First of all, we need to understand the principle and structure of the explosion-proof S-type pressure sensor. Explosion-proof S-type pressure sensors are usually composed of pressure sensitive components, signal processing circuits, and explosion-proof housings. Its working principle is to sense the pressure change through the pressure sensitive element, convert the pressure signal into an electrical signal, and then process it through the signal processing circuit to finally output the corresponding pressure value. The explosion-proof housing is to ensure that the sensor can operate safely in a flammable and explosive environment, and to prevent sparks, arcs, etc. from igniting combustible gases or liquids in the external environment.
The requirement of explosion-proof class is essential for the design and use of explosion-proof S-type pressure sensors. The explosion-proof grade is usually certified by the relevant national agencies and classified according to certain standards. Common explosion-proof grades are EX D IIC T6, EX D IIIC T4 H2, EX E II2G C2 T4 GA, etc. These ratings represent different explosion protection requirements, including the operating temperature, humidity, gas type, pressure range, protection level, etc. of the equipment.
For the explosion-proof S-type pressure sensor, the requirements for its explosion-proof grade mainly include the following aspects:
1.Material and structure of explosion-proof shell: The explosion-proof shell should be made of non-conductive and non-flammable materials, such as cast aluminum, stainless steel, etc. The structure of the housing should be able to withstand certain shocks and vibrations, and have good sealing properties to prevent combustible gases or liquids from entering the inside of the sensor.
2.Requirements for electrical performance: The electrical performance of the explosion-proof S-type pressure sensor should meet the requirements of relevant standards and specifications. For example, the signal output of the sensor should be a low-voltage, low-current signal to reduce the possibility of electrical sparks. In addition, the sensor should have functions such as overload protection, short-circuit protection, etc., to prevent electrical faults from causing damage to the sensor or causing safety accidents.
3.Requirements for explosion-proof connection: During the use of explosion-proof S-type pressure sensors, they need to be connected to other equipment or pipelines. These connections should use explosion-proof connectors, such as explosion-proof cables, explosion-proof joints, etc., to ensure the tightness and explosion-proof performance of the connections.
4.Requirements for the installation environment: The explosion-proof S-type pressure sensor should be installed in an environment that meets the relevant explosion-proof requirements. For example, in flammable and explosive environments, the sensor should be installed at a distance from the ground to reduce the contact of flammable gases or liquids with the ground. In addition, the sensor should be installed in the correct orientation to prevent measurement errors or damage to the sensor.
5.Requirements for regular maintenance and calibration: In order to ensure the normal operation and safe use of explosion-proof S-type pressure sensors, they should be regularly maintained and calibrated. Maintenance includes cleaning the sensor surface, checking whether the connection is tight, etc.; Calibration includes calibrating the sensor's zero point and span to ensure the accuracy and reliability of its measurements.