FiberStrike LCM-600 Series Fiber Optic Interlock Switches (LCM-620)

Passive FBG open/close interlock switches for intrusion detection at access portals such as manholes, hatchways and handholes. Many switches network on a single fiber and report to a remote controller.

Technical overview

Each switch changes the strain state of an internal FBG between its open and closed positions, producing a 1 nm wavelength shift that the controller reads. Because sensing is entirely optical the switches need no power at the sensor location, tolerate high EMI/RFI industrial environments and can be sited tens of kilometres from the base unit over standard communication fiber. Standard center wavelengths run 1512 to 1588 nm in 4 nm intervals, with an extended 1460-1620 nm range available, allowing many uniquely addressed switches per strand. The housing is Zamak with a thermoplastic head and is rated IP66 for 1,000,000 mechanical cycles.

Sensing Routing

Features

Immunity to issues that plague electrical systems
Network multiple quantity of sensors on a single fiber
Monitor tens of kilometers from base unit
Suited to high EMI/RFI industrial environments
Dry contact (off grid) and software based system operation
FiberStrike actuator heads available for multiple applications
Passive - no need for electrical power at any sensor location

Specifications

Specifications
Parameter	Value
IP Rating	IP66
Housing Materials	Zamak with thermoplastic head, polyamide strain relief
Mechanical Life	1,000,000 cycles
Switching Principal	FBG strain state change
Max. Frequency of Operation	2 Hz
Mounting Type	Two 5mm holes on 41 mm centers mm
Sensitivity	1nm between open and close states nm
Accuracy	N/A
Temperature Range	-40 C to +80 C degC
Connection Type	Armored fiber pigtail
Reflectivity	>70 %
Wavelength Range	Standard: 1512 to 1588nm in 4nm intervals; extended range of 1460 to 1620nm is available nm