How often is the System Accuracy Test required?

In pyrometry, a System Accuracy Test is an on-site comparison of the furnace temperature vs a separate test thermocouple/instrument to assure the accuracy of the control and recording systems.

It is very important to track the results from these tests since the information changes over time. When conducted properly, this simple test helps the heat treaters to take preventive actions and maintain a reliable temperature system.

The following infographic shows a brief guide for SATs performed on equipment where parts are heat treated according to the aerospace specification AMS2750

Victor Zacarias

Heat treat management expertise: CQI-9, AMS2750

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What’s important in Heat Treatment Instrumentation?

Any temperature system is composed of a sensor (in heat treat, commonly a thermocouple) and an instrument. Having a properly calibrated sensor is just the beginning of the road to an accurate and consistent measuring system so, lets talk this time about the instrumentation. You may like: How to choose temperature sensors in Heat Treatment

The instruments receive electrical communication from the thermocouples and convert the electromotive force (emf) produced by the sensors into temperature values that can be used in the controlling, monitoring and recording of the process parameters.

In heat treatment, we usually have three categories of instruments:

  1. Standard instruments
  2. Test instruments
  3. Furnace instruments

Each category has a specific purpose and the requirements are normally defined by the process specification. AMS2750 and CQI-9 for example, clearly define the usage and precision of the instrumentation used in thermal processing. On the following infrographic you can find useful recommendations about temperature instrumentation and the most common calibration requirements

Victor Zacarias

Heat treat management expertise: CQI-9, AMS2750

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