Removing The Filaments; Installing The Filaments; Filament Checkout - ABB PGC5000 Series Service Instructions Manual

PGC5000
PGC5000 Series Service Instructions
It is the customer's responsibility to ensure that the area is safe and hazard free, and will remain so the
entire time the analyzer is open. This responsibility includes ensuring adequate ventilation in analyzer
shelter and obtaining proper work permits, etc.
1. If power is applied to the analyzer, turn it off.
2. Turn off oven air to the Isothermal Oven and allow all temperature zones to cool.
3. Open the isothermal oven door.
4. Isolate carrier and all utility gases

7.3.1 Removing the filaments

1. Use a Phillips screwdriver to loosen the two Phillips head screws located on the front underside of the mounting bracket.
2. Remove the mounting bracket cover by sliding it out and away from the detector assembly.
3. Remove the insulating material from the mounting bracket.
4. If they are not already labeled, label the wire pair connected to the measurement filament "M" and the wire pair
connected to the reference filament "R".
5. If the detector filament wiring connections are spliced, perform steps 6 through 8. If they are not spliced, go to step 9.
6. Position the detector wiring such that the wired splices can be accessed.
7. Cut and remove the heat shrink from each of the spliced filament wire connections to expose the soldered connections.
8. Using a 40 watt soldering iron, de-solder and disconnect the wire splices.
9. If the detector filament wiring connections are not spliced, cut the existing detector harness wires approximately three
inches from the detector end.
10. Remove the harness retaining clamp and free the harness.
11. Clean the area around the two detector filaments to reduce the chance of foreign particles entering the detector cavity
when the filaments are removed.
12. Loosen the two detector filament retaining gland nuts with a 3/8-inch open-end wrench. Continue to loosen by hand.
13. Carefully extract the filaments from the detector cell cavity.

7.3.2 Installing the filaments

Replacement filament installation kits are supplied with two cable glands, a wire spreader, 736 RTV, high
temperature solder, and heat shrink.
1. Cut the four filament wires approximately the same length as the wires on the filaments that were removed.
2. Insert one pair of filament wires through the threaded end of the gland nut, then carefully insert the filament into the
detector cell cavity marked "M" (measurement). Position the filament with filament wire in the direction of the flow.
3. Slide the nut down the length of the wires to insert and align it with the measurement cavity.
4. Tighten the cable gland finger tight, and then finish tightening with a 3/8-inch open-end wrench.
5. Insert the second pair of filament wires through the threaded end of the gland nut, then carefully insert the filament into
the detector cell cavity marked "R" (reference). Position the filament with filament wire in the direction of the flow.
6. Slide the nut down the length of the wires to insert and align it with the reference cavity.
7. Tighten the cable gland finger tight, and then finish tightening with a 3/8-inch open-end wrench.
8. Using wire strippers, remove approximately 1/4 inch of insulation from the end of each detector filament wire.

7.3.3 Filament checkout

1. Connect multimeter leads to each wire of the measurement filament (installed in the detector cavity labeled "M"). The
resistance measurement should be approximately 40 ohms.
2. Connect multimeter leads to each wire of the reference filament (installed in the detector cavity labeled "R"). The
resistance measurement should be within one ohm of the measurement filament resistance.
3. If the resistance measurements are not within one ohm of each other, ensure the multimeter is connected and functioning
correctly, and that the correct meter function is selected.
4. If the detector filaments are not in tolerance, the detector filaments are defective. The filaments must be replaced and
the checkout repeated.
5. Neither filament should contact the detector cell body. Connect the multimeter leads to one of the filament wires and the
detector cell body. The meter reading should range from several hundred megohms to infinity.
SI/PGC5000-EN, Rev B
7 Subassembly repair
57