Model 4100/4100R - Doppler Current Sensor
A rugged, true vector averaging sensor for measuring current speed and direction in the sea. 4100 model: SR10 output for AADI dataloggers 4100R model: RS232 output for third party dataloggers.
The DCS 4100/4100R is intended for commercial reasons as well as for research purposes. It can be used to monitor the water current in harbors, along the coast, near offshore oil platforms etc. The In-line Doppler Current Sensor DCS 4100/4100R is a rugged and reliable sensor that offers users great flexibility to obtain accurate current measurements.
The sensor uses the Doppler Shift principle as the basis for its measurements. Four transducers transmit short pulses (pings) of acoustic energy along narrow beams. The same transducers receive backscattered signals from scatteres that are present in the beams (0.4 to 2.2m from the sensor), which are used for calculation of the current speed and direction.
The scattering particles are normally plankton, gas bubbles, organisms and particles stemming from man-made activity.
After reading the internal compass circuit (Hall effect compass), the sensor is able to determine the current speed and direction. The sensor will ping towards the water current. The current measurements are compensated for tilt by the use of an electrolytic tilt sensor.
The measurement accuracy is proportional to the square root of the number of pings in a measuring interval. To obtain good accuracy at short intervals e.g. 1 minute, it is possible to choose a higher ping rate. The current consumption will, however, also be greater with increasing ping rates.
The temperature is measured using a temperature dependent crystal-oscillator-circuit.
The DCS 4100R can output data using the RS232 standard; output parameters are set up using the 4042 setup program. The sensor can be set up to output data automatically (nonpolled) or only when polled via the RS232 line.
Various system parameters can be altered using the RS232 command system. DCS4100R can be set to 4 modes: Normal, comprehensive, high speed and 3500. In 3500 compatible mode, it will act as the former version of this sensor, the DCS3500R.
The DCS4100 outputs SR10 data.
- Rugged and Reliable DCS with High Accuracy
- Insensitive to fouling
- Ideal for use on buoys, quays, piers, and in hand for in situ measurements
- Function test is easy carried out with our Test Unit 3731
- Up to 4 DCS can be connected in a string using AADI cables
- Ping rates 4100R: selectable from 4 to 1200 pings per minute
4100: Intervals of 2min or less: 10pings/s
Intervals greater than 2min: 1ping/s
- RS-232 communication
- Customizable through RS-232 communication
- Can operate in both polled and non-polled mode
- In high speed mode the DCS 4100R can output ping data 4 times a second