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5 Maintenance
Display PCB
Main PCB
Preamp PCB
Door Subassembly
(Cross Section)
Box Subassembly
(Gas Connector Panel
not shown)
Customer Interface Panel
(Electrical Connector Panel)
Figure 5-1: Major Internal Components
To swing open the cover panel, remove all screws.
5.3
Sensor Replacement
The Paramagnetic Sensor is maintenance free, and has a long life.
Should the sensor fail, contact the factory for service and replacement.
5.4
Fuse Replacement
The 3020M 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 5-2. 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 5-3.
5-2
Gas Control Valves
Teledyne Analytical Instruments
24V Sensor Power Supply
located behind Customer
Interface Board.
Sensor
Model 3020M
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