Emerson Fisher 249 249B 249BF 249C 249K & 249L Owner's Manual

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Fisherr 2500‐249 Pneumatic Controllers and
Transmitters
Typical caged and cageless sensor/instrument
configurations are shown below and in figure 1. Caged
sensors (figure 2) provide more stable operation than
do cageless sensors (figure 3) for vessels with internal
obstructions or considerable internal turbulence.
Cageless sensors are generally used on specific gravity
and interface control applications requiring large
displacers that are more easily accommodated by
flange connections up to NPS 8. The availability of
many different displacer stem lengths permits
lowering the displacer down to the most
advantageous depth in the vessel.
Fisher pneumatic controllers and transmitters are used
wherever rugged, dependable, and simply constructed
displacer‐style pneumatic instrumentation is required
in liquid level, interface level, or density service. The
ruggedness of these products is demonstrated by their
use in many kinds of demanding applications,
including those in the power, chemical process, oil and
gas production, and petrochemical industries.
STANDARD CAGED SENSORS
MOUNT ON VESSEL SIDE WITH
DISPLACER INSIDE CAGE
W8334
W9354‐1
FISHER L3 PNEUMATIC LEVEL CONTROLLER
(2500 CONTROLLER IN COMBINATION WITH A
249W SENSOR) CAN MOUNT ON VESSEL TOP OR
BE INSTALLED IN A CUSTOMER‐SUPPLIED CAGE
W8679
CAGELESS SENSORS CAN MOUNT
ON VESSEL SIDE OR TOP WITH
DISPLACER INSIDE VESSEL
2500-249 Controllers and Transmitters
D200037X012
Product Bulletin
34.2:2500
July 2012