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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
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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
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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
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•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
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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
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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.

DOF6000 Series Ultrasonic Doppler Open Channel Flowmeter Manual
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18B18B17B19B2.5 Factors Affecting Data Accuracy
DOF6000 Transducer measures velocity to an accuracy of ±2% and depth to ±0.25%
of calibrated range. This is logged to a resolution of 1 mm/sec and 1mm respectively.
The transducers have been calibrated and are expected to be stable for long periods
provided they are not physically damaged, blocked or buried.
The purpose of the DOF6000 Transducer is to produce FLOW DATA. This is the
product of the cross section (derived from measured depth) and velocity data, each of
which is modified by user defined factors before use. There are many opportunities for
errors to accrue in the process and degrade the result. These can be reduced or
eliminated by using the instrument properly. Some of the more significant potential
error sources follow.
45B45B44B58B2.5.1 Alignment with Flow
For the calibration to be valid, the Transducer needs to be horizontally and vertically
aligned with the flow. While DOF6000 Transducers are calibrated pointing into the flow,
they can be pointed downstream with little loss of calibration accuracy. You may want
to do this when fouling of the sensor face is a problem.
Any angled flow in the horizontal plane will reduce the recorded velocity. A 10 degree
angle will reduce the velocity recorded by 1.5%.
More significant errors will result from angled flow in the vertical plane. The sensors are
manufactured to project acoustic signals at 30° above horizontal when the sensor is
mounted horizontally. A 10° vertical flow angle change will cause errors of
approximately +8.5% (@20°) and –11.5% (@40°).
46B46B45B60B2.5.2 Conversion of Logged to Mean Velocity
The logged velocity data may have to be adjusted during post processing to reflect a
mean velocity for the channel. The factors used will be site specific and have to be
determined by the operator. This is done by obtaining a mean channel velocity by
conventional techniques and comparing it with the average logged velocity. If
necessary this process should be repeated at various discharges.
Where the relationship is complex or unstable, the accuracy of this method is
compromised.
In laminar flow conditions the channel mean velocity could be expected to be between
90% and 110% of the logged velocity.
In small channels (say a 500mm diameter pipe) the factor may be close to 100% as a
representative area of flow will have been “seen” by DOF6000 Transducer and
contributed to the logged velocity.

DOF6000 Series Ultrasonic Doppler Open Channel Flowmeter Manual
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In larger channels only the area adjacent to transducer will be “seen” and the
relationship will depend on how this portion relates to the vertical and horizontal
velocity distribution in the channel. An instrument located in the centre of the stream
would normally be in a higher velocity area. However in a deep channel transducer
may only see the slower portion of the velocity profile.
19B19B18B20B2.6 Depth Measurement
Water depth is measured using a solid state pressure sensor mounted underneath the
DOF6000 Transducer and vented to atmospheric pressure via a vent tube inside the
signal cable.
Water pressure is sensed via a pressure damping manifold which has been designed
to sense depth in front of the velocity Transducer.
The shape of the sensing manifold is designed to reduce velocity effects on the
pressure sensor. These effects are significant at velocities above 2m/sec.
The vent tube is opened to the atmosphere through the signal cable connector.
20B20B19B21B2.7 Flow Rate Calculations
Most users will record velocity and depth for later analysis. However, Flow Calculator
has the capability of performing Flow Rate and Total Flow computations.
From these computed you may display and record Flow Rate and Total Flow (volumes).

DOF6000 Series Ultrasonic Doppler Open Channel Flowmeter Manual
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2B2B2B2BPART 3 Specifications
21B21B20B22B3.1 Specifications
Flow Calculator
Enclosure:
Fixed: NEMA 4X [IP66], Fiberglass
244L×196W×114H (mm)
Portable: NEMA 4X [IP65], ABS
270L×215W×175H (mm)
Power
Supply:
Fixed: 85~265VAC, 50/60 Hz ±5%, 5VA Max
Or 24VDC
Portable: rechargeable lithium battery, 24VDC, 12Ah, Over 40 hours working
time on a full-charge
Charger: 85~265VAC , 50/60 Hz, 200mA
Outputs: 4-20mA(output load 250-500Ω), RS485(Modbus), GPRS (optional), SD card to
record data
Temperature: -20 to +60℃
DOF6000 Transducer
Enclosure: PVC body. Stainless steel mounting plate.
290mm x 70mm x 25mm (L x W x H)
Weight: 850g (2kg with 15m cable)
Cable: 15 metres, 9 way vented cable «SQL» Compatible
Temperature: -17°C to 60°C, Resolution: 0.1°C

DOF6000 Series Ultrasonic Doppler Open Channel Flowmeter Manual
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Velocity
Range: 21mm/s to 4500mm/s bidirectional
Resolution: 1mm/s
Accuracy: 2% of measured velocity
Signal Path: 30° above horizontal
Depth
Ranges: Model 6526H2 0 to 2m
Model 6526H5 0 to 5m
Resolution: Model 6526H2 0 to 1m – 1mm
1 to 2m – 2mm
Model 6526H5 0 to 2.5m – 2.5mm
2.5 to 5m – 5mm
Accuracy: ±0.25% of calibrated lower range
Type: Hydrostatic pressure sensor vented to atmosphere.
Offset 12mm

DOF6000 Series Ultrasonic Doppler Open Channel Flowmeter Manual
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3B3B3B3BPART 4 Flow Calculator Installation and Wirings
22B22B21B26B4.1 Flow Calculator Mounting
Mount flow calculator in a location that is:
zWhere little vibration exists
zProtected from falling corrosive fluids
zWithin ambient temperature limits -20 to +60°C
zOut of direct sunlight. Direct sunlight may increase transmitter temperature to above
the maximum limit
4.2 Flow Calculator Wirings
Fixed Flow Calculator Wirings
Fixed Flow Calculator Wiring Diagram
In the right of above picture is AC85-265V which is connected to external power
supply.
DC24V is connected to external 24VDC power supply.
RS232 is connected to transducer four wires cable.
12VOUT is connected to transducer power supply.
I-OUT is 4-20mA output interface.
MODBUS “A B” is RS585 output interface.

