In many branches of the process industries, fires and explosions can result from electrostatic discharge in hazardous areas. Even relatively small sparks have sufficient energy to ignite many flammable vapours, gases and even airborne dusts.
In situations, where this risk exists, static earthing (grounding) and bonding clamps are required wherever mobile or portable conductive plant items (such as drums and vessels etc) are used.
In these applications, it is necessary for the clamp to make a low resistance contact with the object, to enable any static to be safely dissipated to earth (ground) via a suitable conductor before the energy available for discharge builds up to dangerous levels.
If the correct clamp has been selected for the application and the object to be earthed does not have surface insulation then it should be possible to make good enough contact to prevent static accumulation.
However, in practice, many drums, containers and other equipment have coated surfaces (even when new). This problem is compounded in use owing to the build up of further insulating layers such as paint, resins, adhesives and other products inherent to the processing environment.
In tests many standard earthing clamps in use today show high resistance readings when clamped onto conductive objects with insulating surfaces. This may result in the clamp appearing to be physically attached, but not actually performing its intended function.
The design of the Bond-Rite clamp from Static Electricity Control provides enhanced safety and security by continuously testing the connection of the clamp to the container or other conductive item of plant and providing visual verification of this condition back to the operator.
In the configuration known as Ground Loop Monitoring (GLM), where two core grounding cables are used, there is the added benefit of also confirming the integrity of the cable and its connection to the earthing point or bus bar via the in-line quick-connect.
The Clamp Monitoring (CM) configuration, where single core grounding cables are used, monitors only back to the quick-connect but does ensure that this is correctly connected.
- Simple to operate
- Intrinsically safe
- Water and dust tight
- Stainless steel body
- Pulsing green LED indicator
- Tungsten carbide teeth
- Unique clamping action
- GB patent number 2369447
- Other patents pending