Instruction Manual
D200126X012
2502 Controllers
June 2017
2
Introduction
Scope of Manual
This instruction manual provides installation, operating, calibration, and maintenance procedures for Fisher 2502
pneumatic controllers (figure 1) used in combination with Fisher 249 level sensors.
This manual does not include regulator or sensor installation or maintenance procedures. For this information, refer to
the instruction manual for the appropriate regulator and 249 level sensor.
Do not install, operate, or maintain a 2502 controller without being fully trained and qualified in valve, actuator, and
accessory installation, operation, and maintenance.
To avoid personal injury or property damage, it is important to
carefully read, understand, and follow all contents of this quick start guide, including all safety cautions and warnings.
If you have any questions about these instructions, contact your
or Local Business Partner before
proceeding.
Description
The 2502 controller described in this manual provides proportional‐plus‐reset and proportional‐plus‐reset with
differential relief valve control. The controller output is a pneumatic signal that operates a final control element. These
controllers are designed to control liquid level, the level of interface between two liquids, or density (specific gravity).
Each unit consists of a 249 liquid level sensor and a 2502 pneumatic controller.
Refer to the Principle of Operation section for a more comprehensive discussion of how the 2502 pneumatic controller
operates.
Specifications
Table 1 gives general specifications for 2502 controllers.
Educational Services
For information on available courses for the 2502 controller, as well as a variety of other products, contact:
Emerson Automation Solutions
Educational Services - Registration
Phone: 1-641-754-3771 or 1-800-338-8158
E-mail: [email protected]
emerson.com/fishervalvetraining
