Tek-Trol Tek-LCD 7802A, Instruction Manual, Page: 32 / 43

4.5.2 Alarm & Pulse Output (
OUTPUT
)
The Tek-LCD 7802A is equipped with an NPN open collector output that may be set up for high or
low rate alarm trip point, total alarm trip point, or pulse output based on K-factor. The pulse output
frequency may be programmed for 2, 4, 8, 16, 32, 64, or 128 Hz.
The output may be disabled by selecting off. When alarm indication is enabled, the HI and LO
symbols are used accompanied by a flashing display. The alarm status will show on the display even
if the output is not wired.
4.5.3 Alarm Output ( Alr
m
)
•
Rate high alarm trip point:
program set point above reset point.
•
Rate low alarm trip point: program set point below reset point.
•
Rate alarm deadband is determined by the difference between set and reset points. Minimum
deadband is one display count. If set and reset points are programmed the same, output will
reset one count below set point.
•
Total alarm trip point: program total set point. Alarm reset is triggered by total reset (There is
no reset parameter entered for total). If automatic total reset is enabled, this setting will be
the trigger point for the timer. It is not necessary to have the output wired for automatic reset
function to work.
To acknowledge an alarm, press the Enter button once for acknowledge prompt and a second time to
confirm.
SET
TOTAL
0 8.000