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.
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
| 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 |
Applications
- Intrusion detection at manholes and hatchways
- Handhold and vault access monitoring
- High EMI/RFI industrial environments
- Open-close sensing points in a network
- Go/no-go contact state monitoring
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