ADS Environmental Services FlowShark Pulse QR 775004 A1 - Manual (Page 157)

Parameter Settings 8-67
Calibration and Calculation Menu (CAL)
CAL Menu: Level
This menu allows the user to calibrate depth sensors against actual field
measurements by automatically modifying sensor mounting heights, adapt analog
outputs to the corresponding systems, and emulate relay switching events and analog
outputs. An option to enable and/or modify the automatic velocity calculation
function (when depth falls below the minimum depth required for velocity
measurement) also is available.
Figure 8-112 Menu selection
When using a combi sensor with the pressure measurement cell to measure depth, the
pressure measurement cell, based on its design, may experience zero point drift over
an extended period of time (refer to Chapter 3, Overview and Specifications).
Therefore, calibrate the pressure sensor to the zero point on a regular basis. ADS
recommends calibrating the sensor every 6 months. Analyze measurements taken
with the sensor out of the flow or in as shallow flow as possible.
Manually measure the depth levels thoroughly before calibrating the sensor (i.e.,
adjusting mounting height) according to another reliable measurement method or
device (e.g., value = 0, if the sensor has been removed from the flow).
The current depth level and range of fluctuation, including minimum and maximum
values, measured by the sensor will display while this window is open. This will
allow the user to determine the stability of flow depth conditions (e.g., surface
roughness). The best results are obtained under conditions where little variation
exists between the minimum and maximum values. Accept the current depth by
clicking on the  (Enter) key.
Enter the manual (field-confirmed) value in the reference field on the next menu.
Figure 8-113 Adjusting the depth measurement