PD6928 Ex-Proof & I.S. Loop-Powered Flow Rate/Totalizer
Instruction Manual
43
Alarm (
ALARM
)
Alarm outputs may be assigned to the rate, total, grand total, or the digital input. When assigned to the rate, the alarm
may be set as either a high alarm or a low alarm. Alarm actions (
AUTO
,
AUTO.MAN
,
LATCH
,
L-CLEAR
) determine how
and when the alarm should be reset. They operate as follows:
•
Automatic (
AUTO
):
Alarm will reset automatically once the alarm condition has cleared.
•
Automatic/Manual (
AUTO.MAN
):
Alarm will reset automatically once the alarm condition has cleared but can
also be reset using the
Enter
(ACK) button (or whichever function key is set to acknowledge) at any time.
•
Latching (
LATCH
):
Alarm must be reset manually and can be done so at any time. Press the
Enter
(ACK)
button at any time to clear the alarm.
•
Latching with Reset after Clear (
L-CLEAR
):
Alarm must be reset manually and can only be done so after
the alarm condition has cleared. Press the
Enter
(ACK) button after the alarm condition has cleared to reset
the alarm.
If the alarm is set to rate, a set and reset point must be programmed. The set point is the display value at which the
alarm will turn on and the reset point is the display value at which the alarm will turn off. If the set point is lower than
the reset point, the alarm will be a low alarm; if the set point is higher than the reset point, the alarm will be a high
alarm. The digital input alarm will trigger whenever the digital input is triggered.
For both the rate and digital input alarms, a delay before the alarm is turned on or off may be set, as well as a
fail-safe feature which reverses the on/off operation of the open collectors.
Alarm states will be displayed on the meter even if no open collector output is physically connected. These may
include a red LED backlight, flashing the rate value (rate alarm only), and a programmable alarm message.
Alarm states will be displayed on the meter even if no open collector output is physically connected. These may
include a red LED backlight, flashing the rate value (rate alarm only), a programmable alarm message, an alarm
indicator
, and flashing bargraph segment.
