Initial tuning report of the machine.
The loop performance 26 minutes later.
To have optimum performance of the heat treat equipment requires a good PID control and a control system that is capable of controlling the heat in all the temperature ranges. Bogh Industries has been able to develop strategies that have proven extremely accurate. We start by a review of the airflow and existing data from the equipment. Equipment inspections are also performed to ensure the oven/furnace is in a condition that tuning will be effective. After this is completed we recommend strategies to improve the controls.
Things that might affect performance:
- Type of TC and location.
- Airflow and stratification in the supply ducts
- Type and resolution of control motors
- Turndown and response on heaters/burners
- Type of control valves
- Load configuration
- General oven/furnace condition
Tuning of most PID’s are done with modern software and a full report is submitted after the tuning is completed.
Furnaces with +/-5F in the zone is our standard and +/-2F has been archived in several large direct and indirect fired new and older systems.
The graph shows an 18 point survey of a solution heat treat furnace. Uniformity +2°F to -3°F at 850°F
This graph shows a temperature and control upset during a furnace door opening. This is used to check the PID performance.
Various tuning methods may use programs such as ExperTune® to display information gathered from the machine. While ExperTune is used in some of these procedures, it is not the only program/process Bogh Industries utilizes.