User manual

stops. The sensor data acquisition continues for two minutes before the firmware stops logging
and transfers the sensor data to the flash card.
NOTE
The pressure stops are pressures (dbar). Normally, physical locations on the mooring are
commonly referenced in meters. The MMP does not integrate state variables over the depth of
the water column to construct a mapping between decibars and meters.
Shallow Pressure <S>
Shallow pressure is the intended “top” of the profiling range. The MMP stops profiling
on an upward profile when the ambient CTD pressure becomes less than the shallow pressure
limit. The shallow pressure limit is ignored during downward profiles. Range is deep pressure to
0.0 dbar.
Deep Pressure <D>
Deep pressure is the intended “bottom” of the profiling range. The firmware stops
profiling on a downward profile when the ambient CTD pressure becomes greater than the deep
pressure limit. The deep pressure limit is ignored during upward profiles. Range is shallow
pressure to 6000.0 dbar.
Shallow Error <H>
Shallow error defines a pressure below (deeper than) the shallow pressure stop. If a zero
pressure rate is detected while inside the shallow error window on an upward profile, the MMP
stops profiling. The mid-water obstacle ramming behavior is not triggered. The shallow error is
ignored on downward profiles.
The shallow error allows the operator to compensate for mooring dynamics and
uncertainty in the actual depth of the bottom. As the mooring leans over in a current or if the
anchor is deeper than expected the shallow bumper may be pulled below the shallow pressure
stop. In these cases the obstacle ramming behavior would be undesirable. The shallow error is
chosen based on calculations of the dynamic mooring behavior and knowledge of the possible
depth error. Inside that window a zero pressure rate is interpreted as the shallow bumper and the
ramming behavior is not triggered. The profile terminates as if the shallow pressure stop had
been detected.
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