MODEL 408

These low profile thru-hull fittings can be obtained with a retractable or fixed transducer element.  The retractable model (shown at the right) is limited to 1.1" elements.  The fixed type can take up to 1.7" size.  Available in glass-filled nylon (408P) or bronze (408B).  A blank plug is furnished with the retractable type.

Specifiction Data Sheet - 408 Retractable

Specifiation Data Sheet - 408 Fixed       

Installation Instructions

Engineering Drawing

Options:

bulletTemperature sensor.

Weight:

bullet1.5 lbs. for 408P Model
bullet3.2 lbs. for 408B Model

Specifications:

FREQUENCY (kHz)

 BEAM WIDTH (degrees @ -3db)

ELEMENT SIZE (inches)

 ELEMENT SIZE (millimeters)

CAPACITANCE (pf)

NOTE (1)

IMPEDANCE (ohms)

NOTE (2)

TRANSMIT RESPONSE

(db)

NOTE (3)

RECEIVE RESPONSE

(-db)

NOTE (4)

POWER RATING, RMS (watts) 

REMARKS
200 18 1.1 28 965 550 157 -189 300  
200 12 1.45 37 1265 480 161 -182 300

408 Fixed only
200 11 1.7 43 1900 300 163 -185 600 Dual frequency, 200 & 50 kHz.  408 Fixed only
160 20 1.1 28 885 750 158 -189 300  
120 38 1.0 25 1050 500 167 -181 300  
50 45 1.7 43 1600 440 156 -173 600 Dual frequency, 200 & 50 kHz.  408 Fixed only

                                                                NOTES: (1)  with standard length cable.  (2)  equivalent series R in water.  (3)  the source level generated by one watt input.  (4)  the open circuit RMS voltage generated by a pressure of one microbar.

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