Emerson Rosemount 402 Quick Start Manual page 12

Installation
May 2019
2.1.2 Retraction
1.
2.
3.
4.
5.
IMPORTANT
Failure to withdraw the sensor completely may result in damage to the electrodes when the valve is closed.
6.
Figure 2-6 Rosemount 402 Contacting Conductivity Sensor in Retracted Position
6
Make sure the system pressure is at or below 542 kPa abs (64 psig) at the valve before
proceeding. Provide adequate working area for retraction.
Unscrew the retainer (5) from the packing adapter (3). If it is difficult to unscrew the
retainer, system pressure may be forcing the clamp (4) into the retainer. The packing
bushing (6) may not be tight enough to hold the sensor tube (9) in place. To prevent a
sudden retraction of the sensor tube as the retainer is removed, hold onto the junction
box (8) or sensor rear to restrain the sensor.
If the sensor tube (9) does not slide back as the retainer is unscrewed, pull back on the
junction box (8) or sensor tube to retract the sensor.
If the sensor tube (9) cannot be retracted, loosen the clamp (4) using the hex key. Pull the
clamp back and slowly loosen the packing bushing (6) in 1/8-turn increments. System pres
sure may cause the tube to retract. If not, pull back on the junction box (8) or sensor tube
(9) to withdraw the sensor.
Withdraw the sensor tube until the guard (10) contacts the stop inside the packing adapter
(3). The electrodes (11) are now inside the packing adapter. See
lock up on the valve handle and close the ball valve (2).
Unscrew the packing adapter (3) from the ball valve (2) to remove the sensor and
retraction assembly.
Quick Start Guide
00825-0100-3402
Figure 2-6. Slide the handle
Installation