Electrostatic Earthing

Electrostatic earthing systems reduce the risk of explosion of inflammable substances as a result of electrostatic flash-over. They are applied during transport and processing of inflammable gases, liquids and powders. Simple earthing systems consists of a conductor and an earthing clamp, more advanced ones have an earthing state control system that allows for transport/dosing of product only when the earthing has been properly connected. Earthing systems are usually applied for loading/unloading road and railway tankers, drums, tanks, big-bags, process plant elements, etc.

1. SIMPLE EARTH CLAMPS, CONDUCTORS AND REELS

  • Earth clamps are made of stainless steel and intended for single-core and multi-core conductors. They have sharp teeth made of tungsten carbide or stainless steel.
  • The clasps are perfect for rooms with tightened sterility requirements, as well as in areas where high corrosion resistance is required.
  • Such type clamps are available in two sizes: small clamps (12 cm) for operation in moderate conditions (e.g. earthing or connecting of small containers) and large clamps (27 cm) for operation in difficult conditions (e.g. earthing of large tanks, drums or IBC containers).
  • The clamp are ATEX certified: Ex II 1 GD T6.
  • ALS-10A type aviation clamp, with jaws of plated steel, is intended for connecting earth rods or aircraft undercarriage
    The clamp is made in conformity with U.S. military specifications: NSN#5999-00-134-5844 and MIL M83413/7-1.
  • Type C earth clamps of are applied for semi-durable connecting of such elements as drums with a storage rack or wherever a strong bolt connection is required. The clamps are made of galvanized steel (screw) and stainless steel. It is available in two sizes: 3/4″ and 2″.
  • Pipe clamp JR-150 in the form of a clamping ring provides a semi-durable earthing connection of various type elements of installations with conducting pipes. The clamp is made of bronze cast. It can be applied with pipes with the following diameters: 1/2”-3/4 ”, 2”, 3”, 4”, 6”
  • A screw clamp for operation in difficult conditions, for earthing barges, ships or railway wagons – wherever a strong screw clamp is required.
  • Earthing conductors are characterised by a very high mechanical resistance. They have a hytrel jacket resistant to chemical and mechanical factors, which allows for their application in difficult conditions occurring in many industries.
  • The conductors are available in the following versions:
    – Single-core straight earthing conductor, made of stainless steel, without a hytrel jacket, sold by the metre.
    – Single-core straight earthing conductor in a hytrel jacket, blue or green, sold by the metre.
    – Single-core coiled earthing conductor in a hytrel jacket, green, available in the following lengths: 3, 5, 10, 15 and 30 m (conductor length after extension).
    – Two-core coiled earthing conductor in a hytrel jacket, blue, available in the following lengths: 3, 5, 10, 15 and 30 m (conductor length after extension).

An alternative method for coiled or straight conductors is a reel for carrying away electrostatic charges. It is a very popular method ensuring a reliable connection between a ground bus and a container.

The reels are offered in different designs:

  • Metal, with a self-winding straight conductor of stainless steel in a transparent nylon jacket, 30.5 metre long, available in version with or without a conductor winding blockade.
  • Metal or stainless steel, with a self-winding straight conductor of stainless steel in a hytrel jacket, available in the following lengths: 6.1, 9.2 and 15.2 m
  • Metal, with a self-winding straight two-core conductor in a blue hytrel jacket, 15.2 m long.

2. CLAMPS WITH EARTHING CONTROL

The system ensures a visual control of the earthing condition through a diode mounted on the clasp. A blinking green diode indicates a proper hooking of the earthing clamp and a lack of damage to the conductor connecting the clasp with the hoop iron, whereas a red diode signals a negative result, i.e. a lack o earthing.

Bond-Rite CLAMP is an earthing control system mounted on a wall or another surface. It consist of a self-testing clamp with a coiled conductor 3 to 15 m long and a junction box with a bolt for hanging up the clamp.

