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Sarasota 2000 Ultrasonic Multipath
Flowmeter
Section 4 INSTALLATION Page 4-3
Thermo Fisher Scientific
INSTALLATION
4.5 Connecting transducers to flowmeter
Cables for the ultrasonic transducers should be labelled for identification, cut and pulled
through the ducts or laid in trays back to the flowmeter. Connectors should be fitted to each
end according to the instructions supplied with the connectors.
Where 1 MHz transducers are being installed, the connections are via the transducer boxes
(see Section 2.4.1) which are fitted at the rack assemblies.
Cables for depth gauges other than Sarasota ultrasonic transducers should also be pulled
back to the flowmeter. Generally, if the depth gauge is a pressure transmitter, the attached
cable will be supplied long enough for this purpose without joining.
The transducer cables are to be terminated at the flowmeter end and plugged in to the
flowmeter back panel as shown in Section 2.3.3.1.
Ultrasonic path numbers are as shown, numbered from the lowest path. If 2 paths are at the
same height the firmware will take them as crossed for the purposes of slice allocation and
flow calculation (see 1.2.5). Upstream transducers should be plugged into the upper row on
the back panel and downstream ones to the lower.
4.6 Transducer alignment
At this stage it is usual practice to align the transducers. Each transducer should point at its
partner to within ±1
o
. The method used will vary according to the conditions.
•
Pre-set alignment derived from construction drawings.
•
Visual methods involving pointers and sighting arrangements.
•
Low power laser methods.
If the transducers are in the water, only the first of these may be possible and final adjustment
should then be carried out by adjustments to maximise signals during commissioning.
4.7 Output connections
Output signals should be wired to the peripheral devices according to the connection tables
given in section 2.3. In some cases standard cables will have been provided, eg RS232, or
pre-made cables will have been ordered as part of the contract.
Note
For compliance with EMC emissions control, analogue, BCD and serial i/o cables
should be screened and the screen connected to a 0V pin. Where the connector is a ‘D’ type
connector, the screen may alternatively be connected to the connector body if metal.
4.8 Power Connection
Connection should be made to the external power source according to local or national
regulations. The flowmeter is supplied with a standard 230 volt mains cable for connection to
an AC source in the range 85 to 264 volt AC, 47 to 64 Hertz. This may be connected to the
power outlet via a plug or, more usually via a switched spur. This work should be carried out
by a person with the appropriate qualifications.
See the site data book for details of flowmeters supplied for DC operation.
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