Setting Alarms

In the default settings, alarms are disabled. Alarms may be set to indicate both over-maximum and under-minimum conditions.

To set up alarms:

1. Press Alarm on the front panel (see Front of LakeShore 331 Temperature Controller).
2. Toggle the arrow buttons as needed to select Input A or Input B.
3. Press Enter.
4. Toggle the arrow buttons as needed to select Alarm On or Alarm Off.
5. Press Enter.
6. Toggle the arrow buttons as needed to select among:
   • Temp C (degrees Celsius)
   • Temp K (Kelvin)
   • Linear (MX+B or M[X+B])
   • Sensor (in volts, millivolts or ohms)
7. Press Enter.
8. Enter the low value alarm trigger point as a number consistent with the units selected above.
9. Press Enter.
10. Toggle the arrow buttons as needed to select Latching On or Latching Off. With latching on, the alarm remains on even after its trigger is removed (e.g., after the temperature is reduced from an over-maximum condition). In this state, the Alarm button must be pressed to silence the alarm.
11. Press Enter.
12. Enter a numeric dead band value in the same units as the trigger point(s), then press Enter. The dead band is a range of values just less than the maximum trigger point, and duplicated as the same range just greater than the minimum trigger point. A triggered alarm does not deactivate until the control parameter has exited the dead band adjacent the violated extreme.
13. Toggle the arrow buttons as needed to select Alarm Setpoint On or Dead Band.
14. Press Enter.
15. Toggle the arrow buttons as needed to select Audible Alarm On or Audible Alarm Off.
16. Press Enter.

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