Earthing Relays

The Earthing Relay Model ERX-710 is an Intrinsically Safe field-protection device used in Vehicle Static Grounding Systems. It provides the operator with absolute confirmation that the Vehicle is properly earthed and is consequently safe for loading or unloading operations. The instrument thus ensures safety during the loading and handling of volatile chemicals or inflammable liquids at truck, rail and aircraft refueling terminals.

Transport Vehicles, particularly of inflammable, explosive or sensitive material should be necessarily grounded before, as well as during, any loading or unloading operation. One of the primary causes of fire and explosions during such operations is the danger of accidental sparking which may be caused by the generation of a high static-charge on the body surface or chassis of the vehicle. Since the tyres of the vehicle are made of a non-conductive material, there is no path available for the discharge of this developed static-charge. On entry at the loading / unloading terminal, the Tanker is first earthed to the “true-Earth” (Ground) point by means of a Clamp Probe and the static-charge is dissipated. Even a low level residual static-charge could result in minor sparking on contact with any metallic dispensing hose or valve, which could spell disastrous repercussions in a hazardous area. The Earthing Relay ensures that this residual charge is dissipated through an internal shunt route, and then re-checks to ensure ground potential of the truck body.

The instrument has been tested and certified for Intrinsic Safety by The Central Mining Research Institute (CMRI) at Dhanbad for suitability of operation in Gas Groups IIA and IIB. The Earthing Relay Card itself is housed in an explosion-proof enclosure, which is certified for operation in Gas groups II-A and II-B by CMRI Dhanbad and CCOE, Nagpur.

All ASHE instruments carry a lifetime warranty against defects in components and workmanship.

SPS-600 Earthing Relay

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Usage/Application	VEHICLE STATIC GROUNDING SYSTEM
Model Name/Number	SPS-600

The Vehicle Static Grounding Relay SPS-600 is an advanced protection system that provides safeand secure grounding of static charge to Earth in hazardous area applications during tankerloading and unloading operations. The instrument is a certified intrinsically safe product mountedin an explosion-proof enclosure. The instrument detects the presence of a Tanker vehicle andinterlocks the loading and unloading operations allowing the process to initiate only aftersatisfactory grounding of the Tanker body or Loading Arm and healthy physical condition of theinterconnecting Cables. The charge is thus safely dissipated to earth via a low impedance paththrough an intrinsically safe module housed in a flameproof enclosure in the vicinity of theoperation.

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SGR-250 Earthing Relay (Vehicle Static Grounding System)

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Material	Aluminium
Usage/Application	Industrial
Finishing	Brass
Brand	Ashe Controls Pvt. Ltd.
Country of Origin	Made in India
Phase	Single
Stereo Microscope Type	Earthing

Static Electricity is a phenomenon of electrification of objects through continuous physical contact and separation and the various effects that result from the positive and negative charges so formed. In industrial processes where there is any form of physical movement, the separation of materials generates a high degree of static charge. If the object or container is insulated from earth, this charge will start to accumulate and can reach dangerous levels, sometimes in excess of 30 kV. Non-conducting materials like rubber tyres in vehicles, paints, gaskets and seals provide insulation to this charge and prevent safe static dissipation.

During the process of loading or unloading fuels or any inflammable, explosive or hazardous chemicals in transport vehicles such as Tankers and Railway Tank Wagons, it is therefore essential to ground the vehicles or wagons in a safe manner before commencement of the loading/ unloading operation. This is required to divert the surface residual electrostatic charges to ground so as to prevent a possible generation of sparks between the vehicle and any proximal metallic objects. Since the tyres of vehicles are non-conductive, there is no path available for the discharge of this developed static-charge.

The Static Grounding System Model SGR-250 provides safe and secure grounding of dangerous static charge to earth in hazardous area installations, thereby ensuring safety to plant and personnel.

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Static Charge Grounding Relay (Earthing Relay - Tanker Loading)

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Brand	ASHE
Type	Tanker Earthing
Country of Origin	Made in India
Ground Impedance	1 to 10 Ohms (internally settable)
Power Supply	230 VAC, 50 Hz (+/- 20%) AC
Ingress Protection	IP65
Dimensions	170 x 325 x 250 mm
Max Ambient Temperature	50 deg C

The Static Charge Grounding Systems, Series ERX and SGR, provides safe and secure grounding of dangerous static charge to earth during loading or unloading operations in hazardous area applications, ensuring safety to plant and personnel. The instruments are certified intrinsically safe products offered in explosion-proof execution, providing a high degree of protection against fires or explosions caused by sparking.

The instrument acts as an interlock during loading and unloading operations, allowing the process to resume only after satisfactory grounding of static charge on the Tanker body or Loading Arm. The Earthing Relay's primary function is to determine whether the Tank Trucks at the loading terminals are properly earthed and thereafter, provide a visual indication and a control signal for process resumption. The Earthing Relay senses the static-charge potential of the Tanker and provides a safe grounding path for this charge through a low impedance and intrinsically safe electronic module, which is itself housed in an explosion proof enclosure mounted near the loading terminal. The Earthing Relay Series ERX & SGR are certified for intrinsic safety (Ex-i) and the enclosures for explosion-proof (Ex-d) operations by CIMFR. The instrument is housed in a certified cast Aluminum Alloy LM6 enclosure and offered with a standard 5-metre Cable-Clamp assembly. All ASHE range of instruments carry a lifetime warranty for design and workmanship.

Features:

Microcontroller based design
Intrinsically-Safe Ex-i certified
Explosion-proof Ex-d certified
Low cost, high functionality
Impedance based control action.
Intelligent monitoring of critical parameters
Dual Relay change-over contacts
Very low power consumption and heat dissipation
Easily configurable
Rugged, Die-cast Aluminium enclosure
High Noise immunity.
Hazardous-area installation in IP65 execution
Proven record of several thousand installations
Lifetime warranty on design and workmanship

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Earthing Relays

SPS-600 Earthing Relay

SGR-250 Earthing Relay (Vehicle Static Grounding System)

Static Charge Grounding Relay (Earthing Relay - Tanker Loading)

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