The Fisher Story | 31
Fisher Governor
Foundation builds
the Fisher
Community
Center for the
civic, cultural
and social
uses of the
Marshalltown
community.
Wooden, painted Santa Claus hangs for the first time
between the factory and office building over Center
Street in Marshalltown.
Flow lab in Marshalltown main office building, 1956
n 1930, the Fisher Governor
Company introduced its first
level measuring device, the
Type 246. Using a cantilevered
spring to support the displacer,
this product served liquid level,
level interface or density
applications.
A new rotary shaft concept
replaced the cantilevered spring
and evolved into the first torque
tube design. Patented in 1939,
the torque-tube design was used
in the Type 248 (1942), and the
248 was used with the Type
2400 Level-Trol ® Series. Some
of these 248-2400 pneumatic
level controllers are still in
service today.
The Type 248 torque-tube
assembly was redesigned (1946)
by Verle Hunt and became the
Type 249. The 249 design
remains essentially unchanged
except for a few improvements
to its cages, heads and torquetube arms. The Type 2500 Series
Level-Trols, used with the 249,
provide improved performance
and reliability. The 249-2500
series made the Fisher a leader
in the level controls market.
The Type 2320 (1960), Type
2340 (1970), and Type 2390
(1984) series electronic level
transmitters were introduced
and used with the 249. The
FIELDVUE ® DLC3000 digital level
controller (2000) is the newest
level device.
Level-Trol ® Line
I