ATI Q46D Dissolved Oxygen System Part 6 - Configuration
42
O&M Manual
Rev-N (4/21)
*Failsafe This function allows the user to set the optional system relays to a
failsafe condition. In a failsafe condition, the relay logic is reversed so
that the relay is electrically energized in a normal operating state. By
doing this, the relay will not only change state when, for example, an
oxygen limit is exceeded, but also when power is lost to the controller.
When failsafe is selected to be ON, the normally-open contacts of the
relay will be closed during normal operation. In an attempt to make this
configuration less confusing, the LCD icon logic is reversed with this
setting, and the icon is OFF under this normal condition. Therefore,
when the trip condition occurs, the closed N.O. contacts will be opened
(relay de-energized), and the LCD icon will illuminate. In addition, a
power fail would also cause the same contacts to open.
Set Default The Set Default function allows the user to return the instrument back to
factory default data for all user settings or for just the calibration default.
It is intended to be used as a last resort troubleshooting procedure. All
user settings or the calibration settings are returned to the original factory
values. Hidden factory calibration data remains unchanged. Press
ENTER to initiate user entry mode and select either CAL or ALL with the
UP arrow key. The default CAL routine will reset the zero offset to 0.0
nA and reset the slope to 100%. The default ALL routine will reset all
program variables to factory default and should be used with care since it
will change any user settings that were programmed in the field..
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