American Dryer Corp. AD-840 - Manual (Page 28)

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Telephone: (508) 678-9000 Fax: (508) 678-9447
4. Find the temperature correction factor (TCF) from Table 1 on page 26.
5. The base flow rate can be calculated as follows:
BASE FLOW RATE = (TIME IN SECONDS TO
FILL ONE GALLON)/(TCF)
EXAMPLE: TCF from table for 68º F is 1.19 and it
takes 71 seconds to fill a gallon
base flow rate = 59.66
The base flow rate is the flow rate during the first 24 to 48 hours of the operation of a new membrane and
machine. It may be different for every membrane. Write down the base flow rate for your particular
machine on your maintenance sheet.
6. We recommend that the product water flow be checked every two (2) months. Follow steps 1
through 4 and obtain a new TCF and a new time (in seconds) to fill one (1) gallon. With the new
TCF find the cleaning limit. The membrane needs cleaning when the new time to fill one (1) gallon
exceeds the cleaning limit.
CLEANING LIMIT = (new TCF) x (BASE FLOW RATE) x 1.17
EXAMPLE: If the new temperature is 79º F and it now takes 63 seconds to fill a gallon,
TCF from Table 1 for 79º F is 0.97 and from the above example, the base flow
rate for our membrane is 59.66,
cleaning limit = 0.97 x 59.66 x 1.17
= 67.71
Since it only takes 63 seconds to fill one (1) gallon (less than cleaning limit of
67.71), cleaning is not required yet. It would, however, be prudent to order the
cleaning kit at this time.