MAINTENANCE ST100A Series Flow Meter
90 Fluid Components International LLC
Power Fuse Replacement
Make sure system power is OFF before replacing the fuse.
Input power overload protection is provided by a clip-mounted SMT fuse. Table 26 below summarizes the ST80/ST80L power fuse. Open
the blind lid (refer to instructions in Accessing the I/O Connectors, page 22) to access the power fuse. The fuse is on the opposite side of
the P1 power connector near the edge of the power supply board. See Figure 67 below. Although a plastic shield covers this area of the
board, the fuse remains accessible.
Figure 67 – Fuse Location, Power Supply Board
(a) AC Power (b) DC Power
C01425-1-1
SMT Fuse (in clip):
Schurter UMZ 250,
2 A/250 VAC
Power Connector (Opposite Side)
SMT Fuse (in clip):
Schurter UMZ 250,
2 A/125 VDC
Power Connector (Opposite Side)
Checking/Replacing the Fuse
To
check the SMT fuse first turn instrument power OFF. Replace a fuse with obvious damage (e.g., burnt, broken). Take a resistance
reading across the fuse (fuse clip ends). See Figure 67 above. Any reading other than a short (i.e., open circuit) indicates a blown fuse.
Replace with the appropriate Schurter UMZ 250 fuse as listed in Table 26 below. Reinstall the blind lid.
Table 26 – Power Fuse Summary
025806-01 (AC-DC Power Supply)
SMT fuse (in clip), Schurter UMZ 250,
2 A, 250 VAC/125 VDC, time-lag
3404.2419.11 026095-02
025810-01 (DC-DC Power Supply)
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