ADS FlowShark HV Operation and Maintenance Manual QR 775005 A2 July 2010

							ADS FlowShark HV O&M Manual  11 
 Flow Depth  Flow levels must exist  at a depth of at least 2 to 3 inches (51 to 
76 mm)  above the bottom center of the pipe or channel  to successfully obtain 
velocity measurements . 
 Channel Wall/Water Surface  Do not measur e velocity within 1.5 inches 
(38 mm) of the channel wall or flow surface.   
						

							ADS FlowShark HV O&M Manual  13 
 Setup and Operation  
Properly setting up and operati ng the FlowShark HV are critical to obtaining the most 
accurate and  reliable velocity measurements .  Developing a basic understanding of t he 
control unit keyboard and display before taking measurements  is also essential  to 
accessing and interpreting the results correctly.  Th ese combined skills and knowledge 
are fundamental  to performing measurement activit ies effectively and effici ently. 
This section provides general information a nd instructions in the following areas of 
setup and operation of the FlowShark HV:  
 Charging the battery  
 Connecting the sensor to the control unit  
 Operating the FlowShark HV  
 Calibrating the sensor  
 Positionin g the sensor in the flow  
 Taking velocity readings  
 Viewing the results  
Charging the Battery  
Charge the battery before attempting to operate the unit by removing the protective 
cap from the corresponding port  on the FlowShark HV and connecting the battery 
ch arger to the port .  A green light on the charger indicates the battery is fully charged 
and the FlowShark HV is ready for use.  A yellow  light on the charger indicates the 
battery in the FlowShark HV is not fully charged, but is being recharged.  When 
char ging is complete, remove the charger and replace the protective cap on the port.  
After th e initial charge, ADS recommends recharging the battery only once a month 
under normal operating conditions .  This battery type  maintains a longer life and 
capacity wh en recharged less frequently.   However, once every 3 months, ADS 
recommends draining the battery completely before recharging .  The battery is 
considered drained at 10.2 volts.  The unit will not function when the voltage falls 
below 10. 
Warning!   Close the protective cap  manually to avoid damaging the plastic 
threads.  
						

							14 ADS FlowShark HV O&M Manual  
Connecting the Sensor to the Control Unit  
Connect the sensor to the control unit  by removing the protective cap from the 
corresponding por t on the unit and then inserting and screw ing in the connector  from 
the sensor cable in to the port . 
When measurement  is complete, unscrew and remove the sensor connector from the 
control unit and replace the protective cap onto the port . 
Operating the Flow Shark  HV  
Turn on the FlowShark HV  by pressing and holding down the Enter ke y ( ) on the 
control unit  for at least 5 seconds .  The unit temporarily will display the current 
firmware version in stalled and then the current temperature, peak  velocity of the flow , 
average peak  velocity (when initiated manually ), and time period over which the 
average has been  determined.  This screen represents the first of three top- level 
screens accessible through the control unit.   
The second screen displays the battery voltage of  the battery in the control unit and 
indicates  whether the sensor is connected to the control unit.  The third screen 
displays the signal quality  of the measurment, the Doppler frequency, the main peak 
velocity , the designated number of neighborhood peaks , and a histogram representing 
the measurements  taken.  Navigate back ward and forward among these top level  
screens  using the horizontal arrow keys ( , ). 
Turn off the control unit by pressing and holding down the  ESC key on the unit for at 
least 2 seconds.  The unit will turn off automatically followi ng 8 minutes of inactivity 
on the keyboard. 
 
FlowShark HV display  
  
						

							ADS FlowShark HV O&M Manual  15 
Modifying the Parameter Settings 
The lower leve l screens provide access to parameter settings that may be modified to 
provide additional information, compensate for flow conditions, suppor t associated 
hardware, and address other relevant issues involved in velocity measurement 
activities.  The default parameters are set for the FlowShark HV at the factory.  Under 
normal conditions, it should not be necessary to access or modify the parameter 
settings on the control unit . 
Warning!  Making changes to the parameter settings requires a 
comprehensive understanding of the equipment and settings because it can 
have a significant impact on the outcome and accuracy of  the velocity 
measurements.  The refore, please contact a regional ADS representative for 
assistance before setting or modifying any parameters on the FlowShark HV.  
						

							16 ADS FlowShark HV O&M Manual  
Understanding the Keys on the Control Unit  
The following table provides general functional descriptions for the keys on the 
control unit .  Each key serves multiple functions.  The current function of a key  
depends on the current content displayed on the control unit screen. 
Key Functional Description 
ESC  Turns off the 
control unit when held down for more than 2 seconds  
Returns the menu to the previous level 
 Turns on  the  control unit when held down  for at least 5 seconds 
Display s the parameter setting s from the top level 
Displays sub settings of parameter setting s (when applicable)  
Displays  current value/option  setting corresp onding to parameter setting  selected 
Activates editing mode for bracketed text/values ([xxx])  
Deactivates editing mode for bracketed text/values () and saves text/values for 
parameter 
 Scrolls forward through top level screens  
Scrolls forward throug h available parameter settings and subsettings  
Moves cursor forward through individual characters in editable field 
 Scrolls backward through available parameter settings and s ubsettings  
Moves cursor backward through individual characters in editable field 
 Scrolls forward through individual  characters or options in editable field  
Scrolls forward through available options for selection in an editable field representing a 
particular parameter setting  
 Scrolls backward through individual  characters or options in editable field  
Scrolls backward through available options for selection in an editable field representing  a 
particular parameter setting 
Calibrating the Sensor  
Before taking velocity measurements, immerse the sensor into the flow to acclimate 
the FlowShark HV’s integrated temperature sensor to the temperature of the flow.  
Temperature differences between the sensor and flow can produce inaccurate velocity 
measurements.  A difference of only 1°C can lead to a measurement error of 0.24%.   
Acclimat ion is complete when the temperature reading displayed begins to stabilize 
and deviates only within a very limited temperature range of a few degrees. 
Temperature and velocity stabilization may require 1 to 5 minutes upon initial use.  It 
can require sever al minutes if a large difference exists between the temperature of the 
flow and the temperature at the location outside the flow.  
						

