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DOF6000 Series Ultrasonic Doppler Open Channel Flowmeter Manual
Tel: [phone] Mail: [email protected] Page 1
Contents
0B0B0B0B PART 1 INTRODUCTION.............................................................................................. 3
1.110B10B9B10BOverview............................................................................................................................3
1.211B11B10B11BTypical Applications ...........................................................................................................4
1.312B12B11B12BSystem Components..........................................................................................................4
1.413B13B12B13BGetting Started...................................................................................................................4
1B1B1B1BPART 2 OPERATING PRINCIPLES .............................................................................. 6
14B14B13B14B2.1 Overview..........................................................................................................................6
15B15B14B16B2.2 How DOF6000 Transducer Measures Velocity................................................................6
16B16B15B17B2.3 Speed of Sound in Water..................................................................................................7
17B17B16B18B2.4 Site Considerations...........................................................................................................8
18B18B17B19B2.5 Factors Affecting Data Accuracy....................................................................................10
45B45B44B58B2.5.1 Alignment with Flow ..................................................................................................................10
46B46B45B60B2.5.2 Conversion of Logged to Mean Velocity ...................................................................................10
19B19B18B20B2.6 Depth Measurement ......................................................................................................11
20B20B19B21B2.7 Flow Rate Calculations..................................................................................................11
2B2B2B2BPART 3 SPECIFICATIONS.......................................................................................... 12
21B21B20B22B3.1 Specifications..................................................................................................................12
3B3B3B3BPART 4 FLOW CALCULATOR INSTALLATION AND WIRINGS .............................. 14
22B22B21B26B4.1 Flow Calculator Mounting ...............................................................................................14
4.2 Flow Calculator Wirings....................................................................................................14
25B25B24B29B4.3 Flow Calculator Overview...............................................................................................15
4.4 Flow Calculator wirings and Mounting Dimensions ........................................................16
4B4B4B4BPART 5 DOF6000 TRANSDUCER INSTALLATION AND WIRINGS......................... 18
26B26B25B30B5.1 DOF6000 Transducer Mounting .....................................................................................18
27B27B26B31B5.2 Locating DOF6000 Transducer.......................................................................................18
28B28B27B32B5.3 DOF6000 Transducer Pointing Upstream or Downstream? ...........................................19

DOF6000 Series Ultrasonic Doppler Open Channel Flowmeter Manual
Tel: [phone] Mail: [email protected] Page 2
29B29B28B33B5.4 Power Considerations.....................................................................................................19
30B30B29B34B5.5 Signal Cable and Connections........................................................................................20
31B31B30B35B5.6 DOF6000 Transducer Connection Table........................................................................20
5B5B5B5PART 6 FLOW CALCULATOR OPERATION............................................................. 21
35B35B34B40B6.1 General...........................................................................................................................21
36B36B35B41B6.2 Key Instruction................................................................................................................21
37B37B36B42B6.3 Menu Structure ...............................................................................................................22
48B48B47B6.3.1 Communication .........................................................................................................................22
49B49B48B6.3.2 Output........................................................................................................................................23
50B50B49B6.3.3 Data logger................................................................................................................................23
51B51B50B6.3.4 External L&V .............................................................................................................................23
52B52B51B6.3.5 Service.......................................................................................................................................24
38B38B37B6.4 Application Example .......................................................................................................24
53B53B52B6.4.1 Partially Filled Pipe Examples....................................................................................................24
54B54B53B6.4.2 Open Channel Examples ...........................................................................................................25
55B55B54B6.4.3 User Define Examples................................................................................................................26
39B39B38B6.5 Offset Area Setting..........................................................................................................27
6B6B6B6BPART 7 WARRANTY AND SERVICE.......................................................................... 28
40B40B39B43B7.1 Warranty ........................................................................................................................28
41B41B40B44B7.2 Service............................................................................................................................28
7B7B7B7BAPPENDIX A – INSTALLATION CHECKLIST ............................................................ 29
8B8BAPPENDIX B – COMMUNICATION PROTOCOL........................................................ 29
9B9B8B8BAPPENDIX C – EXPANDING HOOP ........................................................................... 31
43B43B42B46B1.1 Hoop Size Selection........................................................................................................31
44B44B43B47B1.2 Installation.......................................................................................................................32

