A bladder is installed inside the transducer so that the external surface of the bladder communicates with the inside of the transducer and the internal surface of the bladder communicates with the environment. The transducer internal passages (in communication with the external bladder surface) are filled with mineral oil. The internal passage of the bladder is exposed to the environment (water pressure) through a sealed passage in the transducer body.

The bladder expands and contracts with the increase and decrease in pressure, keeping zero pressure difference across the strain element. Thus, the design eliminates pressure-induced loads on the three forces and moments.

The transducer is calibrated after it is assembled and filled with mineral oil. All parts are stainless steel and rated for use in water. The connector is hermetically sealed and its metal jacket is stainless steel.

The base of the SF1.75D provides a flange with 4 x 0.256″ diameter counter-bored mounting thru-holes, suitable for 1/4-20 SHCS hardware. The base also has 4 x 0.251″ dia. holes for optional alignment pins. Base mounting features are located on a 2.5″ BCD (Bolt Circle Diameter). The top surface of the transducer provides 4 x 10-32 threaded mounting holes for load attachment and 4 x 0.189″ dia. holes for optional alignment pins. Both top surface feature are located on a 1.25″ BCD. Finally, the top surface has 4 notches that communicate the hydrostatic pressure of the submerged transducer with the internal bladder of the device.