ADS Environmental Services Portable FlowShark Pulse QR 775006 A2 - Manual (Page 51)

3-14 ADS Portable FlowShark Pulse Manual
Installing a sensor with the integrated water-ultrasonic measurement capability
Water-Ultrasonic Velocity/Combination Sensors with Integrated Pressure
Measurement Cell
To compensate for atmospheric pressure, sensors with integrated pressure
measurement cells have an air hose located inside the cable. Do not buckle or seal
this air hose or clamp the hose into hermetically sealed connection sockets without air
pressure compensation. The pressure cell cannot measure flow depth accurately
under these conditions.
Operating sensors with an integrated pressure measurement cell
with a filter element that is no longer able to absorb moisture may
lead to irreversible damage to the sensor electronics.
Due to the physical design and installation of the sensor,
measurement errors may occur when using a combination sensor
with a pressure measurement cell under high velocity/low flow
depth conditions.
Never touch the pressure element with fingers, brushes, tools,
water jets, or similar items! Otherwise, the pressure element might
be damaged, resulting in measurement failures.
Never remove the cover of the pressure measurement cell during
installation! This cover protects the cell from damage by an
external source.
When silt or sedimentation is present, consider installing sensors with an integrated
pressure measurement cell off-center. The pressure measurement cell can still detect
the depth level above the sensor when installed up the side of the pipe. However, be
sure to enter the resulting offset into the transmitter in the sensor installation level
parameter section.