249W Level Sensor
Instruction Manual
Form 5729
March 2005
13
Parts Ordering
Whenever corresponding with your Fisher sales
office about this equipment, always mention the
sensor serial number. Each sensor is assigned a
serial number which is stamped on a nameplate (key
21) attached to the torque tube arm. This same
number also appears on the controller/transmitter
nameplate when a complete controller/transmitter/
sensor unit is shipped from the factory. When
ordering a replacement part, be sure to include the
11-character part number from the following parts
list.
Note
Use only genuine Fisher replacement
parts. Components that are not
supplied by Fisher should not, under
any circumstance be used in any
Fisher instrument. Use of components
not supplied by Fisher will void your
warranty, might adversely affect the
performance of the valve, and might
jeopardize worker and workplace
safety.
Determining Displacer Stem Length
When ordering a displacer stem, determine the
displacer stem length from the G dimension in
figures 8 and 9, cage styles 3 and 4. For cage styles
1 and 2, the G dimension is typically 0, so no stem is
required.
The stem length will be the G dimension rounded to
the nearest 1/2-inch increment. For example, if
dimension G is 12.63 inches, round it to 12.5 inches.
Specify a stem length of 12.5 inches. If dimension G
is 9.44 inches, round it to 9.5 inches. Specify a stem
length of 9.5 inches.
Stem lengths can be adjusted approximately
±
0.25
inches for a more exact dimension. Stems are
available in 1/2-inch increments from 2 to 54 inches.
Note
Neither Emerson, Emerson Process
Management, nor Fisher assume
responsibility for the selection, use, or
maintenance of any product.
Responsibility for proper selection,
use, and maintenance of any Fisher
product remains solely with the
purchaser and end-user.