Most industrial plants constitute a hazardous zone. Many materials essential for process operation, and often also the finished prod-ucts, are flammable or explosive.
The more of these materials that are needed or generated for the manufacturing process – for example in the chemical, petrochemical or food industries – the higher the risk and the farther reaching the safety measures. Even the slightest spark or overheating can lead to an explosion with fatal consequences. Highquality measurement and control technology in industrial plants is a must.
Its routine calibration increasingly takes place in the plant, for instance using portable pressure calibrators. The requirements placed on the reference instrument used for checking in an Ex (potentially explosive) area are high. Ignition sources should always be eliminated in hazardous areas. They include calibrators without the appropriate approval. Such sources could trigger an explosion as a result of friction or impact sparks or possibly an electrostatic discharge. This hazard potential in a calibrator can be prevented by using suitable materials and design measures. EMC-protected ABS plastic is used, amongst other things, to prevent static discharge from the calibrator enclosure during handling
