1. Introducción
The AUTOOL LM120 Digital Manifold Gauge is an intelligent electronic instrument designed to assist in the installation, testing, and maintenance of refrigeration equipment. This includes systems such as air conditioners, refrigerators, and cold storage units. It provides precise measurements for pressure, temperature, and vacuum, along with advanced diagnostic capabilities.
Image 1.1: AUTOOL LM120 Digital Manifold Gauge in use, connected to an automotive air conditioning system.
2. Información de seguridad
Lea y comprenda todas las instrucciones de seguridad antes de utilizar el dispositivo. El incumplimiento de estas instrucciones podría provocar lesiones o daños al equipo.
- Always wear appropriate personal protective equipment (PPE), including safety glasses and gloves, when working with refrigeration systems and refrigerants.
- Ensure adequate ventilation in the work area to prevent the accumulation of refrigerant gases.
- No exponga el dispositivo a temperaturas extremas, luz solar directa o ambientes corrosivos.
- Manipule las mangueras y conexiones de refrigerante con cuidado para evitar fugas y descargas accidentales.
- Refer to local regulations and industry standards for the safe handling, recovery, and disposal of refrigerants.
- No intente reparar ni modificar el dispositivo. Contacte con personal cualificado para obtener servicio técnico.
3. Producto terminadoview y componentes
The LM120 Digital Manifold Gauge features a robust design with an intuitive interface. Familiarize yourself with the components shown below.
Image 3.1: Detailed diagram of the LM120 Digital Manifold Gauge components.
- Gancho
- Clamp-on Temperature Probe Socket
- Pantalla LCD
- Botón de función
- Botón Ejecutar/Parar
- Botón cero
- R+/R- Refrigerant Type Selection Buttons
- Botón de atenuación
- Botón de unidad
- Botón ° C / ° F
- Botón de encendido
- Válvula de baja presión
- Refrigerant Observation Window
- Válvula de alta presión
- 1/4 inch Low Pressure Inlet
- Válvula de alivio
- 1/4 inch High Pressure Inlet
- Refrigerant Inlet / Vacuum Pump Inlet
4. Configuración
Before first use, ensure the device is ready for operation.
4.1 Encendido inicial
- Mantenga pulsado el Botón de encendido (11) para encender el dispositivo.
- The LCD Display (3) will illuminate and show the initial readings.
4.2 Conexión de mangueras
Connect the appropriate refrigeration hoses to the inlets on the manifold gauge.
- Connect the low-pressure hose to the 1/4 inch Low Pressure Inlet (15).
- Conecte la manguera de alta presión a la 1/4 inch High Pressure Inlet (17).
- Connect the service hose (for vacuum pump or refrigerant tank) to the Refrigerant Inlet / Vacuum Pump Inlet (18).
- Asegúrese de que todas las conexiones estén bien ajustadas para evitar fugas.
4.3 Connecting Temperature Probes (Optional)
For dual temperature measurement, connect compatible clamp-on temperature probes (not included) to the Clamp-on Temperature Probe Socket (2).
5. Instrucciones de funcionamiento
This section details the various functions and how to operate the AUTOOL LM120.
5.1 Visualización sobreview
The large LCD provides clear, real-time data for pressure, temperature, and other parameters.
Image 5.1: The smart digital display provides clear readings for various parameters.
5.2 selección de unidad
To change pressure or temperature units:
- Presione el Botón de unidad (9) to cycle through available pressure units (e.g., Kpa, Psi, Bar).
- Presione el Botón ° C / ° F (10) to switch between Celsius and Fahrenheit temperature displays.
5.3 Refrigerant Type Setting
The device has a built-in database of 89 refrigerants. Select the correct refrigerant type for accurate calculations.
Image 5.2: Setting the refrigerant type on the LM120 display.
- Utilice el R+/R- Refrigerant Type Selection Buttons (7) to scroll through the available refrigerant types.
- Confirme su selección.
5.4 Medición de presión
The LM120 measures both high and low pressures simultaneously.
- Ensure hoses are correctly connected to the high and low-pressure ports of the system.
- The display will show the current high and low pressure readings.
5.5 Medición de temperatura
With optional clamp-on temperature probes, the device can measure dual temperatures.
Image 5.3: High/Low pressure temperature test display.
- Attach the temperature probes to the desired measurement points (e.g., suction line, liquid line).
- The display will show T1 and T2 temperature readings.
5.6 Evaporation Pressure & Temperature Test
This function measures the maximum pressure when the refrigerant changes from liquid to gas and the lowest temperature when the liquid becomes gaseous.
