ChannelMaster Horizontal ADCP

ChannelMaster HADCP

• 2-beam Horizontal Broadband ADCP– Smaller cells– More cells– Lower noise– Lower power– Better data

ChannelMaster HADCPApplications

• Rivers – Index Velocity Method– Velocity, stage, discharge monitoring– Used where simple stage-discharge

relationship fails• Backwater• Tidal• Locked navigation channels• Pumped canal systems

ChannelMaster HADCPApplications

• Ports and Harbors and Waterways– Design – monitor currents before construction– Operation

• Vessel traffic safety - currents• Docking

ChannelMaster HADCPApplications

• Environmental– Velocity or flow triggered sampling– Velocity, flow warning

• Hydraulics Research– Circulation studies in lakes, estuaries– Large scale turbulence in rivers

ChannelMaster HADCPApplications

• Offshore– Monitor current near oil rigs or drill ships– Monitor current near mooring buoys– Research

ChannelMaster Description

• 2 profiling beams – x-y velocity components– 1-128 cells

• Select what is best for your application

– Narrow beam angle – ± 20 degrees• Increases range

– Better signal/noise ratio than 25 deg.

– Reduced boundary interference

• More homogeneous flow

ChannelMaster Description

• Standard sensors– Temperature – need for speed of sound– Pitch and Roll – need for installation– Depth

• 600 kHz vertical acoustic beam– ± 2mm accuracy

• Pressure – ‘reality check’ for acoustic

ChannelMaster Description

• Communications– RS-232/RS-422– SDI-12

• Standard - 27 values per measurement– One instrument at a time

• Concurrent – 20 values per request– Simultaneous instruments

ChannelMaster Description

• Internal 2 MB recorder• 9-18 Vdc power, external• 25 meter cable• Mounting plate included

– Allows removal and replacement without losing alignment

Competitor Comparison

Specification/Feature RDI

ChannelMaster Sontek

SL Nortek EasyQ

Processing Broadband Narrowband Narrowband

Maximum number of cells 128 standard 5 (optional upgrade) 3 (EasyQ or upgrade EasyV)

Minimum Cell Size 10, 20, 40 cm (1200, 600, 300kHz)

20, 40, 100 cm (3MHz,1.5MHz, 500kHz)

40, 80 cm (2MHz, 1MHz)

Maximum Range 20, 60, 200 m 8, 22, 120 m 10, 25 m

SDI-12 Concurrent, Basic Basic Basic

Record with SDI-12 on Yes Yes? No

Pressure sensor Standard Optional Optional

Acoustic stage Standard Optional, except on 500 kHz EasyQ only

Beam angle (degrees) 20 25 25

Beam width (degrees) 1.5, 1.5, 2.2 1.5, 1.5, 1.9? 1.7, 3.0 degrees

Memory 2 MB 4MB 2MB

Power 9-18V 9-16V 9-16

Why Buy RDI?

• Performance– Patented Broadband processing

• For same cell size, reach same accuracy in less time, with less energy

• For same energy, get better accuracy • Use smaller cells where necessary• Get more cells for detail if desired• >15 pings/second with 1200 kHz

– All beams pinged simultaneously

Why Buy RDI?

• Flexibility– One RDI can cover a wide range of

applications• Smaller minimum cells allows use in more shallow

water• More cells allows use in wider channels

Why Buy RDI?

• Versatility– 1200 kHz ChannelMaster matches or beats the maximum range

and minimum cell sizes of :• 1.5 and 3.0 MHz Sontek SL or • 1.0 and 2.0 MHz Nortek EasyQ/EasyV

– And allows use of up to 128 cells

– 600 kHz ChannelMaster matches or beats the maximum range and minimum cell sizes of

• 1.5 and 3.0 MHz Sontek SL or • 1.0 and 2.0 MHz Nortek EasyQ/EasyV

– And gives you up to 90 meter range

Why Buy RDI?

• Versatility– 300 kHz ChannelMaster matches or beats the

maximum range and minimum cell sizes of:• 500 kHz and 1.5 MHz Sontek SL• 1.0 and 2.0 MHz Nortek EasyQ/EasyV

– And gives you up to 300m range!

Range Comparisons

Horizontal Profiling Range

0.51

0.31

20.6

21.2

8

10

20

22

25

60

120

200

0 50 100 150 200 250

3000 SL

2000 EQ

1200 CM

1500 SL

1000 EQ

600 CM

500 SL

300 CM

Inst

rum

ent

Range (m)

Min Max

Why Buy RDI?

• Broadband ADCP Performance– Patented technique– Single ping standard deviation ~7 times better than

Narrowband using same cell size: i.e.: 50 narrowband pings = 1 broadband ping

– Less time, less energy, needed to reach desired accuracy – save money on solar cells and batteries.

– Inland applications are often low velocity: narrowband may need to average for minutes to achieve accurate result – this may cause a bias during changing flow conditions

Why Buy RDI?

• 20 degree beam angle– Fundamental assumption of constant flow at

any cell range– Good in open ocean, less good in rivers– Narrower beam angle reduces effects of

inhomogeneous flow – unmeasured and uncorrected bias. Most important at far end of range.

Who has them installed?

• China > 100

• Mexico > 120

• Great Britain > 25

• USA >70

• Mexico – specified after 6 month comparison vs Sontek