Probe Burnoff Setup

 

When a probe is in a furnace, soot will collect in the end of the probe, which will have a negative effect on the performance of the probe.  Burnoffs are used to clean out the built-up carbon by burning it off of the probe.   Burnoff Time: This is the duration of the burnoff measured in seconds.  SSi recommends a 90 second burnoff, and this will be the default value.  However, it can be adjusted by the operator.  Click on the OK button to set the new value, or click on the Cancel button to cancel.

Rec Wait Time:  The amount of time allotted to allow the probe measurements to return to a stable, accurate range after the burnoff is complete. This is measured in seconds. The control output is held until this time is elapsed. Clicking on the value will allow the user to change the value.

 

Burnoff Interval:  This is the amount of time between the beginning of one burnoff and the beginning of the next scheduled burnoff, in minutes.  Default time for the instrument is 720 minutes (12 hours).  However, the amount of time between burnoffs should be determined by the application. 

 

Burnoff Minimum Millivolts: The minimum measured millivolt tolerance of the probe required to start a burnoff. Clicking on the value will allow the user to change the value.  SSi recommends the millivolt value gets down to 200 mV.

 

Burnoff Maximum Temperature: The maximum measured temperature allowed during a burnoff. If the temperature value is exceeded the burnoff will stop. This is done to help maintain the life and the accuracy of your probe.  SSi recommends a value of 1800 degrees. Clicking on the value will allow the user to change the value.

 

Digital IN 4 Assignment:  The value for the digital input 4 assignment. Clicking on the value will allow the user to change the value, which can be either event or Start Burnoff.

 

Burnoff Minimum Millivolts Alarm Setpoint: The minimum millivolt value that must be reached in order for the “Insufficient mV drop during BO” alarm not to be generated. If the millivolt value does not drop below the minimum, the alarm will be generated.

 

Burnoff Maximum Temperature Rise Limit: The maximum number of degrees that the temperature is allowed to increase before the “Excessive TC rise during BO” alarm is generated.