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ALARMS menu by selecting the ENABLE option so that no appears to the left of this
option. Once everything is set, select ENABLE once more to activate the alarm, indicated
by the presence of the . (Refer to Section 4.2)
When setting up alarms, you may get unexpected results from the relays if they are
enabled. Ensure there is nothing connected to the relays that could result in an
accident due to random closing of the relays during setup and always DISABLE the
alarm as described above. Make the changes and then re-enable the alarm.
There are many different ways the alarms can be set up. All the alarms can be assigned
to a single channel and may be of the same type giving for example a various degrees of
high warning and ultimately a high shutdown indication. Also, the relays may be assigned
to any combination of alarms. This would allow a single relay output to indicate any alarm
active. The combinations are endless.
2.5.3 Alarm Indication
There are three indications of alarm condition: the relay outputs, visual icons on the
display and audible alarm.
When an alarm is armed and functioning, it is indicated by a small "1", "2", "3" or "4" in
reverse video on the bottom left hand side of the graphic display. These status indicators
remain on as long as the alarm is enabled. If an alarm is triggered (in alarm condition),
the status indicator will blink and the internal beeper will sound. The beeper can be
permanently disabled from the Advanced Setup Menu - BEEPER - ALARMS - OFF.
The relays close on an alarm condition, assuming they have been set up correctly. The
relays can be set as fail-safe by reversing the logic of the alarms (Advanced Setup Menu
- RELAYS - FAILSAFE).
2.6 MEMORY
CARDS
The memory cards used are standard CompactFlash™ cards. We recommend the use of
INDUSTRIAL GRADE
cards. The cards are keyed and can only go into the recorder right
side up. The largest capacity card that can be accommodated is 2 Gigabytes.
2.6.1 Care of the Data Cards
Do not expose the cards to direct sunlight or extremes of temperature for any length of
time. Do not expose to moisture. Do not bend or twist. Avoid high static discharge. Mail in
suitable packaging to avoid postal damage. When transporting, use an anti-static bag or
the plastic enclosure in which the card is supplied.
2.6.2 Card Storage Capacity and Data Type
Depending on what else is stored on the card (e.g. configurations files, other data files),
data storage capacity can be roughly calculated by the following formulas:
Number of samples is card size divided by 4.4. The time that it will take to fill a card is
roughly the number of samples divided by the sample rate. For example, a 32MB card will
hold roughly 32,000,000 divided by 4.4 = 7,272,727 samples. At 5 samples per second
this is 1,454,545 seconds or 404 hours or approximately 16.8 days.
Summary of Contents for Data Chart 1250
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