 Control pressure switch
MDR-F .. Reset function (Hmin / Hmax and Htro)
Pressure switch with reset function and die-cast aluminum flange
Applications:
For oil, water and air etc.
Connection:
H G 3/8\" inner thread
DIN ISO 228/I, VDE 0660, IEC 337-1, IEC 553-1
MDR-F .. Hmax (SPDT with manual reset max.)
When pressure rises above the upper setting value, contact 11-12
opens and contact 11-14 closes and latches. When the pressure falls
below the upper setting value, the contact can be released with the
manual reset button.
MDR-F .. Hmin (SPDT with manual reset min.)
After pressure rises above the lower setting value, the function is
activated by pressing the manual reset button. When the pressure falls,
contact 11-12 closes and opens contact 11-14 when reaching the lower
cut-in value. Since the upper switching point (cut-out pressure) of the
reset pressure switch must lie above the maximum cut-out pressure of the
apparatus, the switching state remains until the manual reset button is
pressed again.
MDR-F .. Htro (SPDT with manual reset as run-dry protection)
Typically, the switch is connected in the series with the control
circut. For pressure increase, the manual reset button must be held
until the pressure lies beyond the monitoring point. When the pressure
falls below the monitoring point, contact 11-12 closes and contact 11-14
opens. When the pressure automatically rises above 10% of the monitored
pressure, contact 11-12 opens and contact 11-14 closes again
automatically, otherwise, a restart using the manual reset button must
be carried out again. NOTICE: Should there not be a rise in pressure
when pressing the button, discontinue pressing the button as a fault in
the system must be present. |