Image 5.4: Evaporation pressure and temperature test results on the display.
5.7 Condensing Pressure & Temperature Test
This function measures the minimum pressure when the refrigerant changes from gas to liquid and the maximum temperature when the gas changes to liquid.
Image 5.5: Condensing pressure and temperature test results on the display.
5.8 Prueba de fugas de presión
The device can perform a pressure leakage test, recording leak time and speed.
Image 5.6: Pressure leakage test in progress, showing initial and current pressure values over time.
- Conecte el medidor al sistema que se va a probar.
- Presione el Botón de función (4) to navigate to the leakage test mode.
- Follow the on-screen prompts to start and monitor the test. The device calculates the pressure difference between the initial and second test pressures to determine if refrigerant is leaking.
5.9 Medición de vacío
The LM120 can measure the percentage of vacuum achieved in a system.
- Connect the vacuum pump to the Refrigerant Inlet / Vacuum Pump Inlet (18).
- Activate the vacuum pump and monitor the vacuum percentage en la pantalla.
5.10 Superheat and Subcooling Calculation
Leveraging its integrated 89-type refrigerant database, the LM120 can automatically calculate superheat and subcooling temperatures.
Image 5.7: Built-in database of 89 refrigerant types for accurate calculations.
- Ensure the correct refrigerant type is selected (refer to Section 5.3).
- With pressure and temperature probes connected, the device will display calculated superheat and subcooling values.
6. Mantenimiento
Proper maintenance ensures the longevity and accuracy of your LM120 Digital Manifold Gauge.
- Limpieza: Limpie el dispositivo con un paño suave y seco. No utilice limpiadores abrasivos ni disolventes.
- Almacenamiento: Store the gauge in its original case or a protective container in a cool, dry place away from direct sunlight and extreme temperatures.
- Inspección de manguera: Regularly inspect refrigerant hoses for cracks, wear, or damage. Replace damaged hoses immediately.
- Verificación de conexión: Ensure all connections and valves are clean and free of debris.
7. Solución de problemas
If you encounter issues with your LM120, refer to the following common problems and solutions.
| Problema | Posible causa | Solución |
|---|---|---|
| El dispositivo no enciende | Low or depleted internal battery; power button not pressed correctly. | Ensure the device is charged or has sufficient power. Press and hold the Power Button firmly. |
| Inaccurate pressure/temperature readings | Incorrect refrigerant selected; loose hose connections; faulty probes; sensor calibration needed. | Verify the correct refrigerant type. Check all hose connections for tightness. Ensure temperature probes are clean and properly connected. Perform a zero calibration if available (using Zero Button). |
| La pantalla está oscura o ilegible | Luz de fondo apagada; batería baja. | Press the Dimming Button (8) to adjust backlight. Ensure the device is charged. |
| Leakage test shows false positive/negative | Improper connection; external temperature fluctuations; insufficient test duration. | Ensure all connections are absolutely leak-free. Conduct the test in a stable environment. Allow sufficient time for the test to complete. |
8. Especificaciones
Detailed technical specifications for the AUTOOL LM120 Digital Manifold Gauge.
| Característica | Especificación |
|---|---|
| Fabricante | AUTOOL |
| Número de modelo | LM120 |
| Material | High-strength Engineering Plastic |
| Rango de prueba de presión | 0 Kpa – 6000 Kpa |
| Resolución de la prueba de presión | 1 kPa |
| Precisión de la prueba de presión | +/- 0.5 %(FS) + 5dgt |
| Límite de sobrecarga de presión | 10000 kPa (10 Mpa; 100 bar) |
| Number of Refrigerants in Database | 89 tipos |
| Estándar de interfaz | 1/4 de pulgada |
| Dimensiones (L x An x Al) | 20.32 x 7.62 x 12.7 cm (8 x 3 x 5 pulgadas) |
| Peso | 59.53 g (2.1 onzas) |
| Componentes incluidos | 1 set of LM120 Digital Refrigeration Manifold Gauge |
| Pilas necesarias | No (implies internal rechargeable or power source) |
| Código Postal | 733810026709, 733810026198 |
9. Garantía y soporte
AUTOOL is committed to providing high-quality products and customer satisfaction.
- Garantía de tres años: For damage caused by non-human factors, AUTOOL promises to resend parts free of charge within 3 years from the date of purchase.
- Permanent Maintenance: The product is covered by permanent maintenance support.
- Atención al cliente: For any inquiries, technical assistance, or warranty claims, please contact AUTOOL customer support. You can expect a response within 24 hours.