A sensor used to monitor a counterweight attached to the slow speed line of a travelling block. When the block makes contact with the counterweight, the A2B sensor sends an alarm signal to a central display panel.

Anti-Two-Block Specifications

*Information subject to change without notice. Consult the factory for the most current data and part numbers.*

Operating Time
100% (Continuous duty)
Voltage Type
Powered by a 3.6 volt D cell lithium battery
Operating Temperature
-40°C to +60°C
Operating Frequency Range
900-928 MHz in North America
868-870 MHz in Europe
Body material –Ultramid 8333G Hi-Polyamide 6
Seals – ROHS compliant silicon rubber, 60 durometer shore-A, compound # SIM40160
No connection, component provides a wireless signal
Mounting Options
A variety of custom-fit welds, clamps, or brackets available. All three options provide secondary containment.
Hazardous Locations
Exia IIB T4 Intrinsically Safe per IEC CAN/CSA E60079-11:02

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