Yokogawa PR10 Retractable Assembly - Manual (Page 17)

17
IM 12B6K3-01E-E
FIG. 12 Drain Port Connection FIG. 13 Flush Port Connection
4. MAINTENANCE
CAUTION
Retract/ insert at P < 5 Bar. Do not stand
behind immersion tube while retracting/
inserting
4.1 General
Before the sensor can be serviced, the probe
with the sensor inside should be physi-
cally separated from the process. The PR10
retractable fitting can be retracted from its
measuring position in the maintenance posi-
tion by following the five step procedure men-
tioned in paragraph 4.2 in reverse order.
4.2 Probe insertion
1 Position the probe for insertion.
2 Turn the T-bar key clockwise.
3 Open the ball valve.
4 Push the probe into the process.
5 Fix the probe by turning the fixing screw
clockwise.
4.3 Taking out the sensor
Retract the probe from the process
according to the following procedure:
• Release the fixing screw.
• Pull out the probe.
• Close the ball valve (*).
• Turn the T-bar counter clockwise
• Take out the probe.
* If the option provides a drain port, the
process pressure can be relieved before
removing the sensor.
• Stand clear when releasing the fixing
screw! Due to the process pressure the
probe can be pressed out.
• The T-bar key can only be operated when
the ball valve is closed. Make sure it is closed
completely.
• The friction of the O-rings will slow down
the probe when it is retracted.
4.4 Replacing the sensor
Refer to paragraph 3.8
4.5 Replacing the sealings
For prevention of leakage due to aging
of the seals, the O-ring seals may need
replacement. Hereto, follow the procedure
below.
Procedure:
Remove the probe from the process. Follow
the procedure described in paragraph 4.2
Dismount the sensor. Follow the procedure
described in paragraph 3.8 in reverse order:
• Disassemble the housing of the insertion
tube.
• Replace the o-rings with the proper tools
(like K1525AF).
4.6 Drain ports connection
The PR10 retractable fitting can be
equipped with optional drain (or flush) ports
on the flanged adapter. The drain ports are
tapered 1/8” NPT female for small diameter
connectors.
Adjusting the insertion depth
The insertion depth of the sensor can be
adjusted to your preference. The insertion
stop can be set for the desired insertion
depth, using the key supplied with the fitting.