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Infrared Gas Analyzer Operation
Teledyne Analytical Instruments 57
Figure 3-6: Hysteresis Example for a High Limit Alarm
An alarm output is turned ON if measurement value exceeds the
upper limit value as shown in Figure 3-6. Once the alarm output has
been turned ON, it is not turned OFF until the process value falls below
the hysteresis width.
Note: The hysteresis setting is common to all alarms.
To set the hysteresis value:
1.
From the “Alarm No. Selection” screen, point the cursor
to “Hysteresis” by pressing the UP or DOWN key then
press ENT.
2.
In the “Hysteresis Value Setting” screen that appears,
enter hysteresis values using the UP or DOWN keys to
increment or decrement a digit. Use the SIDE key to
move to the next digit. When finished, press ENT.