3. From the INPUT/OUTPUT menu, select BLOWBACK.
4. From the BLOWBACK menu, select BlBk Enabled. Select Yes to enable blowback. Also
set the following parameters:
• BlBk Intrvl: Length of time between blowback events (60 minutes
recommended).
• BlBk Period: Length of time blowback is activated (5 seconds recommended).
• BlBk Purge Time: Length of time after blowback is complete before oxygen/
combustibles readings are considered valid (set as required by application).
5. Manually initiate blowback from DIAG/SERVICE. Select BLOWBACK.
3.5.2 Configuring blowback with the Field Communicator -
Fieldbus
Complete the following steps to configure blowback with the Field Communicator using
the Foundation Fieldbus communication protocol.
1. Use the 375 Field Communicator or AMS software to access the Fieldbus menu.
2. From the TRANSDUCER block menu, select Alarm Relay/Blowback.
3. From the Alarm Relay/Blowback menu, select Blowback.
4. From the Blowback menu, select Blowback Enabled. Also set the following parameters:
• Blowback Interval: Length of time between blowback events (60 minutes
recommended).
• Blowback Period: Length of time blowback is activated (5 seconds
recommended).
• Blowback Purge Time: Length of time after blowback is complete before oxygen/
combustibles readings are considered valid (set as required by the application).
• Initiate Blowback: Intiates a blowback event manually.
3.5.3
Configuring blowback with the LOI
Complete the following steps to configure blowback with the LOI.
1. Use the Z pattern to enter the LOI menu tree.
2. From the SYSTEM menu, select Blow Back.
3. From the Blow Back menu, select Blow Bk Enable. Select Yes to enable blowback. Also
set the following parameters:
• Blow Bk Intrvl: Length of time between blowback events. Range is 0 to 32,000
minutes. Default is 60 minutes. 60 minutes is recommended.
• Blow Bk Period: Length of time blowback is activated. Range is 1 to 5 seconds.
Default is 2 seconds. 5 seconds is recommended.
• Blow Bk Purge: Length of time after blowback is complete before oxygen/
combustibles readings are considered valid. Range is 0 to 500 seconds. Default is
88 seconds. Set as required by application.
Configuration and startup
Reference Manual 49
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