User`s manual

Section 6: Configure Outputs
66
SBE 14 Remote Display
The SBE 14 Remote Display can display depth, pressure, and/or altimeter
height for a CTD system, and can be set up to turn on an alarm based on
minimum and maximum pressures, an altimeter integrated with the CTD,
and/or a bottom contact switch integrated with the CTD.
To enable and set up the SBE 14, click Configure Outputs. In the Configure
Outputs dialog box, click the SBE 14 Remote Display tab:
Make the desired selections. Click OK or click another tab in Configure Outputs.
Notes:
• SBE 14 setup in SEASAVE applies if
SBE 14 is connected to a COM
port. If the SBE 14 is connected to
an 11plus Deck Unit, SBE 14 setup
is done by sending commands to the
11plus in SEATERM.
• Altimeter alarm is available only if
selected configuration (.con) file has
a CTD with altimeter.
• Bottom contact switch alarm -
SBE 9plus: Always available.
All other CTDs: Available only if
selected configuration (.con) file has
a CTD with bottom contact switch.
Sea Surface
Altimeter alarm not on, regardless of altimeter reading
Minimum pressure (db) to enable altimeter alarm
Atimeter alarm hysteresis (m) – altimeter alarm
stays on in this range after set point reached
Sea Bottom
Altimeter alarm on when altimeter in this range
Altimeter alarm
set point (m)
Alarm on when pressure in this range
Minimum
pressure alarm
Alarm on when pressure in this range
Maximum
pressure alarm
Affects SEASAVE’s depth calculation:
• Salt water – Algorithm estimates local
gravity from latitude from NMEA navigation
device (if NMEA enabled in .con file). If
system does not have NMEA, enter latitude
on Miscellaneous tab in Configure Inputs.
• Fresh water – Algorithm ignores gravity
variation with latitude, because fresh water
applications are usually shallow, and effect
of gravity variation is insignificant.
Enable sending data to SBE 14, using serial port defined on Serial Ports tab.
Updates at very fast rate make display hard to
read. Also, time between updates interacts
with data output baud (set in SBE 14 to 300
baud; cannot be changed) and number of
variables transmitted. SEASAVE will not work
properly if data is presented to COM port
faster than port can transmit it to SBE 14.
Select converted data to display:
• Altimeter Height (3 digits)
• Depth (4 digits)
• Pressure (4 digits)
• Altimeter Height + Depth - altimeter height
and depth alternate on display
• Altimeter Height + Pressure - altimeter
height and pressure alternate on display
Note: Altimeter height available only if
altimeter included in configuration (.con) file.
Enable minimum / maximum pressure alarm
in SBE 14; see drawing below.
Enable altimeter alarm in SBE 14. Set Alarm
set point at altimeter reading where you want
alarm to sound. Set Alarm hysteresis greater
than expected ship heave (swell) to prevent
on-off-on-off sounding of alarm caused by ship
heave. See drawing below.
Example: You want alarm to turn on at 10 m;
set set point = 10 m. There is a 0.5 m swell;
set hysteresis = 1 m, which should be
sufficient to account for possible 0.5 m upward
movement due to ship heave. Alarm sounds at
10 m above sea bottom and stays on until
altimeter goes above 11 m, when it shuts off
until it falls to 10 m again.
Enable bottom contact switch alarm in SBE 14.
Set Minimum pressure to enable alarm
greater than approximately 20 db to
prevent alarm from turning on while CTD
is on ship deck or as it is entering water
(when altimeter is measuring distance to
deck or to top of water surface).