During product delivery, tank cleaning or spill recovery operations, merely grounding the transporting vehicle may not be enough. Static electricity can still accumulate to dangerous levels in isolated metal components of commonly used helix-wire transfer hoses. The new OhmGuard Hose-Continuity Tester from Newson Gale, is designed to continuously ensure that a string of assembled hoses are safely grounded to the transferring vehicle during operations that may produce potentially combustible gas, vapor or dust atmospheres. In practice, the new instrument operates as a simple straight-forward “pass or fail” test. The operator will first securely ground the vehicle and then assemble and connect the required number of hose sections.
The OhmGuard tester is then attached to the free coupling or nozzle of the last hose connection and to a confirmed grounding point on the vehicle. If the total electrical resistance through the string of hoses is below the accepted standard of 100 ohms for multi-segment hoses, a green LED mounted on the OhmGuard clamp will pulse continuously. If there is a break in the continuity the pulsing will cease, warning the operator of the danger. The new instrument is North American (cCSAus) certified in classes I, II and III. Ingress protection is rated IP65, providing total protection against dust and low-pressure water jets. Models are available with either 32 ft (10 m) or 50 ft (15 m) Hytrel 2 core spiral cable, with either an LED indicator clamp or optional permanent junction box.