Which statement correctly relates Zero Suppression and Zero Elevation in transmitter mounting?

• A. Zero Elevation occurs below the bottom; Zero Suppression occurs above the bottom.
• B. Zero Suppression occurs above the bottom; Zero Elevation occurs below the bottom.
• C. Zero Suppression occurs below the bottom; Zero Elevation occurs above the bottom.
• D. They refer to mounting for the sensor type.

Answer: (C)

In transmitter mounting for level sensing, the zero reference is defined relative to the bottom plane of the vessel or mounting surface. Zero suppression means the zero point is effectively pushed below that bottom plane, while zero elevation means the zero point is raised above the bottom plane. So the correct relationship is that zero suppression occurs below the bottom and zero elevation occurs above the bottom. This matters because where the zero reference sits changes how the transmitter interprets distance to the surface and how the measured level is calibrated. The other ideas don’t fit because these terms describe the vertical positioning of the zero reference, not the sensor type.