MODEL 228
RETRACTION
1.Make certain that the system pressure is less than 35 psig (342 kPa abs). Push in on the sensor using the top of the junction box. Slowly loosen the collet nut.
WARNING
Severe impact injury can occur if the collet nut is loosened under pressure.
2.When the collet nut is loose enough, slowly ease the sensor back so that it clears the ball valve. Close the valve to the process line.
3.Drain the retraction chamber contents using the 1/8 in. flush ports.
4.Loosen the 3 in. hex union nut. Remove the sensor and tube assembly.
5.Replace the 3 in. hex nut
NOTE
With the ball valve 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 35 psig (342 kPa abs). Open the ball valve and check for leaks. Insert the sensor into the process. Tighten the collet nut.
WARNING
Retraction chamber contents may be under pressure.
USE OF INSERTION - RETRACTION ASSEMBLIES
MILLIMETER |
INCH |
FIGURE 14. Manual Retraction Assembly
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