							ADS FlowShark HV O&M Manual  17 
Note:  If acclimation and stabilization do not occur within 5 minutes, please 
contact an ADS representative for further assist ance. 
The sensor has been calibrated for measuring velocity in water.  However, if velocity 
measurements will be taken in another kind of medium in which the speed of sound 
differs from that of water (4872 f eet per second (1485 mps) at 20°C  (68°F)), contact 
ADS for assistance in  modifying the calibration factor accordingly when setting the 
parameters.  
Note:  Placing the sensor into the flow before turning on the unit  may 
expedite the temperature acclimation process.  
Positioning the Sensor in the Flow 
Align  the sensor probe parallel to the axis of the pipe/canal.  Use the  bubble level 
attached to the telescoping rod to align the probe horizontally.    
Properly positioning the sensor in the flow is essential to obtaining accurate velocity 
measurements.  Even a slig ht error in angle can produce error s in velocity readings.  
For example, an angle error of 5° will lead to a meas urement error of 0.4%; a 10% 
angle error will resul t in a 1.5% measurement error. 
Taking Velocity Readings  
When immersed in the flow in  a pipe or channel, t he FlowShark HV measures and 
displays the  localized, current peak  velocity.  It also can  provide an average, or mean , 
of the peak velocity over a specific period of time. 
The first (top) row on the control unit  display shows the current peak velocity.  The 
second row displays the current operating temperature read through the temperature 
sensor in the probe.  Select the up arrow key  (
) to view the current raw frequency 
and voltage readings  from which the velocity and temperature readings are calculated .  
The third row displays the average peak  velocity, and the fourth row displays the time 
period over  which the average peak  velocity has been calculated.   
Calculating Average (Mean) Peak  Velocity 
To  view  the average of the peak velocity over  a defined period of time, select the 
down arrow key ( ) to initiate the velocity average calculations and then select the 
same key again after the desi red time  period has passed .  The FlowShark HV displays 
and updates the average velocity following each c onsecutive reading based on the 
cumulative readings taken since the down arrow key was originally selected.  The 
average velocity displayed represents  a “running” average and continues until the 
down arrow key is selected again.   The last average velocity reading and associated  
						

							18 ADS FlowShark HV O&M Manual  
time period over which the average was calculated  will display until a new running 
average velocity i s initiated or the control unit  display is turned off or goes off 
automatically . 
ADS also recommends an ISO standard that includes s everal other methods for 
calculating average velocity using the individual velocity measurements obtained 
through the FlowShark HV:  
ISO 748: 2007, Hydrometry – Measurement of Liquid Flow in Open Channels Using 
Current -Meters or Float s. 
Viewing the Results  
A velocity frequency histogram  shows the distribution of the Doppler frequencies 
emi tted.  Each bar (peak) represents a frequency group, and up to 11 frequency groups 
can display at one  time.  The frequency range is automatically adjusted to fit the range 
of the velocities.   The distribution and formation of frequency groups in the histogram 
indicate the quality of the velocity readings.  
The quality  of a measurement ( ranging from 0 to 100%) represents the correlation 
between the evaluated Doppler frequency and the complete spectrum of the measured 
frequencies.   Typically, higher quality  ratings reflect more rel iable velocity 
measurement s.  However, occasionally,  a velocity measurement with a relatively high 
quality  can be unreliable.  When a measurement is qu estionable, examine the form of 
the frequency distribution.  Velocity measurements with a quality of less than 15% 
will be rejected.   Consider the follow ing sample histograms for reference in  assessing 
histograms: 
  Optimum   Th e following histogram diplays a  narrow frequency range with a 
stable, very high peak. 
--- --------- --- ------ 
 Normal   The following histogram reflects a wid e frequency range with a 
stable,  high peak.  It  has a qualit y rating greater than  40%. 
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							ADS FlowShark HV O&M Manual  19 
 Poor Reflection Quality in Flow   The following  histogram displays a very 
wide range of frequencies with no stable peak , producing a quality rating of 
less than  30%.  The velocity readings displayed are essentially too low , and 
t he  histogram suggests that the low quality rating may be the result of a low 
concentration of reflective particles  that are too small for detection.  Scattering 
or air -injecting r eflective particles , such as sand, into the flow  for a short time 
could improve  the histogram and produce more reliable velocity readings.  
Refer to  the technical specifications for the sensor for specific information on 
the minimum partic ulate size and concentration required for adequate signal 
reflection . 
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 Disturbing Influences   Th e following  histogram reveals a wide range of 
frequenc es with a  random ( jumpy) peak that appears  in several frequency 
groups .  The calculated Doppler frequency (F) jumps significant ly.  Although 
the quality is greater than  40%, the velocity readings are erroneous or unstable 
and inconsistent .  This histogram could reflec t the formation of a whirlpool, 
standing waves, a turbulent flow surface, or a very shallow flow depth.  
Th erefore,  a site exhibiting these conditions would not be  a suitable location 
for obtaining reliable  velocity measurements . 
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