4003_5001_D02
Page 10 of 35
DETECTION event is signalled when the flux reading has peaked and the buffer (at current fill
rate) is filled.
During DETECTION display shows PIG nnn DETECTED and the LEDs around the display will flash
every 1 second and the relay and current loop outputs will be in the DETECTION state.
The unit will remain in this state for the length of time defined by the DETECTION delay. A
countdown timer representing the DETECTION delay will be shown at the bottom of the screen
along with the peak gauss recorded. When the DETECTION delay reaches 00:00:00 the unit will
return to LISTENING.
If DETECTION starts and there is no peak (i.e. pig inches closer but does not stop or pass) within
3 minute and 20 seconds the signaller will signal the pig DETECTION. If after the DETECTION
period completes, the pig is still close and still moving (or moves away) such that the
THRESHOLD is again crossed, a second DETECTION will occur.
4.4.3.
DETECTION DELAY
The DETECTION delay controls how long the unit will signal an event for. Usually it will be
configured to give the magnetic pig enough time to get out of range of the sensor after it has
been detected to avoid re-trigger. When dealing with pig trains, the expected pig speed and
separation should be used to configure a suitable value for the DETECTION delay such that the
unit will not detect the same pig twice but will enter LISTENING mode in time to detect the next
pig.
The unit can log up to 100 events with date, time,
and the peak DIFFERENCE flux reading. Once 100
events have been logged the screen opposite will be
displayed, indicating that the logger memory is full.
Subsequent events will be signalled but no data will
be logged. If an SD card is installed and Logging is
disabled, the EVENTs will continue to be logged to
the SD card if the EEPROM is full.
The DETECTION delay can be set to any value between 00:00:00 and 98:59:59 (in HH:MM:SS
format) using the CONTROL BUTTON or via the serial link. There are 2x special values which can
be used:
DEBUG MODE
–
If the DETECTION delay is set to 00:00:00 then the unit works in DEBUG mode.
If a reading greater than the THRESHOLD value is detected in DEBUG mode then the LEDs will
flash every second to indicate that the THRESHOLD has been crossed, but no EVENT will be
logged, and the unit will not start a DETECTION delay. This can be very useful for determining
the magnetic signature of a pig when used in combination with the CONFIGURATION SOFTWARE.
LATCHED DETECTION
–
If the DETECTION delay HH (hours) field is set to 99 then when an
EVENT occurs the unit will LATCH in DETECTION MODE showing the EVENT information and
flashing the LEDs every second. To begin LISTENING again the CONTROL BUTTON must be firmly
pressed or by resetting PIG DETECTION Modbus coil (Modbus address 10000). The EVENT data
will be logged once the event buffer has been filled.
EVENT
MEMORY FULL
Summary of Contents for 4003 MAGSIG
Page 31: ...4003_5001_D02 Page 30 of 35 ...
