Instruction Manual
D200100X012
249 Cageless Sensors
December 2012
4
WARNING
Always wear protective clothing, gloves, and eyewear when performing any maintenance operations to avoid personal
injury.
Avoid personal injury or property damage resulting from the sudden release of pressure. Before performing any
maintenance procedure:
D Relieve any process pressure in the process vessel where the 249 sensor is installed.
D Drain the process liquid from the process vessel.
D Shut off any electrical or pneumatic input to the controller or transmitter attached to the 249 sensor and vent any
pneumatic supply pressure.
D Use caution when loosening flange bolting or pipe plugs (key 26).
D Remove the controller or transmitter from the torque tube arm (key 3).
Before performing any maintenance procedure requiring the handling of the displacer, inspect the displacer (key 10) to
make sure process pressure or liquids have not penetrated the displacer.
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. Consider the characteristics of the specific process liquid in use.
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
Note
Except for gaskets (keys 13, 14), trouble symptoms peculiar to specific parts are discussed in the following sections. Each section is
specific to these parts. Regardless of location, gasket failure is indicated by leakage in the gasket area. Every time a gasket is
removed, replace it with a new one upon reassembly.
The procedures below apply to all sensor types except where indicated. Key numbers used are shown in the following
illustrations:
D 249BP—figure 5
D 249CP—figure 6
D 249P—figure 7
D 249V—figure 8
Removing the Displacer and Stem
The displacer (key 10) 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.
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(10 Seiten)
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