Thermo Scientific Sarasota 2000, HB-S2000 User Manual

Sarasota 2000

Ultrasonic Multipath Flowmeter

User Guide
P/N HB-S2000

Revision A

Part of Thermo Fisher Scientific

Sarasota 2000

Ultrasonic Multipath Flowmeter

User Guide
P/N HB-S2000

Revision A

©2007 Thermo Fisher Scientific Inc. All rights reserved.

All trademarks are the property of Thermo Fisher Scientific Inc. and its subsidiaries.

Thermo Fisher Scientific (Thermo Fisher) makes every effort to ensure the accuracy and completeness of
this manual. However, we cannot be responsible for errors, omissions, or any loss of data as the result of
errors or omissions. Thermo Fisher reserves the right to make changes to the manual or improvements to
the product at any time without notice.

The material in this manual is proprietary and cannot be reproduced in any form without expressed
written consent from Thermo Fisher.

Thermo Fisher Scientific
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Sugar Land, TX 77478
USA
Phone: [phone]
Fax: [phone]
Web: www.thermofisher.com

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14 Gormley Industrial Avenue
Gormley, Ontario L0H 1G0
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Phone: [phone]
Fax: [phone]

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Sarasota 2000 Ultrasonic Multipath Flowmeter

SECTION 1
INTRODUCTION

1.2.1 The Standard

1.3 Implementation of principles in Sara sota 2000

1.1 Applications

1.2 Principle of operation

1.2.2 Velocity x area method

1.2.3 Water level

1.2.4 Water velocity

1.2.5 Flow determination

1.2.5.1 Mid section method

1.2.5.2 Mean section method

1.2.6 Path configurations

1.2.7 Transducer frequency

1.2.8 Minimum depth of water

1.2.9 Performance estimates

INDEX

SECTION 2
SYSTEM COMPONENTS

2.1 Flowmeter system overview

2.2 Family tree

2.3 Flowmeter contents and options

2.3.1 Flowmeter layout

2.3.2 Core items

2.3.2.1 Power supply

2.3.2.2 Central processor

2.3.2.3 Keyboard and display

2.3.2.4 Serial connections

2.3.3 Optional items

2.3.3.1 Transducer I/F card

2.3.3.2 Input/output card

2.3.3.2.1 I/O card layout

2.3.3.2.2 Analogue I/O

2.3.3.2.3 16 bit BCD & encoder

2.3.3.3 Relay (VFC) card

2.4 Ultrasonic transducers

2.4.1 1 MHz transducers

2.4.2 500 kHz transducers

2.4.3 Lower frequency transducers

2.4.4 Maximum cable lengths

2.5 Controls and displays

2.5.1 Panel layout

2.5.2 Screen organisation

2.5.3 Status indicator

2.6 Software & firmware

2.6.1 Operating firmware

2.6.2 “GAFA” PC software

2.7 Documentation

INDEX Page 1

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath Flowmeter

SECTION 3
PERIPHERAL EQUIPMENT

SECTION 4
INSTALLATION

4.1 Safety

SECTION 5
COMMISSIONING

5.1 Site dimensions

SECTION 6
CALIBRATION/
VERIFICATION

3.1 Additional items

3.2 Transducer mounting hardware

4.2 General

4.3 Unpacking and laying out

4.4 Installing transducer assemblies

4.5 Connecting transducers to flowmeter

4.6 Transducer alignment

4.7 Output connections

4.8 Power connection

5.2 Powering up

5.3 Programming

5.4 Setting up

5.5 Outputs

6 Calibration/verification

INDEX

SECTION 7
MAINTENANCE

7.1 Channel maintenance

7.1.1 Weed

7.1.2 Profile

7.1.3 Debris

7.2 Flowmeter maintenance

7.3 Routine checks

7.3.1 Remote

7.3.2 On site

INDEX Page 2

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath Flowmeter

APPENDIX 1
LCD SCREENS
A1.1 Screen organisation chart

APPENDIX 2
GAFA PC SOFTWARE
A2 GAFA PC software

A1.2 Screen types
A1.3 Screen selection and data entry
A1.4 Power off mode
A1.5 Screens

INDEX

APPENDIX 3
SPECIFICATION
A3.1 Enclosure

A3.2 Power supply

A3.2.1 AC supply

A3.2.2 12 volt DC supply
A3.3.3 24 volt DC supply

A3.3 Electronics

A3.4 Transducers

A3.4.1 1 MHz

A3.4.2 500 kHz
A3.4.3 Other frequencies
A3.4.4 Transducer ca ble

A3.5 GAFA software
APPENDIX 4

REFERENC ES
A4 References

APPENDIX 5
SITE DATA BOOK
A5.1 Model and serial number

A5.2 Site and customer
A5.3 General description
A5.4 Software issue
A5.5 Card layout in rack
A5.6 Programmed data
A5.7 Schedule of drawings
A5.8 Test certificates

INDEX Page 3

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath Flowmeter

This page is blank

INDEX

INDEX Page 4

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath
Flowmeter

INTRODUCTION

1 INTRODUCTION

1.1 Applications

The Thermo Scientific Sarasota 2000 is a velocity x area open channel flowmeter which uses
the ultrasonic “time of flight”, also known as the “transit time” method.

