standards: MT393-1995 mine differential pressure sensor is general technical condition type: mine intrinsically safe marks:ExibI voltage: 12 ~ 18 v DC Working current: 50 or less ma Measuring range: 0 ~ 6 mpa (the user can specify separately) Overload capacity: 150% maximum measured values Frequency: 200 ~ 1000 hz Current: 1 ~ 5 ma, 4 ~ 20 ma