UDIAG ALT300 vs ALT400: Which Smoke Leak Detector Suits Your Needs?
Why Use an Automotive Smoke Leak Detector
Before we compare the two models, let’s understand why we use an automotive smoke leak detector.
Modern vehicles use advanced vacuum systems such as exhaust gas recirculation systems, evaporative emission control systems, turbocharging systems, intake manifolds and vacuum circuits. Even small leaks in these pipe systems can cause serious problems. Common causes for leaks include:
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Aging or Damaged Hoses: Cracked or brittle vacuum and EVAP hoses often go unnoticed.
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Loose or Faulty Clamps and Fittings: Improperly secured components can allow air or vapor to escape.
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Worn Gaskets and Seals: Engine heat and wear can cause rubber or silicone seals to fail over time.
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Faulty Components: EVAP valves, purge solenoids, and turbo connections may develop small but critical leaks.
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DIY or Poor Repairs: Incorrect installation of aftermarket parts or low-quality repairs may introduce hidden leak points.
Traditionally locating these leaks manually can be time consuming, but a smoke machine can simplify the process by pumping smoke into the vehicle's systems, making the leak immediately visible. This reduces detection time from hours to minutes.
UDIAG Smoke Leak Detector Introduction
The ALT300 Automotive smoke leak detector is an entry-level diagnostic tool designed for detecting leaks in various pipeline systems. It enables fast and accurate leak localization, helping technicians and vehicle owners quickly identify and resolve issues while significantly reducing diagnostic time.
The ALT400 is an upgraded smoke leak detector based on the ALT300, featuring adjustable smoke flow for better control in various repair scenarios. It quickly and accurately detects pipeline leaks, helping users diagnose issues faster and reduce downtime.
UDIAG ALT300 vs ALT400 Main Function Comparison
Target Customers
The ALT300 is designed for DIY enthusiasts and hobbyists, offering simple, easy-to-use features for occasional use. The ALT400 is tailored for frequent users and mechanics, with features that simplify repetitive or professional-level testing. However, there is no essential difference between the two products, and both are suitable for the general public.
Smoke Output
The ALT300 has a steady smoke output that’s great for identifying small, immediate leaks, perfect for everyday EVAP or vacuum system checks. The ALT400 has a thicker smoke output that’s better suited for more complex scenarios like turbo or intake system testing, where visibility is key for quick detection.
Both provide reliable results for their intended use, but the difference in smoke density really shines when you’re dealing with a complex engine compartment or need to track down a leak quickly in a professional environment.
Control Panel
The ALT300 uses a central button to control the air pump and smoke, with simple and intuitive operation and a convenient hanging hook. It is also equipped with a cone and inflatable adapter to match most air inlet sizes.
The ALT400 adds an air flow meter and smoke adjustment switch to the ALT300, with adjustable smoke flow for better control in various maintenance scenarios.
Integrated Smoke Oil Tank
The smoke oil tank inside the smoke leak detector has been upgraded to a seamless integrated design to effectively prevent oil leakage. The oil heating process has also been improved to improve efficiency and safety, ensuring that the internal temperature is stable during operation and preventing the temperature from rising rapidly.
Security Features
Both models are designed with safety in mind and are equipped with thermal protection. The built-in intelligent safety system automatically cuts off the power supply when the internal temperature exceeds 75°C to protect the safety of users and equipment. The product is designed to operate safely in a wide range of temperature environments.
Accessories
The ALT300 comes with a full set of accessories including oil bottles, cone adapters, universal airbags, EVAP connectors and plug kits to meet all needs for common testing scenarios right out of the box.
The ALT400 also includes a range of specialized kits (e.g., smoke delivery hose, intake airbag replacement rubbers) to suit a variety of vehicles from cars to snowmobiles and speedboats.
Pressure Gauges for Quick Leak Diagnosis
Both products have a built-in pressure gauge, which allows for quick and intuitive leak detection. If the pressure reading remains stable, the system is well sealed and has no leaks. A gradual decrease in the pressure reading indicates a small leak in the system. If the pressure drops to zero quickly, it indicates a major or large leak.
How do I operate a smoke detector?
Add Test Oil
Pour 10–30 ml of smoke testing oil into the smoke machine. A full fill of 30 ml allows for approximately 15 minutes of continuous operation under standard conditions.
Prepare the Vehicle System
Open the pipe or system you wish to test, ensuring access for connection.
Connect the Adapter and Hose
Install the inflatable adapter into the sealed pipe opening, then connect the smoke output hose from the detector to the adapter.
Power the Device
Connect the smoke machine to a DC 12V vehicle battery. The device will begin generating smoke automatically.
Inspect for Leaks
Allow the system to fill with smoke. Under proper sealing, the pipeline typically fills in about 1 minute. If leaks are present, smoke will become visible at the leak points within 3 minutes.
Conclusion
Both the UDIAG ALT300 and ALT400 smoke leak detectors are reliable leak detection tools, but they have their own advantages in different scenarios. The ALT300 is perfect for the average user who values simplicity and affordability, while the ALT400 focuses on efficiency and versatility, making it an ideal choice for both daily and professional use.
With either product, you can save time and take the guesswork out of tracking down those frustrating leaks.