Portable Flow Calculator Wires
The portable DOF6000 flow meter is equipped with a rechargeable lithium battery. This
battery will require charging before initial operation. Apply 85~265VAC power, utilizing
charging adapter and charging cable to the portable flow meter for a period of 8 hours
prior to using the product for the first time. The charging connection located on the side
of the enclosure as label.

DOF6000 Series Ultrasonic Doppler Open Channel Flowmeter Manual
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The portable flow meter’s integral battery provides continuous operation for up to 40
hours on a full-charge. To obtain the greatest capacity and longevity from the battery,
the following practices are recommended:
• Do not allow the battery to completely discharge. (Discharging the battery to the point
where the LOW BATTERY indicator illuminates will not damage the battery. Allowing
the battery to stay discharged for long periods of time can degrade the storage capacity
of the battery.)
NOTE: Commonly, the battery is charged for a period of 6-8 hours and needn’t over
charge. Unplug from line power when the CHARGING indicator goes out.
• If the portable flow meter is stored for prolonged periods of time, monthly charging is
recommended.
• If the portable flow meter is stored for prolonged periods of time, had better store at a
temperature below 70ºF [21ºC].
Transmit Output Power
25B25B24B29B4.3 Flow Calculator Overview
Wall-mounted flow calculator Portable flow calculator

DOF6000 Series Ultrasonic Doppler Open Channel Flowmeter Manual
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4.4 Flow Calculator wirings and Mounting Dimensions
Wall-mounted Flow Calculator Mounting Dimensions
Wall-mounted Flow Calculator wirings

DOF6000 Series Ultrasonic Doppler Open Channel Flowmeter Manual
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Portable Flow Calculator wirings
Portable Flow Calculator Mounting Dimensions

DOF6000 Series Ultrasonic Doppler Open Channel Flowmeter Manual
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4B4B4B4BPART 5 DOF6000 Transducer Installation and Wirings
DOF6000 Transducer is a very effective
alternative to conventional flow
measuring installations for small streams.
DOF6000 Transducer is unobtrusive and
ideally suited to flow conditions in
culverts, channels and drains. Cost,
maintenance and environmental impact
of new installations is minimized by avoiding the construction of conventional flow
measuring structures.
26B26B25B30B5.1 DOF6000 Transducer Mounting
A versatile mounting bracket is available to secure a DOF6000 Transducer Instrument
into a channel or a pipe. Loosening the nuts enables the instrument to be removed for
inspection. The bracket saddle locks the instrument into its correct position and
alignment.
Before Tightening Mounting Bracket …
Check there is no debris between it and the DOF6000 Transducer.
Do not over tighten!
27B27B26B31B5.2 Locating DOF6000 Transducer
A typical installation is in a pipe or culvert with diameters between 300 and 5000 mm.
DOF6000 Transducer should be located near the downstream end of a straight and
clean culvert, where non-turbulent flow conditions are maximised. The mounting should
ensure the unit sits right on the bottom to avoid debris catching beneath it.
When installing transducer in pipes or culverts, users can directly weld the mounting
bracket in pipe, and then put the transducer into mounting bracket. Or users can make
an expanding hoop shown as below, weld the mounting bracket on it, put the
transducer into the mounting bracket, and then fix the whole component into pipes.

DOF6000 Series Ultrasonic Doppler Open Channel Flowmeter Manual
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In culverts the transducer can be mounted on a stainless steel hoop that is slipped
inside the pipe and expanded to lock it in position. In open channels special mounting
brackets may be required. Special protection from vandalism and interference may also
be required.
The transducer can be located at the invert of the pipe but may be better located
slightly to one side of the invert to avoid alluvial material or heavy debris transported
during higher flows. It will not be affected by being located partly up the side of a pipe
provided it remains aligned with the flow. For details of installing DOF6000 Transducer
in a pipe using the Expanding Hoop see the Appendix.
The transducer can also be located in the bed of a natural or artificial channel. Again it
should be installed and located in such a way as below to avoid accumulating debris,
being buried by alluvial material or getting washed away. The cable should be
protected from damage.
28B28B27B32B5.3 DOF6000 Transducer Pointing Upstream or Downstream?
DOF6000 Transducer can be pointed either upstream or downstream, depending on
which would produces more accurate data.
Pointing the transducer end downstream will stop it accumulating debris, however in
some channels the transducer body may disturb the velocity distribution unacceptably.
The velocity reading will be positive when pointing upstream and negative when
pointing downstream. DOF6000 Transducer may be configured to only read positive
velocities regardless of water flow direction.
29B29B28B33B5.4 Power Considerations
DOF6000 Transducer is powered from 12VDC output of flow calculator connected to
the signal cable.