Features:

  • Sharp teeth of the clasp allow for the clamp piercing through a layer of rust, paint, glue, resins and greases.
  • A quick-connect fitting enabling an easy disconnection of the clasp from the conductor for a battery replacement outside the explosion risk zone
  • A stainless steel clasp intended for operation in difficult corrosion conditions
  • A two-core conductor in a hytrel jacket (elastomer resistant to corrosive impact of chemical substances and mechanical damage)
  • It has a 9V lithium-magnesium battery for supplying the monitoring system (6 months of operation, 6 hours a day).

Bond-Rite EZ is an easy-to-use, portable set of clamps with a self-testing z clasp which quickly and safely verifies equalizer and earthing connections, e.g. during a transfer of inflammable products.

The system also ensures a visual control of the earthing condition through a diode mounted on the clasp. A green diode indicates a proper hooking of the earthing clamp, whereas the red one signals a lack of earthing.

Features:

  • The clasps are made of stainless steel, which allows for operation in difficult and corrosive conditions, they have also very sharp teeth that allow for piercing through a layer of rust, paint or glue
  • The clamps are interconnected with a two-core coiled conductor in a hytrel jacket resistant to chemical and mechanical factors, which makes it perfect for heavy-duty operation; the conductor is available in the following lengths 3, 5, 10, 15, 30 m (length after extension)
  • It has a 9V lithium-magnesium battery (6 months of operation, 6 hours a day).

3. EARTHING CONTROL SYSTEMS

The Earth-Rite RTR system is aimed at controlling earthing of road tankers; it also enables checking of earthing correctness during filling and emptying of road tankers.

The system operation is divided into individual stages. The first stage consists in checking the correctness of system connection to the tanker. Subsequently, the system checks whether or not the earthing (e.g. hoop iron) guarantees a quick and safe dispersion of electrostatic charges to the earth. The final stage consists in control of connection of the tanker with earth. In the event of a loss of connection, resulting e.g. from loosing of the clasp or damage to conductors, filling/emptying of the tanker will not be possible.

The system includes:

  • The earthing monitoring unit is made of aluminium alloy without a copper content.
  • The earthing controller is fitted with a diode light signalling system that indicates a proper earthing of the tanker.
    The red light means that the earthing has not been made properly and as a result, the system will not allow for commencing the loading/unloading process. The system also interrupts automatically the process when an improper earthing is detected.
  • Junction box made of glass reinforced plastic for hanging up the clamp
  • Double circuit stainless steel earthing clamp a for operation in difficult conditions, with two tungsten carbide teeth, connected with the system with a two-core coiled conductor in a hytrel jacket, resistant to chemical and mechanical factors. The cable outer diameter is 8 mm, whereas the conductor cross-section is 2×1 mm2.
  • Two voltage-free switches (possible automatic activation of pumps, valves, sound signalling, etc., after a positive verification of the earthing).

The Earth-Rite Plus railway tanker earthing control system ensures a safe earthing prior to commencement of loading and unloading of railway tankers. In the event of a loss of earthing, the system guarantees a proper blockade of loading equipment.

The system functioning is based on uninterrupted controlling of connection with the tanker. When the system indicates earth connection resistance higher than 10 Ohm, a medium transfer device (including pumps and valves) is activated. Otherwise, the system will be blocked until the condition is met.

The system is fitted with a diode light signalling system that indicates a proper earthing of the tanker. The earthing has not been made correctly when the red diode is on. In such a case, the system will not allow for continuing loading or unloading processes. Detection of improper earthing will result in an immediate interruption of the process.


The system includes:

  • The earthing monitoring unit is made of IP65 aluminium alloy without copper content
  • Stainless steel clamp for operation in difficult conditions, with two tungsten carbide teeth. It is connected with the system with a two-core coiled conductor in a hytrel jacket resistant to chemical and mechanical factors.
  • Junction box made of glass reinforced plastic for hanging up the clamp
  • Two voltage-free switches (possible automatic activation of pumps, valves, sound signalling, etc., after a positive verification of the earthing).

The Earth-Rite FIBC Static Earthing System is a hardware type revolutionary system designed to ensure safe filling and emptying type C Big-Bags.

