only required to verify the questions in this
section.
• However, AMS 2750 is considered the
baseline requirement
• Customers may have higher requirements
High Level
• Does it look like they know what they are doing?
• Check the procedure, SAT and TUS reports
• Considerations – Does the Supplier also do Heat Treating?
• Are they Nadcap accredited for Heat Treating?
• Are their HT pyrometry systems also over the CP Thermal Processes?
– Does the Supplier do the pyrometry themselves?
– Does the Supplier outsource pyrometry?
Procedures
– Even if Outsourced • Replacement of control sensors (typically annually per 3.4.3.4)
• SAT procedure
– Frequency
– Correction factors
• TUS procedure
– Define Work Zone → Size affects # of sensors and locations → Corners of TUS
sensors = Boundary of where product can be placed → Needs communicated to
shop
– Survey temperatures and qualified operating range
• Quality needs to review
– Any maintenance that could affect SAT
– Any furnace modifications (defined 3.5.3) that could affect TUS
– Address any out of tolerance needs evaluated per material review procedures
• Quality needs to review and approve Instrument Calibration, SAT Report, and
TUS Reports
AMS 2750 Rev D
AMS 2750 Rev D
Let’s Start with
Thermocouples,
Controllers and Recording
Instrumentation
Thermocouples (T/C)
• Sensors have errors. This needs accounted for or the SAT/TUS data is wrong
• Does the Certificate of Compliance for the T/C State the Correction Factor or Deviation? – NOTE: They need to reverse the sign if it lists a “Deviation”
• Average Front to Back of the wire at a given temperature
• Always add the Correction Factor algebraically – e.g. on the following example. If the Temperature measured shows 1510F
then the true value is 1510 + (-1.5) = 1508.5F.
T/C Correction Factor Cont.
• Was the T/C Correction Factor Determined
correctly?
– Do Not Extrapolate Beyond Calibration Range
– One can use various methods but be consistent
• Use the closest value
• Use correction factor that is the highest
• Use the correction factor that is the lowest
• Linearly Interpolate between Temperatures
Other items on Site
• Check if the Supplier has the items
required to be on site per 3.5.21.2
Tested within oper. range
System Accuracy Testing
System Accuracy Test – tests the accuracy of the control T/C
What does the SAT need?
Weekly System Accuracy Test (S.A.T.) Results
Week: 3/11-3/17 Year: 2012
Test Instrument Test Sensor
Identification/Information Controller Test
Sensor Disposition
Furnace Initials Date Time Handheld ID# S/N
Due Date for
Handheld Calibration
E Handheld Correction
Factor
Type (Probe or T/C) S/N or ID
Calibration Cert./Spool
#
D Correction
Factor
Due Date for Probe
Calibration Temp.
Setpoint Offset
A Temp Actual
B Temp As
Read
C (B+D+E) Temp.
Corrected
F SAT
Difference (C-A)
Accept / Reject
Quality Initials
A Z1 VD 3/14/12 4:17 AM 09-170 5/9/12 -1 P 15222 15222 0.65 5/13/2012 980 0 980 976.6 976.25 -3.75
A Z2 VD 3/14/12 4:17 AM 09-170 5/9/12 -1 P 15219 15219 0.35 5/13/2012 980 0 980 977.1 976.45 -3.55
B Sol VD 3/13/12 2:34 PM 09-170 5/9/12 -1 P 15226 15226 1.08 5/6/2012 1000 0 1000 998.1 998.18 -1.82
C Sol VD 3/15/12 12:36 PM 09-170 5/9/12 -1 P 15176 15176 2.5 4/30/2012 1000 0 1000 1000.1 1001.6 1.6
D Sol 09-170 P 0 0
E Sol VD 3/14/12 11:04 AM 09-170 5/9/12 -1 P 15233 15233 1.25 4/28/2012 980 0 980 975.6 975.85 -4.15
0 0
A age VD 3/14/12 8:19 AM 09-170 5/9/12 -0.8 P 15227 15227 0.2 4/30/2012 370 5 365 365.6 365 0
B age VD 3/15/12 11:00 AM 09-170 5/9/12 -0.9 P 15218 15218 -0.1 4/30/2012 475 -5 480 474.4 473.4 -6.6
C age DOWN 09-170 P 0 0
D age VD 3/15/12 4:30 AM 09-170 5/9/12 -0.8 P 15210 15210 2.01 4/17/2012 370 -5 375 373 374.21 -0.79
Temperature Uniformity Survey
Temperature Uniformity Survey tests the variation in temperature within a defined space.
