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MODEL 228 USE OF INSERTION - RETRACTION ASSEMBLIES
FIGURE 14. Manual Retraction Assembly
MILLIMETER
INCH
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.
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 O-ring. Place the sensor
and tube assembly back in the retraction assembly.
Tighten the 3 in. hex union nut. Verify that the 1/8 in.
flush ports are closed.
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
Severe impact injury can occur if the collet nut is
loosened under pressure.
WARNING
Retraction chamber contents may be under pressure.
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