Proof
Pressure - The maximum pressure that can be applied to the bourdon tube without rupturing the bourdon tube or causing leakage in a transmitter (repair or calibration will not be required)
Burst Pressure - The maximum pressure that can be applied to the bourdon tube before the bourdon tube or movement rupture, warp or deform (instrument will require repair or recalibration once BP is reached)
rupturing
required
will
causing
leakage
without
rupturing
transmitter