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MODEL 228 USE OF INSERTION - RETRACTION ASSEMBLIES
INSTALLATION
1. Thread the sensor cable through the tube into the
junction box. Screw the sensor into the tube. Hand
tighten the sensor an additional half turn once the gas-
ket is seated. See Figure 15.
2. Terminate the sensor wiring in the junction box.
See Figure 13 for wiring details.
3. Using a 1/2 in. (13 mm) socket wrench, retract the
sensor into the retraction chamber.
4. Install the assembly on the 1-1/2 in. NPT full port
ball valve mounted in the process line or vessel.
5. Tighten the union nut.
6. Open the ball valve and check for leaks.
7. Using a 1/2 in. (13 mm) socket wrench, insert the
sensor into the process line or vessel.
8. Position the sensor at least 1/2 in. (13 mm) away
from any wall of the vessel or pipe. Set the travel
stop collar “A” next to the nut housing.
RETRACTION
1. Make certain that the system pressure is less than
295 psig (2135 kPa abs) before retracting the sensor.
2. Retract the sensor using a 1/2 in. (13 mm) socket
wrench. When the sensor clears the ball valve,
close the valve.
3. Drain the retraction chamber contents using the 1/8
in. flush ports.
4. Loosen the 3 in. hex union nut, and remove the
retraction stop collar and orange clamp top.
Remove the sensor and tube assembly.
5. Replace the 3 in. hex nut O-ring. Place the sen-
sor and tube assembly back in the retraction
assembly. Replace the retraction stop collar about
1/2 in. in front of the clamp. Tighten the clamp
screws, retraction stop collar, and 3-in. hex union
nut. Verify that the 1/8 in. flush ports are closed.
NOTE
With the ball valve fully closed and the retraction
chamber 1/8 in. flush ports open, some residual
process fluid may leak from the 3 in. hex union nut
female ACME threads. This leakage is normal and to
be expected.
6. Before opening the ball valve, make sure that the
process pressure is less than 295 psig (2135 kPa
abs). Open the valve, check for leaks, and insert
sensor into the process.
FIGURE 15. Mechanical Retraction Assembly
MILLIMETER
INCH
MECHANICAL RETRACTION ASSEMBLY (PN 23311-00)
WARNING
Retraction chamber contents may be under pressure.
WARNING
Do not loosen cap screws or collar when pressurized.