Sequoia LISST-200X, Руководство пользователя

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LISST-
200X User’s Manual
5 LISST-200X Introduction & Quick Start
Data Storage
and Interface The LISST-200X includes high-capacity data logging and storage. The
logging functions are programmed via the provided software. It can be
programmed with different start and stop conditions as well as different
sampling rates and average durations. The data logger stores the data
in non-volatile Compact Flash memory which can be later downloaded
and processed into size distributions and concentration using the
provided software.
The data logger will also accept commands via the RS232 interfaces.
These commands can be used to program the instrument or to
exchange data with another instrument.
Depth and
Temperature In addition to measuring the particle size and concentration, the LISST-
200X also has depth and temperature sensors. The depth sensor has
a 1000 psi full-scale range and is calibrated to 600 meters depth. A
stainless-steel fitting and tube filled with silicone oil protect the pressure
transducer from contamination and corrosion. The temperature is
measured using a high precision thermistor imbedded into a stainless
steel probe on the Connector end cap. Both values are stored
automatically in the LISST-200X data file.
External I/O Port The LISST-200X also has an auxiliary 6-pin connector for interfacing to
other devices This port can be configured to produce analog outputs, or
to receive analog inputs.
The Analog Output Configuration allows the LISST-200X to receive
power from a CTD, and to send two analog voltages indicating the
mean size and total concentration to the CTD, while the detailed size
distribution data is stored internally for later downloading. For more
details about this application, see Configuring the LISST-200X as a
Sensor for a CTD on 56.
The Analog Input Configuration enables operation with additional
sensors such as fluorometers and turbidity sensors. It provides 12V
regulated power, and accepts two or three analog inputs (0 to 5 V) from
sensors. The digitized analog values are stored in the same files as the
LISST-
200X’s particle size data. This configuration also supports the
instrument packages described in Appendix G: LISST-Black & LISST-
HAB on page 90.
Battery-powered
operation The LISST-200X does not contain internal batteries (except a small
battery to maintain the real-time clock), but can be powered from Small
or Large Battery Housings (provided with the instrument) or an external
instrument such as a CTD.
The standard Small Battery Housing supplied with the LISST-200X
uses two NiMH rechargeable D-cell batteries to provide about 12 hours
of continuous sampling.
The Large Battery Housing holds 16 standard alkaline D-cells. For
profiling applications, where the instrument is sampling continuously,
the Large Battery Housing has about 200 hours of sampling time or 200
days of stand-by. Powering down the instrument between samples can