Unlike traditional methods of open channel flow measurement which use weirs or flumes, the
transit time method creates no obstruction and assumes no relation between level and flow. It
will correctly determine flow throughout its designed range by measuring water velocity and
cross section area (see Section 1.2).

The method is tolerant of backwater effects caused by tides, downstream confluence or
blockages. Unlike a weir or flume it does not drown out at high flow conditions.

The method employs the transmission of ultrasonic “beams” which can be affected by factors
which impede or deflect them. For this reason the method should not be used in situations of:

• Aerated water

• Weed growth between the transducers (unless it is regularly cut)

• High levels of suspended solids (greater than 2000 mg/l) *

• Gradients

• Gradients

* In relatively small channels (up to 5 metres) the method is more tolerant of suspended solids
and therefore is often used in sewage applications.

Though described as an open channel method, the flowmeter may be used in closed
conduits, including those which run full. In the latter case, the cross section area is defined by
the conduit geometry without the need to measure water level.

Suitable applications include water flow measurement of:

• Rivers

• Canals

• Aqueducts

• Irrigation conduits

• Sewage discharges

• Sewage works

• Industrial discharges

• Power generation

Note that although the flowmeter is most often used for open channels or part filled conduits,
it is often used for conduits which always run full. Under these circumstances it is not
necessary to have a depth input but steps need to be taken to ensure that the flowmeter
always takes the conduit as full. This is done via the encoder depth input. The conduit shape
must still be entered.

of salinity (the actual value of salinity is, however, unimportant)
of temperature (the actual temperature is, however, unimportant)

Section 1 INTRODUCTION Page 1-1

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath
Flowmeter

1.2 Principle of operation

1.2.1 The Standard

The Sarasota USMP is a velocity x area open channel flowmeter which uses the ultrasonic
“time of flight” method. This is also known as the “transit time” method. It complies with the
International Standard ISO 6416. The UK version BS 3680 part 3E is identical. The transit
time method belongs to the general category of velocity x area methods. A full description of
the method and its applications is to be found in the Standard. A brief summary is given
below.

1.2.2 Velocity x area method

Velocity x area methods require a means of determining the water velocity and the cross
section area. The product of the two produces the flow rate in a manner which is not
dependent on factors influencing the level, for example downstream constrictions, tidally
influenced wat er level et c.

Assuming the shape of the channel cross section is stable, determination of the area
becomes a matter of measuring water level. This may be done by a variety of methods.

1.2.3 Water level

Water level is required in order to determine the cross section area in an open channel.
Though a single level measurement may be used, it is common to use more than one and to
average them. This has the advantage of a more representative level, particularly if the
measurements are made at different positions, for example on either side of the channel.
Another advantage is that flow may still be computed even if a level sensor fails.

Level may be determined by using one or more ultrasonic transducers in the water facing
upwards. The time taken for a pulse of sound to return to the transducer after being reflected
from the surface is converted into level using the velocity of sound in water as measured on
the water velocity paths (see Section 1.2.4). There is a minimum depth of water required
above the transducer for it to carry out a measurement. This is given in Appendix 3:
Specification.

Water level may also be provided by external auxiliary depth gauges, for example pressure
transmitters, downward facing ultrasonic devices and float systems with shaft encoders.

1.2.4 Water velocity

In the transit time method, water velocity is determined at a number of heights within the body
of water by measurement of time taken for pulses of ultrasound to travel across the channel
at an angle to the flow direction.

Transducers are mounted in the water at or near the sides of the channel with each pair
usually at the same height and aligned so as each one can transmit a “beam” of ultrasound
towards its partner. The ultrasonic “path” between the transducer pairs must be at an angle
(usually about 45

Each transducer acts as a transmitter and receiver and is connected to a processing unit,
which measures the transit time and the time difference.

o

) to the flow direction.

INTRODUCTION

Section 1 INTRODUCTION Page 1-2

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath

θ

Flowmeter

The mean water velocity at the height of each path is determined from these timing
measurements, based on pre-determined geometrical measurements (length of the path and
the angle to the flow direction).

V

It may be shown that the water velocity at the height of the path AB is:

v = L x (T

– TBA) / (TAB x TBA x 2 cosθ)

AB

Where

T
T

= Transit time from transducer A to B

AB

= Transit time from transducer B to A

BA

L = Path length (distance between transducer A and transducer B)
θ = the angle between the “path” and the direction of flow.

1.2.5 Flow determination

The flow is determined by combining the water velocity measurements at the height of each
path with the cross section area defined by the water level and the shape of the channel. The
channel shape need not be the same as the projected width between the transducers. For
example if the transducers are mounted on piles inset from the channel sides. For the
purposes of flow determination the cross section area is divided into horizontal slices
determined by the channel bed, the heights of the paths themselves and the water surface
level.

The channel flow is the sum of the flows in each slice determined by the path velocity or
velocities and the area of the slice. The bottom slice is defined by the bed (which is assumed
not to move) and the top slice by the water level (which is measured). The slice widths may
be determined by the projected width between the transducers or by a separate table defining
the cross section shape.

