How should I evaluate oil-temperature drift after continuous operation of a commercial frying machine?

After continuous operation, compare setpoint and measured temperature while separating sensor error, control lag, and insufficient heating capacity. For multi-product use, test representative low, medium, and high operating points to reveal the available adjustment range. If several specifications are required, document each setting so future operators can reproduce the approved process. Do not accept an unspecified “maximum capacity” claim when the real application requires a defined quality level. This information also helps the buyer estimate utilities, staffing, spare parts, and expected maintenance requirements before installation.