FW MURPHY LM500-TF-ATEX Lube Level Maintainer Installation Guide

FW MURPHY LM500-TF-ATEX Lube Level Maintainer

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 http://www.fwmurphy.com/warranty

WARNING

Ex ic IIC T5 Gc X -20°C < Ta < 85°C
NOTE: To use in an ATEX environment the metal vent cap must be left on or the LM500-TF-ATEX must be plumbed directly to the engine to meet IP54.

Please read the following information before installing:

• DO NOT DISCONNECT WHILE ENERGIZED.
• POTENTIAL ELECTROSTATIC CHARGING HAZARD-WIPE UNIT WITH DAMP CLOTH ONLY.
• INTRINSIC SAFETY BARRIER IS REQUIRED.
  • Entity parameters: Ui=30 V, li=75 mA, Ci = 0 MH, Pi = 0.6 W

BEFORE BEGINNING INSTALLATION OF THIS FW MURPHY PRODUCT:

• A visual inspection of this product for damage during shipping is recommended before installation.
• It is your responsibility to ensure that qualified mechanical and electrical technicians install this product.
• Disconnect all electrical power to the machine.
• Make sure the machine cannot operate during installation.
• Follow all safety warnings of the machine manufacturer.
• Read and follow all installation instructions.
• Please contact FW Murphy Production Controls immediately if you have any questions.

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General Information

Description

The FW Murphy LM500-TF-ATEX model maintains the crankcase oil level of an engine, pump, or compressor. Adjusted to the correct running oil level, the LM500 will replenish oil as it is used. The low-level switch will alarm and/or shut down the equipment if the supply oil is lost and the equipment continues to use oil. The LM500-TF-ATEX model includes a test feature that confirms both the float and switch are operating correctly with a single press of the test button. Can be used in an ATEX environment (the metal vent cap must be left on or plumbed directly to the engine to meet IP54.

Dimensions

Operating the Range of the Snap Switch
Figure 1 shows the LM500 dial and the operating range of the switch. If the level is within the designated zones, the switch will activate. The switch activates approximately ¼ in. (6 mm) from the bottom of the low zone. The dial-in Figure 1 shows that if the level continues to drop into the low-low zone, a shutdown will occur.

NOTE: color zones on the dial face show approximate normal operating zones. Actual conditions may vary depending on the operating characteristics of the engine. Placement of the LM500-TF-ATEX according to the above instructions will compensate for these conditions.

Test Feature
The form C (3-wire) contact allows a controller/annunciator to be wired as a closed-loop system, resulting in a reliable fault-sensitive circuit.

Thumb-ValveTM Operation
As the equipment uses oil, the float falls, providing immediate level compensation. At the FULL position, the float holds the valve closed. If the clean oil supply is depleted and the oil level continues to fall, the low- level switch will operate an alarm or equipment shutdown.

LM500 Series Flow Rates
LM500 Series Flow Rates are based on SAE 40 motor oil @2 ft. head pressure. Friction losses due to piping are not considered.

Service Parts (Specify part number)

Hose Kit: (P/N 15000355)

Typical Installation

Mounting the LM500-TF-ATEX

NOTE: Mount the LM500 as close as possible to the crankcase.
CAUTION: Excessive vibration can cause overfill. Be sure mounting brackets are supported.

The following instructions are based on the use of the pipe and universal mounting brackets shown on page 1.

Pipe Bracket Mounting (PM) (P/N 15000518)

1. Mount a nominal 1/2 in. (13 mm) diameter pipe to the base of the engine.
2. Install the pipe bracket to the LM500 using two 1/4-20 UNC x 3/4 in bolts; nuts and lock washers are supplied. See Figure 2A.
3. Slip the LM500 onto the pipe and install the two adjustment bolts. Each bolt consists of a 1/4-20 UNC x 3/4 in. bolt, nuts, and lock washers. See Figure 2B. DO NOT tighten the adjustment screws too tight as height adjustment might be needed later during the operation. Refer to “Connecting Fittings and Hoses”, for more information regarding height adjustment of the LM500 in alignment with the oil level in the crankcase.

Universal Bracket Mounting (UB) (P/N 15000519)
The universal bracket has two mounting methods: base mountingandr pan mounting.

Base Mounting

1. Install the universal bracket to the base as shown in Figure 3A using two flat washers and two 5/16 inch dia. bolts or others as necessary.
2. Mount the LM500 to the universal bracket using two 1/4-20 UNC x 3/4 inch (19.05mm) bolts; nuts and lock washers supplied (Figure 3B). DO NOT tighten the adjustment screws too tight as you will have to adjust the LM500 later in the installation process. Refer to “Connecting Fittings and Hoses” for information regarding the height adjustment of the LM500 in alignment with the oil level in the crankcase.

