NASA Stingray Echo Sounder come in a slimline case with an easy to read extra bright LED display on a 4 inch dial. It has dual audiblealarms for shallow and deep water which can be set to give a reliable abchor watch. The sounder can be set for two ranges either 1-25 metres or 1-100 metres, and are simplicity itself to operate. It come complete with transducer and stirup mounting brackets and only require connection to the ships 12v power supply.
HOW IT WORK
Very simply, it make a noise and measure the echo. Knowing that sound travels at 144 metres a second through watert allows us to calculate the depth by measuring the interval between the sound being made and the echo being heard. The NASA Stingray Echo Sounder have a transducer with a high quality Lead Zirconate Titanate Piezodisc crystal which creates ultrasonic 'sound' pulses at a frequency of 150kHz (imperceptible to the human ear). These pulses pass through the water and bounce back off the bottom. The returning echo pulse in then sensed by the tranducer crystal. On these rotary flashing LED type sounders, a pulse is generated as the LED flashes at the 12 o'clock position. The rotor arm is calibrated to run at a speed whereby when it flashes on receiving the returned pulse this flash will be in the correct position on the dial to indicate the correct depth.
Product No.: 10042
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