FAQ

Q1: What kind of gap/measurement range does this probe support?
A: The listing gives a calibrated range of ~80 mils (2.0 mm) with starting point ~10 mils (0.25 mm) from the tip face. In practice, the eddy‑current probe will have its most linear range when the tip‐to‐target gap is within the recommended range. For the 8 mm Bently series, typical recommended gap

is in the few tens of microns to a couple of mm, depending on the target geometry and electronics. Always consult the

specific data sheet for your system.

Q2: What target material and shape should be used with this probe?
A: The system is based on eddy‐current sensing: a conductive (typically steel) target whose distance to the probe tip changes. While I

 don’t have the full Bently datasheet for this exact variant, similar probes require a flat or cylindrical conductive surface of

sufficient size (to fill the probe’s magnetic field) and a consistent finish (no heavy rust, pits, or debris). The more the

target matches the conditions under which the probe was calibrated, the better the accuracy and linearity. If you

deviate (smaller target, different alloy, non‑flat surface), expect possible measurement errors.

Q3: What is the supply voltage / electrical spec for this probe?
A: While I did not find a full published spec for exactly “21504‑00‑08‑10‑02”, similar listings suggest: “Input power:

 ‑17.5 Vdc to ‑26 Vdc at 12 mA Max consumption.” For example one listing says: “Lead Armor: No … Input

 power: ‑17.5 Vdc to ‑26 Vdc at 12 mA Max consumption.” You’ll need to check the matched

proximitor sensor’s specification in your system to

onfirm compatibility.