Dwyer DPM - Manual (Page 28)

Particulate Monitoring Systems
Installation & Operating Manual
Document No. 210-1003-M Page 21 ©2007
PARTICULATE READING GUIDE FOR FABRIC FILTERS
• The guide below is only an approximate guide for modern, highly-efficient baghouses
• With larger or older baghouses, readings can be significantly higher than the ranges shown below
• Shaker and reverse air baghouses will have higher peak readings as compared to pulse jet
• Readings tend to be higher when new filters are installed and a filter cake has yet to form
• With small cartridge filters, the readings tend to be at the lower end of the ranges
• Readings tend to also be lower with highly-efficient filter media such as Gore-Tex® fabric (Gore-
Tex is a registered trademark of W.L. Gore & Associates.)
•
_ ALARM LEVELS FOR EPA COMPLIANT LEAK DETECTION
• Alarm levels for EPA compliant leak detection such as MACT regulations should initially be set as
low as possible until sufficient trend data has been logged and all considerations have been made.
• Do not increase the alarm levels without proper justification.
• Documentation of properly determined alarm levels is recommended as well as locking out alarm
set point adjustment except to authorized personnel.
• Consult factory for alarm set point assistance and or FilterWare Visualization and EPA Compliance
Software for advanced alarming and alarm record keeping.
Typical Readings and Guide for New Efficient Fabric Filters
AVERAGE
BASELINE READINGS
PEAK READINGS
(after cleaning cycle)
FILTER CONDITION
1 – 10 pA Less than 50pA No significant emissions
10 – 100 pA Less than 500pA Onset of emissions
100 – 1000pA Greater than 500pA Significant emissions present
IMPORTANT
IMPORTANT