GROUNDING-TESTER SERIES EK*-3

General instructions       When loading fuels or other non-conducting hydrocarbons into or from fuel-carrying vehicles, it is absolutely necessary to ground trucks and wagons in a safe way to divert electrostatic charges and to prevent a possible generation of sparks that may cause an explosion.    The TERRAMAT-series of electronic grounding-testers were developed for controlled grounding of tank-trucks, tank-wagons, ships and aeroplanes during loading and fuelling.

Safety norms

   This explosion protected electrical apparatus meets the requirements of the European Standards EN 50014 ff. As an electrical apparatus of category II 2G in accordance with EN 50014/A1 it is suitable for use in zone 1 hazardous areas.
   Explosion category: EEx eq [ib] IIB T4.

Grounding tester general diagram

The TERRAMAT-series EK*- 3

The TERRAMAT-series of electronic grounding-testers named EK*-3 actually contain four different versions:

 The grounding-testers, types EKN-3, EKK-3 and EKS-3, are build similarly. The only difference
is that their oscillators are suited to the special range of application. The grounding-tester, type EKT-3, which has no internal oscillator, is a special version that co-operates with an external oscillator:

 All types have certain features in common that are described below:

• Explosion protection in accordance with European Standards EN 50014ff. and in conformity with the E.C. directive 94/9/E.E.C.
• Various power supply by 24 V AC, 115 V AV, 230 V AC and 24 V DC.
• Water jet protected aluminium housing (protection class IP 65).
• Two potential-free change over contacts and one NAMUR-compatible, potential-free
  Ex-i-contact for the connection of certified intrinsically safe circuits of explosion category EEx ia/ib IIB/IIC for external control procedures.
• A two-coloured lamp (red/green) for status-indication.
• The oscillator operates as an ohm-capacitive level-detector and detects the resistance of the grounding-loop.
• The oscillator is supplied with an intrinsically safe electric current. The limit values may be set when the unit is energised, even during operation of the equipment.
• The individual modules are encapsulated to be well-protected from adverse environmental exposures. In case of wear or failure, the modular units can be easily replaced.

Cable-reel KA type      The cable-reel for the grounding tester is springactuated and designed without sliprings. The grounding cable is not interrupted all the way down from the grounding tester to the grounding clamp. It runs neither over contacts nor sliprings. The process of winding is actuated by a coil spring connected with the winding arm that rotates around the fixed drum. A pawl enables that the cable can be handled without strain.    The cable-reel is designed in conformity with the E.C. directive 98/37/EC, appendix II A, relating to the safety of machinery.