The Cetacean Research Technology  C55

The Cetacean Research C55 and C55RS models are preamplified, cylindrical hydrophones designed for the detection of infrasonic, audible, and ultrasonic sounds.
In addition to typical underwater use, these hydrophones can also be used for the detection of airborne and subterranean sounds and vibrations.  The C55 and C55RS hydrophones include an integral connector and are encapsulated in a very rugged polyurethane material. 
The hydrophones are not individually calibrated but calibrated frequency response measurements can be performed on request.

C55

Linear Frequency Range (±3dB) [kHz]: 0.016 to 44
Usable Frequency Range (+3/-20dB) [kHz]: 0.006 to 203
Transducer Sensitivity* [dB, re 1V/µPa]: -185
Preamplifier Gain [dB]: 20
Effective Sensitivity* [dB, re 1V/µPa]: -165
SPL Equiv. Self Noise at 1kHz [dB, re 1µPa]: 42 (< Sea State Zero)
Power Requirement [Vdc]: 5 to 32
RMS Overload Acoustic Pressure [dB, re 1µPa]: 169 to 186
Maximum Operating Depth ** [m]: 460
Operating Temperature Range [ºC]: -40 to 60
Output Impedance []: 2.5
Dimensions [mm]: 119 L x (25 to 16) dia.
Integral Connector ***: Subconn MCBH3MSS

The C55 hydrophone is a direct replacement for the C54XRS.
(2) The C55RS hydrophone is a direct replacement for the C54XR.
*  Transducer Sensitivity + Preamplifier Gain = Effective Sensitivity.
**  1,000 meter versions are available. Append "-1k" to the model number to order a hydrophone with a depth rating >1,000 meters.
*** Connectors are rated to a depth of 7,000 meters.

Shielded Cable Length [m]
• mating connector molded to 15, 30, or 50 [m] shielded cable
• other lengths available on a custom order basis
• cable includes Integral Connector rated to a depth of 7,000 meters.

Battery / Connector box
Battery boxes are rated NEMA-4X water resistant. Standard signal connection for the Cetacean Research C55 hydrophone is through a watertight female BNC connector. The hydrophones are powered by a single 9V battery (not included).
Signal Output: Female BNC connector
Battery Life [hours]: > 20
Box Dimensions [mm]: 98 long x 64 wide x 40 high
Directionality
• omnidirectional below 10kHz;
• very directional at high frequencies (e.g., ~15º solid angle at 200 kHz, -3dB);
• directionality focused in a plane.
Options
• removable in-line high-pass filter
• external power supply support
• custom orders not listed above


C55 product photo


C55 box


C55 frequency response


C55RS frequency response