Teledyne 7500ZA - Infrared Gas Analyzer - Manual (Page 62)

Settings and Calibration Model 7500ZA
Teledyne Analytical Instruments 46
6.3.2 Hysteresis Setting
The alarm hysteresis can be set or changed to prevent chattering of
an alarm output about its alarm set point. To set or change the alarm
hysteresis:
1. Navigate to the “Alarm Setting” screen and
then move the cursor to “Hysteresis” using
the UP or DOWN key. Then press ENT to
display the screen shown at the right.
2. From this screen enter the hysteresis values
by increasing or decreasing the value using
the UP or DOWN keys. Move the cursor to
the next digit with the SIDE key. When the
value is correct, press ENT to save.
The hysteresis can be set from 0-20% full
scale on the selected range.
To close the Hysteresis Settings screen or to
abort the entry midway, press the ESC key. The
previous screen will return.
Note: The hysteresis is common to all alarms (components).
Hysteresis in peak alarm setting described in Item 6.3.3
should be set separately.
Hysteresis (In case of upper limit alarm)
An alarm output is turned ON if the measured value exceeds the
upper limit value as shown below. Once the alarm output has been
turned ON, it is not turned OFF until the indication falls below the
hysteresis width from the upper limit value.