4194A, B, and C Series
1–3
Section 1
Introduction
Scope of Manual
This instruction manual provides installation, operat-
ing, calibration, maintenance, and parts ordering in-
formation for the 4194A, 4194B and 4194C Series dif-
ferential pressure indicating controllers.
Portions of this manual apply only to specific configu-
rations in the 4194 Series controller configurations.
These configurations are indicated by letter suffixes in
the type number that correspond to the mode and op-
tion designated in table 1-2.
The specific controller type number (with letter suf-
fixes) is located on the nameplate shown in figure 1-1.
Refer to table 1-2 for the definition of each 4194 Se-
ries type number.
Only personnel qualified through training or experience
should install, operate, and maintain this controller. If
there are any questions concerning these instructions
contact your Fisher Controls sales representative or
sales office before proceeding.
Description
The controllers described in this manual provide differ-
ential pressure control with options as shown in table
1-2.
D
4194A Series: Proportional-only control
D
4194B Series: Proportional-plus-reset control
D
4194C Series: Proportional-plus-reset-plus-rate
control
These controllers show process differential pressure
and set point on an easy-to-read process scale. The
controller output is a pneumatic signal that operates a
final control element.
Specifications
Specifications for the 4194A, B, and C Series control-
lers are listed in table 1-1.
Figure 1-1. 4194 Series Differential Pressure Controllers
W3358 / IL
W6390 / IL
