Echo Sounder
Supplied Transducer
WHAT THE REVIEWERS SAY
The Stingray standard was tesed by Motorboats Monthly. Technical Editor Mark Turley wrote 'Considering it is under half the price of any of the other units we looked at, it gave an extremely good account of itself, especially during the high speed runs'.
STINGRAY ECHO SOUNDER
STINGRAY STANDARD
This is the basic dual alarm, dual range unit with LED display only
STINGRAY TWIN
Dual alarm, dual range sounder with digital LCD depth readout in addition to the flashing LED display.
This is the basic dual alarm, dual range unit with LED display only
STINGRAY TWIN
Dual alarm, dual range sounder with digital LCD depth readout in addition to the flashing LED display.
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Description |
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The NASA Stingray Echo Sounders come in a slimline case with
an easy to read extra bright LED display on a 4 inch dial. They both have
dual audiblealarms for shallow and deep water which can be
set to give a reliable abchor watch. Both sounders can be set for two ranges
either 1-25 metres or 1-100 metres, and are simplicity itself to operate.
They come complete with transducer and stirup mounting brackets and only
require connection to the ships 12v power supply. HOW THEY WORK Very simply, they 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 Sounders 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. |
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Technical Specifications |
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