In this example, 6.6 is the temperature taken at the time of the error; 6.6 degrees falls outside of the temperature range that is set in the instrument method in Empower. The temperature was set to 4.0 degrees with a range of +/- 5.0. This range is defined by the set point plus-or-minus one half the value of the alarm band. So if the temperature falls outside the range of 1.5-6.5, an alarm is triggered.
This information is found in the Help section of Empower for the Instrument Method parameters for the ACQUITY Sample Manager:
Specifying temperature limits (alarm bands)
Temperature alarm bands prevent an analysis from proceeding until the column heater and sample manager temperatures are within the limits defined by the bands. Configure each band on the General tab of the sample manager instrument method. To enable the use of an alarm band, select the Alarm Band box, and enter an alarm band temperature range.
The temperature is monitored at the start of the injection, to verify that it is within the set point plus or-minus one-half of the value of the alarm band. If the temperature is within the specified range, the injection proceeds. If the temperature is not within the specified range, the injection does not proceed. Instead, a message appears stating, "Waiting for Column Temperature" or "Waiting for Sample Compartment Temperature". The injection proceeds only when the monitored temperature attains the range defined by the set point plus-or-minus one-half the band.
The temperature alarm bands for the column heater and sample manager work similarly, with the following exceptions:
- For alarm bands associated with the temperature of a column heater, the temperature continues to be monitored throughout the entire sample analysis, to ensure that it remains within the range defined by the set point plus-or-minus one half the value of the alarm band. If the temperature changes so that it is outside this range, data acquisition stops, the column heater stops operating, and a message stating "Column Temperature Range Error" appears.
For alarm bands associated with the temperature of a sample manager, the system does not verify the temperature again until the start of the next analysis.
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