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A water tank level switch may work correctly during normal filling yet leave an unsafe or confusing state after power returns. The instrument, PLC and pump starter do not necessarily recover at the same time. Define the permitted restart sequence and test it separately from normal level switching.
Identify which part of the chain lost power
Record the instrument supply, controller supply and pump-control supply as separate items. A restart test of the entire panel does not show how the system behaves when only the sensor loses power. The controller must interpret the selected output according to the documented circuit and process requirements.
METRAVON MV-SP601 is an RF admittance point-level switch. Confirm the delivered output and power-loss behaviour; do not infer the remote state from the normal local indication. A simple binary circuit may not distinguish every wiring fault from a normal material state.
Water tank level switch recovery checks
| Event | State to observe | Pass condition |
|---|---|---|
| Sensor supply lost | Actual output and receiving input. | Does the approved control design recognise or appropriately handle this condition? |
| Controller restart | Retained values, startup permissions and alarm latches. | Can a stale state be mistaken for current level information? |
| Pump power returns | Command, starter state and physical water flow. | Is automatic resumption permitted for the actual tank condition? |
| Manual reset | Required checks before the operator releases the stop. | Does acknowledgement merely silence an alarm, or authorise an action? |
Test without creating an uncontrolled fill
Qualified personnel should use an approved commissioning procedure that identifies the process consequences and temporary safeguards. Record the physical tank condition, instrument indication, controller state and observed pump response for each test. An electrical simulation proves only the part of the circuit covered by that simulation.
After restoration, establish that the real sensing path is active and that authorised overrides or forced inputs have been removed. Confirm both alarm assertion and recovery using the permitted material test. Keep the normal start/stop settings with the recovery record, but do not use them as a substitute for the restart sequence.
For operating-band selection, use the separate water-tank pump-cycle guide. This recovery review concerns what happens after an interruption, not how much working volume the tank should provide.
Q1. Should every power interruption require manual restart?
There is no universal answer. The responsible control design must consider the process, unattended operation and consequences of resuming flow. Record the required behaviour rather than relying on an accidental default setting.
Q2. Does an illuminated switch prove the pump may restart?
No. It indicates only the local state provided by that device. The controller may also require valid level information, available water supply, cleared faults or other permissions defined by the system.
Summary
Send the supply diagram and restart requirements for an MV-SP601 interface assessment. Handover should show what the complete system does after interruption, not merely that the switch turns on again.
