Section 15 00-02-0730
2019-01-15 - 8 -
Test Switch
1. Remove the cover of the MLS.
2. Place the FW Murphy magnetized screwdriver under the terminal block in the middle.
3. Adjust the position of the screwdriver down to the bottom of the circuit board until the
switch changes state (see figure #1).
a. When the meter, annunciator or controller indicates a change in the state of the
switch, it is confirmed that the switch is operating normally.
Figure #1 Switch operates normally
Test Float
4. Place the FW Murphy magnetized screwdriver close to the terminals labeled NO and
COM (see figure #2).
a. If the meter, annunciator or controller does not indicate a change in state of the
switch, the float is attached to the unit and is in the down position.
b. If the meter, annunciator or controller indicates a change in state of the switch,
the float is missing.
Figure #2 Float is Missing
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