Sierra RedyCompact Meter, Инструкция по эксплуатации, Страница: 39 / 73

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Reset Trigger (Default: Falling edge):
When you use input 1 or 2 as an alarm reset, you can set exactly
on which action the alarm is reset. If for example the input is a
manual push button, the rising edge is the moment that you push
the button and the falling edge the moment when you let go of the
push button.
Output driver (Default: Normal)
The output driver setting offers the possibility to invert the action
from the alarm switch and set the alarm to a predefined state which
is convenient for testing systems.
The “Always low” and “Always high” override all alarm settings and
flow signals. Please make sure that you take precautions before
you use these
options in a “life” system.
4.11.3 Totalizer
The totalizer calculates how much gas has totally passed through the flow meter based on the
measured flow and the factor time. The instrument has 2 totalizers. Each can display a maximum
of 8 digits. The totalizer value will be stored internally as an IEEE 754 floating point number. The
internal totalizer will never roll-over, the maximum value far exceeds the lifetime of the instrument.
One of the two totalizers is resettable, the other can never be reset and always continues to count
for the lifetime of the instrument. Both the totalizer values are stored every 10 minutes in a
permanent memory so even if there is no power supply the last stored value will still be kept. If you
Important Note
The “Reset trigger” function only relates to alarm reset by input 1 or
2.
Important Note
Please note that the reset overrides the alarm. Even if the alarm is
still valid, if you set this reset trigger to high level, the alarm is
ignored until the level becomes low again.
If the blue represents the input being active you can see the
different trigger points below (See Figure 11).
Inverted
□
Normal
□
Always low
Always high
□
□
Figure 10: Explanation trigger points
□
Both edges
□
Falling edge
□
High level
Low level
□
□
Rising edge
□