We had calibrate existing temperature sensor on customer site. Calibration will be done after removing from equipment . We will bring standard sensor and heating furnace and loggers and check it. In case of high calibration temp , we need enough time for increasing temperature of furnace.
In case of R.T.D. , we have reason of on site calibration because it’s life time is long. However you shall buy new element when you need calibrate K,E,T and J Type Thermocouples.