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English–DPI610E Instruction Manual | 135
Switch Test
7.2 Switch Test
The DPI 610E can test pressure switches or pressure devices with switch contacts.
Pressure switches open or close an electrical circuit when a configured setpoint pressure level is
reached and/or exceeded.
Pressure switches commonly have two types of contact which are: normally open or normally
closed. When a pressure switch is normally open, it means that the state of the switch contacts,
when pressurised within normal operating limits, is Open. When the pre-set setpoint pressure is
reached, the micro-switch is triggered (Actuation) and the contacts change state from open to
closed. When the pressure returns within normal operating limits, the switch contacts are reset
(De-actuation) i.e. changes back to the normal open state.
For a normally closed switch the reverse is the case. At the switch point (Actuation), the state
changes from Closed to Open and at the reset point (De-actuation), it returns to the closed state.
The difference between the switch point and reset point is called Hysteresis.
To configure and do a Switch test:
Step 1
Tap on the
Tasks
icon on the
Dashboard to select the menu.
Step 2
Tap the
Switch Test
two times if using
the touchscreen or press the
OK
button
to launch the utility.
