IP class - which to choose

IP54 is suited for indoor use with limited condensation and no water jet cleaning. IP66 is suited for outdoor use where condensation occur. If high-pressure water cleaning with aggressive cleaning agents is used the sensor need further protection.
 
24 V AC/DC Liquid Level Switches 

HBOR/C HBOR/C HBOR HBOR/C-U HBSR-HP HBSR-U HBSR HBSR-SSR-1/IP HBSR-HFC HBSR-HFC-U HBSR-HFC HBSR-HFC-SSR-1/IP HBSC2 HBSC2-U HBSC2 HBSC2-SSR-1/IP HBSO-SSR-1-HT HBSO2-MT HBSO1-MT HBSO2 HBSO1 HBSO-LT

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Download:  document Level Switches - Product Selection Guide (435 KB)