The Welker DA-1 Dehydration Assembly is designed to filter, dry, and regulate natural gas or instrument air for use as a pneumatic instrument supply. The system incorporates filters to remove unwanted elements from the instrument supply, as well as regulators to reduce the pressure of the supply prior to entering the instrumentation. This system utilizes a backup filter; when the primary filter requires maintenance, the backup filter is automatically placed into operation to prevent interruptions of operation.

The system may also be equipped with an optional gauge and relief valve that can be used to monitor the pressure of the pneumatic supply in the system. A drip pot upstream of the primary filter and a second filter downstream of the primary filter are options that can be added for increased liquid removal from the pneumatic supply. This additional free liquid removal will decrease the frequency of maintenance required for the filter cartridges.