RKI Instruments Digester Gas Monitor - Manual (Page 94)

88 • Replacing the AC Fuses Digester Gas Monitor Operator’s Manual
5. Locate the water trap. It is located along the middle left of the flow assembly.
6. The fitting at the bottom of the water trap has a nut and a hex. The hex is positioned
above the nut. Use a 9/16 inch open-end wrench or an adjustable wrench to hold the
hex in place. Use a second 9/16 inch open-end wrench of adjustable wrench to
unscrew the nut. The line leading to the bottom of the water trap includes flexible
tubing. Once the nut is loose, move the nut and tubing out of the way. The nut will
slide down the tubing leaving the ferrules at the end of the tubing exposed. The
ferrules should not come off.
7. Grasp the glass bowl of the water trap and unscrew it from the water trap lid. Be sure
the O-ring that seals the glass bowl does not come out of the lid.
8. Unscrew the filter element holder from the water trap lid.
9. There is a circular, black deflector that may come out when you remove the filter
element holder. It has ridges along the outside edge. Do not lose the deflector.
10. Remove the cylindrical water trap element.
11. Install a new filter element onto the filter element holder being sure that the grooved
side of the element is facing down and gets inserted into the holder. The exposed end
of the filter element should be smooth.
12. If the deflector came out when you removed the filter element holder, install it on top of
the filter element being sure that the deflector is curving down toward the filter
element.
13. Screw the filter element holder back into the water trap lid.
14. Screw the glass bowl back into the water trap lid.
15. Insert the tubing with the ferrules into the fitting at the bottom of the water trap and use
a 9/16 inch open-end wrench or adjustable wrench to tighten the nut while using a
second 9/16 inch open-end wrench or adjustable wrench to hold the hex still.
16. Turn the regulator knob clockwise to set the sensor flow to 3 SCFH when you restart
the system.
Replacing the AC Fuses
The Digester Gas Monitor has two user serviceable AC fuses.
1. Turn off or unplug all incoming power to the Digester Gas Monitor.
2. Open the Digester Gas Monitor housing door, then place the power switch in the OFF
position.
3. The fuses are located to the left of the AC in terminal strip. Use a flat-blade
screwdriver to rotate the applicable fuse holder 1/4 turn counterclockwise. The fuse
holder releases from the socket.
4. Remove the fuse holder from the socket, then remove the fuse from the fuse holder.
CAUTION: Verify that the replacement fuses are the same type and rating as the fuses
you are replacing. The Digester Gas Monitor’s fuses are fast blow fuses
rated for 6A, 250 V.
5. Install the replacement fuse in the fuse holder, then place the fuse holder in the
socket.
6. Push the fuse holder into the socket, then turn the holder 1/4 turn clockwise to secure