UT_MEAS_CHECK — A measurement's four levels (switch, transmitter, both or none)

Checks one UT_MEAS
measurement (pressure, flow, suction level…) against its HH, H, L and LL levels,
whatever is fitted on site: a transmitter, a high and/or low switch, both, or
nothing. The building block the pump and controllers use; usable on its own.

Pins

How it works

• Nothing is checked unless installed.
• A transmitter is checked against the four UT_LEVEL setpoints.
• The high switch raises the level highSwitch names (UT_LVL_HIHI, UT_LVL_HI, or
  UT_LVL_NONE = not fitted); the low switch the level lowSwitch names. The switch
  pins are TRUE = signalling; there is no NC setting: wire a NC contact through NOT.
• BOTH: either the switch or the transmitter raises the level, so the switch backs up
  the transmitter. Each level has one delay, one reset and one count either way.
• onlyWhenRunning: checked only while Running. maskAtStart: the low levels are
  ignored while Masked.
• Each level's status fields stay up to date in the record, including timeLeft
  (Meas.lo.timeLeft: its delay, or its recover / retry wait, still to go).

For block builders: UT_MEAS_RUN

The same logic as a function, UT_MEAS_RUN, which the pump and controller blocks
use inside (see UT_PROT_RUN). The
owning block keeps the measurement's working state in a UT_MEAS_ST (one
UT_PROT_ST per level) and passes it with the record.