Section 3: Installing System
SBE 45
17
Sea-Bird does not provide detailed installation instructions for the MicroTSG,
given the unique nature of every ship and type of installation. The installation
of the MicroTSG should be done by qualified shipfitters, with the oversight of
a competent ship designer or naval architect. Consider the following:
•
The MicroTSG can be mounted anywhere it will
fit
that is accessible for
maintenance and cleaning.
For safety, mount the MicroTSG above the
water line.
¾
If the remote temperature sensor is not used, mount the MicroTSG as
close to the seawater intake as possible to avoid thermal
contamination from long plumbing runs. Thermal contamination will
not affect salinity accuracy, but the MicroTSG will report the
temperature of the water when it reaches the instrument.
¾
If the remote temperature sensor is used, the MicroTSG can be
mounted in the ship’s lab or other convenient location.
•
Sea-Bird does not recommend or supply a pump.
¾
The pump must provide 10 to 30 milliliter/second
(0.16 to 0.48 gallons/minute) flow.
¾
Pressure at the MicroTSG is limited to 34.5 decibars (50 psi).
¾
Research vessels often maintain seawater delivery systems for a
variety of scientific purposes, including feed to a thermosalinograph.
Many vessels use engine raw cooling water. However, because the
MicroTSG is designed for a flow rate of 10 to 30 milliliters/second,
ensure that most of the coolant flow bypasses the MicroTSG.
¾
Pleasure-boat pumps designed for salt water and for below-fluid level
(non-priming) may be satisfactory, although their flow rates are much
too high (more than 15 gallons/minute). Some method – flow
restricting orifice, bypass, etc. – is needed to reduce the flow rate to
the required level. Additionally, pleasure-boat pumps are not usually
certified for below-waterline use.
•
Bubbles in the plumbing of a flow-through system are a common problem
and will cause noisy salinity data. To minimize bubbles:
¾
Place the pump below the water line to
push
rather than
lift
the water.
¾
Locate the MicroTSG’s hull intake as deep as possible, as far as
possible from bubble sources (bow wake, propeller, etc.).
•
Depending on the chosen design of a permanent seawater supply
(including pump, intake fitting, pipes, etc.), a de-bubbling device may be
needed to separate bubbles from the water before it enters the MicroTSG.
Note that a de-bubbler may cause additional temperature errors for the
MicroTSG’s primary temperature sensor; salinity accuracy (and accuracy
of an optional remote temperature sensor) is not affected. Not all ships
require de-bubblers, but many do for best quality salinity data. Large
single point salinity spikes can be removed with the Wild Edit module in
SBE Data Processing.
•
Route cabling as cleanly as possible, avoiding sources of noise. Electric
motors are a particular problem. Avoid routing the cable next to
generators and air conditioners. Cables longer than 3 meters should be
installed inside an earthed metal conduit by a qualified electrician. This
minimizes the potential for external signals to disrupt communication and
ensures that high voltage lines (such as the sea cable) are sufficiently
protected. Cables shorter than 3 meters can be used without shielding
when installing or bench testing the instrument.
•
If practical, mount the optional SBE 38 remote temperature sensor outside
the hull. However, the SBE 38 is usually mounted in the remote sensor
mount kit, which has 1-inch pipe threads on each end; plumb the mount kit
into your seawater system. Install the SBE 38 as close to the seawater intake
as possible (before the pump), near the bow of the ship. Since the
installation is below the water line, consult your ship’s engineer / naval
architect / shipyard regarding the actual installation. We cannot offer advice
in this matter as each ship is different and plumbing regulations vary.
Note:
The optional Interface Box appends
data from the optional SBE 38
remote temperature sensor to the
MicroTSG data stream.
22
Содержание SBE 45 MicroTSG
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