PD6800-0L1 Explosion-Proof Loop-Powered Process Meter
Instruction Manual
18
Alarm Output (
OUTPUT
)
The PD6800-0L1 is equipped with an NPN open
collector output that may be set up for high or low
alarm trip point based on the level display (
LEVEL
) or
the volume scale (
VOLUME
). The output may be
disabled by selecting
OFF
.
When the alarm is enabled for level and the alarm set
point has been reached, the level display will flash,
accompanied by the lower display alternating
between normal display and
ALARM
. A tank height
indicator segment will flash at the level the alarm is
set to while the level indicator is at or above the alarm
point.
When the alarm is enabled for volume and the alarm
set point has been reached, the lower display will
flash, alternating between its normal display and
ALARM
.
To set a high alarm, program the set point value to be
greater than the reset point.
To set a low alarm, program the set point value to be
less than the reset point.
To acknowledge an alarm, press the
ENTER
button
once for acknowledge prompt and a second time to
confirm. Acknowledging an alarm will turn off the
alarm output and stop the display from flashing. The
lower display will continue to alternate between its
normal display and ALARM until the alarm condition is
cleared.
The alarm status will show on the display even if the
output is not wired.
Input Signal Filter (
FILTER
)
The noise filter is available for unusually noisy signals
that cause an unstable process variable display. The
noise filter averages the input signal over a certain
period. The filter level can be set to low (
LO
), medium
(
MED
), high (
HI
), or off (
OFF
). The higher the filter
setting, the longer the averaging time and so the
longer the display may take to find its final value.
The filter contains a noise filter bypass feature so that
while small variations in the signal will be filtered out,
large, abrupt changes to the input signal are
displayed immediately.
Volume Display Scaling (
VOLSCAL
)
Volume may be scaled as a function of the level dis-
play. It may use up to 32-point linearization. The mul-
ti-point linearization can be used to linearize the dis-
play for non-linear signals such as those from level
transmitters used to measure volume in odd-shaped
tanks.
To scale the volume display, select the decimal point
location (0, 1, 2, 3, or 4), then enter the level in engi-
neering units for input 1, the corresponding volume
display value, and the same for input 2.
After entering the display 2 value, confirm the new
volume scale by pressing
ENTER
at the
Save
menu.
Note:
To display the volume, see Configuring the Display
on page 14.
