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Page 50 SMD Series Dehumidifying Dryers
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!
• Check the gasket for damage. A damaged gasket allows
contaminants into the process. Replace as needed.
8-3 Servicing the Dew Point Monitor
The accuracy of the dew point monitor on mini dryer 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.
Once every six months, 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!
8-4 Replacing the Process Heater
The SMD Series dehumidifying dryers utilize a single-phase
Calrod-type heater element. This heater element is mounted in the
center compartment. Although the replacement procedure is the
same for each heater, the wattage varies by model, voltage,
temperature range, etc.
WARNING!
HAZARDOUS ELECTRICAL CURRENT PRESENT.
Disconnect and lock out power before you replace
heater elements!