Timing Of Warning Messages; Beam Check; Table 6:5 - Timing Of Quality Control Warning Messages - Xylem SonTek FlowTracker2 User Manual

Warning Reporting
Fractional Point
Depth > 1 Velocity
6.2.2

Timing of Warning Messages

The quality control warning messages are supplied at certain stages of the measurement
process for both the Discharge and General Modes. The timing of the quality control
warning messages are supplied in
indicates General mode
Table 6-5 - Timing of Quality Control Warning Messages
Warning Messages
Low SNR
Approach Low SNR
Beam SNRs Not
Similar
Large SNR Variation
SNR Threshold
Variation
Standard Error > QC
Boundary Interference
High % Spikes
Velocity Angle > QC
Rod Angle > QC
High Stn % Discharge
Water Depth > QC
Stn Spacing > QC
Station Order
Location Outside Edge
Fractional Depth > 1

6.3. Beam Check

Beam Check operates by sending a pulse of sound into the water, and then plotting the
signal to noise ratio of the return signal versus range for each of the FlowTracker2
receivers. This information can be evaluated to determine the effective measurement
range, to look for interference from boundaries/structures, to survey a deployment site,
or to observe the quality of the returned signal.
FlowTracker2 User's Manual (January 2019)
QC Criteria
Fractional Depth < 1. Verify ratio
None between measurement depth and
total depth and this should not >1
Table 6:5.
.
Station Pre
Setup Measurement
D,G
D
D
D
D
D,G
98
SonTek – a Xylem brand
Description
"D" indicates Discharge mode and "G"
Post
Post Station
Measurement
D,G
D,G
D,G
D,G
D,G
D,G
D,G
D
D,G
Suggested Action
• Verify fractional depth
value.
• Re-enter if needed.
Post
Section
D,G
D,G
D,G
D,G
D,G
D,G
D,G
D
D,G
D D
D
D,G