DOF6000 Series Ultrasonic Doppler Open Channel Flowmeter Manual
Tel: [phone] Mail: [email protected] Page 3
0B0B0B0B PART 1 Introduction
DOF6000 Area-Velocity Ultrasonic flow meter is specially intended for flow
measurement in partially filled pipes, culverts, channels, streams, rivers and discharge
pipe etc. It has great practical utility especially in flow measurement of water
conservancy. DOF6000 has been an indispensable tool for energy saving, sewage
discharge restriction, reasonable use water resource.
1.1 10B10B9B10BOverview
DOF6000 Flow Meter consists of flow calculator, 6526 integrated transducer to
measure velocity and level at the same time.
The flow calculator can display the velocity, level, flow rate and flow totalizer. It also
can be available with 4-20mA, RS485(Modbus)/GPRS and SD card logger outputs.It
can record data of flow rate and total flow with a SD card up to 16GB.
The flow calculator can calculate the cross-sectional area of partially filled pipe, open
channel stream or river, for stream or river, it can input up to 20 coordinate points
describing the river’s shape of cross section. It is suitable for various applications.
6526 Velocity and Level Transducer is a unique combination of water velocity, depth
and temperature instruments integrated with a solid state logger. It is a new generation
of intelligent flow measurement systems.
By using digital signal processing techniques, DOF6000 Transducer is able to perform
in a wide range of environments. It is used to record flows in pipes, channels and small
streams and operates in a wide range of water qualities from fresh streams to primary
sewage channels.
DOF6000 Transducer is mounted on (or near to) the bottom of the stream/pipe/culvert
and measures the velocity and depth of the water flowing above it.
DOF6000 systems have been tested in small streams and pipes, and the calibration
has been verified in a tow tank. Indications are that different channels have different

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DOF6000 Series Ultrasonic Doppler Open Channel Flowmeter Manual
Tel: [phone] Mail: [email protected] Page 5
2 Connect IN_RS232/485 terminal of flow calculator to DOF6000 Transducer.
3 Connect DC12V OUT “+ -” terminal of flow calculator to power DOF6000
Transducer .
4 Power on Flow Calculator.
5 Set parameters and begin to do the measurement. (Note: Flow Calculator must be
set “close” in External L&V)
Parameter setup in flow calculator:
First, set “Close” in “External L&V”;
Second, set measuring type in “Area”; If select “Pipe”, then set pipe diameter, offset
and dead zone. If select “Rect”, then set the width of rectangle. If select “UserR”, then
set the point coordinates.
The transducer has a 10mm offset, so when using it, the 10mm offset should add to
cross-sectional area.
If customer needs output, please set related parameters in “Output”.
Note: When setup parameters in flow calculator, users must connect transducer to
flow calculator, if not, pressing key is invalid.
1B1B1B1

DOF6000 Series Ultrasonic Doppler Open Channel Flowmeter Manual
Tel: [phone] Mail: [email protected] Page 6
1B1B1B1BPART 2 Operating Principles
DOF6000Transducer measures velocity, depth and temperature. The measured data
are scaled and processed during presentation and processing.
Connect DOF6000Transducer to Flow Calculator DOF6000, Flow Calculator can get
measured data and display level, velocity, flow rate and total flow. Flow Calculator also
can logged flow rate and total flow by SD card on main board.
14B14B13B14B2.1 Overview
Water Velocity in the vicinity of the DOF6000 Transducer is measured acoustically by
recording the Doppler shift from particles and microscopic air bubbles carried in the
water.
Water Depth above the DOF6000 Transducer is measured by a pressure Transducer
recording the hydrostatic pressure of water above the instrument.
Temperature is measured to refine the acoustic recordings. These are related to the
speed of sound in water, which is significantly affected by temperature.
Battery Voltage is measured to allow the transducer to stop operating if the supply
voltage is below defined limits.
Flow rate and total flow values are computed by flow calculator from user defined
channel dimension information.
15B15B14B16B2.2 How DOF6000 Transducer Measures Velocity
When sound is reflected from a moving target the frequency of the sound is varied by
the velocity of the target. This variation is known as a Doppler shift. To measure water
velocity in open channels, the transducer exploits the particles moving with the water
as acoustic targets (or scatterers) from an instrument fixed to the bed or bank.
There are two distinct types of Doppler instruments that can be used to measure water
velocity:

