mpo55Danfoss MP 55 Differential Pressure switches delay of relay 90 sec. 060B017291 Adjustment Cut out for falling pressure. Ambient temperature -40 - 60 °C. Ambient temperature -40 - 140 °F. Ammonia application No. Approval CCC, CE,MAK MODERN LIV POSSIBLE DKRCC.PD.CG0.B7.02 520H7400 Data sheet Differential Pressure Control Types MP 54, MP 55 and MP 55A Features y Wide regulating range y