CONNECTION AND OPERATION:

The cluminaire (pliers) is attached to the metal part of the tank truck body. After pressing the "MEASUREMENT" button, static electricity flows from the tank truck (AT) through one of the grounding conductor wires to the grounding main (PE). The second wire measures the grounding circuit resistance, the transition resistance between the cluminaire contacts, and the resistance of the grounding conductor wires. If the total measured resistance does not exceed (8 ± 2) ohms, the "GROUNDED" indicator panel lights, authorizing the tank truck loading/unloading operation.

1. Connect the grounding conductor cluminaires to an unpainted metal part of the tank truck.

2. Turn the "NETWORK" switch to the "ON" position. Observe the "NOT GROUNDED" indicator (red light).

3. Hold down the “MEASURE” button for 2 seconds.

4. If the total contact resistance is within (8±2) ohms, the "NOT GROUNDED" indicator light (red) will go out and the "GROUNDED" indicator light (orange) will light. Five seconds after the "GROUNDED" indicator light turns on, the tanker's filling/unloading operation will begin, and the "PUMP ON" indicator light (green) will light.

5. If after 2 seconds there is no change in the status of the light indicator, then move the “NETWORK” switch to the “OFF” position, check the connection of the measuring cluminaires and repeat steps 2-4.

Grounding control during loading and unloading of explosive products and prevention of ignition due to electrostatic discharge.

Careful examination of production and technological processes reveals numerous sources of electrostatic charge that are difficult to detect and easy to miss, and as a result, they become a source of ignition in hazardous areas.

There are many examples of explosions and fires caused by static electricity during loading and unloading operations of liquid and bulk fire and explosion hazardous substances.

Between contacting bodies, especially when they rub, a contact potential difference arises. Its magnitude depends on a number of factors, including the dielectric properties of the materials, the magnitude of their mutual pressure during contact, the humidity and surface temperature of these bodies, and climatic conditions. Upon subsequent separation of these bodies, each retains its electric charge, and as the distance between them increases (as the electrical capacitance of the system decreases), the potential difference increases due to the work performed to separate the charges and can reach tens or hundreds of kilovolts. If the field strength is broken down by physical contact or charge level, a discharge occurs. The discharge energy can exceed the minimum ignition energies of all groups of potentially explosive gas atmospheres.

Static discharge in hazardous areas must be avoided at all costs due to the potential risk of fire or explosion. The most important protection is the safe discharge of static charge through potential equalization or grounding. The use of poorly conductive materials in hazardous areas is prohibited.

The transportation, loading, and unloading of chemical and oil and gas products are inherently subject to the constant buildup of electrostatic charge. Any transport operation and movement of raw materials inevitably involves friction, which is the primary cause of electrostatic charge, especially when large quantities of cargo must be moved in a short period of time, such as when loading or unloading large tankers. Stationary tanks present little problem due to the safe discharge of charge through a ground connection. A permanent ground connection is impossible for mobile tanks, such as rail tankers and tank trucks. Therefore, safe grounding must be ensured during loading and unloading operations using special devices.