
8
8
8
8----4
4
4
4
3. Prepare a small amount of 0.5% sodium hypochlorite solution.
4. Immerse the sensor in the solution for 30 - 45 seconds. Check
periodically...sensor should darken, but do not allow it to become black.
5. Remove the sensor and immediately rinse it with reagent water for at least 2
minutes.
6. Install a new membrane and return the probe to service.
The procedure below is only recommended as a last resort for revitalizing a
sensor after the above cleaning procedure has been unsuccessfully attempted.
WARNING: The following procedure may cause
permanent damage to the enzyme sensor.
1. Using a clean new pencil eraser, carefully, rub the center electrode
(platinum) of the sensor. Do not rub the epoxy between the two electrodes
or the outer silver electrode.
2. To remove any eraser dust or residual, rinse sensor with 70% isopropyl
alcohol and then reagent grade water.
3. Prepare a small amount of 0.5% sodium hypochlorite solution.
4. Immerse the sensor in the solution for about 45 seconds.
5. Remove the sensor and immediately rinse it with reagent grade water for at
least 2 minutes.
6. Install a new membrane and return the probe to service.
NOTE:
NOTE:
NOTE:
NOTE: Several hours may be required for the sensor to stabilize after cleaning.
8.6 Tubing Replacement
The buffer and reference solutions are moved through the SPORT with
peristaltic tubing pumps. Tubing life depends on how much the instrument is
used. Replace all of the SPORT tubing at least every 6 months. Any tube that
becomes loose at the fittings should be replaced immediately.
Remove the screws holding the buffer and calibrator pump to the case panel.
Disconnect and remove all the instrument tubing. New tubing is supplied in the
Preventive Maintenance Kit. Connect the new tubing as shown in Figure 8-1.
When installing new pump tubing, first thread the tube through the pump head
and install the roller assembly (see Figure 8-2). It will help to twist the roller
assembly as you install it. It should snap into place. Remount the pump to the
case panel. Remember to install the tube bushings on both the inlet and outlet
side of the pumps.
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