• The formula to convert accuracy and repeatability stated in ARCSECONDS, to accuracy in inches, at a specific radius is
• Example: A Camco 902 RDM has an accuracy of 69 ARCSECONDS. At a 12 inch radius, how accurate is it?

• 69 ARCSEC x 1 minute x 1 degree = 0.0192 degree:
• 60 SEC x 60 minutes
• 12 inches x 2 x 3.14159 = 0.2095 inches per degree
• 360 degrees
• 0.0192 degrees x 0.2095 inches per degree = 0.0041 inches
• Therefore, at a 12 inch radius, the CAMCO 900 RDM has an accuracy of 0.0041 inches.

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The rated operating distance specifications listed in most manufacturer's catalogs of inductive proximity sensors, do not necessarily state the actual operating distance you will get.

• The rated operating distance is based on standard targets of a specific size and material
• Material: Mild Steel
• Thickness: 0.04 Inch (1MM)
• Shape: Square
• Size: The length and width are equal to either:
1. The diameter of the circle inscribed on the active surface
   of the sensing face, or
2. Three times the rated operating distance, whichever is greater.
• The target approaches the sensor along the reference axis, from the front, not from the sides.
• Temperature fluctuations, voltage variations, and manufacturing tolerances can affect the operating distance by +/- 20% (0.8 - 1.2 x Rated Operating Distance)
• Therefore, the assured operating distance of any inductive proximity sensor is 0 - 80% of the Rated Operating Distance provided you are sensing a standard target!
• For typical non-standard targets, you must de-rate the sensors by the following factors:
• Aluminum (Solid) 0.35 to 0.5
• Aluminum (Foil) 1.00
• Brass 0.35 to 0.5
• Copper 0.25 to 0.45
• Lead 0.5 to 0.75
• Mercury 0.65 to 0.85
• Stainless Steel 0.6 to 1.00

or check out the patented UPROX sensor from the Turck.
It senses all types of Metals at the same distance.