090-252 Rev A
2-6
prevents the probe from driving freely and reel alarm is not enabled to
stop the system.
2.2.2.1.4 Option 4, Sensor Trip Points
This option displays the trip points for the upper and lower level sensors,
bottom reference, and upper level sensor shorted. In addition, the set
points for the D/A converters are shown.
These quantities are for diagnostic purposes and are useful for
troubleshooting by factory personnel. These quantities cannot be
changed here; they can only be changed by plugging into the signal
conditioning card.
2.2.2.1.5 Option 5, Alarm Levels
This option allows the user to set the various alarm levels for liquid in the
tank. These include the low level alarm, the low, low level alarm, the high
level alarm, and the high, high level alarm.
2.2.2.2 Option 2, Temperature (Edit Temp Parameters)
Choosing option 2 on the Edit Parameters menu brings up the "Edit Temp
Parameters" submenu.
2.2.2.2.1 Option 1, Calibration Values
This option brings up the calibration values that go along with the
temperature sensor. These are the resistance values of the platinum
element at the ice point and at the nitrogen point. These values must
match the values on the configuration sheet supplied when the M6290 is
shipped. Temperature readings are calibrated according to these two
values, so if they are set incorrectly, temperature readings will be
incorrect.
2.2.2.2.2 Option 2, Alarm Levels
This option allows the user to edit the temperature values at which alarms
will be generated. They include the low temperature limit, the high
temperature limit, and the temperature deviation limit. The temperature
deviation limit applies when a profile run is made. Each point is compared
with the next point; if the difference in temperature is greater than the set
limit, this alarm will be generated.
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