I-WP401B Pressure Switch ihlanganisa isidluliseli sokucindezela kwesakhiwo esiyindilinga nesibonisi se-LED esijikelezayo esiphindwe kabili, esinikeza ukuphuma kwesignali yamanje engu-4~20mA kanye nomsebenzi wokushintsha we-alamu yomkhawulo ophezulu nophansi. Isibani esihambisanayo sizokhanya lapho i-alamu ivulwa. Imingcele ye-alamu ingasethwa ngokhiye abakhelwe ngaphakathi endaweni.