There are 2 methods, mid section and mean section.

Transducer A

Direction of the Flow

Ultrasonic Path

Transducer B

INTRODUCTION

Section 1 INTRODUCTION Page 1-3

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath
Flowmeter

1.2.5.1 Mid section method

In the mid section method, the slice boundaries are defined by lines mid way between the
paths. The slice velocity is taken as that determined by the path within the slice and the slice
area as the product of the slice height and the (average) width. The upper boundary of the top
slice is the water surface. At the bottom, an additional slice is defined between the bed and a
line half way between the bed and the bottom path. This bottom slice has a weighting factor,
K, normally between 0.4 and 0.8 to allow for the slow moving water near the bed. To reduce
the uncertainty of this factor, the bottom path should be positioned as close to the bed as
practical.

INTRODUCTION

Height H

Top panel

½(H

+ H3)

4

S

Water S u rf ac e

QS = V4 {HS − ½(H4 + H3)}W

QS = ½V3 (H4 – H2)W

3

4

½(H3 + H2)

+ H1)

½(H

2

+ H0)

½(H

1

Height H

0

Bottom panel

QS = ½V2 (H3 – H1)W

QS = ½V1 (H2 – H0)W

QS = ½kV1 (H1 – H0)W

2

1

Width W

Bed

Width W

Illustration of the mid section method for 4 paths

Width W

Width W

Width W

1

Bed

4

3

2

Path 4 H e ight H

Path 3 Height H

Path 2 Height H

Path 1 Height H

Bed Height H

4

3

2

1

0

Section 1 INTRODUCTION Page 1-4

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath

4

Flowmeter

1.2.5.2 Mean section method

In the mean section method, the slice boundaries are defined by the path heights themselves.
The slice velocity is taken as the mean of the upper and lower paths which define the slice
boundaries. The upper boundary of the top slice is the water surface.

The velocit y of the water surface, Vs, is given by:-

Vs = V
Where Ks is a multiplying factor normally between 0 and 1 to allow for the projection

of velocity to the water surface
Vs is limited to a value of V
The lower boundary of the bottom slice is the bed. This bottom slice has a weighting factor,

, normally between 0.4 and 0.8 to allow for the slow moving water near the bed.

K

B

The mean section method is superior in cases where the paths are not near the slice centres,
but the mid section method handles the top slice better. The more paths that are deployed,
the less the differences matter.

The mean section method is illustrated in the following diagram:

+ (V4-V3) x Ks(Hs-H4)/(H4-H3)

4

+ (V4-V3) in the event of (Hs-H4) being greater than (H4-H3)

4

INTRODUCTION

Water Surface

Qs = ½(VS + V4) x (HS – H4) x ½(WS+ W4)

Q

= ½ (V4+ V3) x (H4 – H3) x ½(W4 + W3)

s

= ½ (V3 + V2) x (H3 – H2) x ½(W3 + W2)

Q

s

= ½ (V2 + V1) x (H2 – H1) x ½(W2 + W1)

Q

s

Q

= ½V1(1 + kB) x (H1 – H0) x ½(W1 + W

s

W

W

W

W

Wbed

Width W

4

3

2

1

)

Bed

S

Illustration of the mean section method for 4 paths

Surface Heigh t H

Path 4. Height H

Path 3. H eight H

Path 2. He i ght H

Path 1 Height H

Bed, Height H

S

3

2

1

0

Section 1 INTRODUCTION Page 1-5

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath
Flowmeter

1.2.6 Path configurations

The simplest arrangement is to have a number of paths “in line” above each other. This
would be suitable for a channel of regular cross section shape, which is straight for a long
distance compared with its width (5 to 10 times).

Other configurations are often used in other circumstances. For example:

• Crossed paths where there is uncertainty about the flow direction

• Sloping paths where the de pth is greater on one side compared with the other

• Transducers inset from the banks

• Multiple sets of paths for compound channel shapes

• V configuration used to divide the width because of size or uneven profile

• Multiple channels

• Reflected paths where transducers are on one side only and reflectors “bounce” the

sound pulses back from the far side. This method saves cable but increases path lengths
and is very sensitive to misalignment.

The Sarasota 2000 flowmeter is capable of being configured for these and many other
situations. Please consult Thermo Fisher Scientific for examples and advice.

1.2.7 Transducer frequency

Transducers are manufactured with characteristic frequencies. These will be in the range 1
MHz to 100 kHz. For propagation reasons, the greater the path lengths the lower the
frequency and the larger the transducer. As a guide, path lengths below 10 metres would use
1MHz transducers, 10 to 80 metres 500 kHz, 80 to 150 metres 250 kHz. These figures are for
guidance and the selection may be influenced by other factors relating to the application. For
example, lower frequency transducers may be used to improve penetration in conditions of
high suspended solids provided there is sufficient depth and velocity.

Please consult Thermo Fisher Scientific for advice.

1.2.8 Minimum depth of water

In order to avoid reflections from the bed or surface causing distortion of the ultrasonic
signals, a minimum height of water is necessary above each path. This depends on the
transducer frequency and the path length.

