Reed Relays and
Electronics India Limited
Manufacturer of Reed Switches, Reed Sensors and Reed-based products
Reed Relays and Electronics India Limited Incorporated in 1971
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Activation Distances for MS-228 Cylindrical Sensor

Operate and release distances for the MS-228 M8 threaded proximity sensor in the three standard AT bands when actuated (as shown in the sketches) with NdFeB standard magnets is shown below. All distances given are in mm with tolerances of ±0.5mm. Although some of the AT band / magnet combinations will produce similar actuating distances, selecting the right AT band and magnet for an application is important and can be done by going through our AT band FAQ and magnet selection guide.

MS-228-3 (20-25 AT) Tip to Tip Actuation

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
MS-228 actuation-magnet tip to sensor tip
NDR-T 4.0 x 1.5 x 1.5 N/A N/A
NDR-S 6.0 x 2.5 x 2.5 N/A N/A
NDR-M 8.0 x 3.0 x 3.0 3.0 – 5.0 7.0 – 8.0
NDR-I 12.0 x 3.5 x 3.5 6.0 – 8.0 11.0 – 12.0
NDR-L 19.0 x 4.0 x 4.0 9.0 – 12.0 15.0 – 16.0
NDC-T Φ2.0 x 4.0 N/A N/A
NDC-S Φ3.0 x 7.0 1.0 – 2.0 4.0 – 5.0
NDC-M Φ4.0 x 10 5.0 – 7.0 10.0 – 11.0
NDC-I Φ6.0 x 12.0 13.0 – 15.0 19.0 – 20.0
NDC-L Φ8.0 x 15.0 21.0 – 24.0 29.0 – 30.0

MS-228-4 (25-30 AT) Tip to Tip Actuation

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
alt=
NDR-T 4.0 x 1.5 x 1.5 N/A N/A
NDR-S 6.0 x 2.5 x 2.5 N/A N/A
NDR-M 8.0 x 3.0 x 3.0 1.5 – 3.0 6.0 – 7.0
NDR-I 12.0 x 3.5 x 3.5 4.5 – 6.0 10.0 – 11.0
NDR-L 19.0 x 4.0 x 4.0 8.0 – 9.0 14.0 – 15.0
NDC-T Φ2.0 x 4.0 N/A N/A
NDC-S Φ3.0 x 7.0 N/A N/A
NDC-M Φ4.0 x 10 3.5 – 5.0 8.0 – 10.0
NDC-I Φ6.0 x 12.0 11.0 – 13.0 18.0 – 19.0
NDC-L Φ8.0 x 15.0 19.0 – 21.0 27.0 – 29.0

MS-228-5 (30-35 AT) Tip to Tip Actuation

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
alt=
NDR-T 4.0 x 1.5 x 1.5 N/A N/A
NDR-S 6.0 x 2.5 x 2.5 N/A N/A
NDR-M 8.0 x 3.0 x 3.0 N/A N/A
NDR-I 12.0 x 3.5 x 3.5 3.0 – 4.5 10.0 – 11.0
NDR-L 19.0 x 4.0 x 4.0 6.0 – 8.0 14.0 – 16.0
NDC-T Φ2.0 x 4.0 N/A N/A
NDC-S Φ3.0 x 7.0 N/A N/A
NDC-M Φ4.0 x 10 2.0 – 3.5 9.0 – 10.0
NDC-I Φ6.0 x 12.0 9.0 – 11.0 18.0 – 20.0
NDC-L Φ8.0 x 15.0 16.0 – 19.0 26.0 – 28.0

MS-228-3 (20-25 AT) Parallel Actuation

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
MS-228 actuation-magnet parallel to sensor
NDR-T 4.0 x 1.5 x 1.5 N/A N/A
NDR-S 6.0 x 2.5 x 2.5 2.0 – 3.0 4.0 – 5.0
NDR-M 8.0 x 3.0 x 3.0 6.0 – 7.0 10.0 – 11.0
NDR-I 12.0 x 3.5 x 3.5 10.0 – 11.0 14.0 – 16.0
NDR-L 19.0 x 4.0 x 4.0 14.0 – 15.0 19.0 – 20.0
NDC-T Φ2.0 x 4.0 N/A N/A
NDC-S Φ3.0 x 7.0 4.0 – 5.0 6.0 – 7.0
NDC-M Φ4.0 x 10 9.0 – 10.0 13.0 – 14.0
NDC-I Φ6.0 x 12.0 16.0 – 17.0 21.0 – 22.0
NDC-L Φ8.0 x 15.0 23.0 – 25.0 29.0 – 30.0

MS-228-4 (25-30 AT) Parallel Actuation

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
MS-228 actuation-magnet parallel to sensor
NDR-T 4.0 x 1.5 x 1.5 N/A N/A
NDR-S 6.0 x 2.5 x 2.5 1.5 – 2.0 3.0 – 4.0
NDR-M 8.0 x 3.0 x 3.0 5.0 – 6.0 8.0 – 9.0
NDR-I 12.0 x 3.5 x 3.5 9.0 – 10.0 12.0 – 13.0
NDR-L 19.0 x 4.0 x 4.0 12.0 – 14.0 18.0 – 20.0
NDC-T Φ2.0 x 4.0 N/A N/A
NDC-S Φ3.0 x 7.0 3.0 – 4.0 6.0 – 7.0
NDC-M Φ4.0 x 10 8.0 – 9.0 11.0 – 12.0
NDC-I Φ6.0 x 12.0 14.0 – 16.0 20.0 – 21.0
NDC-L Φ8.0 x 15.0 20.0 – 23.0 28.0 – 29.0

MS-228-5 (30-35 AT) Parallel Actuation

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
MS-228 actuation-magnet parallel to sensor
NDR-T 4.0 x 1.5 x 1.5 N/A N/A
NDR-S 6.0 x 2.5 x 2.5 0.5 – 1.5 3.0 – 6.0
NDR-M 8.0 x 3.0 x 3.0 4.0 – 5.0 8.0 – 10.0
NDR-I 12.0 x 3.5 x 3.5 8.0 – 9.0 13.0 – 20.0
NDR-L 19.0 x 4.0 x 4.0 12.0 – 13.0 19.0 – 21.0
NDC-T Φ2.0 x 4.0 N/A N/A
NDC-S Φ3.0 x 7.0 2.0 – 3.0 6.0 – 9.0
NDC-M Φ4.0 x 10 7.0 – 8.0 12.0 – 16.0
NDC-I Φ6.0 x 12.0 13.0 – 14.0 20.0 – 24.0
NDC-L Φ8.0 x 15.0 19.0 – 20.0 27.0 – 28.0