Essential Automation Knowledge Every Excellent Instrument Technician Must Know
The Importance of Product Knowledge in Safeguarding the Company
Our senior engineer, Director Zhang, provides guidance for the company. With his extensive experience and unique insights, he has summarized several key points related to explosion-proof instruments and the precautions for their use, for everyone to refer to and learn from. The pressure transmitters involved include the following categories: Differential Pressure Transmitters, Absolute Pressure Transmitters, Flange-Mounted Level Transmitters, Radar Level Gauges, Ultrasonic Flow Meters, etc.
Concept and Explosion-Proof Measures of Explosion-Proof Instruments
01 Explosion-Proof Type Instruments
These instruments have enclosures that can withstand the pressure of an internal explosion and prevent it from causing an external explosion. The symbol for this type is "d."
02 Intrinsic Safety Type Instruments
These instruments have electrical circuits that, under normal working conditions or fault conditions, do not produce electrical sparks or thermal effects capable of igniting the specified explosive mixtures. The symbol for this type is "ia."
03 Safety Barrier
A safety barrier is installed in the control room and serves as the interface between the control room instruments and the field instruments. It transmits signals while also ensuring that the energy transmitted to hazardous areas is below the ignition energy level of explosive gases or mixtures, thus ensuring the system's spark-proof safety.
04 Precautions for Using Explosion-Proof Instruments
1. Check whether the instrument housing has the EX symbol and whether the explosion-proof marking matches the specifications of the hazardous substances at the site.
2. Intrinsically safe transmitters must be equipped with a safety barrier in order to be used in hazardous areas.
3. The instrument enclosure must have proper grounding.
4. In hazardous areas, power must be turned off before opening the cover.
5. The specification of the incoming cables for intrinsically safe transmitters is determined by the jointly certified safety barrier.