A seawater injection system comprises a primary seawater supply line, a diverted seawater sampling line, and an online particles count monitoring system. The online particles count monitoring system is coupled to the primary seawater supply line through the diverted seawater sampling line such that a portion of a primary flow of seawater can be diverted to the online particles count monitoring system. The online particles count monitoring system comprises a diverted seawater inlet, a core plug assembly, a diverted seawater outlet, and an inlet pressure monitoring station between the core plug assembly and the diverted seawater inlet. The core plug assembly comprises a core plug and a removable particle filter. The inlet pressure monitoring station generates a particles count signal based on fluid pressure in diverted seawater moving through the diverted seawater sampling line in a downstream direction of the core plug and the removable particle filter.

Provided is an airborne microbial measurement apparatus and a method of measuring the same. The airborne microbial measurement apparatus includes a particle separation device comprising an introduction part for introducing air and a nozzle part disposed on one side of the introduction part, a microbial particle passage through which microbial particles in the air passing through an inner passage of the nozzle part flow, an air particle passage through which air particles in the air passing through an outer space of the nozzle part flow, a collection device communicating with the microbial particle passage, the collection device comprising a filter part onto which the microbial particles are collected, and a luminescence measurement device dispose on one side of the collection device to detect an amount or intensity of light emitted from the microbial particles collected onto the filter part.

A seawater injection system comprises a primary seawater supply line, a diverted seawater sampling line, and an online particles count monitoring system. The online particles count monitoring system is coupled to the primary seawater supply line through the diverted seawater sampling line such that a portion of a primary flow of seawater can be diverted to the online particles count monitoring system. The online particles count monitoring system comprises a diverted seawater inlet, a core plug assembly, a diverted seawater outlet, and an inlet pressure monitoring station between the core plug assembly and the diverted seawater inlet. The core plug assembly comprises a core plug and a removable particle filter. The inlet pressure monitoring station generates a particles count signal based on fluid pressure in diverted seawater moving through the diverted seawater sampling line in a downstream direction of the core plug and the removable particle filter.