Teledyne 3350 - Microprocessor based control room monitor for personnel safety - Manual (Page 34)

5-2
5 Maintenance Model 3350
Teledyne Analytical Instruments
3. Insert a small flat-blade screwdriver into the slot in the receptacle at
the end of the power module and gently pry open the fuse
receptacle. The fuse holder will slide out. There are two fuses in use
and are visible in the clip.
4. Remove the bad fuse and replace it with a 5x20mm 0.5 A,
250 VAC, type T fuse(P /N F1130).
5. Replace the fuse holder into its receptacle, pushing in firmly until it
clicks.
5.1.2 AC With Battery Backup Version
1. Disconnect the AC power and place the power switch, located on
the rear panel of the control unit, in the O position.
2. Place a small screwdriver in the notch of the fuse holder cap, push in
and rotate 1/4 turn. The cap will pop out a few millimeters. Pull out
the fuse holder cap and fuse, as shown in figure 5-2.
Figure 5-2: DC Battery Backup Fuse Replacement
3. Replace fuse by reversing process in step 1, by removing the bad
fuse and replace it with a 5 x 20mm 0.25A, 250VAC, Type "T" fuse
(P/N F1128) and 0.50A, 250VAC (P/N F1358).
5.2 Sensor Installation or Replacement
5.2.1 When to Replace a Sensor
The Micro-Fuel Cell typically provide almost constant output through their
useful life, and then fall off sharply towards zero at the end. You will find that
very little adjustment will be required to keep the analyzer calibrated properly
during the duration of a given cell’s useful life.
If large adjustments are required to calibrate the instrument, or calibration
cannot be achieved within the range of the
Δ∇ buttons, the cell may need replac-
FUSE
0.50 AMP
FUSE
¼ AMP