ADS Environmental Services FlowShark Pulse QR 775004 A1 - Manual (Page 44)

5-4 ADS FlowShark Pulse O&M Manual
To identify the zero point for the pressure measurement cell, consider
measuring the current depth level with a yardstick, ruler, or similar
tool without removing the sensor from the flow. However, keep in
mind that this method can produce errors. Inserting the ruler (or
yardstick) into the flow creates a surge that could lead to
measurement errors based on the current flow velocity. When this a
concern, another method for determining flow depth involves
measuring the distance from the top of the pipe to the flow surface
(commonly referred to as “range”) and subtracting this distance
from the pipe diameter.
Remove combi sensors with the pressure measurement cell (Type 3K
and 4K) if the pressure depth measurement component fails. Rinse
this sensor with clean water for a sufficient amount of time and then
carefully rinse the pressure duct or clean it with a soft brush.
Do not use high pressure water to flush the duct. This could damage
or destroy the built-in pressure sensor.
In addition, never remove the ground plate. This could increase the
potential for leakage or permanent damage to the sensor.