Advances in Explosion Protection: How Advanced Solutions Open New Doors

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False signals can result from electrical spikes, particle impacts on the detector face, process pressure changes, etc. Signals can be filtered and compared in order to make a decision. A key example is the ANDing of two detectors on the same process. By requiring both detectors to indicate an activation pressure simultaneously, the likelihood of activation from particle impact, for example, is greatly reduced.

A continuous pressure signal can also be used for warning purposes. Warning signals result when the pressure exceeds a pre-set level, lower than the activation pressure, but indicates a problem in the process. Product build-up on a detector face, for example can eventually result in activation. Such warnings can also be used to indicate low operating pressure conditions.

Diagnostics and review in Case of Incident with Digital Controllers

In the event of activation, the process pressure history before and after the activation time, can be captured for review. Detailed process data of several hundred milliseconds duration and process trend data of several seconds can be captured (see Fig. 3). This data has significant value in diagnosing the event and verifying the cause of the activation. It also records that time of activation which can be matched with other process data.

Mechanical Explosion Protection Technology

In the overall process of designing an explosion protection system, a decision will have been made about the protection objective. The objective selected by the owner/operator is matched with the appropriate technology as shown below. Active systems generally rely on detection and control described above while passive systems do not.

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