Instruction Manual
D103288X012
249VS Sensor
July 2018
6
The displacer in this unit is a sealed container. If penetrated by process pressure or liquid, the displacer may hold pressure
or hazardous liquid for an extended period. A displacer that has been penetrated by process pressure or liquid may contain:
D
pressure as a result of being in a pressurized vessel.
D
liquid that becomes pressurized due to a change in temperature.
D
liquid that is flammable, hazardous, or corrosive.
Sudden release of pressure, contact with hazardous liquid, fire, or explosion, which might result in personal injury or
property damage, can occur if a displacer that is retaining pressure or process liquid is punctured, subjected to heat, or
repaired.
Handle the displacer with care. Damage to the displacer will decrease its ability to withstand process pressure.
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
Note
Except for gaskets (key 7), trouble symptoms peculiar to specific parts are discussed in the following sections. Each section is
specific to these parts. Gasket failure is indicated by leakage in the gasket area. Every time a gasket is removed, replace it with a
new one upon reassembly.
Refer to figure 8 or 9 for key number locations.
Removing the Displacer and Stem
The displacer (key 9) is a sealed container. If the displacer has been penetrated by process pressure or liquid, it may
hold pressure or hazardous liquid for an extended period.
Process residue buildup on the displacer and stem (key 19) may change displacer weight or displacement. A bent stem
or a dented or corroded displacer can impair performance.
If the displacer rests against the travel stop, appears to be overweight, or causes output drift or other output
inaccuracies, it may have been penetrated by process pressure or liquid. Such a displacer may contain pressure
because it was in a pressurized vessel, may contain process liquid that becomes pressurized due to a change in
temperature, and may contain process liquid that is flammable, hazardous, or corrosive.
WARNING
Sudden release of pressure, contact with hazardous liquid, fire, or explosion, which may result in personal injury or
property damage, can occur if a displacer that is retaining pressure or process liquid is punctured, subjected to heat, or
repaired.
Handle the displacer with care.
Note
On a 249VS with travel stop, the displacer must come out with the torque tube arm (key 1) before being completely disconnected
from the displacer rod assembly (key 14). If separating the displacer and displacer rod, remove the cotter spring (key 8).
