Ama-siphon we-pressure gauge asetshenziselwa ukuvikela i-pressure gauge emphumeleni wemidiya yokucindezela okushisayo njenge-steam kanye nokunciphisa umphumela wokukhuphuka kwengcindezi esheshayo.I-pressure medium yenza i-condensate futhi iqoqwe ngaphakathi kwekhoyili noma ingxenye ye-pigtail ye-siphon ye-pressure gauge.I-condensate ivimbela imidiya eshisayo ukuthi ihlangane ngqo nensimbi yokucindezela.Lapho i-siphon iqala ukufakwa, kufanele igcwaliswe ngamanzi noma yimuphi omunye uketshezi oluhlukanisayo olufanele.