H

= 27 √ ( L / ƒ )

min

INTRODUCTION

Where:

is the minimum height of water above the path, in metres

H

min

L is the path length, in metres

ƒ is the transducer frequency, in hertz
A similar restriction applies to the channel bed, particularly if it is smooth and reflects rather

than absorbs an acoustic signal. The minimum depth of water is therefore usually 2 x H

Section 1 INTRODUCTION Page 1-6

min

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath
Flowmeter

1.2.9 Performance estimates

ISO 6416 describes how to estimate the uncertainty of measurement in any particular
installation. Please consult Thermo Fisher Scientific for advice on this.

1.3 Implementation of the principles of operation in the Sarasota 2000

The principles described in Section 1.2 are used by the Sarasota 2000 subject to certain rules
as listed below. See also Appendix 1:LCD Screens and Appendix 2:GAFA Screens that
describe in detail how the flowmeter is programmed via the LCD screen or PC. Note that the
Sarasota 2000 is a multi-channel device and so paths and levels may be allocated to up to 4
different channels. Overall “station” information (“S” screens) should be entered before
individual channel data (“C” screens). The comments below are how the flowmeter treats
each channel. There are some exceptions, for example, measurement units and flow method
which are common to the station.

Flow

• There is a choice of mean or mid section method of flow calculation.

• The channel cross section shape is entered as a height/width table independent from the

path lengths and angles. (For rectangular or trapezoidal channels it is only necessary to
enter 2 points to define the channels.) The separate table allows the path velocities to be
applied to more accurate slice areas since the defined shape is used rather than a fixed
width for each slice as specified in the Standard.

• Where no path velocity is available, for example at low water height, flow may be inferred

from water level. This is done via a flow estimation table, which may be derived
empiricall y o r by calculation.

Velocity

• The upstream velocity transducers are connected to the upper row of connectors,

downstream to the lower row.

• Path numbering is from the bottom.

• Paths are automatically brought into operation according to the water level and the

programmed minimum water cover.

• Paths entered as being at the same height are taken as crossed, otherwise they are

separate.

• Separate paths may be “normal” with transducers on each side or “reflected” with

transducers on one side only. The latter method saves cable but is not recommended
because of the increased path lengths and sensitivity to alignment.

• The velocities calculated by a pair of paths comprising a crossed path are averaged and

the average velocity used for the slice. The velocity calculated by a separate path is used
alone for the slice.

• When a velocity path fails, the slice boundaries automatically adjust to use only the

working paths.

• A failed path will show on the status indicated on screen C11: Instantaneous Flow &

Level. The path status is a percentage of the “instantaneous” transducer firings which
result in successful reception. If this figure drops below 12% the path is considered to
have failed during the corresponding instantane ous cycle time and is discarded for that
cycle. This could be the result of a fault, misalignment or obstruction.

• Only valid velocity paths which are in the water and covered by sufficient water to be

operating are used for the status indication.

• Each path may have a multiplying factor (“X Factor”) assigned to it. This will normally be 1

but may be different in exceptional circumstances for calibration purposes. An example of
when this might be is when the transducers are not exactly at the channel edges .

• Transducers in each velocity path may be set to operate simultaneously (the norm) or

sequentially. Simultaneous operation allows more measurements in a given time but

INTRODUCTION

Section 1 INTRODUCTION Page 1-7

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath
Flowmeter

there is a small possibility of confusing a signal reflected back to the firing transducer with
one received from the opposite transducer.

Water level

• Levels are combined in the following algorithm:

Only non-faulty measurements are used.
Highest and/or lowest are discarded until 3 remain.
The one furthest from the others is dis carded leaving 2.
The remaining 2 measure ments are averaged for arbitrated level if within an
acceptable band defined on screen C20: Channel Configuration.
If not, level determination fails and flow cannot be calculated.
If only 1 level measurement is installed or only 1 is not discarded, it is used as the
arbitrated level.
If not OK, level fails and flow cannot be calculated.

• Levels defined as valid but rejected by the algorithm will be indicated on the level status,

screen C10: Instantaneous Flow & Level.

• Where the flowmeter is installed in a closed conduit which always runs full, the channel

shape is entered in the usual way but there is no need for a level measurement. The
flowmeter is programmed as though it had an encoder level input (section 2.3.3.2.3) with
a reference level at the top of the conduit and a cal. factor of zero.

Transducer and bed levels

All heights may be set to a fixed datum (local or national) or relative to mean bed level. The
former requires a height for the bed and avoids re-entering all path and level transducer
heights in the event of a change to the bed.

General

• “Instantaneous” means the average over the cycle time scale. This defaults to 10

seconds but may be set to 1 minute for large numbers of paths or long path lengths via
screen S22: Station Configuration.

• The average period is the time over which measurements are averaged for the purpose

of output or logged data. If the cycle time is set to 1 minute, the average period cannot be
shorter.

• At the data logging intervals, the averaged values of the selected data are stored.

• Analogue inputs will normally be linear. However, screen C212: Analogue Input allows

non linear characteristics to be entered.

