Murphy Switch LLS User Manual

LLS-93096N

Effective 03-94

Section 05

LLS, LLSB, LLSR, LLSRB Series Models

Lead Line Pressure Switches

FRANK W.

MFR.

Installation and Operation Instructions

Please read the following information before installing. A visual inspection of this product for damage during shipping is recommended before mounting.

It is your responsibility to have a qualified person install the unit and make sure installation conforms to NEC and local codes.

GENERAL INFORMATION

WARNING

BEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT

✔ Disconnect all electrical power to the machine.

✔ Make sure the machine cannot operate during installation.

✔ Follow all safety warnings of the machine manufacturer.

LLS Series Pressure Switch

✔ Read and follow all installation instructions.

• Sensor Body: LLS: CRS steel chromate plated; 2 in. NPT connection.

Description

LLSB: Thick wall 304 stainless steel sensor 2 in. NPT process connection.

LLSR: Remote Sensor; Nickel plated steel, stainless steel capillary.

LLSRB: Remote Sensor; 316 stainless steel housing and capillary.

• Diaphragm Materials:

The LLS Series is a pressure switch for applications where viscous liquids

could plug the sensing orifice. LLS and LLSB models have a 2 inch NPT

male connection which attaches directly into the process line. LLSR and

LLSRB models feature a remote sensor connected to the pressure switch by a

length of stainless steel capillary and armor. The snap-acting switch is field

adjustable. The switch is housed in a hard anodized aluminum enclosure.

LLS/LLSB: Ni-SPAN^®. LLSR/LLSRB: 316L S. Steel–Teflon* coated.

• Snap-switch Ratings: SPDT (Std.): 15 A @ 125, 250 or 480 VAC

SPDT (Gold): 100 mA @ 125 VAC; 0.250 A @ 6 VDC

Optional for LLSR and LLSRB models is a 1 inch NPT x 1 inch NPT (male)

pulsation dampener to minimize damaging pressure pulsation to the switch.

DPDT (Std.): 11 A @ 125 or 250 VAC

DPDT (Gold): 100 mA @ 125 VAC; 0.250 A @ 6 VDC

• Trip Point Adjustment: Field-adjusted with screwdriver.

• LLSR/LLSRB Mount: 4-hole bolt pattern; 1/4 in. (6 mm) dia. bolts.

• LLS/LLSB Mount: Direct mount into process (2 in. NPT connection).

• Shipping Weight: LLS/LLSB: 4 lbs. 9 oz. (2.25 kg).

LLSR/LLSRB: 7 lbs. 12 oz. (3.23 kg).

• Shipping Dimensions: LLS/LLSB: 10 x 9-1/4 x 5-3/4 in. (254 x 235 x 146 mm).

LLSR/LLSRB: 15-3/4 x 11 x 5-1/4 in. (400 x 279 x 133 mm).

Specifications

• Maximum Ambient Temperature: -10° to +160°F (-23° to +71°C).

• Maximum Process Temperature: -40° to +160°F (-40° to +71°C).

• Temperature Compensation: The volumetric expansion and contraction of

the fill may cause a shift of ±3% to ±5% of the set point.

• Switch Enclosure: Aluminum hard anodized (black). NEMA 4, 4x. NEMA 7

and 9 explosion-proof, waterproof and corrosion resistant. Suitable for Class I,

Div. 1, Groups A, B, C, D; Class II, Div. 2, Groups E, F, G.

Sensor Model Selection Table

Switch Adjustment Range

Dead Band Approximate

Max System

Base

Model

Wetted Parts Materials

psi

kPa/MPa

psi

kPa/MPa

psi

MPa

50–450

345 kPa–3.1 MPa

5–45

34 kPa–310 kPa

1500

2500

3000

10.3

17.2

20.6

CRS steel sensor –chromate plated (yellow)

Ni-SPAN^®diaphragm.

100–1750 689 kPa–12 MPa

200–2500 13.8 MPa–17.2 MPa

400–4000 2.8 MPa–27.5 MPa

15–100 103 kPa–689 kPa

20–150 137 kPa–1.03 MPa

75–450 517 kPa–3.1 MPa

LLS

5000

34.4

50–450

345 kPa–3.1 MPa

5–45

34 kPa–310 kPa

1500

2500

3000

5000

1500

2500

3000

10.3

17.2

20.6

34.4

10.3

17.2

20.6

Thick wall 304 stainless steel sensor housing;

Ni-SPAN^®diaphragm. Meets NACE MR-01-75

standard for direct exposure to H₂S.

100–1750 689 kPa–12 MPa

200–2500 13.8 MPa–17.2 MPa

400–4000 2.8 MPa–27.5 MPa

15–100 103 kPa–689 kPa

20–150 137 kPa–1.03 MPa

75–450 517 kPa–3.1 MPa

LLSB

50–450

345 kPa–3.1 MPa

5–45

34 kPa–310 kPa

Remote sensor–Nickel plated steel w/ stainless

steel capillary; Teflon* coated diaphragm.

100–1750 689 kPa–12 MPa

200–2500 13.8 MPa–17.2 MPa

15–100 103 kPa–689 kPa

20–100 137 kPa–689 kPa

LLSR

LLSRB

50–450

345 kPa–3.1 MPa

5–45

34 kPa–310 kPa

1500

2500

5000

10.3

17.2

34.4

Remote sensor–AISI 316 stainless steel housing;

stainless steel capillary and armor; AISI 316L

stainless steel Teflon* coated diaphragm.

