Waste Module Cleaning; Enzyme Probe Cleaning - Xylem YSI 2500 User Manual

Enzyme Probe
Unscrew and remove the enzyme probes and the temperature probe from the sample module.
Remove the sample module. Remove and discard the small magnetic stir bar inside the module. Immerse the module in
the authorized disinfecting agent (see Section 8.1) for a maximum of 10 minutes. If soiling or residue is visible, the module
may be immersed in a water filled room temperature sonification bath for a maximum of 10 minutes. After cleaning, rinse
the module for 3 to 5 minutes with authorized rinsing agent (see Section 8.1). Wipe dry with a lint-free tissue.

8.4.2 Waste Module Cleaning

Unscrew the three hex screws from the top of the waste module. Disconnect the calibrator and waste tubing and remove
the waste module from the base plate.
Immerse the waste module in authorized disinfecting agent (see Section 8.1). After cleaning, rinse the module for 3 to 5
minutes with authorized rinsing agent (see Section 8.1). Wipe dry with a lint-free tissue.
Remove the O-ring from the base plate. Clean up any salt deposits or fluid on the base plate. Be sure that the base plate
and all other parts are dry.

8.4.3 Enzyme Probe Cleaning

With normal use, enzyme sensors may become fouled and cease to operate normally. A fouled sensor's output current
will decrease and calibration may become unstable. Follow the steps below to clean the probes.
Figure 8-1
Figure 8-2
8-4
Thumbnuts
Enzyme Probe
Sample module
Allen Screws
Waste Module