Murphy LLSRB Series, LLSB specifications To Reset for Falling Pressure, Follow and above, then

ADJUSTING THE TRIP POINT

CAUTION: REMEMBER THAT THE FIELD-ADJUSTABLE TRIP POINT MAY HAVE BEEN FACTORY SET TO YOUR SPECIFICATIONS. ADJUSTMENT OF THE TRIP POINT VARIES ACCORDINGLY TO THE APPLICATION AND MUST BE PERFORMED BY A QUALIFIED PERSON.

LLS Series Trip Point Adjustment if necessary (all models)

NOTICE: If trip point is not specified, the switch will be set at approx- imately 50% of full scale. To perform trip point re-adjustments, a test stand with variable pressure source, a test light, and a pressure gauge (such as our OPLG or OPLFG MURPHYGAGE® ) may be used.

To Reset for Rising Pressure

1.Locate and remove the Switch Trip Point Adjustment cover (round) to reveal the Adjustment Wheel, (see figure 4).

WARNING: DO NOT REMOVE SNAP-SWITCH COVER AT THE

INSTALLATION SIGHT UNTIL THE AREA IS MADE NON-HAZARDOUS.

2.After area is made non-hazardous, proceed to remove the square cover to reveal the snap-switch(es).

3.Connect test light to (COM) and (N.C.) terminals. The light should turn “ON”. Gradually increase the pressure until the light turns“OFF”. Observe the trip point pressure reading.

4.With a screwdriver, turn the adjustment wheel to the desired setting. Repeat step 4 until the light turns “OFF” at the desired pressure.

To Reset for Falling Pressure

Follow step 1 and step 2 (above), then:

3.Connect test light to (COM) and (N.O.) terminals. The light should stay “OFF”. Gradually increase the pressure until the light turns“ON”. Observe the trip point pressure reading.

4.With a screwdriver, turn the adjustment wheel to the desired setting. Repeat step 4 until the light turns “OFF” at the desired pressure.

Replace the adjustment and the switch covers securely.

Figure 4

Snap-switch(es) Cover
or Square Cover
Do NOT remove until
the area is made	Screwdriver
NON-HAZARDOUS
Adjustment
Wheel
To increase	To decrease
set point	set point

Switch Trip Point

Adjustment Cover

or Round Cover

WARRANTY

A two year limited warranty on materials and workmanship is provided with this Murphy product. Details are

available on request and are packed with each unit.

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.

FRANK W. ®

Since 1939 MFR.

■Frank W. Murphy Manufacturer

P.O. Box 470248; Tulsa, Oklahoma 74147; USA tel. (918) 627-3550 fax (918) 664-6146 e-mailfwmurphy@ionet.net

■Frank W. Murphy Southern Division

P.O. Box 1819; Rosenberg, Texas 77471; USA tel. (281) 342-0297 fax (281) 341-6006 e-mailmurphysd@intertex.net

■Frank W. Murphy, Ltd.

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

tel. +44 1722 410055 fax +44 1722 410088 tlx 477088 e-mailsales@fwmurphy.co.uk

■Frank W. Murphy Pte., Ltd.

26 Siglap Drive; Republic of Singapore 456153 tel. +65 241-3166 fax +65 241-8382 e-mailfwmsales@fwmurphy.com.sg

■Murphek Pty., Ltd.

1620 Hume Highway; Campbellfield, Vic 3061; Australia tel. +61 3 9358-5555 fax +61 3 9358-5558

■Murphy de México, S.A. de C.V.

Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje San Luis Potosí, S.L.P.; México 78384

tel. +52-48-206264 fax +52-48-206336 e-mailmurmexsl@sanluis.podernet.com.mx

■Murphy Switch of California

P.O. Box 900788; Palmdale, California 93590; USA tel. (805) 272-4700 fax (805) 947-7570 e-mailsales@murphyswitch.com

■Frank W. Murphy France

tel. +33 1 30 762626 fax +33 1 30 763989

Printed in U.S.A.

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