Crankcase (Oil Pan) Mounting

1. Install the universal bracket to the crankcase using the existing crankcase bolts (Figure 4A). The crankcase bolt diameter must be no larger than 7/16 inch (11 mm). NOTE: Check clearance between the crankcase and the mounting bracket before installing the mounting bracket. If the space between the crankcase the and mounting bracket is narrow, attach LM500 to the mounting bracket before installation on the crankcase.
2. Mount the LM500 to the universal bracket using two 1/4-20 UNC x 3/4 (19.05 mm) inch bolts, nuts, and lock washers supplied. DO NOT tighten the adjustment bolts too tight as height adjustment might be needed later during the operation. Refer to “Connecting Fittings and Hoses” for information regarding the height adjustment of the LM500 in alignment with the oil level in the crankcase.

Connecting Fittings and Hoses

The following instructions are based on the FW Murphy hose kit described on page 3.

1. Install the LM500 fittings in their proper locations
   NOTE: Apply a sealant such as Teflon®, to all threaded pipe connections.

2. Attach the 1-inch (25 mm) diameter, flexible monitoring hose to the crankcase and the monitoring port on the LM500. See Figure 5.
   CAUTION: The hose must slope slightly downward from the LM500 and MUST NOT have any droops or low spots.
   NOTE: if the drain plug on the crankcase is used for the connection, it is recommended that a tee be installed to allow draining of the crankcase for service.

3. Install the 1/2 inch (13 mm) I.D. x 3 ft (914 mm) hose to the vent connection on the LM500 and to the vent connection on the crankcase. See Figure 6. The vent connection on the crankcase must be well above the regulated oil level. All hoses must be clear of obstructions, valleys, or dips that could create liquid traps, or gas/air pockets. The vent and crankcase connections should be as straight as possible. BEFORE CONTINUING, VERIFY THAT ALL HOSE CLAMPS ARE TIGHT.

4. Fill the crankcase to the proper oil level.
   IMPORTANT: With the engine running and warm, loosen the mounting bracket adjustment bolts and adjust the LM500 so that the oil level in the sight gauge is aligned with the middle of the green bar on the dial (see example, Figure 5).

5. Tighten the adjustment bolts securely.

Connecting the LM500 to an Oil Supply Tank

1. Remove the plug from the oil inlet connection. Be sure the removable screen, inside the connection, is clear of debris. Install the oil inlet connection.

2. Connect a 1/2 in I.D. (13 mm) or larger hose to the oil inlet fitting on the LM500 and to the shutoff valve on the oil supply tank. See Figure
   7. The recommended minimum height above the LM500 is 2 ft. (0.6); the maximum is 25ft (7.7 mm). The hose must maintain a downward slope and not have low spots or droops. The maximum head pressure rating is 9.50 psi or 25 ft. oil (head pressure).

3. Before filling the supply tank with oil, be sure the tank is clean and dry and the shutoff valve is closed. Also, be sure all hoses and clamps are tight. Fill the tank with CLEAN oil.
   WARNING: Overfill conditions can be caused by excessive inlet pressure and/or improper “vent-to-crankcase” installation.
   NOTE: To use in an ATEX environment, leave the metal vent cap on or plumb directly to the engine to meet IP54.

4. After the oil supply tank is full, open the shutoff valve.

Next, make the proper electrical connections for the application. (See snap switch ratings on page 8 and schematic on page 3.)

LM500-TF-ATEX Typical Installation

WARNING: Perform this installation using appropriate protection. Trapped air and hot oil may cause burns.

Specifications

• Crankcase Balance Vent Connection : 1/2 NPTF (top)
• ATEX Rating : Ex ic IIC T5 GC X -20o C < Ta < 85o C
• Inlet Connection : 2 x 1/2 NPTF (side), 1 x 1/2 NPTF (bottom)
• Outlet Connection : 2 x 3/4 NPTF (sides), 1 x 3/4 NPTF (bottom)
• Thumb-ValveTM Material : Viton
• Snap-switch : SPDT rating 75 mA@30 VAC/VDC Max
• Wire leads  18 AWG x 15 in ± 1 in (355 mm) length.
• Conduit Connection: 1/2 inch conduit (female, top).
• Case : Die cast aluminum
• Lens : Clear “Frog Eye” non-staining, high impact, high-temperature nylon; UV and heat stabilized. Dial: High visibility white background with solid green band for normal level indication.
• Maximum Inlet Pressure : 9.50 psi/25 ft. oil (head pressure).
• Maximum Differential: 2 in (51mm) between running and stopping.
• ATEX Operating Temperature: -20°C (-4°F) to 85°C (185°F).
• Float: 304 Stainless Steel
• Flow Rates : Refer to the Flow Rate Chart on page 3.

To consistently bring you the highest quality, full-featured products, we reserve the right to change our specifications and designs at any time. FW MURPHY product names and the FW MURPHY logo are proprietary trademarks: This document, including textual matter and illustrations, is copyright protected with all rights reserved. (c) 2023 FW MURPHY. A copy of our typical warranty may be viewed or printed by going to www.fwmurphy.com/warranty.

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