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NASA Stingray Twin
Dual alarm, dual range sounder with digital LCD depth readout in addition to the flashing LED display.
Features:
Comes in a slimline case with easy to read extra bright LED display on a 4 inch dial. It has a dual audible alarm for shallow and deep water which can be set to give a reliable anchor watch.
Can be set for two ranges either 1-25 metres or 1-100 metres. Comes complete with transducer and stirrup mounting bracket 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 water 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 150 kHz (imperceptible to the human ear). These pulses pass through the water and bounce back off the bottom. The returning echo pulse is then sensed by the transducer 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 diel to indicate the correct depth.
Technical Data:
Weight: (including Tranducer): 1Kg
Supply Voltage: Nominal 12v DC
Power Consumption: Nominal 120mA
Power Output: 100w + Pulse
Transducer: Lead Zirconate Titanate Piezodisc with 7 metres of cable
Operating Frequency: Nominal 150 kHz
Oscillation Rate:
Range A, 0-25 37.5 pulses for sec
Range B, 0-100 7.5 pulses for sec
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