A particle concentration analyzing system adapted to count a particle concentration in a sample fluid, comprising: a working fluid tank adapted to contain a working fluid; a sample fluid input configured to receive the sample fluid to be analyzed; a condensation particle counter comprising a fluid saturation chamber configured to saturate an ambient air flow with the working fluid, a condenser configured to condense the working fluid saturated ambient air flow from said fluid saturation chamber onto the sample fluid, and an optical particle counter configured to count sample particles present in the sample fluid; a fluid level sensor disposed inside said fluid saturation chamber; a working fluid pump adapted to transfer the working fluid from said working fluid tank to said fluid saturation chamber; an electronic control unit responsive to said optical particle counter to count sample particles present in the sample fluid, and said electronic control unit responsive to said fluid level sensor to control said working fluid pump to automatically fill said fluid saturation chamber with working fluid in response to information from said fluid level sensor regarding working fluid level in said fluid saturation chamber; characterized in that the particle concentration analyzing system further comprises an exhaust pump downstream of said condensation particle counter configured to draw fluid from said condensation particle counter, said exhaust pump in electronic communication with said electronic control unit; and an integrated ejector diluter upstream of said condensation particle counter and a dilution pump upstream of said ejector dilutor and configured to pump a dilution air flow to said ejector dilutor, wherein the dilution air flow is separate from the ambient air flow, and wherein said ejector diluter is configured to dilute the concentration of sample particles in a fluid sample at a pre-determined dilution ratio prior to the sample fluid entering said condensation particle counter by introducing the dilution air flow into the sample fluid, said ejector diluter and said dilution pump being in electronic communication with said electronic control unit. a working fluid tank adapted to contain a working fluid; a sample fluid input configured to receive the sample fluid to be analyzed; a condensation particle counter comprising a fluid saturation chamber configured to saturate an ambient air flow with the working fluid, a condenser configured to condense the working fluid saturated ambient air flow from said fluid saturation chamber onto the sample fluid, and an optical particle counter configured to count sample particles present in the sample fluid; a fluid level sensor disposed inside said fluid saturation chamber; a working fluid pump adapted to transfer the working fluid from said working fluid tank to said fluid saturation chamber; an electronic control unit responsive to said optical particle counter to count sample particles present in the sample fluid, and said electronic control unit responsive to said fluid level sensor to control said working fluid pump to automatically fill said fluid saturation chamber with working fluid in response to information from said fluid level sensor regarding working fluid level in said fluid saturation chamber; characterized in that the particle concentration analyzing system further comprises an exhaust pump downstream of said condensation particle counter configured to draw fluid from said condensation particle counter, said exhaust pump in electronic communication with said electronic control unit; and an integrated ejector diluter upstream of said condensation particle counter and a dilution pump upstream of said ejector dilutor and configured to pump a dilution air flow to said ejector dilutor, wherein the dilution air flow is separate from the ambient air flow, and wherein said ejector diluter is configured to dilute the concentration of sample particles in a fluid sample at a pre-determined dilution ratio prior to the sample fluid entering said condensation particle counter by introducing the dilution air flow into the sample fluid, said ejector diluter and said dilution pump being in electronic communication with said electronic control unit.