In order to ensure laminar flow, the transducer face must be tilted slightly upwards in relation to the water flow. This allows the flowing water to meet the face directly, and reduces laminar noise.
The inclination angle must be determined carefully. The angle must be small on transducers with a narrow beam angles. As a rule of thumb, mount transducers with beam angles smaller than seven degrees with 1 ° inclination angle. The smaller beam angle your transducer has, the smaller the inclination angle can be.
NoteEnsure that you do not mount the transducer with a negative inclination angle. This may cause turbulence on the transducer face, and reduced ES18 performance.