Comprehensive Manual24
© 2018 Nortek AS
Because conversion from pressure to depth becomes quite complex as you move down below 500
m, we have included the full UNESCO calculations of depth as a function of pressure depth, salinity,
temperature.
Temperature Sensor
The temperature sensor is located inside the probe endbell. The temperature sensor provides data on
the water temperature, and is used for computing the Speed of Sound. Speed of sound can be set
by the user (Fixed) or calculated by the instrument based on the measured temperature and a user-
input value for salinity (Measured). The salinity is 0 for fresh water and typically 35 for the ocean.
The temperature sensor samples at 1 Hz.
Tilt Sensor
The tilt sensor is mounted on a small round PCB board attached to the probe. It is normally aligned
parallel to the axis of pressure case axis for vertical operation. It can, however, optionally be installed
perpendicular to the pressure case axis for operation with the pressure case horizontal.
The tilt sensor works equally well with the instrument pointed up or down. Note that when using the
Vector in Continuous mode, only the very first measurement includes orientation information. If the
Vector is oriented the opposite way during continuous data collection, the tilt sensor will not detect
the change.
Tilt data is sampled at 1 Hz. The measurement range is +/- 30 degrees.
Is there uncertainty about whether the Vector has a vertical or horizontal tilt sensor? If the tilt (pitch
and/or roll) as indicated in the Sensors’ pane is unrealistically far from 0° when placing the canister
(upright or lying down) on a table, the Vector is of the other type.
Compass
The compass is located inside the pressure case, and measures the earth’s magnetic field.
Combined with the tilt sensor on the head, the compass enables the Vector to obtain the heading.
Without a compass, the Vector can still measure tilt. The compass enables the Vector to convert
velocity measurements to Earth (ENU) coordinates.
Compass data is sampled at 1 Hz.
IMU sensor (Optional)
Nortek offers the Vector with an integrated Inertial Motion Unit (IMU). The IMU sensor is an electronic
device that replaces the Compass board on the standard Vector. This sensor measure acceleration,
angular rate and magnetic field along three axes. It is a valuable data source for applications where
the instrument moves. Using an IMU with the Vector allows one to basically record motion data
simultaneously with Vector velocity data. IMU data is sampled at the same rate as velocity. Note
that there is no advanced internal processing.
Electronics Module
The electronics module is located inside the pressure case, and is a single board that holds the
power transmitter, analogue and digital signal processing, power conditioning and the standard data
recorder.
Power & Communication Cable
The power and communication cable is mounted to the endbell connector. The cable supplies
external DC power and connects an external computer to the Vector for 2-way serial communication.
Cable Wiring is presented here: Cable Wiring. The Vector comes standard with an 8-conductor
connector and cable.
External power
To Next Page
Loading...