100–1750 689 kPa–12 MPa

200–2500 13.8 MPa–17.2 MPa

400–4000 2.8 MPa–27.5 MPa

15–100 103 kPa–689 kPa

20–150 137 kPa–1.03 MPa

75–450 517 kPa–3.1 MPa

* Teflon–DuPont Trademark

INSTALLING THE LLS SERIES PRESSURE SWITCH

WARNING: PERFORM THE INSTALLATION WITH POWER SOURCE “OFF”. NEVER EXCEED RATED PRESSURE RANGE FOR THE UNIT.

USE WRENCH ON SHANK TO TIGHTEN/LOOSEN CONNECTIONS. DO NOT TWIST THE ENCLOSURE WHEN SCREWING THE LLS INTO THE

PROCESS – THIS WILL DAMAGE INTERNAL COMPONENTS, FILLED MECHANISM AND THE SEALS. DO NOT OVERTIGHTEN THE UNIT.

Connecting the LLS and LLSB Series

Figure 1

Do NOT Tamper with

these Sealed Connections

To install the LLS and LLSB Series, a vertical mounting is recommended.

Do NOT Tamper with

This Connection

1. The unit threads directly into a 2 in. 11-1/2 NPT tee on the lead line.

CAUTION: DO NOT TAMPER WITH OR BREAK SEALED CONNEC-

TIONS. APPLY PIPE SEALANT TO PROCESS CONNECTION THREADS.

Wrench Flats

2 in. NPT

Use Wrech Flats to

Screw the LLS

Into the Process

2. Tighten the bottom housing to the lead line tee using ONLY the

transmitter wrench flats (see figure 1).

Lead line tee

3. Check for leakage on any of the connections. Make sure that the

installation conforms with local and other applicable codes.

Connecting the LLSR and LLSRB Series

For mounting the switch enclosure refer to “Dimensions” on page 2.

The following instructions are based on the usage of a PD8187 Pulsation

Dampener option shown in Figure 2 (at right.)

Transmitting Tubing

(capillary)

Figure 2

Housing

Bolts

Diaphragm

Body

1. Install sensor/pulsation dampener into pressure source connection.

CAUTION: THE PD8187 PULSATION DAMPENER IS NOT INTENDED

AS A SHUTOFF VALVE. APPLY PIPE SEALANT TO THE THREADS.

Wrench

Flats

2. Loosen the eight housing bolts until the bottom housing is free to turn.

CAUTION: WHEN LOOSING THE EIGHT HOUSING BOLTS, MAKE

SURE NOT TO UNSCREW THE GREEN DIAPHRAGM CAPSULE.

Pulsation

Dampener

(optional)

3. Tighten the bottom housing to the pulsation dampener connection.

1 in. NPT

4. Tighten the eight housing bolts to 25±3 foot lbs. Stagger the tighten-

Lead Line Tee

ing to assure even clamping.

5. Route capillary away from heat source (exhaust manifold). Excess

capillary should be carefully coiled and secured (do NOT cut it).

WIRING THE LLS SERIES PRESSURE SWITCH

WARNING: PERFORM THE WIRING OPERATION WITH THE POWER SOURCE “OFF”. MAKE SURE VOLTAGE AND CURRENT REQUIRE-

MENTS ARE WITHIN THE LLS RATINGS. BEFORE WIRING THE UNIT DETERMINE VOLTAGE AND POLARITY FOR THE APPLICATION.

IF THE UNIT IS USED IN HAZARDOUS AREAS, MAKE THE AREA SAFE BEFORE REMOVING THE SNAP-SWITCH(ES) COVER.

If switch trip point needs to be adjusted, see page 4.

Schematic

LLS Series Hook-up (all models)

To wire the LLS Series, use proper the electrical conduit.

SPDT

DPDT

1. A 3/4''-14 NPT inlet connection for conduit installation is provided

at the top end of the switch enclosure (see opposite page–

“Dimensions” for location).

NOTE: The plastic plug (supplied) is to protect the conduit inlet threads

and must be removed before wiring the unit.

Figure 3

Customer

Wiring

DPDT

SPDT

2. Using a 3/16 in. hex wrench, unscrew the 4 hex-cap screws.

Now proceed to remove the square cover to reveal snap-switch(es).

3/4 in.-14 NPT

Conduit Inlet

3. To wire the unit, refer to the typical wiring drawing (Figure 3) and

to the Schematic (shown at right). Wire the LLS Series switch(es)

with 60°/75°C (140°/167°F) insulated wire.

Provision for

Case Ground

N.O. N.C. COM.

NC NO

Terminal

Block(s)

4. A terminal (inside the switch enclosure) is provided for case or

equipment grounding, refer to Figure 3 for location.

5. After completing wiring, replace the switch cover and make sure it

is tightly secured before applying power to the system.

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)

Figure 4

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.

Snap-switch(es) Cover

or Square Cover

Do NOT remove until

the area is made

To Reset for Rising Pressure

1. Locate and remove the Switch Trip Point Adjustment cover

(round) to reveal the Adjustment Wheel, (see figure 4).

Screwdriver

NON-HAZARDOUS

Adjustment

Wheel

WARNING: DO NOT REMOVE SNAP-SWITCH COVER AT THE

INSTALLATION SIGHT UNTIL THE AREA IS MADE NON-HAZARDOUS.

To increase

set point

To decrease

set point

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.

Switch Trip Point

Adjustment Cover

or Round Cover

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.

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.

■ Murphy de México, S.A. de C.V.

■ Frank W. Murphy, Ltd.

FRANK W.

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-mail [email protected]

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

tel. +44 1722 410055 fax +44 1722 410088 tlx 477088

e-mail [email protected]

MFR.

Since 1939