Instruction Manual
D200099X012
249 Caged Sensors
April 2017
4
The Parts List section shows some 249 sizes by construction, standard displacer lengths, and standard materials and
table 1 contains displacer and torque tube materials. However, 249 parts are available in a wide variety of materials of
construction, part dimensions, and other specifications. Contact your Emerson sales office
or Local Business Partner
for assistance in selection of specific materials, dimensions, and specifications.
Table 1. Displacer and Torque Tube Materials
Part Standard Material Other Materials
Displacer 304 Stainless Steel 316 Stainless Steel, N10276, N04400, Plastic, and Special Alloys
Displacer Stem, Driver Bearing,
Displacer Rod and Driver
316 Stainless Steel N10276, N04400, other Austenitic Stainless Steels, and Special Alloys
Torque Tube N05500
(1)
316 Stainless Steel, N06600, N10276
1. N05500 is not recommended for spring applications above 232C (450F). Contact your Emerson Automation Solutions sales office or application engineer if temperatures exceeding this
limit are required.
Educational Services
For information on available courses for 249 displacer sensors, as well as a variety of other products, contact:
Emerson Automation Solutions
Educational Services, Registration
Phone: +1-641-754-3771 or +1800-338-8158
e‐mail: education@emerson.com
http://www.emerson.com/en-us/automation/services-consulting/educational-services
Maintenance
Sensor parts are subject to normal wear and must be inspected and replaced as necessary. The frequency of inspection
and replacement depends upon the severity of service conditions.
WARNING
Always wear protective clothing, gloves, and eyewear when performing any installation operations to avoid personal
injury.
Avoid personal injury or property damage resulting from the sudden release of pressure. Before performing any
maintenance procedure:
Relieve any process pressure in the vessel where the 249 sensor is installed.
Drain the process liquid from the vessel.
Shut off any electrical or pneumatic input to the controller or transmitter attached to the 249 sensor and vent any
pneumatic supply pressure.
Use caution when loosening flange bolting (key 22) or pipe plugs (key 17, 26, or 27).
Remove the controller or transmitter from the torque tube arm (key 3).
Before continuing with any maintenance procedure, be sure the cage (key 1) is also free of process pressure and/or liquid.
Use caution when loosening flange bolting (key 22) or pipe plugs (key 17, 26, or 27).
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.
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