Raytech TraceTek TTDM-128, Руководство пользователя

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Multiple Events
SIMULTANEOUS EVENTS ON DIFFERENT SIM CHANNELS
The TTDM-128 is capable of monitoring many sensing circuits. Each SIM operates
independently of other SIMs in the leak detection network. The TTDM-128 tracks
information for all SIM channels and is capable of handling multiple events that occur in
the same time frame. Any new event takes precedence on the LCD display. The LCD
display will pause temporarily on the most recent event, giving the local operator time to
read the LCD message and take action. After pausing several minutes on the most recent
event, the TTDM-Plus display resumes automatic scrolling through each connected SIM
channel.
At any time, the operator may manually select a channel by using the left or right arrow
keys. When a channel has been selected manually, the display pauses on the selected
channel for several seconds before scrolling resumes.
MULTIPLE EVENTS ON A SINGLE SIM CHANNEL
In some circumstances, multiple events may occur on a single SIM channel. The system
continues to monitor during Service and Leak alarms, ensuring that the installation
provides full-time protection. The TTDM-Plus stores all events in memory, and in addition,
updates the display based on the sequence of events in a SIM channel.
MOVING LEAK
The TTDM will re-alarm when the leak moves more than the re-alarm distance, for which
the default is 2 m (5 ft). The audible alarm will sound, the third line of the LCD will change,
and a new event will be added to the Events History.
Example: suppose an initial leak is detected at 110 m. The TTDM would display:
CH01 USER_LABEL_0001
Leak 110 m
HH:MM DD-MON-YYYY
Suppose also that before repairs can be made, the leak spreads. Once the module has
detected significant movement of the leak (that is, a movement greater than the re-alarm
distance, see page xx), the TTDM-128 module goes into alarm once again:
CH01 USER_LABEL_0001
Leak 110 m
Re-Alarm 115 m
HH:MM DD-MMM-YYYY
The LCD now displays the first leak (on the second line of the display) and the most
recent alarm on the third line. The first leak recorded on the SIM channel is likely to be
close to the source of the leak. The most recent leak shows the current “electrical center”
of the liquid (essentially a weighted average). If the Re-Alarm location is relatively close to
the fi
rst (as in the example above), it is likely that the leak has spread.
Should the leak continue to spread, the TTDM would re-alarm again and the re-alarm
location is updated accordingly:
CH01 USER_LABEL_0001
Leak 110 m
Re-Alarm 120 m
HH:MM DD-MON-YYYY