What should I do if the enzymes are not being drawn properly?

The following are two possible reasons why enzymes may not be drawn from the reservoir.  

(1) The silicone tubes may be worn or flattened from use. To inspect the tubing, refer to TDF Service Procedure Tube Replacement (Pinch Valves) (TS005) and reference the steps starting at step 11, related to performing a "Valve Test." The silicone tubes should be clear and fully opened. If any of the silicone tubes are excessively flattened or stuck in a pinched or closed position on their own (without the pistons pushing against them), then the tubes need to be replaced. A spare set of 3 1/4" silicon tubing was originally sent with the TDF instrument. A set of 21 replacement tubes (3 1/4"), the Pinch Valve Tubing Set (Part #: TDF71) are available for purchase on our website.

It is recommended that all the pinch valve tubing be replaced at the same time to keep on the same maintenance schedule (annually). This would include the IDF, SDF, and Waste pinch valves.  

(2) It is also possible that there is a blockage within the enzyme lines. Visually inspect the tubing from the enzyme reservoirs to the enzyme pinch valve to the manifold. If any crystals or dried enzymes are found, follow the instructions detailed in the Service Procedure Enzyme Line Flush Procedure (TS037) linked below.  

NOTE: It is recommended that when running methods AOAC 2009.01, 2011.25, 2022.01, or 2017.16 the enzyme lines are flushed at the end of each day according to this service procedure. If necessary, replace the enzyme supply tubing by referring to Service Procedure Tubing Replacement (Enzymes).

An Enzyme Tubing Replacement Kit (Part #: TDF67) can be ordered from the ANKOM website.