Solid particle impingement probes

Sensors for the evaluation of solids entrained in fluid systems are available in two versions, intrusive and non-intrusive. 

Intrusive solid particle impingement probes are available that can be located within standard 

08 cm high-pressme access fittings. These probes work on a similar principle to electrical resistance probes, in that the change in electrical resistance with time due to the abrasive wear of the probe element is taken as proportional to the solids concentration of the fluid. 

Derived formulas that include the average particle size, the flow velocity, and, where applicable, gas-liquid ratio enable a measure of the solid particle concentration to be made. In general, this type of probe suffers from a problematic sensitivity-lifespan relationship. Probes sensitive enough to give useful data require frequent change out due to their finite lives. 

Non-intrusive solid particle impingement probes comprise a sensor that is strapped to the outside of the pipe wall in an area where particle impingement is judged to be greatest. Two types of sensor can be used to detect particle impacts, ultrasonic and stress wave. 

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