Appendix B. Optional Enclosures
42 DigitalFlow™ Multipurpose Ultrasonic Liquid Flowmeter Service Manual
B.3 Rack Mount Fuse Replacement
If it has been determined that the fuse in the Model DF868 requires replacement, refer to Figure 10 on page 49 and
Figure 11 on page 50, and complete the following steps:
1. On the rear panel of the meter, set the power switch to the OFF position and pull the power cord out of its
receptacle.
WARNING! The main power to the Model DF868 must be disconnected before proceeding.
2. Locate the black plastic fuse cover on the back panel at the bottom of the power cord receptacle and pull it straight
out.
3. Replace the defective fuse with a new one of the same rating and type. Use only 5 x 20 mm Slo-Blo fuses, having a
rating as indicated in Table 8 below and on the rear panel label.
4. Reinstall the black plastic fuse cover and insert the power cord back into the receptacle. Then, position the power
switch in the ON position.
The Model DF868 flowmeter may now be placed back into service. Reconnect the main power and resume taking
measurements.
Note: Be sure to record the fuse replacement in Appendix A, Service Record.
Table 8: Line Voltages & Fuse Ratings
Line Voltage Fuse Rating
100-120 VAC 1.0 A, Slo-Blo
220-240 VAC 0.5 A, Slo-Blo
12-28 VDC 3.0 A, Slo-Blo
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