Example TUS rack:
WORK ZONE
AMS 2750 Rev D
390 Cubic Ft. Furnace
What Does TUS Report need?
Accepted and signed by QC.
TUS Checklist
• Does the TUS show high & low T/C results
• Did the TUS run for 30 minutes after all T/C’s are stabilized? Does it show data before they are stabilized?
• Was the correct number of T/C’s used? (see table 11 for required #)
• Is there a diagram of the locations? (see 3.5.13.2 for required locations)
• Did they use a rack? If so is the load condition maintained per 3.5.10
• What is the operating range of the oven/furnace? Are the high and low surveyed at least once per year?
• Each Oven/Furnace must be identified with the operating Temperature Range: ex. 350 – 1000 F
Passing SAT/TUS • Checklist requires Class 5 unless more stringent
is specified by the customer.
• Specified by customer by detailing a temperature range, e.g. 550 +/- 15 makes it class 3. See 3.3.1 Figure A.
• SAT – To pass = +/-5 F unless more stringent class is
specified by the customer
• TUS – To pass = +/-25F from set point unless more stringent
is specified by customer.
AMS 2750 D Para 3.3.1
Figure A • Furnace Class - Temperature Uniformity Range (Degrees F) - Temperature Uniformity Range (Degrees C)
1 +/- 5 F +/-3 C
2 +/- 10 F +/-6 C
3 +/- 15 F +/-8 C
4 +/- 20 F +/- 10 C
5 +/- 25 F +/- 14 C
6 +/- 50 F +/- 28 C
Failing a TUS/SAT
• Did the TUS/SAT report state fail?
• Did any fail but not state fail?
• Did the Supplier take action? e.g. MRB for
all product since last good test
• If the external report stated failed was the
supplier notified by the pyrometry vendor?
IMPROVE UNDERSTANDING OF AC7108 SECTIONS 5.4 AND 5.5
Objective #2
5.5 Misc. equipment below 250F or
otherwise not controlled by 5.4 • The key point is to avoid overheating parts which could be damaging or to
ensure any customer requirements are met.
• 5.5.1 – Are there controllers? Are they calibrated? Check records, check
calibration recall system, check sticker on the controllers
• 5.5.2 – This is basically asking for a TUS light. They may not be following all of
pyrometry rules but need to define the space for the product and testing sensors. Are there procedures? Is a frequency defined? Are max temperatures checked? Are min temps checked if applicable? Is the work zone defined? Is it defined how test is done?
TBD
• Once AC7108 Rev F is finalized, it needs
to be reviewed to determine what, if any
changes need to be emphasized to CP
auditors.
AMS 2750 Rev E • AMS 2750D went into effect in 2005
– Substantial overhaul of Rev. C
• Rev E went into effect – July, 2012 ~50 editorial changes or changes to clarify rather than alter the technical requirements.
~25 changes noted as changes to technical requirements
• Provide a handout summarizing changes. – Highlight those applicable to CP.
TBD • Now that AMS 2750 Rev E is finalized, it
needs to be reviewed to determine what, if
any changes need to be communicated to
CP auditors to look for.
• Examples: Are Suppliers aware revision
has changed? Do they have a copy of it?
Are TUS/SAT reports from a vendor to the
latest revision?
Questions