LM302

The Murphy LM302 Level Maintainer is an essential tool for maintaining the optimal liquid level in various applications, including industrial processes, laboratories, and water treatment systems. This versatile level controller is designed to automatically regulate and maintain the desired liquid level, ensuring efficient and consistent operation.

The LM302 is based on the proven and reliable LM301 microprocessor technology. It features a user-friendly interface with adjustable setpoint and hysteresis, making it simple to calibrate and operate. The controller utilizes a float sensor for level detection, which is suitable for a wide range of liquids, including water, acids, and alkalines.

The LM302 is built with high-quality components, ensuring durability and reliability. It has a rugged, all-weather enclosure, allowing it to be used in harsh environments without compromising performance. The controller operates on a standard 100-240V AC power supply and can handle up to 15A of load current.

The LM302 is designed for easy installation and integration into various systems. It includes multiple alarm and output relays, enabling users to set up alerts for high and low liquid levels, as well as power failure. The controller also offers a variety of communication options, including RS-232, RS-485, and Modbus protocols, making it compatible with various supervisory control systems.

The Murphy LM302 Level Maintainer offers precise and accurate level control, ensuring efficient use of resources and minimizing the risk of costly overflows or dry runs. Its rugged design, user-friendly interface, and versatile communication options make it a reliable and valuable addition to any system that requires automatic liquid level control.

The Murphy LM302 Level Maintainer is a battery maintenance device designed to keep 12-volt lead-acid batteries fully charged and at optimal performance. Here are some pros and cons of buying this product:

1. Automatic charging: The LM302 maintains the battery at a float charge, ensuring it remains fully charged without overcharging. This is beneficial for batteries that are not used frequently, as they can suffer from sulfation if not kept at full charge.

2. Low voltage cut-off: The device features a low voltage cut-off, which prevents the battery from being discharged below a certain voltage level. This helps prolong the life of the battery.

3. Temperature compensation: The LM302 includes temperature compensation, which adjusts the charging rate based on the ambient temperature. This ensures the battery is charged efficiently, regardless of the environmental conditions.

4. Easy installation: The device is simple to install and can be mounted on a wall or the battery box. It requires minimal wiring and can be connected to the battery using the supplied cables.

5. Cost-effective: The Murphy LM302 is a cost-effective solution for maintaining batteries in vehicles, RVs, boats, and other applications where batteries are not used frequently.

1. Limited compatibility: The device is designed for 12-volt lead-acid batteries only. It may not be suitable for other types of batteries, such as lithium-ion or gel batteries.

2. Size: The LM302 is a relatively large device, measuring 9.7 x 5.2 x 2.6 inches. It may not fit in smaller battery compartments or applications where space is limited.

3. No indication of battery status: The device does not provide any visual indication of the battery's charge status. Users must rely on other methods, such as a voltmeter, to check the battery's charge level.

4. No isolation: The LM302 does not provide any isolation between the battery and the charging source. This means that the charging source must be disconnected when working on the battery, to prevent accidental short circuits.

In conclusion, the Murphy LM302 Level Maintainer is a cost-effective and efficient solution for maintaining 12-volt lead-acid batteries in various applications. Its automatic charging, low voltage cut-off, and temperature compensation features help prolong the life of the battery and ensure optimal performance. However, its limited compatibility with other types of batteries, size, lack of indication of battery status, and lack of isolation are potential drawbacks.

If you have a 12-volt lead-acid battery in a vehicle, RV, boat, or other application where the battery is not used frequently and you want to ensure it remains fully charged and in good condition, the Murphy LM302 Level Maintainer is an excellent choice. It is cost-effective, easy to install, and provides automatic charging, low voltage cut-off, and temperature compensation features. However, if you have a different type of battery or limited space, or if you prefer visual indication of battery status or isolation between the battery and charging source, you may want to consider other options.

Details:

With its user-friendly design and reliable performance, the Murphy LM302 is a valuable addition to any toolbox.

specifications levelmeas:

• brand: Murphy
• mpn: Lm302
• model: Murphy Lm302
• part type: Level

general levelmeas:

• category: Home & Garden > Workshop Equipment > Measuring Layout Tools > Levels

offer levelmeas:

• best offers: true
• sold #: 5
• in stock #: 1
• availability: in stock
• started: april 16, 2026
• price: $360.00
• item condition: New
• options: ship-to-home

payments levelmeas:

• other
• credit card: diners-club
• wallet: paypal

seller levelmeas:

• # reviews: 65
• city: astoria, new york
• rating: 100.0%

returns levelmeas:

• policy: no returns

shipping levelmeas:

• service: usps ground advantage
• carrier: usps
• type: fixed
• transit: 5-12 days
• class: standard