• When operating on an external 12 volt source, for example from a solar panel, power

saving is possible by using intermittent operation. Power consumption in normal and
intermittent modes is quoted in the Appendix 3:Specification

• The LCD display will turn off 15 minutes after the last keyboard operation. This is to

reduce power and prolong LCD life. Pressing any key will turn it on again.

INTRODUCTION

Section 1 INTRODUCTION Page 1-8

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath
Flowmeter

SYSTEM COMPONENTS

2 SYSTEM COMPONENTS

2.1 Flowmeter system overview

• The Thermo Scientific Sarasota 2000 is an ultrasonic multi-path flowmeter, which

complies with ISO6416.

• It employs state of the art technology to achieve excellent performance in conditions

which have previously be en outside the scope of this type of instrument.

• Smart transducer technology incorporating drive and receiver circuits optimises signal to

noise ratio and minimises losses. The smart circuits are located inside the transducer
housings except for the 1 MHz transducers. In that case they are in sealed in-line
housings known as Tboxes.

• Automatic adjustment of receiver gain and transducer drive voltage (HT).

• Low power consumption and intermittent modes make mains free operation feasible.

• Multi-path operation, (up to 32 via multi-drop facility made possible by smart transducer

addressing.)

• Multiple depth inputs,

- up to 16 ultrasonic depth transducers

- up to 4 auxiliary depth gauges (via 4-20 mA inputs.)

- up to 2 auxiliary depth gauges via BCD inputs

- up to 2 depth inputs via pulses direct from direct from shaft encoder.

• Multiple flow channels – up to 4 separate channels measured by a sin gle instrument. The

velocity pa ths and depths are allocated to the channels durin g set up.

• Up to 4 analogue 4-20 mA outputs and two 16 bit binary coded decimal (BCD) I/Os

• O v er a l l s y st e m al ar m re l ay

• Four relays (volt free contact) option. Programmable, for example for alarms, status,

totaliser pulses.

• Three serial ports. RS232 for PC, RS232 for modem and RS485 for site multi-drop

instrument communications

• IR communication link alternative for PC

• Internal data logger, 1 Mbyte capacity, programmable.

• Water temper ature measurem e nt at each smart transducer (except 1 MHz transduc e r s )

Section 2, SYSTEM COMPONENTS, Page 2-1

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath
Flowmeter

2.2 Family tree

The schematic diagram below is an illustration of a four path system.

SYSTEM COMPONENTS

External
power
source

Transducer A u/s
interface A d/s
(option B u/s
of 1 to 4) B d/s

Level W

Power
supply

Display and
keyboard

Battery

Central
Processor Unit
inc. 3 x serial
I/O & system
relay

Star
J box

Trans. 1 d/s

Trans. 2 d/s

Flow

Auxiliary
depths

Input/output
4-20 mA,
BCD
(option of
none,1,or 2)

Star
J box

Trans. 1 u/s

Trans. 2 u/s

Relays
(4 x VFC)
(optional)

Section 2, SYSTEM COMPONENTS, Page 2-2

Trans. 3 u/s

Trans. 3 d/s

Trans. 4 u/s

Trans. 4 d/s

Level
Transducer

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath
Flowmeter

2.3 Flowmeter contents and options

2.3.1 Flowmeter layout

Fig 1 Sarasota 2000 Flowmeter

Fig 1 shows the front panel view with keyboard, LCD display and status indicator. Also shown
are the IR link and RS232 port, which are alternative methods of connection to a PC, see
Section 2.6.

The contents are described in Sections 2.3.2 (the “core” items which are always present) and
Section 2.3.3 (the items which are optional depending on the number of paths and I/O
requirements).

The keyboard allows access to the flowmeter firmware for setting up and interrogation
purposes, using the display. This is described in Section 2.5

Fig 2 is the same view with the front panel removed to show the layout of the electronic cards,
fuses and power switches.

s„˜„™•š„@m›’šŒ–„š‹@u’š˜„™•”Œ†@f’•ž@mˆšˆ˜

esc

alarm
reset

RS

TQUV

W

XY

P

KOMN

enter

SYSTEM COMPONENTS

status

i˜da

rsRSR

Section 2, SYSTEM COMPONENTS, Page 2-3

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath
Flowmeter

T3.15A F5A

MAINS ISOLATE

SYSTEM COMPONENTS

RS232

Fig 2 Sarasota 2000 Flowmeter internal components

Main rack, from left to right:-

Power supply with fuses and powe r s wi t c h es ( s e e 2. 3 .2.1)
Card position 1 - Status/power management card
Card position 2 - I/O card 1 (if fitted) (see 2.3.3.2)
Card position 3 - I/O card 2 (if fitted)
Card position 4 – Reserved for future enhancements
Card position 5 – Reserved for future enhancements
Card position 6 - TIF 4 (Transducer interface card 4) (if fitted)

For connection to up to 8 velocity paths (16 transducers) via rear panel connectors G
and H, upstream (u/s) and downstream (d/s) and up to 4 ultrasonic depth transducers via
connector Z (see Fig 4 and 2.3.3.1)

Card position 7 - TIF 3 (if fitted)

Rear panel connectors E,F for up to 8 velocity paths and Y for up to 4 depths.