DOF6000 Series Ultrasonic Doppler Open Channel Flowmeter Manual
Tel: [phone] Mail: [email protected] Page 7
•Coherent (or profiling) Dopplers transmit encoded pulses with the carrier frequency at
target locations, and only measure signals reflected from these targets. This allows the
velocity in a stream to be profiled. These instruments are complex and expensive.
•Incoherent (or continuous) Dopplers like the DOF6000 Transducer, emit a continuous
signal and measure any signals returning from scatterers anywhere and everywhere
along the beam. These are resolved to a mean velocity that can be related to a channel
velocity at suitable sites.
During a measurement cycle, ultrasonic sound is transmitted continuously at a fixed
frequency, called a carrier. A receiver listens for reflected signals from any targets. A
measuring circuit detects any frequency changes. A processing system accumulates
and analyses these frequency changes and calculates a representative Doppler shift
from the range received.
Each Doppler shift is directly related to the water velocity component along the beam.
This is a physical relationship and if you know the speed of sound in water you can
calculate the velocity of the reflector and thereby the velocity of the surrounding water.
The transducers do not need calibration for velocity measurement.
The velocity measured is the component along the beam. Because the beam is at an
angle to the flow, the Velocity is adjusted by the angle cosine.
16B16B15B17B2.3 Speed of Sound in Water
Velocity measurements are directly related to the speed of sound in water. The factor
used to scale the transducer Velocity measurement is based on the speed of sound in
fresh water at 20°C (see table below). This velocity of sound gives a calibration factor
of 0.550mm/sec per Hz of Doppler shift.

DOF6000 Series Ultrasonic Doppler Open Channel Flowmeter Manual
Tel: [phone] Mail: [email protected] Page 8
This calibration factor may be adjusted for other conditions. For example, the
calibration factor for sea water is 0.5618mm/sec/Hz.
The speed of sound varies significantly with water density. Water density is dependent
on pressure, water temperature, salinity and sediment content. Of these, temperature
has the most significant effect and it is measured by the transducer and applied in the
correction of velocity measurements.
The transducer corrects for the variation of the speed of sound in water due to
temperature using a factor of 0.00138mm/s/Hz/°C. This correction is a best fit for water
temperatures between 0°C to 30°C.
The following table shows how the speed of sound varies with temperature and
between fresh and sea water.
Bubbles in the water are desirable as scatterers, but too many can affect the speed of
sound. In air the speed of sound is about 350 m/s.
17B17B16B18B2.4 Site Considerations
The Doppler signal received, and the accuracy of the computed velocity, is related to
the flow and cross-section characteristics of the site. A suitable site has the following
features:

DOF6000 Series Ultrasonic Doppler Open Channel Flowmeter Manual
Tel: [phone] Mail: [email protected] Page 9
Feature Description
Flows are laminar
and the velocity
measured by the
Transducer can be
related to the mean
velocity of the
channel.
Velocity is measured from a limited path in front of and
above the acoustic sensors. This area varies with the
amount of suspended material in the water and the
channel characteristics. The user has to determine the
relationship between the measured and mean velocity.
The channel cross
section is stable. The relationship between water level and the cross- sectional area is used as part of the flow computation.
Velocities are
greater than 20 mm
/ second.
The Transducer does not process velocities slower
than this. The maximum velocity is 5 metres / second.
The Transducer will measure velocities in both
directions.
Reflectors are
present in the
water.
Generally the more material in the water the better.
Transducer generally works well in clean natural
streams but problems may be encountered in
extremely clean water.
No excessive
aeration.
Bubbles are good scatterers and occasional small
bubbles will enhance the signal. However the speed of
sound can be affected if there are excessive amounts
of air entrapped in the flow.
The bed is stable
and Transducer
will not be buried
by deposits.
Some coating and partial burying has little effect on the
measured velocity but it should be avoided.
Other site considerations relate to the physical suitability for installation and operation
of the transducers.
Safe working environment - particularly if you are measuring wastewater pipes or in
confined locations.
Access is possible - to check readings of depth and velocity on flow calculator at the
Transducer location, to verify the data produced.
Secure installation - resistant to vandalism and as inconspicuous as possible.