Willliamson Multi-Wavelength MWx-AS Pyrometers for Aluminum Hot Rolling Mils

Multi-wavelength pyrometers are used to measure the temperature of non-greybody materials. These are materials for which the emissivity not only varies, but varies differently at different wavelengths.

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Description

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Traditional multi-wavelength pyrometers use static, application-specific algorithms to compensate for complex emissivity characteristics. The MW pyrometers assume that the surface conditions for these applications are relatively consistent.

The Williamson MWx pyrometer uses Dynamic ESP Technology to compensate for more significant variation in surface character and conditions without adjustments. For example, at the aluminum hot rolling mill, the surface character of the aluminum varies dramatically as it goes through the reversing mill, so the traditional MW technology is not appropriate.

Temperature Limits:
575 to 1100°F / 300 to 600°C 
Spectral Response
:
Range of precisely selected narrow wavelength bands
Optical Resolution:

D/25, D17
Accuracy: 
 0.5% of reading or 2°C whichever is greater
Repeatability:
Better than 1°C
E-Slope:

0.000 to 2.000

Reversing Mill Accuracy

With its Dynamic ESP Technology, no adjustments to the MWx were required to achieve the following results. These results are obtained using the Reversing Mill algorithm and using the same default parameter settings across all alloys and for all passes. Results for 1000, 4000 and 8000 series alloys are pending.

Aluminum Hot Rolling Mill
On-Line Results
Middle Pass
(Typically Pass 5 -11)
Final Pass
(Typically Pass 12 -18)
Alloy Average
Variance
Standard
Deviation
Average
Variance
Standard
Deviation
2000 -1˚C 4.4˚C -2˚C 1.7˚C
3000 4˚C 3.9˚C 2˚C 3.4˚C
5000 2˚C 3.2˚C 2˚C 2.1˚C
6000 -2˚C 4.7˚C -4˚C 4.3˚C
7000 1˚C 2.9˚C -1˚C 3.0˚C

 

A –
Model
B –
Wavelength
C – Temp
Code
Temp
Scale
D-Field
of View
E-Sensor
Output
F –
Options
G –
Accessories
H –
Cable
MWx AS 11 F- or C- 10ft/25- or 3M/25 A- or D- VALA IM-SB-PCJ-AP CF040 or CM012

 

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