Mechanical Retraction Assembly PN

MODEL 228

USE OF INSERTION - RETRACTION ASSEMBLIES

MECHANICAL RETRACTION ASSEMBLY (PN 23311-00)

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.

WARNING

Do not loosen cap screws or collar when pressurized.

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.

WARNING

Retraction chamber contents may be under pressure.

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

MILLIMETER

INCH

FIGURE 15. Mechanical Retraction Assembly

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.