The present invention provides a low-irritant pesticidal emulsifiable concentrate comprising 1 to 60% by weight of at least one pesticidal active ingredient compound selected from the group consisting of pyriproxyfen and a pyrethroid compound, 2 to 15% by weight of at least one surfactant and 15 to 90% by weight of at least one aromatic ester solvent represented by the formula:. and pipe and wiring connections, with reduced pressure loss due to pipe connections, with easy change of arrangement of modules, free from corrosion even using a corrosive fluid for the fluid, and enabling control of the flow rate even with pulsation of the inflowing fluid is provided. A deflector post is mounted adjacent to the temperature sensor probe, and is spaced upstream of the temperature sensor probe to change air flow patterns around the temperature sensor probe and to intercept particles moving with the air flow toward the temperature sensor probe.