Sterlco SDAP 90-225 CFM Series Drying and Conveying Systems - Manual (Page 52)

Page 52 SDAP Series PD 2 to PD 4 Drying and Conveying Systems
Important!
Let the filter dry completely before returning it to service!
A damp filter can contaminate the closed loop system of the dryer.
Do not use a light bulb to dry the filter. You should get satisfactory filtration after second or
third washings; however, dirt-holding capacity of the filter decreases after each washing.
After each cleaning:
• Inspect the filter element. Briefly hold a light bulb behind the element and look
for any fatigued paper or residual dirt. Inspect for holes and tears by looking
though the filter toward a bright light. Check for damaged gaskets or dented
metal parts. Do not re-use a damaged filter!
• Inspect the end plates. Any damage here can allow air to bypass the filter.
• Look for rust on the end plates and metal core. Rust particles can flake off and contaminate
the dryer and resin.
• Check the gasket for damage. A damaged gasket allows contaminants into the process.
Replace as needed.
• Allow the filter to dry before re-using. Circulate warm air at less than 160ºF (71ºC). Do not
use a light bulb to dry the filter.
6-3 Servicing the Dew Point Monitor
The accuracy of the dew point monitor on SDAP cart systems depends on proper operation of
the dew point sensor and the control board. The dew point sensor is in the process air stream and
is therefore susceptible to contamination.
Dew point sensor life depends on:
• Air temperature and flow passing over the sensor.
• The amount of fines (dust) in the process air.
• The amount of plasticizer vapor in the process air.
The dryer operator should monitor the initial dew point sensor readings and establish a periodic
replacement schedule as needed.
Caution!
Do not attempt to check the continuity or resistance of the dew point sensor.
The sensor will be destroyed!