Table of Contents
Advertisement
d) Salinity should be specified or determined
using a CTD instrument as accurately as
possible for each measurement location. The
CastAway-CTD is a lightweight, easy to use
instrument designed for quick and accurate
conductivity, temperature, and depth profiles.
Starting with a unique six-electrode
conductivity cell and fast response thermistor
the CastAway makes use of modern
technology to provide state of the art CTD
measurements.
e) Sound speed is used in Doppler velocity calculations. See the
Operations
for details about the effect of sound speed on velocity data.
f) To change the Salinity,
i). Use the backspace key to clear current entry,
ii). Type in the new value using the keypad.
3.4.2.3
Temperature
The Temperature parameter specifies the temperature value used to compute sound
speed.
a) The temperature value used to compute sound speed is based on internal
temperature sensor by default. The temperature field will be populated with the
value "Measured" to indicate it is based on internal temperature sensor.
b) Water temperature measured by external devices can be entered in the
temperature field. The temperature value from the external sensor will then be
used for sound speed calculations.
The temperature field cannot be used to store reference temperature readings as this
will be used in the sound speed calculations. It is recommended that reference
temperature readings be documented in the comments fields.
c) Sound speed is used in Doppler velocity calculations. See the
Operations
for details about the effect of sound speed on velocity data.
d) Enter external temperature reading,
i). If the default value "Measured" is displayed, start typing using keypad, otherwise,
ii). Use the backspace key to clear current entry,
iii). Type in the new value using the keypad.
3.4.2.4
Sound Speed
The Sound Speed parameter specifies the sound speed value used in Doppler velocity
calculations.
FlowTracker2 User's Manual (January 2019)
Figure 3:12 - CastAway - CTD
45
SonTek – a Xylem brand
Principle of
Principle of
Advertisement
Table of Contents