Card position 8 - TIF 2 (if fitted)

Rear panel connectors C,D for up to 8 velocity paths and X for up to 4 depths.

Card position 9 - TIF 1 (always fitted)

Rear panel connectors A,B for up to 8 velocity paths and W for up to 4 depths.

Card position 10 - Central Processor (CPU) (see 2.3.2.2)
The plinth, beneath the main rack, houses the internal battery (see Section 2.3.2.1), the

connectors (see Fig 5) and the relay card.

Note

Power should be switched off and the isolate switch turned off before any cards are

removed or plugged in.

Section 2, SYSTEM COMPONENTS, Page 2-4

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath
Flowmeter

2.3.2 Core items

The enclosur e houses t he followi ng core it ems as well as the opt ional items listed i n Sectio n

2.3.3:

• power supply and status/power management.

• internal battery

• central processor

• display and keyboard

• connectors for transducers and peripheral devices.

2.3.2.1 Power supply

The standard power supply requires a mains input between 85 and 264 volts AC, 47 to 64 Hz,
backed by an internal 12 V battery for operation in the event of AC power failure.

The fuses shown above are 3.15AT (slow blow) for the mains electricity input and 5AF (quick
blow) for the low voltage from the power supply module.

The “POWER” switch isolates the flowmeter and its internal battery from the external (AC)
power source. When switched off, the flowmeter will continue to operate from the internal
battery unless the “ISOLATE” switch is also off. The “ISOLA TE” switc h disco nnect s all powe r
from the flowmeter.

The internal battery is automatically charged by the power supply when external power is
being supplied and the “POWER” switch is on, regardless of the position of the ISOLATE
switch. When the external supply is off the battery is capable of operating the flowmeter for a
minimum of 24 hours. This period will be longer in cases when INTERMITTENT OPERATION
is being used.

Alternatives of 12 V dc and 24 V dc power sources are available as described in Appendix 3:
Specification.

See Appendix 3: Specification for details of power saving through intermittent operation

2.3.2.2 Central processor (CPU)

The central processor carries out the control and timing functions, stores and runs the
operating program and stores the data logs. It controls the status indicator, see “controls and
displays”, Section 2.5.

It also controls the three s erial i/o ports. See section 2.3.2.4

2.3.2.3 Keyboard and display

The keyboard allows the operator to program the flowmeter and to display measurements,
computed results and diagnostic information via the display (see Section 2.5). These
functions may alternatively be performed via the PC based GAFA software (see Appendix 2:
GAFA Screens).

SYSTEM COMPONENTS

.

Section 2, SYSTEM COMPONENTS, Page 2-5

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath
Flowmeter

2.3.2.4 Serial connections

MODEM (RS232)

RS485

Fig 3 Side panel serial connections

There are 3 serial ports:

• RS232 via 9 way D connector (female) on the front of the plinth. See Figs 1 & 2. This port

is used for connection to a PC.

• RS232 via 9 way D connector (male) on the side of the plinth. See Fig 3. This port is used

for connection to a modem.

• RS485 via 9 wa y D connect or (female) on the side of the plinth. See Fig 3. This port is

used for multi-drop instrument connection networks using Modbus protocol in full or half
duplex as set up via the front panel (Appendix 1: LCD Screens). Jumper links on the CPU
board may need to be altered depending on the load conditions. Please consult Thermo
Fisher Scientific for instructions on setting these links.

Pin (F) Signal Comment

2 TxD
3 RxD
5 0V

Pin (M) Signal Comment

1 CD
2 RxD
3 TxD
4 DTR
5 0V
7 RTS
8 CTS
9 R1

Pin (F) Signal Comment

8 B
9 A

Pin (F) Signal Comment

3 0V
4 -RxD
5 +RxD
7 0V
8 -TxD
9 +TxD

RS232, PC connection
Front panel 9 way female D connector

RS232, Modem connection
Side panel 9 way male D connector

RS485, 2 wire connection
Side panel 9 way female D connector

RS485, 4 wire connection
Side panel 9 way female D connector

SYSTEM COMPONENTS

Section 2, SYSTEM COMPONENTS, Page 2-6

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath
Flowmeter

2.3.3 Optional items

The flowmeter enclosure also houses an optional number of the following cards:

• Transducer interface cards (TIFs) (up to 4 may be fitted).

• I/O card (none, 1 or 2 may be fitted)

• Relay (VFC) card (none or 1 may be fitted)

Details are given in Appendix 3: Specification section, but in summary:

2.3.3.1 Transducer interface card (TIF)

SYSTEM COMPONENTS

Fig 4 Transducer Interface Card (TIF)

The flowmet er has capacity for up to four TIFs as st andard. Each one is capable o f being
connected to 2 velocity paths (4 transducers) directly or 8 paths (16 transducers) by multi­drop, and 1 ultrasonic depth transducer directly or 4 by multi-drop. Each TIF must have its
address set via the jumper links PL7 shown in the diagram above. The addresses are in the
form of a binary code with the least significant digit at the top of PL7. No link for 0; link present
for 1.

