Scale reading value with engineering limit for historical trend

I am reading two value from the Modbus device, whenever the pH device is calibrating the trend show 327
I was scaling the value in the device 0-14, but when they shut down or calibrate the device it’s how 327
I scale value in engineering unit low 0, and high 14 and engineering limit enforcement enable for both
but still reading high or negative
do you have any idea
do you think I have to write the script for the tag event

Engineering limit enforcement applies only to writes, if I recall correctly. Consider using a derived tag to yield a clamped value.

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Clamped both 0 to 14 and will let you know the result