Manual revision 017
Section 4: Mounting and Wiring System
SBE 33
30
Wiring System
On the ship, 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.
See
Cables and Wiring
in
Section 2: Description of SBE 33
for cable
diagrams. See
Connector Mating and Maintenance
in
Section 6: Routine
Maintenance
for connector mating details.
Water Sampler or PDIM to CTD
Connect the CTD’s data I/O connector to the Water Sampler’s CTD connector
using the cable supplied with the CTD / Water Sampler.
SBE 32 Carousel Water Sampler: the CTD connector is a 4-pin connector.
SBE 55 ECO Water Sampler: the CTD connector is a 6-pin connector.
(if using PDIM in place of Water Sampler) Connect the CTD’s data I/O
connector to the PDIM’s 4-pin connector using the cable supplied with the
CTD / PDIM.
Sea Cable from SBE 33 to Water Sampler or PDIM
Mold the bottom end of the sea cable to the 2-pin pigtail (RMG-2FS or
MCIL-2FS) supplied with the Water Sampler or PDIM. Connect positive
power (+, cable inner conductor) to the small pin (black on the pigtail) and
negative power (-, cable armor) to the large pin (white on the pigtail). If you
inadvertently connect the power with the wrong polarity, no damage will be
done, because there is a protective diode in series with the + power line.
However, the system will not work until the condition is corrected.
For safety
reasons and for the most reliable performance, Sea-Bird strongly
recommends use of the cable armor for the data and power return
.
Make a secure mechanical connection between the cable armor and the Water
Sampler lifting bail or (when used with the PDIM) the CTD cage lifting eye.
Connect the sea cable to the Water Sampler or PDIM electronics, using care to
dress the cable termination so that it will not be pinched by the shackle or
clevis. Install a cotter pin or seize the shackle securely.
Terminate the sea cable leads from the winch slip rings with the supplied 2-pin
connector (MS3106A12S-3P). Connect positive power (+, cable inner
conductor) to pin B and negative power (-, cable armor) to Pin A. Connect to
Sea Cable
on the SBE 33 back panel.
SBE 33 to Computer
SBE 33 communication with the computer is provided in two RS-232
channels. The
Carousel Data
channel sends commands to and receives replies
from the Water Sampler. The
Serial Data
channel sends commands to and
receives replies from the CTD (through the Water Sampler). Connect the
computer to
Carousel Data
and
Serial Data
on the SBE 33 back panel using
the supplied cables.
WARNING!
Life threatening voltage (+250 VDC)
is present on the sea cable when
the SBE 33 is powered. This voltage
persists for up to 1 minute after
removing power. Verify that the
SBE 33 is disconnected from the AC
power source before connecting the
sea cable to the SBE 33. Unplug the
AC power cord and wait 1 minute
after power is removed before
working on the SBE 33 sea cable
connector or sea cable circuits.
Note:
The CTD optical isolation feature
(SBE 25 - standard; SBE 19 - optional)
must be disabled when the CTD is
used with the Water Sampler:
1.
Open the CTD main housing.
2.
Solder a jumper wire across the
neon bulb on the
above board
.
See the CTD manual for details on
accessing the
above board
and for the
board schematic.
This note is not applicable to the
SBE 19
plus
, 19
plus
V2, 25
plus
, or 49.
Note:
When the SBE 33 is used with the
PDIM, the SBE 33
Carousel Data
channel is not connected to the
computer.
