Teledyne 2020 - Explosion proof thermal conductivity analyzer - Manual (Page 68)

5 Maintenance Model 2020
5-2 Teledyne Analytical Instruments
2 Amplifier output doesn't match test input
3 Both Failed
>3 Open gain resistor
Cell
0 OK
1 Failed (open filament, short to ground, no
power.)
2 Unbalance (deterioration of filaments,
blocked tube)
5.3 Fuse Replacement
The 2020 requires two 5 x 20 mm, 4 A, T type (Slow Blow) fuses.
The fuses are located inside the explosion proof housing on the Electrical
Connector Panel, as shown in Figure 5-1. To replace a fuse:
1. Disconnect the Unit from its power source.
2. Place a small screwdriver in the notch in 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 5-1.
Figure 5-1: Removing Fuse Cap and Fuse from Holder
3. Replace fuse by reversing process in step 1.
Remove Power to the instrument before changing fuses.