Earth-Rite FIBC is configured so that the product transfer is allowed only when the system detects type C Big-Bags and when the active resistance of a FIBC container in relation to the earth is lower than 1×108 Ohm. When Earth-Rite FIBC confirms that active resistance to the earth is at a level between 500 and 1×108 Ohm (100 megaohm), including active resistance of the container, the system will allow for operation commencement.

Application / Operation principle

Earth-Rite FIBC is applied at emptying / filling different type C containers.
The monitoring clasp is almost completely insulated, except for a copper clamp. The clasp is connected to the lower earthing point of a FIBC container and thereby a connection is made which allows the system to monitor resistance of the FIBC to earth.
The clasp is connected to a coiled blue cable, 5 or 10 meters long, resistant to chemical factors and wearing.

Moreover, the system indicates earthing conditions through a green LED.

Earth-Rite FIBC has been designed to meet requirements of the pharmaceutical industry (the device is applicable in each industry).

The system includes:

  • A monitoring unit with a LED indicating a proper making of earthing and a bolt for hanging up the clamp,
  • An FIBC clamp designed for the best possible contact at type C Big-Bags or at liners carrying away static electricity without damaging the material.
  • The clasp is connected with the system by means of a two-core conductor in a protective hytrel jacket, 5 m long (the length after extending the coil; the hytrel jacket protects the conductor against mechanical or chemical damage).

The MULTIPOINT system is a device designed so that control simultaneously the earthing condition of as many as 8 installation elements. According to the guidelines of international standards for control of undesirable static discharges, earthing correctness will be confirmed by the system only when resistance of the earthing node at each channel is lower than 10 Ω.

The earthing correctness is verified by the monitoring unit that each of the elements connected to the system is fitted with. The lighting signalling system (green and red LED’s) indicates earthing correctness. If the earthing is improper, the system block the technological process.

For stopping the process conducted or switching off the sound signalling (in the event of a loss of earthing of any elements), a contact-less switch of the system can be used.
MULTIPOINT is conformable with the ATEX directive for application at dangerous sites; it also meets all current directives.

The OMEGA system allows for applying an electrostatic earthing monitoring as an element of larger process plant control systems. The plant can only be activated at resistance lower than 16 Ω, otherwise the system will not allow for bringing the plant into service. The system may be programmed in the range of 116 Ω.

The OMEGA system is designed for mounting on a bus (35 mm, standard DIN) in control panels. The system makes it possible to verify the resistance between two points, moreover. it offers functions of relay switch-over at the output at the value set by the user.

System application:

  • Monitoring of the temporary earthing condition of all movable conducting elements of the process plant;
  • Continuous monitoring of permanent plant elements in zones 0, 1, 2, 20, 21, 22;
  • Control of simple devices, such as float switches in dangerous areas.

The OMEGA system has been designed in conformity with requirements of ATEX, BS5958, CENELEC CLC/TR 50404 and other international standards.

Sole-Mate is a simple-to-use device intended for checking footwear or gloves for ability to carry away electrostatic electricity (anti-electrostatic properties) prior to the worker’s entering the threatened area (explosion risk atmosphere).

Sole-Mate is set so that to measure resistance in compliance with EN 20345 (lower and upper range) and calibrated in conformity with NAMAS standards.

The station is equipped with a diode light and sound signalling system indicating the possibility of entering an explosion risk area.

Operation principle:

Put on anti-electrostatic footwear (or anti-electrostatic wrappers on footwear), then stand with both feet on the measuring plate, push in and hold the silver button.

When the green LED is on, it means that the footwear resistance is below the upper standard limit and the footwear can be safely worn in a potentially explosive atmosphere, whereas the red lights indicates a negative result – after several seconds, a sonic alarm will sound. It means that the footwear resistance is above the upper standard limit. In such a case, the footwear cannot be worn in a potentially explosive atmosphere, which the respective superior should be notified of.

System components:

  • Control unit mounted on a wall
  • Well visible indicators and a penetrating sound alarm
  • Independent power source (a battery as part of equipment)
  • Battery discharge indicator

Are you interested in the above topics?

or send us your inquiry

Your Name (required)

Your Email (required)

Your Phone (required)

Company (required)

Subject

Your Message

Attach a file