Contact Information

Address: Kamanwala Chambers, 4th Floor, Sir P. M. Road, Fort, Mumbai, Maharashtra, India, 400 001
Country: [India]
Phone: - - 91-22-67477900
Mobile: -
Fax: - - 91-22-67477901
home products Grounding Unit

Grounding Unit

Product Details:

Keywords Other General Mechanical Components, Grounding Unit, , TELTECH INSTRUMENTATION PVT LTD, India
Category Mechanical Parts & Fabrication Services > Other General Mechanical Components 
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Detailed Product Description


Grounding Detector Unit is an electronic device which ensures safe& reliable grounding of generated electrostatic charges duringloading or unloading operations of inflammable hydrocarbon products.The unit gives a local visual indication for proper grounding &transmits the signal to a remote loading control automation system.

DESIGN FEATURES

  • Local visual indication for proper or improper grounding.
  • Ensure minimum capacitance & resistance of vehicle to ground.
  • Zener barrier protected grounding loop for additional safety.
  • Remote signal to loading control system.
  • Internal heater ensures satisfactory performance in extreme cold, rain & damp weather conditions.
  • Special rugged clamp for connection to vehicle.

PRINCIPLES OF OPERATION


Whileloading & unloading of inflammable hydrocarbon liquids it isrequired to maintain an equal potential between the filling structure& the vehicle tank in order to avoid spark hazard due toelectrostatic charges. The grounding detector consists of an electroniccircuit housed in a flameproof enclosure. A special crocodile clampmade of anti-spark material connected wit an abrasion & oilresistant cable connects the unit to the vehicle. Green & red lampplaced in a glass window show a proper or improper grounding condition.Potential free relay contact outputs from the unit are connected via acable to the remote control system. When the grounding clamp of theunit is connected to the metal surface of the vehicle the device checksthe capacitance & resistance of the vehicle towards the earth. Theinternal grounding loop resistance is reduced to less than 1 ohmensuring perfect grounding of the vehicle. At the same time the redlamp switches over to green signifying proper grounding & internalrelay is actuated to give potential free contact outputs to the remotecontrol system. The vehicle grounding loop is zener barrier protectedfor added safety. In case of a break in the grounding loop duringloading operation the unit de-activates the relay signaling the remotecontrol system to stop operation in order to avoid hazard.

Aninternal heater in the form of resistance is provided to emit enoughheat in order to maintain the internal housing temperature to 30o C toensure proper functioning in adverse climatic conditions such asextreme cold, rain & damp weather. The electronic circuit of theunit is designed to detect abnormal conditions such as clamp connectedto parts already grounded or the clamp connected to insulated surfaces.



APPLICATIONS

  • Fuelling & de-fuelling of liquid hydrocarbons in the Tank Truck / Rail Wagons / Ships.


MATERIALS OF CONSTRUCTION
 

Housing Body

  • Aluminium Alloy LM25TF.

Window Glass

  • Toughened heat.
Clamp
Body
  • Aluminium Alloy LM25TF.

Contacts

  • Brass plate with hardened steel contacts.

Handle

  • Neoprene rubber.


SPECIFICATION
 

Minimum Grounding Resistance

  • 500 Ohms.

Minimum Vehicle Capacitance

  • 500 pF.
Measuring Voltage
  • 12V DC.

Measuring Current

  • 1 mA.

Power Supply

  • 230 V AC 50 Hz.

Power Consumption

  • 750 mW.

Relay Contact Rating

  • 5A, 230V.

Housing
  • Explosion proof as per IS: 2148-1981 certified by CMRS, Dhanbad, India for use in Group II A & II B hazardous areas.Weatherproof to IP-65.




Grounding Unit

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