To obtain an on-line water quality meter for suppressing the generation of microbes and germs in a channel without being attacked by fluid by forming a liquid-contacting part on the inner surface of the channel in a motherboard using a corrosive-resistant material or an antibacterial material.
All channels 313 in a water quality meter are formed three- dimensionally in a three-dimensional motherboard 101, and fluid 314 flows in the channels 313. A liquid-contacting part 315 on the inner surface of the channels 313 cannot be attacked by the fluid 314 and corrosion resistance or antibacterial property needs to be improved for suppressing the generation of microbes and germs in the channels 313. Therefore, after a corrosion-resistant material such as fluororesin, liquid-shaped rubber, and electroless plating or an antibacterial material such as silver, copper oxide, and titanium oxide 316 is allowed to flow to the channels 313, heat is applied for coating by several μm in thickness, thus enlarging the range of applicable fluid being generated due to the material restriction of the motherboard 101 being formed in one piece by the light-shaping method.
EHASHI MITSURU
KASAI SHOZO
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