Maintenance
Maintenance
Page 140
50081_Maintenance.fm
9.2 Maintenance Intervals
9.3 Replacing the Fuse
The AutoCAT 9000 is protected by both primary (user-serviceable) and secondary
(factory-serviceable only) fuses.
The primary fuse is installed in a holder located above the instrument power cord
receptacle (see Section 2 Instrument Assembly, Figure 3 on page 19). To inspect or
replace the primary fuse, perform the following steps:
1. Disconnect the power cord from the instrument.
2. Use an object with a fine point (e.g., a ball-point pen) to push inward on the retaining
tabs located on the sides of the fuse holder. The fuse holder will be pushed outward
slightly once the tabs have been disengaged.
3. Pull the holder outward and remove it from the instrument.
4. Inspect the fuses. If either fuse is no longer serviceable, replace with the provided
spare (part no. 50082-70), or with one of the same type and rating (Time delay, 1 A,
250 V).
5. Replace the fuse holder. Ensure that it is oriented correctly, and that the retaining tabs
are engaged.
Note: Replacement of the circuit board-mounted secondary fuses requires the instrument to be
returned to the manufacturer for service.
Table 4 Maintenance Tasks and Schedule
Maintenance Task Frequency
Check the level of titrant in the titrant bottle and refill or replace if necessary. Daily
Remove any air bubbles from the burette by performing the flush procedure (Titrants menu>Burette
functions>Flush).
Daily
Check electrode and titrant status. Recalibrate the titrant if necessary. Daily
Rinse the electrode, temperature probe, and plastic anti-diffusion tip with deionized water before and after each
use.
Daily
Check the piston plunger in the burette for leakage. Weekly
Check to see if burette leaks. Replace burette if leaks are present. Weekly
Replace the burette. Annually
Replace the delivery tubing and plastic anti-diffusion tip assembly. Annually
Contact your Hach representative for instrument software updates. Annually
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