Data Sheet

Level Instruments
D103219X012
Product Bulletin
11.2:Level
February 2015
12
Pneumatic Liquid Level
Instruments
Fisher 2500 controllers and transmitters (figures 12
and 13) are rugged, dependable, and simply
constructed pneumatic instruments. In conjunction
with a 249 sensor, they sense liquid level or interface
level in a vessel, and produce a standard pneumatic
output signal proportional to the process variable.
Standard or Custom Configuration... The 2500
controller in combination with a 249W sensor enables
users to install pneumatic level controllers to a variety
of industry standard or custom process vessel
connections. The sensor consists of a wafer body,
torque tube assembly and displacer and is rated for
CL150, 300, and 600. The wafer body mounts between
NPS 3 or 4 raised face flanges. Custom configurations
are also available to meet your specific application
requirements. Refer to the 2500 specifications in
tables 9, 11, 12, and 13, and the 249 specifications in
tables 4, 5, 6, 7, 8, and 9.
Easy Adjustment... Simple dial‐knobs make set point
and proportional valve opening changes
straightforward and easy.
Simple, Durable Construction... Few moving parts are
used. Knife‐edged driver bearing in sensor, and plated
brass instrument case ball bearing for torque tube
rotary shaft help provide low friction operation.
Reduced Maintenance and Operating Costs...
Spring‐out wire provides for in‐service cleaning of relay
orifice. Supply pressure conservation is enhanced
because relay exhaust opens only when output
pressure is being reduced.
Figure 12. Fisher 2500 Controller in Combination with a 249W Sensor— Installed in a Typical
Customer‐Supplied Cage
W8679