Siemens 91-HF Manual

INSTALLATION AND SERVICE INSTRUCTION

Siemens Industry, Inc.

UM91-HF

Rev 6

July 2012

Supersedes Rev 5

Model 91-HF

Filter Regulator

INTRODUCTION

The Model 91-HF Filter Regulator removes impurities from an air supply and delivers

an accurate output pressure.

SPECIFICATIONS

Port Size (In, Out and Gauge) ¼" NPT

Output Range 0-120 psig (0-800 kPa)

Max Supply Pressure 150 psig (1034 kPa)

Mounting Pipe or Through Body

Flow Capacity 22 SCFM (33.0 m3/hr) at 100 psig (700 kPa) supply with 20 psig (140 kPa) output

Exhaust Capacity 0.1 SCFM (0.17 m3/hr) with downstream pressure 5 psig (35 kPa) above set point

Sensitivity 1" (2.5 cm) of water

Air Consumption Less than 5 SCFM (0.17 m3/hr)

Effect of Supply

Pressure Variation Less than 0.2 psig (1.4 kPa) for 25 psi (170 kPa) change

Ambient Temp Limits 0° to 160°F (-18° to 71°C)

Weight 1.6 lb (725 g)

MATERIALS OF CONSTRUCTION

Body Diecast Aluminum Alloy, Irridite and Baked Epoxy Finish

Filter 3 Micron Phenolic Impregnated Cellulose

Diaphragm Nitrile Elastomer and Nylon Fabric

Valve Seat Plug Nitrile Elastomer

Additional Materials Brass, Zinc Plated Steel, Acetal

INSTALLATION

Install the regulator as close as possible to the instrument or tool it is to service. For best filter drainage, orient the drain

valve so that it is at the lowest point on the drip-well housing. The words “IN” and “OUT” are cast into the body to indicate

the direction of flow. See Specifications for port size. Installation dimensions are shown on the next page.

UM91-HF

Installation Dimensions

WARNING

As with any pneumatic device, excessive

pressure will eventually cause one or more

components to rupture. Such an event could

cause death or serious injury. To avoid this

possibility, the supply (IN) pressure must not

exceed 150 psig.

IMPORTANT

The Model 91-HF filter regulator has low capacity internal relief,

which provides very limited downstream over-pressure protection.

To avoid exceeding the output pressure limits in service, a pressure

relieving or pressure-limiting device should be provided.

INSTRUMENT AIR REQUIREMENTS

This product is intended for use in industrial compressed-air systems

only. Do not use this product where pressures and temperatures can

exceed those listed under Specifications.

CAUTION

Use of process fluids other than instrument air is not recommended. No claim is made as to the

suitability of this product for use with other process fluids, such as hazardous gases, except as listed

on an appropriate certificate. Non-approved instruments are suitable for use with instrument air

only. Optional features and modifications such as tapped exhaust do not imply suitability for use

with hazardous gases except as listed on an approval certificate.

CAUTION

Synthetic compressor lubricants in the instrument air may cause deterioration of some

components resulting in instrument failure. See materials of construction above.

The requirements for a quality instrument air supply can be found in the Instrument Society of America's "Quality Standard

for Instrument Air" (ISA-S7.3). Basically, this standard calls for the following:

Particle Size — The maximum particle size in the air stream at the instrument should be no larger than 3 microns.

Dew Point — The dew point, at line pressure, should be at least 10°C (18°F) below the minimum temperature to which any

part of the instrument air system is exposed at any season of the year. Under no circumstances should the dew point, at line

pressure, exceed 2°C (35.6°F).

Oil Content — The maximum total oil or hydrocarbon content, exclusive of non-condensable, should not exceed 1 ppm under

normal operating conditions.

UM91-HF

OPERATION

Prior to turning on supply air, back off the adjusting screw until there is no compression of the range spring; refer to

dimension and assembly drawings as needed. After turning the supply pressure on, turn the adjusting screw clockwise to

increase outlet pressure.

MAINTENANCE

1) To remove condensate, slowly open the drain valve and bleed accumulated liquid.

2) To clean the filter element:

a. Shut off supply air.

WARNING

Components can be ejected with great force if the instrument

is disassembled while pressure is applied. To avoid the risk

of death or serious injury, always turn off and vent supply

pressure and any downstream pressure source when

disassembling the instrument.

b. Drain condensate.

c. Remove four corner bolts from the bottom of the unit. Refer to the Assembly Drawing as needed.

d. Remove drip-well housing and filter.

e. Clean parts and reassemble in reverse order.

Assembly Drawing

UM91-HF

3) To install replacement parts:

a. Order repair kits; see the assembly drawing for part numbers.

b. Shut off supply air. Back out the adjusting screw.

c. Remove four corner bolts from bottom of unit and four screws on the top. Remove all parts.

d. Replace all parts that show excessive wear.

e. Clean all parts and replace in the reverse order.

CUSTOMER/PRODUCT SUPPORT

For support and the location of your local Siemens representative, refer to the table below for the URL of the Process

Instrumentation (PI) portion of the Siemens public Internet site. Once at the site, click Support in the right column and then

Product Support. Next select the type of support desired: sales, technical (see the table below), documentation, or software.

Online Support Request http://www.siemens.com/automation/support-request

Technical Support 1-800-333-7421; 8 a.m. to 4:45 p.m. eastern time, Monday through Friday (except

holidays)

Customer Service & Returns 1-800-365-8766 (warranty and non-warranty)

Public Internet Site http://www.usa.siemens.com/pi

Technical Publications

in PDF Click the above link to go to the Siemens Internet site and then click Process

Instrumentation. In the column to the right, click Support > Manuals. In the

column to the left, select the product line (e.g. Pressure or Temperature or

Controllers) to open navigation and search panes. Note: Navigation may change as

the site evolves.

Warranty

The sales contract contains the entire obligation of Siemens. The warranty contained in the contract

between the parties is the sole warranty of Siemens. Any statements continued herein do not create new

warranties or modify the existing warranty.

All product designations may be trademarks or product names of Siemens Industry, Inc. or other supplier companies whose use by third

parties for their own purposes could violate the rights of the owners.

Siemens Industry, Inc. assumes no liability for errors or omissions in this document or for the application and use of information in this

document. The information herein is subject to change without notice.

Procedures in this document have been reviewed for compliance with applicable approval agency requirements and are considered sound

practice. Neither Siemens Industry, Inc. nor these agencies are responsible for product uses not included in the approval certification(s) or

for repairs or modifications made by the user.

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