Metek 920, Operator'S Manual With Essential Health And Safety Requirements

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5-46 | Model 920 Multi-Gas Analyzer
12. If the Ground wire is damaged, replace it. (Use only 16 AWG High
Temperature wire.) Strip 1/8” insulation from the end of the 30” length
of high temperature wire (P/N 300-4182). Use a crimping tool to crimp
a #8 ring terminal (P/N 300-4182) on the wire. Secure the ring terminal
to the bottom of the Upper Heater Plate with a M4 lock washer (P/N
300-0265) and M4 x 8 screw (P/N 300-0006). Tighten the screw. See
“Detail A” in Figure 5-9.
13. Install a 3/4” anti-short (P/N 300-5292) around all of the wires and into
the bottom hole in the Lower Heater Plate to protect the wires from
damage during handling.
14. Feed the RTD and Heater Element wires (and Ground wire, if re-
placed) through the Lower Heater Plate and Thermal Insulation Tube,
and into the Seal Body.
With the joining surfaces of the Top and Bottom Heater Plates facing
each other, position the wires in the wire channel in the Lower Heater
Plate. Reassemble the two halves of the Heater Plate, being careful not
to pinch any wires between the two plates, and secure them together
with the (8) M6 x 25 screws. Tighten the screws.
15. Reinstall the Heater Plate in the Oven:
Slightly loosen the Seal Body gland nut (inside the Electronics
Enclosure) and tilt the top of the Heater Plate toward the back of the
Oven.
OPTIONAL
If the entire Heater Plate was removed from the Oven to work on it,
reassemble Heater Plate (see Step 14 for important information about
reassembling the Top and Bottom Heater Plates).
With the top of the Heater Plate tilted toward you, place the bottom of
the Heater Plate in the bottom of the Over, taking care not to damage
the wires. Tilt the Heater Plate toward the Oven Wall.
Rotate the Seal Body/Thermal Insulating Tube toward the Oven until
the top of the Thermal Insulating Tube is in line with the threaded
holes in the bottom of the Oven.
Guide the wires from the Heater Plate through the Thermal
Insulating Tube and into the Seal Body.
Ensure the threads of the Thermal Insulating Tube are clean and then
thread the tube back into the Heater Plate, taking care not to cross-
thread the threads. Tighten the tube until an increase in resistance is
felt. Do not overtighten it.
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NOTE