TIF1, card position 9, address 4, PL7 Links 0100
TIF2, card position 8, address 5, PL7 Links 0101
TIF3, card position 7, address 6, PL7 Links 0110
TIF4, card position 6, address 7, PL7 Links 0111

When setting up the flowmeter, the cards and their addresses are programmed via the
keyboard and screens as described in Appendix 1: LCD Sc reens or v ia GA FA as desc ribed in
Appendix 2: GAFA Screens. When a TIF is changed during service, the replacement must
have the same address set.

Section 2, SYSTEM COMPONENTS, Page 2-7

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath
Flowmeter

Each TIF plugs into the main rack and is wired to the back panel co-axial connector pairs A to
H for onward connection to the velocity path transducers and W to Z for connection to
ultrasonic depth transducers at the time of installation. Fig 5 shows the rear panel connectors.
TIF 1 in card position 7 is connected to A and B and to W.
TIF 2 in card position 6 is connected to to C and D and X etc.
Note that the upstream velocity transducers must be connected to the upper row of A to H
and the downstream ones to the lower row.

The standard rear panel allows connections to 32 velocity paths (64 transducers) and 16
ultrasonic depths via “multi-drop” wiring of the smart transducers.

The velocity transducers may be allocated to up to 4 water channels without any restriction
other than the total number and cable lengths. Ultrasonic depth transducers are limited to 4
per channel via multi-drop. See Section 2.4.

SYSTEM COMPONENTS

PATH A B C D E F G H

FLOW

W Y

X Z

DEPTH

BCD1

BCD2

21

16

15

543876

1817 19 2120 22

9

1210 11 13 14

23

2624 25 2827

Fig 5 Rear panel connections

The top row of coaxial connectors are for the upstream transducers, the bottom row for the
downstream ones.
Paths may be connected individually, for example, path 1 to A, 2 to B etc, or multi-dropped via
star junction boxes. For example, paths 1 to 4 connected to A etc.
Ultrasonic depths may be connected individually to W,X,Y,Z or multi-dropped via star boxes.
For BCD and analogue connections, see Section 2.3.3.2

Section 2, SYSTEM COMPONENTS, Page 2-8

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath
Flowmeter

2.3.3.2 Input/Output card.

2.3.3.2.1 I/O card layout

SYSTEM COMPONENTS

Fig 6 I/O card

Most flowmeters will require this facility. Up to two I/O cards may be fitted.
The cards have an address which is set on the links PL1 as shown in Fig 6. This is similar to
the TIF addressing, with least significant digit at the top.

I/O 1, card position 2, address 2, PL1 Links 0010
I/O 2, card position 3, address 3, PL1 Links 0011

Each I/O card has:

• Two analogue outputs (normally 4-20 mA)

• Two analogue inputs (normally 4-20 mA)

• 16 bi t di gi ta l I /O (4 x 4 bit b i na ry c od e d dec i mal dig it s (B C D)). I n p ut or ou tp ut , s ele c te d b y

jumper on I/O card.

• Phased encoder depth i/p
Fig 5 shows the positions of the connectors. The phased encoder depth inputs share the BCD

connectors .

Section 2, SYSTEM COMPONENTS, Page 2-9

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath
Flowmeter

2.3.3.2.2 Analogue I/O

Analogue connections are normally 4-20 mA and are made to the screw terminal blocks at the
right of the rear panel. The upper block connects to I/O board 1 and the lower to I/O board 2.
Connections 1 to 6 (upper) and 15 to 20 (lower) are the analogue inputs. Connections 7 to 14
(upper) and 21 to 28 (lower) are the 4-20 mA outputs.
The table whi c h f ol l o ws s hows the connections.

Analogue inputs, 4-20 mA (0-20mA) or 0-5V

The total input range is 0-20mA though analogue inputs are normally set up as 4-20 mA. On
board links LK2 and LK4 may be removed to accept 0 to 5 volts instead (Fig 6).
Each i/p has 3 connections, 18 V excitation, input and 0V.
If the external signal source supplies the power, connections are made to input (4-20 mA +)
and to 0V (4-20 mA-).
If the Sarasota 2000 flowmeter is to power the loop, connections are made to 18V (4-20 mA+)
and to Input (4-20 mA-)

Analogue outputs, 4-20 mA

Analogue outputs are always 4-20 mA.
Each o/p has 4 connections, 18V excitation, +V, -V and 0V.
If the Sarasota 2000 flowmeter is to power the loop, the output will not be isolated. A link is
made between 18V and +V and the 4-20 mA loop is between –V and 0V.
If the external device powers the loop, the output is isolated. The 4-20 mA loop is between +V
and -V

Note For compliance with EMC emissions control, analogue i/o cables should be screened
and the screen connected to one of the 0V pins for each i/o card.

See the following table for connection details.

