LISST-200X User’s Manual LISST-200X Introduction and Tutorial Page 5
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.
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
1
. The stainless steel fitting on the
Connector endcap is used for testing this sensor, and keeps
contamination such as salt and sediment out of the pressure sensor.
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.
The LISST-200X is also equipped with an external Auxiliary port which
is available via a 6-pin connector in the endcap. This port can be
configured in different ways by the user.
The Standard Configuration has one analog input and two digital
inputs. The analog voltage on this input is recorded with the size
distribution data. The digital inputs can be used to start and stop the
instrument.
The Analog Input Configuration has two analog inputs and switched
power which can be used to power the external sensor. Both analog
voltages are stored with every size distribution.
The Analog Output Configuration allows the Mean Size and Total
Concentration information to be output as analog voltages. The 6-pin
connector is wired to match the SeaBird CTD Auxiliary Input. This
allow the LISST-200X to obtain power from the CTD and output the
mean size and total concentration in real time to the CTD while the
detailed size distribution data is stored internally for later downloading.
The Auxiliary port can be reconfigured by the user by moving
mechanical jumpers on the main circuit board inside the instrument.
Contact Sequoia Scientific for instructions on how to access the jumper
on the circuit board.
A gauge pressure sensor is calibrated to measure the pressure relative to a given atmospheric pressure, as opposed to
an absolute pressure sensor, which measures pressure relative to a vacuum. The pressure sensor on the LISST-200X
will read 0 at atmospheric pressure.
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