Emerson Fisher S202 User Manual

S201 and S202 Series
D400007X012
Instruction Manual
Form 5171
October 2009
www.emersonprocess.com/regulators
S201 and S202 Series Gas Regulators
Fisher
®
regulators must be installed,
operated, and maintained in accordance
with federal, state, and local codes, rules
and regulations, and Emerson Process
Management Regulator Technologies,
Inc., instructions.
For LP-Gas service, an approved
regulator (such as one listed by U.L.)
should be used. The installation,
in most states, must comply with
NFPA standards.
If the regulator vents gas or a leak
develops in the system, service to
the unit may be required. Failure
to correct trouble could result in a
hazardous condition.
Call a gas service person to service
the unit. Only a qualied person must
install or service the regulator.
!
WARNING
Figure 1. Typical S200 Gas Regulator
W1919
Introduction
Scope of the Manual
This instruction manual provides instructions for
installation, adjustment, maintenance, and parts
ordering information for Types S201, S201H, S201K,
S202, and S202H gas service regulators.
Description
S201 and S202 Series regulators are typically
installed on industrial and commercial applications.
The Types S202 and S202H regulators contain an
internal relief valve. Units with an “H” or “K” sufx
are similar to the basic regulators but deliver a higher
outlet pressure of 1 to 5 psig (69 mbar to 0,35 bar) and
2 to 10 psig (0,14 to 0,69 bar), respectively.
Specications
The Specications section lists the specications for
the regulators. The following information is stamped
on the regulator at the factory: type number, date of
manufacture, spring range, orice size, maximum inlet
pressure, maximum operating outlet pressure, and
outlet pressure which may damage regulator parts.

Emerson Fisher S202 Specifications

General

Brand	Emerson
Model	Fisher S202
Category	Controller
Language	English

Summary

Installation Guidelines and Warnings

General Installation and Safety Warnings

Highlights critical safety warnings for installation, emphasizing proper protection, vent handling, and potential hazards.

Vent Pipe Protection and Drainage

External Overpressure Protection

Stresses the need for external overpressure protection when inlet pressure exceeds regulator limits or could damage downstream equipment.

Startup Procedures and Precautions

Startup Pressure Monitoring

Emphasizes using pressure gauges to monitor downstream pressure during startup, especially with bypass systems.

Regulator Startup Steps

Provides a step-by-step guide for bringing the regulator into operation, including opening valves and checking for leaks.

Adjustment and Shutdown Procedures

Outlet Pressure Adjustment

Shutdown Procedure

Outlines the correct sequence for shutting down the regulator to safely vent pressure and prevent damage.

Maintenance and Disassembly

General Maintenance and Safety

Warns against attempting maintenance without isolating pressure and highlights the need for periodic inspection.

Diaphragm Replacement Steps

Valve Disk and Orifice Replacement