Fisher® C1 Pneumatic Controllers and Transmitters0 pages

Product Bulletin

C1 Controllers and Transmitters

34.3:C1
July 2014

D103291X012

Fisherr C1 Pneumatic Controllers and
Transmitters
Fisher C1 controllers and transmitters continue the
tradition of durable and dependable Fisher pressure
instrumentation while addressing air/gas consumption
concerns. The C1 is used wherever durable and
dependable pressure instrumentation is required. The
use of this product in demanding applications, such as
those found in chemical process, gas, and oil
production industries, demonstrates its versatility. The
C1 can reduce steady-state air/gas consumption to as
little as 1/10th that of previous products.
C1 controllers compare sensed process pressure (or
differential pressure) with an operator-adjusted set
point, and send a pneumatic signal to an adjacent
control element that maintains the process pressure at
or near the set point value. C1 transmitters sense
process variables and send out a pneumatic signal,
usually to an indicating or recording device that
directly indicates the process measurement.
Unless otherwise noted, all NACE references are to
NACE MR0175 / ISO15156 & NACE MR0103.

FISHER C1 PNEUMATIC CONTROLLER
YOKE-MOUNTED ON CONTROL VALVE ACTUATOR
n Sour Service Capability—Materials are available for

Features
n Wide Range of Sensing Elements—A Bourdon tube is

available for high pressures or bellows for vacuum
and low pressures. Either kind of sensing element
can be installed in the case with the controller or
transmitter. Two interchangeable ranges of output
bellows and gauges also are available.
n Reduced Air/Gas Consumption—The C1 pneumatic

controller is an energy efficient choice, helping to
improve profits and uptime. Steady-state
consumption rate is less than the 6 scfh
requirement set for the oil and gas industry by the
US Environmental Protection Agency (New Source
Performance Standards Subpart OOOO,
EPA‐HQ‐QAR‐2010-0505).

www.Fisher.com

applications handling sour process fluids. These
constructions comply with the metallurgical
requirements of NACE MR0175 / ISO15156 & NACE
MR0103. Environmental restrictions may apply.
n Mounting Versatility—Install the case on a panel,

wall or pipestand, as well as directly on the control
valve actuator.
n Reduced Maintenance Costs—A spring-out cleaning

wire, shown in figure 4, provides for in-service
cleaning of the relay orifice.
n Proportional-Only, Proportional-Plus-Reset, and

Differential Gap Configurable—The C1 controller
can be configured to provide various modes of
control.
(Features continued on page 3)