How far can a sensor Target be away from the sensor Antenna?

For all Zettlex inductive encoder products, the air gap (axial separation of the target and antenna) is specified in the product datasheet. Generally, it is easiest to answer this question using a couple of examples:

In a rotary example, with an Antenna O.D. of 50 mm and an I.D. of 20 mm, then the equivalent Antenna width is 15 mm (the thickness of the annulus). The maximum working distance of the Target from the Antenna will be about half the effective Antenna width, 7.5 mm. We would normally recommend a stand-off distance of <1/4 Antenna width, about 3-4 mm.

Learn more about rotary inductive encoders here.

If we consider a linear Antenna 10 mm wide and 100 mm long in the measurement axis, then the maximum working distance of the Target from the Antenna will be about half the Antenna width, 5 mm. We normally recommend a stand-off distance of <1/4 Antenna width, about 2-3 mm.

Learn more about linear inductive encoders.