Murphy L971 Series User manual

L971 Series

■

Durable Low Level Switch

■

Replaces Non-Explosion-proof Switch on

Ingersoll-Rand Compressors

■

Adaptable to Other Compressors

■

Installs with Minimal Downtime

■

Two Year Limited Warranty

Description

The Murphy L971 Series Level Switch detects

low oil level in a compressor’s crankcase.

As oil level in the crankcase depletes, the

float on the L971 switch falls, and if reaches

the predetermined limit, will trip the internal

snap-switch which in turn will initiate a

shutdown and/or alarm.

The L971 is designed for Ingersoll-Rand

Type 30, Type 40 and ESH compressors, yet

can be adapted to fit other compressors that

have an inspection plate extending below

normal operating oil level.

The L971 has a 1/2 NPT process connection

and features an explosionproof enclosure,

durable SPDT snap-switch and rigid

polyurethane foam float. A 304 stainless steel

float is available on certain configurations (see

Specifications).

Specifications

Operating Temperature Range:

-15 to 275°F (-26 to 135°C).

Maximum Working Pressure:

30 psi (206 kPa) [2.06 bar].

Switch Rating: 4 A @ 250 VAC.

Material

Case: Aluminum (explosion-proof).

Mounting Adaptor: Brass.

Floats: Rigid polyurethane. 304 stainless

steel available on L971-C only.

Other Wetted Parts: 303, 304, and

316 stainless steel.

O-Ring Seals: Viton and Buna.

Process Connection: 1/2 NPT.

Enclosure Rating: UL and CSA listed for

Class I, Groups C & D; Class II, Groups F

& G, Hazardous Locations.

Conduit Connection: 1/2 NPT.

Wire: 18 AWG (0.75 mm2).

Shipping Weight: 1 lb. 10 oz. (0.7 kg).

Shipping Dimensions: 8-1/4 x 4-1/4 x

4-1/2 in. (210 x 108 x 114 mm).

Warranty

A limited warranty on materials and workmanship

is given with this FW Murphy product. A copy of

the warranty may be viewed or printed by going to

www.fwmurphy.com/support/warranty.htm.

Wiring Diagrams

Green

Red

Yellow

Red

Green

Black

Yellow

Model L971-A

All Other Models

*Shown in “shelf” position with no force acting upon float.

**Products covered by this bulletin comply with EMC

Council directive 89/336/EEC regarding electromagnetic

compatibility except as noted.

L-7229B

Revised 02-97

Catalog Section 15

(00-02-0059)

Crankcase Level Switch

To order the L971 Series Level Switch to fit your application, use the diagram below.

Example model number: L971-C

L971 – ____

How to Order

Dimensions

TOP TOP

TOP

L971-D and L971-E L971-F L971-G

TOP

21°

TOP

21°

L971-AModel

Case/Float

Configuration

(front view,

less cover

and gasket)

Case/Float

Configuration

(front view,

less cover

and gasket)

NOTE: Switches shown tripped on falling level.

Model

L971 and L971-B L971-C

Float arm is

adjustable but

cannot be

removed.

1/2 NPT

Float is removable

and replaceable

3 in.

(76 mm)

1/2 NPT

ABCDE

L971 2-5/8 (67) 5-7/8 (149) 30 (762) 2-1/2 (64) 2-27/32 (72)

L971-A 2-5/8 (67) 5-7/8 (149) 30 (762) 2-1/2 (64) 2-27/32 (72)

L971-B 4-13/16 (122) 8-1/16 (205) 30 (762) 4-5/8 (117) 2-27/32 (72)

L971-C 2-13/16 (71) 6-1/16 (154) 30 (762) 2-7/8 (73) 3-1/8 (79)

L971-D 3-7/8 (98) 7-1/8 (181) 30 (762) 3-3/4 (95) 2-27/32 (72)

L971-E 4-13/16 (122) 8-1/16 (205) 30 (762) 5-1/8 (130) 2-27/32 (72)

L971-F 2-5/8 (67) 5-7/8 (149) 40 (1016) 2-1/2 (64) 2-27/32 (72)

L971-G 2-5/8 (67) 5-7/8 (149) 40 (1016) 2-1/2 (64) 2-27/32 (72)

*Millimeter dimensions are shown in parenthesis ().

Dimensions in inches

(see drawing right)

Models

Case/Float Configuration (see chart below)

Blank = Standard configuration

A= Configuration A

B= Configuration B

C= Configuration C

D= Configuration D

E= Configuration E

F= Configuration F

G= Configuration G

L-7229B page 2 of 2

CONTROL SYSTEMS & SERVICES DIVISION

P.O. Box 1819; Rosenberg, Texas 77471; USA

+1 281 633 4500 fax +1 281 633 4588

e-mail [email protected]

MURPHY DE MEXICO, S.A. DE C.V.

Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje

San Luis Potosí, S.L.P.; México 78384

+52 444 8206264 fax +52 444 8206336

Villahermosa Office +52 993 3162117

e-mail [email protected]

www.murphymex.com.mx

FRANK W. MURPHY, LTD.

Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.

+44 1722 410055 fax +44 1722 410088

e-mail [email protected]

www.fwmurphy.co.uk

MURPHY SWITCH OF CALIFORNIA

41343 12th Street West

Palmdale, California 93551-1442; USA

+1 661 272 4700 fax +1 661 947 7570

e-mail [email protected]

www.murphyswitch.com

In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time.

MACQUARRIE CORPORATION

1620 Hume Highway

Campbellfield, Vic 3061; Australia

+61 3 9358 5555 fax +61 3 9358 5558

e-mail [email protected]

FW Murphy

P.O. Box 470248

Tulsa, Oklahoma 74147 USA

+1 918 317 4100

fax +1 918 317 4266

e-mail [email protected]

www.fwmurphy.com

USA–ISO 9001:2000 FM 28221

UK–ISO 9001:2000 FM 29422

Printed in U.S.A. 0777070

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