Temperature Uniformity Surveys & Heat Treat Calibration Services
Temperature Uniformity Surveys & System Accuracy Tests
Heat treat operations require specialized calibration beyond standard temperature calibration, addressing the unique demands of furnace systems used in aerospace, the automotive industry, and industrial manufacturing.
Cal Tec Process Management can help you meet the requirements of AMS 2750 and AIAG CQI-9 by providing both Temperature Uniformity Surveys (TUS) and System Accuracy Tests (SAT). We offer Accredited Temperature Uniformity Survey Services to AMS 2750 and Standard (commercial) Temperature Uniformity Survey Services for other protocols. We will even assist with creating a custom protocol, if needed.
Our environmental and temperature uniformity solutions help to identify quality issues as well as ensure process requirements.
SAE AMS 2750E Aerospace Material Specification
AIAG CQI-9 Heat Treat System Assessment
We provide these services for many types of equipment, including:
- Autoclaves
- Environmental Chambers
- Environmentally Controlled Manufacturing and Critical Storage areas
- Freezers and Refrigerators
- Furnaces and Ovens
- Temperature Chambers
Don't see what you need? Contact us for a custom quote.
Our Heat Treat Calibration Specializations
Our experts specialize in the following types of calibrations:
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Temperature Uniformity Surveys (TUS)
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System Accuracy Tests (SAT)
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Temperature Controller Calibration
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Control TC Calibration
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Temperature Recorder Calibration
Temperature Uniformity Surveys and Calibration
A TUS and temperature calibration are related, but they serve different purposes.
Temperature calibration compares the measurement from a specific instrument or sensor against a known reference to determine its measurement accuracy.
A Temperature Uniformity Survey evaluates how temperature is distributed throughout a chamber or other defined work area.
In many applications, both may be important. Calibrated sensors provide confidence in the temperature measurements collected during a TUS, while the survey itself helps evaluate the temperature performance of the equipment as a whole.
What is the Purpose of a Temperature Uniformity Survey?
A Temperature Uniformity Survey evaluates how evenly temperature is distributed throughout the work area of temperature-controlled equipment. By using multiple calibrated temperature sensors, a TUS can identify temperature variations, including potential hot and cold spots, and provide documented information about the equipment's temperature performance.
How Does a Temperature Uniformity Survey Work?
During a TUS, multiple calibrated temperature sensors are positioned at predetermined locations throughout the equipment's usable work area. The sensors are connected to a data acquisition system that records temperature measurements over a specified period.
The equipment is then operated at the temperature or temperatures being evaluated. As the survey progresses, temperature readings from each sensor are collected and analyzed to determine how temperature varies throughout the work zone.
The exact number and placement of sensors, survey duration, temperature setpoints, and acceptance criteria can vary depending on the equipment, application, and applicable requirements.
Once the survey is complete, the recorded data can be reviewed to evaluate temperature uniformity and determine whether the equipment meets the specified acceptance criteria.
What Happens After a TUS?
After the survey is completed, the collected temperature data is analyzed and documented. The results can be compared with the applicable acceptance criteria to determine whether the equipment's temperature uniformity meets the specified requirements.
If temperature variations are identified, the results can help point to areas that may require further investigation, adjustment, or corrective action.
Documentation from the survey can also provide a record of the equipment's temperature performance for quality and process-control purposes.
Frequently Asked Questions
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What is a Temperature Uniformity Survey?
A Temperature Uniformity Survey (TUS) is a test used to evaluate how evenly temperature is distributed throughout a temperature-controlled chamber, oven, furnace, or other thermal processing equipment.
While a temperature display or controller may indicate that equipment has reached a specific temperature, that reading represents the temperature at a particular location. It does not necessarily tell you whether the entire work area is maintaining that temperature consistently.
A TUS uses multiple temperature sensors placed throughout the equipment's work zone to measure and document temperature variations. The results help identify hot spots, cold spots, and areas where temperature may vary beyond acceptable limits. -
How often should a Temperature Uniformity Survey be performed?
The appropriate frequency for TUS testing depends on the equipment, application, quality requirements, and applicable procedures or standards.
A survey may be appropriate when:
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New temperature-controlled equipment is placed into service
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Equipment has been relocated or significantly modified
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Maintenance or repairs may have affected temperature performance
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Temperature performance needs to be verified
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A required testing interval has been reached
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Process or quality requirements call for documented temperature uniformity testing
Your organization's procedures and applicable requirements should be used to determine the appropriate testing frequency and acceptance criteria.
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What does a TUS measure?
A Temperature Uniformity Survey focuses on the distribution of temperature throughout a defined area rather than simply measuring temperature at a single point.
Depending on the application, the survey may provide information about:
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Temperature variation from one location to another
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Temperature stability over time
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The difference between the highest and lowest recorded temperatures
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Areas that consistently run hotter or colder than others
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Temperature performance at different locations within the work zone
This information provides a more complete picture of how temperature-controlled equipment performs during operation.
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What types of equipment can undergo a Temperature Uniformity Survey?
Temperature Uniformity Surveys can be performed on a variety of temperature-controlled equipment, including ovens, furnaces, environmental chambers, incubators, refrigerators, freezers, and other equipment where consistent temperature distribution is important. The appropriate survey method depends on the equipment and its intended application.
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What happens if a Temperature Uniformity Survey identifies temperature variations?
Temperature variations identified during a TUS can help pinpoint areas of the equipment that may require further investigation, adjustment, maintenance, or corrective action. The survey results can be compared with the applicable acceptance criteria to determine whether the equipment meets the specified temperature uniformity requirements.
Request a Quote for a Temperature Uniformity Survey
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ISO/IEC 17025 accredited calibration lab
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Affordable calibration services with fast turnaround and results you can rely on
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Expert technicians and responsive customer support
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Serving the greater Midwest region for more than 30 years