Eddy-Current Sensors
Eddy-Current Sensor Probes
Ranges 
| Body Styles | Mounting Clearances | Operating Environment | Cables | Mechanical Details 
Probe model numbers are specified by their diameter and body style: i.e. a U8C probe has an 8mm diameter and a "C" body style.
Probes can be ordered as vacuum compatible.
Probe diameter determines the range.
Larger Diameter = Larger Range
Ranges for Standard Probe Diameters
The Range and Near Gap are directly proportional to the diameter of the probe: larger probes have larger Ranges and Near Gaps.
Probes are identified by their diameter - i.e. a U5 probe has a 5mm diameter etc.
Custom ranges are available.
Probe |
Range |
Near Gap |
||
| mm | inch | mm | inch |
|
U3 |
0.50 | 0.020 | 0.05 | 0.002 |
U5 |
1.25 | 0.050 | 0.25 | 0.010 |
U8 |
2.00 | 0.080 | 0.35 | 0.015 |
U12 |
3.50 | 0.140 | 0.60 | 0.025 |
U18 |
5.00 | 0.200 | 0.75 | 0.030 |
U25 |
8.00 | 0.320 | 1.25 | 0.050 |
U38 |
12.5 | 0.500 | 1.50 | 0.060 |
U50 |
15.0 | 0.600 | 2.00 | 0.080 |
Probe Body Styles
 |
 |
BStyle Probe |
CStyle Probe |
| Threaded body mounts with two nuts or threaded hole and one nut | Smooth steel body is clamp or set-screw mounted |
Mounting Clearances
To prevent mounting hardware or other metallic objects from interfering in precision measurements, eddy-current sensor probes must be mounted with the following clearances based on probe diameter X.
Standard Mounting |
Counterbore Mounting |
 |
 |
Probe Operating Environment
Probe Operating EnvironmentsStandard Probes come with PUR (Polyurethane) jacketed cables. High Temperature Probes have FEP jackets. Other temperature ranges may be possible. Contact us for more information. Standard Probes: IP67 High Temperature Probes: IP63 |
U3 Probe |
Standard Probe (PUR Cable): High Temperature Version Not Available |
| U5-18 Probes | Standard Probes: High Temperature Probes: |
|
| U25-50 Probes | Standard Probes: High Temperature Probes: |
Probe Cables
Standard probes have PUR (polyurethane) jackets. High-Temperature probes have FEP jackets. FEP cables can be custom ordered for standard temperature range probes.
More details on probe cabling are available in our Eddy-Current Probe Cabling Considerations TechNote.
