Thermo Scientific HB-S200, User Manual

Page: 35 / 77

Sarasota 200 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 attached to trays and run 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. Care must be taken to
ensure that the transducer vent, which is part of the cable, is open to the atmosphere and in
no danger of becoming blocked or submerged in water.
The transducer cables are to be terminated at the flowmeter end and plugged in to the
flowmeter connection panel as shown in Section 2.3.1.
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).
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, 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 11 to 30 volt DC input with an optional
external mains convertor for connection to an AC source in the range 90 to 264 volt AC, 47 to
63 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.