SYSTEM COMPONENTS

Section 2, SYSTEM COMPONENTS, Page 2-10

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath
Flowmeter

4-20 mA CONNECTIO N S (Refer to Fig 5)

Pin Signal Connect for Internal

loop power
1 0V N/C 4-20 mA ­2 Input 4-20 mA - 4-20 mA +
3 18V excitation 4-20 mA + N/C
4 0V N/C 4-20 mA ­5 Input 4-20 mA - 4-20 mA +
6 18V excitation 4-20 mA + N/C
7 0V 4-20 mA - N/C
8 -V 4-20 mA + 4-20 mA ­9 +V 4-20 mA +
10 18V
11 0V 4-20 mA - N/C
12 -V 4-20 mA + 4-20 mA ­13 +V 4-20 mA +
14 18V

15 0V N/C 4-20 mA ­16 Input 4-20 mA - 4-20 mA +
17 18V excitation 4-20 mA + N/C
18 0V N/C 4-20 mA ­19 Input 4-20 mA - 4-20 mA +
20 18V excitation 4-20 mA + N/C
21 0V 4-20 mA - N/C
22 -V 4-20 mA + 4-20 mA ­23 +V 4-20 mA +
24 18V
25 0V 4-20 mA - N/C
26 -V 4-20 mA + 4-20 mA ­27 +V 4-20 mA +
28 18V

Link 9-10

Link 13-14

Link 23-24

Link 27-28

0 – 5 V CONNECTIONS (Refer to Fig 5)

Alternative connections require links LK2 and LK4 to be removed (Fig 6).
Pin Signal Connection Comment

1 0V 0-5 V –ve
2 Input 0-5 V +ve
4 0V 0-5 V –ve
5 Input 0-5 V +ve
15 0V 0-5 V –ve
16 Input 0-5 V +ve
18 0V 0-5 V –ve
19 Input 0-5 V +ve

Connect for external
loop power

N/C

N/C

N/C

N/C

I/O card 1, input 1

I/O card 1, input 2

I/O card 2, input 1

I/O card 2, input 2

SYSTEM COMPONENTS

Comment
I/O card 1, Input 1

I/O card 1, Input 2

I/O card 1, Output 1
Int powered, not isolated
Ext powered, isolated

I/O card 1, Output 2
Int powered, not isolated
Ext powered, isolated

I/O card 2, Input 1

I/O card 2, Input 2

I/O card 2, Output 1
Int powered, not isolated
Ext powered, isolated

I/O card 2, Output 2
Int powered, not isolated
Ext powered, isolated

Section 2, SYSTEM COMPONENTS, Page 2-11

Thermo Fisher Scientific

Sarasota 2000 Ultrasonic Multipath
Flowmeter

2.3.3.2.3 16 bit BCD I/O and encoder input

The 16 bit parallel BCD signal may act as either input or output according to the jumper links
LK1 and 3 on the board. See Fig 6. The default condition is for BCD INPUT
example from a shaft encoder counter.

The format is 5 Volt positive logic, though the input can accept inverted logic if specified via
the screens (Appendix 1: LCD Screens).

Handshaking is via strobes STRB1 and STRB2. STRB1 relates to bits 1 to 8 and STRB2 to
bits 9 to 16.

There are two 25 way female D connectors labelled BCD1 and BCD2. BCD1 is connected to
I/O option card 1 if fitted and BCD2 to I/O option card 2 if fitted.

BCD input

• When used as an input, the 4 digit BCD number is normally used as an auxiliary level.

• Operating units are selected via the screens (Appendix 1: LCD Screens) or GAFA

(Appendix 2: GAFA Screens).

• The BCD number may have an offset applied – “level above datum” if B CD zero does not

correspond to the flowmeter zero level.

• The BCD number may also have a scaling factor applied, for example if a BCD

incremental value of 10 corresponds to 5 mm, the scaling factor is 0.5.

• If the scaling factor is given a negative sign, the BCD input will be taken as negative logic

(low is “1”)

• For BCD input, the STRB is pulled low for 0.2 ms by the Sarasota 2000 when it wants

data.

BCD Output

• When used as an output, the function of the 4 digit BCD number and operating units are

selected via the screens (Appendix 1) or GAFA (Appendix 2). Typically the function will
be flow or water level.

•

For BCD output, the STRB is pulled low for 0.2 ms whilst valid data is being presented.

•

BCD output may be uncoded, in which case the BCD number is taken as it appears, or
coded in which case the first digit indicates a range/sign and the remaining 3 digits the
value. The coding is defined as follows:

Coding for flow

The data is represented as a 4 digit number where the most significant digit is the code:
0 = multiply by 10
1 = multiply by 10
2 = multiply by 10
3 = fault condition, no data
4 = negative flow multiply by 10
5 = negative flow multiply by 10
6 = negative flow multiply by 10
The three remaining digits are the three most significant digits of the reading;
e.g. Flow + 4.28 m3/s Output 0428
Flow +34.28 m3/s Output 1342
Flow - 0.15 m3/s Output 4015

Coding for level

The level data is presented as a 4-digit number, representing the last 4 digits of the displayed
value.
e.g. Flow + 4.123 m Output 4123
Flow +52.678 m Output 2678

0

(i.e. x 1)

1

(i.e. x 10)

2

(i.e. x 100)

0

(i.e. x -1)

1

(i.e. x -10)

2

(i.e. x -100)

SYSTEM COMPONENTS

– no links, for

Section 2, SYSTEM COMPONENTS, Page 2-12

Thermo Fisher Scientific