MODEL 228 | USE OF INSERTION - RETRACTION ASSEMBLIES |
REPLACING SEALS IN MANUAL AND MECHANICAL RETRACTION ASSEMBLIES.
1.Retract the sensor into the retraction chamber and fully close the ball valve.
2.Drain the retraction chamber contents using the 1/8 in. flush ports.
WARNING
Retraction chamber contents may be under pressure.
3.(Mechanical) Mark the location of the nut housing cap and retraction collar on the sensor tube. Remove both socket head cup screws from the nut housing and loosen the retraction stop collar.
4.Remove the 3 in. Hex Union nut.
5.Withdraw the sensor from the retraction chamber.
6.Open the junction box and disconnect the sensor wires from the terminal block.
7.Remove the compression fitting just below the junction box and remove the junction box from the sensor tube.
8.(Manual) Pull down the nut guard and remove the collet nut from the bushing housing.
9.Slide all hardware including the bushing housing off the sensor tube.
10.Remove the retaining ring from the bottom of the bushing housing.
11.Remove the Teflon guard.
12.From the top of the bushing housing press out the Teflon bushing. This will also push out the Teflon cup seal.
13.Replace all damaged parts with replacement parts from Figure 16 or 17. Replace the sensor tube if the surface is damaged. A rough or uneven surface will prevent the Teflon cup from sealing.
14.Rebuild the bushing housing. The open end of the cup seal (spring visible) faces the process.
15.Carefully slide the bushing housing onto the sen- sor tube. Do not damage the Teflon bushing or the Teflon cup seal.
16.(Manual) Slide the 3 in. Hex Union nut, collet nut with nut guard, junction box compression nut, and plastic ferrules onto the sensor tube.
17.(Mechanical) Slide the 3 in. Hex Union nut, retrac- tion stop collar, junction box compression nut, and plastic ferrules onto the sensor tube.
18.Connect the junction box to the sensor tube and wire the sensor leads to the appropriate terminals.
19.(Mechanical) Lock the retraction stop collar into position (see Figure 15 or previously marked posi- tion for proper location).
20.Place the Union nut
21.(Mechanical) Install the nut housing cap (see Figure 15 or previously marked position for proper location).
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