Simrad 27-26/21, Datasheet, Page: 1 / 2

TRANSDUCER
Simrad 27-26/21
27 kHz Dual-beam transducer
(855-160793 Rev
.D)
Introduction
The 27-26/21 is a dual-beam transducer incorporat-
ing 45 Tonpilz elements. The narrow and wide beams
employ 45 and 21 elements respectively. The trans-
ducer’s housing is made of berglass reinforced poly-
ester (GRP) and is designed for installation in a steel
blister.
Order number
KSV-067159
Technical specications
Resonant frequency.........................................27 kHz
Longitudinal beamwidth:
Narrow beam.........................................10 ±1 deg
Wide beam.............................................10 ±1 deg
Transversal beamwidth:
Narrow beam.........................................11 ±2 deg
Wide beam.............................................20 ±4 deg
Directivity index:
Narrow beam............................................25.5 dB
Wide beam................................................20.5 dB
Equivalent two-way beam angle Ψ:
Narrow beam...........................................-18.0 dB
Wide beam...............................................-13.0 dB
relative to 1 steradian
Nominal impedance ....................................... 60 ohm
Maximum variation in |Z| .................... 45 to 80 ohm
Maximum variation in phase angle ..............±30 deg
Transmitting response:
Narrow beam..............177.0 ±2 dB re 1μPa per V
Wide beam..................171.5 ±2 dB re 1μPa per V
Receiving sensitivity, open circuit:
Narrow beam............ -1 70.0 ±2 dB re 1V per μPa
Wide beam................ -1 75.5 ±2 dB re 1V per μPa
Electro-acoustic efciency:
Typical............................................................0.70
Minimum........................................................0.50
Maximum input power:
Narrow beam............................................3000 W
Wide beam................................................1500 W
Maximum duty cycle at max power.....................0.05
Maximum transducer depth ............................. 500 m
Cable length ....................................................... 25 m
Cable diameter .................................... 12.5 ±0.8 mm
Weight without cable .........................................35 kg
Storage temperature .............................. -20° to 70°C