Hach-Lange SC 100 - Manual (Page 41)

Maintenance
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Section 5 Maintenance
DANGER
Only qualified personnel should conduct the maintenance tasks described in this section
of the manual.
DANGER
Do not replace any component unless power to all electrical circuits to the Controller have
been switched off and the area is known to be non-hazardous.
5.1 Cleaning the Controller
With the enclosure securely closed, wipe the exterior with a damp cloth.
5.2 Fuse Replacement
The instrument contains two mains fuses. Failed fuses are an indication that an equipment
problem could exist. Problem resolution and fuse replacement should be performed only by
qualified service personnel. Refer to
Figure 24 and the following steps to replace the fuses:
1. Disconnect power to the controller (including power to relays and other components,
if powered).
2. Open the hinged controller cover by completely loosening all four captive screws in the cover.
3. Remove the high voltage barrier; pull out on the lever of the captive fastener then pull straight
out on the barrier. Set the barrier aside for reinstallation.
4. Remove the fuses and install new fuses of the same type and rating:
• AC Powered sc100: T, 1,6 A, 250 V, slow blow
• 24 V DC powered sc100: T, 3 A, 250 V, slow blow
5. Reinstall the high voltage barrier.
6. Close the controller cover and hand-tighten the four screws.
7. Reconnect power to the instrument.