NSR22-BM-EX Belt Misalignment Switch

  • Cast Aluminum Body
  • It is resistant to blow and heavy conditions.
  • 2x50m Right and Left Rope Connection Distance
  • ATEX Certified for Dangerous Environment
  • IP68 Protection Class
  • It has CE and EAC Standards.
Get offer Share
NSR22-BM-EX Belt Misalignment Switch

NSR22-BM-EX Belt Misalignment Switches are designed to alarm and/or shut down a conveyor system in the event of belt drift and misalignment in hazardous environments where explosions could occur. They are mounted on both sides of the conveyor belt, with roller arm of the switch positioned 15 cm away from the belt. As the belt starts drifting into either side, it will first contact with the switch arm. Arm will roll without distrupting the belt. If belt continues to drift further the switch arm will rotate and actuate microswitches at specified angles.

The product is suitable for reliable long term usage in most industrial applications, thanks to its heavy-duty design. Its aluminium cast enclosure is resistant to corrosion and oxidation. Shaft and arm mechanisms are made of stainless steel and all internal parts are metal cast. NSR22-BM-EX series products do not require any maintenance.

With the single contact model, the system will stop when the switch arm rotates until 25°. With two contact model, the switch arm will actuate the alarm switch at 15° angle. Corrective action can be taken before further misalignment. If the belt drifts until the switch arm rotates until 35°, the second microswitch will be actuated and the system will stop. Contact structure can be customized.

NSR22-BM-EX is Ex-Proof (ATEX certified). With its protection against dust ingress, it is reliable in explosive athmosphere. All models conform to CE (European Union) and EAC (Eurasian Customs Union) standards. Microswitches used in these products are VDE approved.

For BMC (durable composite) enclosure option, please see our product TPR22-BM-EX

Technical Specifications

Enclosure Aluminium Casting
Micro Switch Rating 400 VAC 6A / 230 VAC 8A / 24 VDC 10A
Output Signal (1) SPDT shutdown, alarm can be added upon request.
Cable Gland 2 x M25
Temperature Rating -30°C to +85°C
Contact Angle 25°   Alarm Model: 15° and 35°
Contact Type Snap-action
Protection Class IP6X / IP68
Enclosure Color Black (RAL 9005)
Weight 3.9 Kg
Mounting Orientation It is suitable for double-sided use.
Impact Rating IK09 (EN 62262)
Warranty Period 36 Months

Safety Standards

Electrical Safety EN 60947
Mechanical Safety EN 60204
Outdoor Safety EN 60529
Impact Resistance EN 62262
Certificates CE, EAC
Micro switches are VDE approved.


Without Reset Lever
Bus Security Interface
Custom Contact Angles
Mounting Bracket
Custom Arm Dimensions

Ex Definition

II 2D Ex tb IIIC Db T85°C    IP66/68 

Model Specifications

Model Alarm Stop Reset
NC NO Angle NC NO Angle
NSR22-BM-EX       1 1 25° Available
NSR22-BM-A01-EX       1 1 25° -
NSR22-BM-A11-EX 1 1 15° 1 1 35° Available
NSR22-BM-A11B-EX 1 1 15° 1 1 35° -
NSR22-BM-22-EX       2 2 25° Available
NSR22-BM-A02-EX       2 2 25° -
NSR22-BM-33-EX       3 3 25° Available
NSR22-BM-A03-EX       3 3 25° -
NSR22-BM-A33-EX 1 1 15° 2 2 35° Available
NSR22-BM-A33B-EX 1 1 15° 2 2 35° -

Spare Parts

Model Features
KB-826-EX 1NO+1NC Switch
KB-R-01-EX M25x1,5 Cable Gland
KB-KT-01-EX  M25 Blind Plug
KB-4-KN-EX 4 Pin Connector
BA-11 Mounting Bracket (Can be made in custom dimensions)
KB-NGV-01 -EX Enclosure
TSR-42-BM-EX  Stainless Steel Roller Arm
KB-PM-EX Reset Lever