User manual

Allowed range: 0.0 dbar to 6000.0 dbar.
Deep Error <E>
Deep error defines a pressure above (more shallow than) the deep pressure stop. If the
system detects a zero pressure rate while inside the deep error window on a downward profile, the
system stops profiling. The mid-water obstacle ramming behavior is not triggered.
The deep error is ignored on upward profiles. The deep error allows the operator to
compensate for current forced mooring dynamics and for uncertainty in the actual depth of the
bottom. If the currents assumed in calculations of mooring dynamics are weaker than anticipated
or if the bottom is shallower than expected, the deep bumper may rise above the deep pressure
stop. In these cases the obstacle ramming behavior would be futile. The deep error is
programmed based on calculations of the dynamic mooring behavior in a range of anticipated
currents and knowledge of the possible depth error. Inside that window a zero pressure rate is
interpreted as the deep bumper, and the ramming behavior is not triggered. The profile
terminates as if the deep pressure stop had been detected.
Allowed range: 0.0 dbar to 6000.0 dbar.
Profile Time Limit <T>
The profile time limit is the final layer for stop detection. This limit is the maximum time
allowed for profiler motion. When the system is unable to detect a pressure or pressure rate based
stop (and the battery voltage and motor current are within their prescribed limits), the profile is
terminated based on elapsed travel time.
If the time limit expires while the MMP is profiling, the system halts profiler motion.
The sensors continue to log for two minutes before the firmware stops logging and moves the
sensor data to the flash card. The time limit applies only to the period of profiler motion during a
single profile. It does not include the sensor logging intervals that occur before motion starts and
after it ends or the time required to move data from the sensors to the flash card.
Operator changes to shallow or deep pressure, cause the firmware to calculate the time
that will be required to cover that distance: profile time limit = 1.25 × (deep pressure - shallow
pressure) / nominal profiling speed
The additional time (25%) is intended to insure that the time limit remains long enough
when the main lithium battery nears exhaustion and profiling speed is reduced. The operator may
accept or manually change the suggested time limit. The operator may wish to round off the
G-50