The instrument is composed of several key components, including a sampling system, an oil bath, a measuring chamber, a constant temperature controller, a measurement circuit, and an explosion-proof structure. It is divided into two main sections: the instrument box and the constant temperature oil bath box, which are stacked one on top of the other for compact and efficient design. Four supporting columns, all constructed with explosion-proof features, hold the two units together. The instrument box is manufactured according to GB33836.2-83 standards for flameproof electrical equipment, ensuring compliance with safety requirements in explosive environments.
The wiring device inside the meter box follows the specifications outlined in the explosion-proof structure drawings. Cables used must be multi-stranded and flexible, avoiding the use of rigid core or aluminum cables. The outer diameters of the cables are set at φ5mm and φ8mm respectively, allowing the sealing ring to securely grip the cable once the compression nut is tightened, thereby maintaining the required explosion-proof integrity.
The rubber sealing ring used for cable entry into the instrument box is made of 3001 rubber with a Shore hardness between 45 and 55. This material is capable of withstanding the aging test specified in Chapter 29 of GB3836.1-83. All terminal connections are considered explosion-proof parts, and users must avoid scratching or damaging the flameproof surfaces during installation or maintenance. The ammeter and display window glass are made of tempered glass, providing both durability and safety. All metal joints that require explosion-proof protection are coated with 204-1 rust-preventive oil.
Inside the constant temperature oil bath, transformer oil serves dual purposes: it acts as a heat exchange medium and also provides insulation with excellent arc suppression properties. A 9OW explosion-proof motor is used for stirring, while an M15 grounding bolt ensures proper connection for the explosion-proof box cover.
The sampling system is designed with a drainage structure, allowing the oil sample to be drawn from the process pipeline and then processed before entering the constant temperature oil bath. If the oil temperature is higher than the desired constant temperature, additional cooling equipment should be installed. Once the oil reaches the correct temperature through heat exchange within the coil, it flows into the measuring chamber, which is a sealed container connected by a heat exchange coil and directly immersed in the oil bath. Continuous flow of oil allows for continuous measurement.
The measured electrical signal is transmitted via cable to the instrument box. Ultrasonic transducers are mounted on the caps at both ends of the measuring chamber. These caps are made of an alloy aluminum material with acoustic impedance similar to that of the transducing wafer, improving sound transmission. The wafer is attached to the aluminum cap, and a small amount of chelating agent is applied between the cap and the wafer’s contact surface. This ensures that when the wafer vibrates, the ultrasonic waves carry more energy through the aluminum cap and into the oil, where they can be effectively received by the receiving transducer.
The temperature control system includes a platinum resistance thermometer located in the oil bath and a microcontroller-based control circuit within the instrument box. When the thermometer sends the temperature signal to the microcontroller, it regulates the heater to maintain a stable and consistent oil bath temperature.
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