The SOLDO BM and TB Series Proximity Switches, provides a compact design and a cost saving solution for remote valve position feedback in both linear and rotary applications, as well as general purpose feedback in explosive atmosphere or subsea environments.

The rugged design and ease installation system, provide maximum application versatility. TB series is the conjunction of a BM bolt switch with an aluminum or stainless steel junction box, to allow a direct local wire connection.

BM switch utilize industrial standard 5/8"-18 UNF or M16 x 1.5 threads and each switch is provided with two heavy-duty jam nuts. BM switches can be mounted with standard brackets or customized ones to suit specific applications. TB series uses the same BM head mounting pattern with the availability of a junction box screw bottom mounting system.


  • Compact Position Indication on Linear Valve
  • Adaptable Solution to Multiple Applications
  • 316 Stainless Steel Rugged BM Enclosure
  • 450 mm of Flying Leads on the BM Series for Wiring Purposes
  • 316 Stainless Steel or Aluminum Junction Box on the TB Series
  • Magnetic or Ferrous Sensing Target Capabilities
The above description encapsulates the entire product series. Specifications for individual configurations may vary depending on the selection chosen.

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Agency Approvals

  • ATEX Ex II 2GD, Ex d IIC T6/T5/T4 Gb, Ex tb IIIC T80° C/T95° C/T115° C Db
  • CE
  • cULus Class 1/2 Division 1, Class 1/2 Division 2
  • EAC Ex II 2GD, Ex d IIC T6/T5/T4 Gb, Ex tb IIIC T80°C/T95°C/T115°C Db
  • IEC Ex: Ex II 2GD, Ex d IIC T6/T5/T4 Gb, Ex tb IIIC T80° C/T95° C/T115° C Db
  • INMETRO Ex II 2GD, Ex d IIC T6/T5/T4 Gb, Ex tb IIIC T80° C/T95° C/T115° C Db
  • SIL 3
  • UL Class I, Division 1 and 2, Groups A, B, C and D, Class II, Division 1 Groups E, F and G, Class II Division 2, Groups F and G

Environmental Protection

  • IP66
  • IP67
  • IP68
  • NEMA 4X
  • NEMA 4X
  • Weatherproof Limit Switch Box

Temperature Range

  • -50° to 105° C (-58° to 221° F) - Nova V3 N1 Ferrous and Magnetic Target Switch
  • -60° to 105° C (-76° to 221° F) - Reed C4 Magnetic Target Switch

Ambient Temperature

  • -40° to 80° C (-40° to 176° F)

Switch Quantity

  • 0.125” (3.175 mm)

Response Time

  • <1 Millisecond - Operation in Frequency (10÷30 Hz) for Switch BMN1
  • <2 Milliseconds - Single Operation for Switch BMN1
  • 2 Milliseconds - For Switch BMC4

Process Connection - Threaded

  • M16 x 1.5 Male
  • 5/8"-18 Male UNF


  • Inert Gas Contact Chamber

Switch Type

  • Proximity
  • SPDT: Magnetic Hermetically Sealed Switch

Cable Length

  • Up to 131.2 feet (40 meters) - For Subsea Cable With Fast Connector

Cable Entry

  • 1/2" NPT
  • M20 x 1.5

Electrical Rating

  • 1 A at 24 Vdc - For Reed C4
  • 5 A at 250 Vac - For NOVA V3 N1
  • 5 A at 28 Vdc - For NOVA V3 N1


  • 100 Hz Maximum - For Switch BMC4
  • 30 Hz Maximum - For Switch BMN1

Electrical Contacts

  • Silver-Plated Snap Acting Contacts

Electrical Connectors

  • Flying Leads of 17.72 Inches (450 mm)


  • No Visual Position Indicator

Enclosure/Body Material

  • 316 Stainless Steel - Junction Box

Enclosure Finish

  • Black Polyester Powder Coated - For Aluminium TB Series
  • Electropolishing - For Stainless Steel TB Series

Materials of Construction

  • Aluminum - Junction Box