AJL-3000 water leakage detector

User Manual for AJL-3000 Water Pipe Leakage Detector

I. Overview

1.1 Main purpose and scope of application

AJL-3000Water leak detectorIt is an instrument used to locate and determine the location of water supply pipeline leaks, and can also be used for leak detection in other pressure pipeline systems. When the fluid inside the pipeline escapes under pressure, noise can propagate along the pipeline or along the buried medium to the ground.AJL-3000Water leak detectorCan determine the location of the leak point along the pipeline or above its road surface. It is a leak detection instrument that uses low-power microprocessors and advanced filters to digitize noise. It uses a specially designed broadband high-sensitivity vibration sensor (pickup) to pick up and convert noise from the ground (or pipeline mouth) into electrical signals, which are amplified and digitally filtered. Two display images are displayed on the LCD screen. It is noted that the leakage noise is a continuous signal. In the digital processing, the method of detecting continuous noise in six frequency bands is used to generate six display rectangular columns, while suppressing sudden impact interference (not displayed). We also noticed the possible superposition of external interference, and adopted the small value method within the corresponding time, and provided corresponding numerical displays to maximize the suppression of external interference.

1.2 Product Features

1.2.1 Adopting a dot matrix type backlit LCD display screen to meet the needs of six horizontal and vertical light columns, and can be easily observed at night.

1.2.2 Specially designed bandwidth with two levels of variation, which not only takes into account the richness of vibration energy distribution during the listening process, but also allows for more precise frequency analysis.

1.2.3 Special storage for 9 channels, which can store both 7-band signals and measurement values from 7 measurement points separately.

The engineering plastic chassis and corresponding panel designed in 1.2.4 are very simple and easy to operate, which can obtain clear and extensive information in a convenient and simple way, making leak detection and testing work convenient and feasible.

1.3 Product Technical Parameters

1.3.1 Amplification factor: adjustable within 100dB.

1.3.2 Frequency analysis width: 70~4000Hz range, nearly 5 octave bands, two bandwidths.

1.3.3 Frequency Division (Center Frequency): a, 100HZ b: 200HZ c: 400HZ d: 800HZ e: 1000HZ f: 1500HZ g: 3000HZ

1.3.4 Bandwidth: narrowband: symbol ┃┃┃

b、 Medium broadband: symbol ┃┃┃┃┃┃

1.3.5 Numerical display: Corresponding to the display bar, the sampled value is displayed as a relative value between 0 and 100 as a small value.

1.3.6 Screen 54 × 54mm LCD display window

1.3.7 Power supply method: One set of lithium batteries with charging function.

1.3.8 After the battery is fully charged

Power supply working time ≥ 35 hours

1.3.9 Store 6 measurement values, divided into 6 channels and can be viewed separately.

1.3.10 Operating temperature: -10 ℃~+50 ℃

1.3.11 Storage temperature: -10 ℃~+70 ℃

1.3.12 Instrument size (L × W × D): 230 × 100 × 100 mm

1.3.13 Weight: AJL-3000 mainframe box contents (including battery) 1.2kg

AJL-3000 vibration pickup (with socket plug connection) 0.6kg

The total weight of the handbag is 5.2kg

2、 Overall structure of the product

2.3.1 Full Pass/Band Pass Key: Switching between Full Pass and Band Pass Modes

2.3.2 Bandwidth Key: Used for bandwidth selection

2.3.3 Setting key: used for selecting time and date, backlight brightness, and signal

2.3.4 Storage key: used to store data.

2.3.5 View Key: Used to view saved data.

2.3.8 Lighting button: When turned on, press this button to wake up the backlight.

2.3.9 Clear screen button: used to return.

2.3.10 Volume "+" and "-" keys: used to control the volume level.

3、 Usage and operation

3.1 Preparation before use

3.1.1 Connecting headphones and microphone

3.2 Operation and instructions during use

3.2.1 Wear headphones, place the microphone on the desktop or ground, turn on the device to enter the measurement interface, and the instrument defaults to "full pass" mode when turned on. Listen to environmental noise, or gently wipe the ground near the microphone with your feet, listen to the friction sound, and observe the dynamic of the column on the display screen. If you need to increase sensitivity, lightly press the "+" on the right end of the volume button, otherwise, lightly press the "-" until your ear feels good.

During the actual positioning process, it is necessary to press and hold the handle switch to receive data, and then release it after storage. To adjust the volume, you can also press the volume keys "+" or "-" accordingly.

3.2.2 Full Pass/Band Pass: The instrument is in a "full pass" state, which means that the leak detector can pass through and amplify all the sound vibrations received by the pickup in the range of 70 to 4000 Hz. The sound quality conveyed in headphones is rich, with a range of sensations from low to high frequencies, which means that the sound in this wide frequency band of the surrounding environment (through ground vibration) can be received. If the environment is quiet, it also has analyzability for water leakage detection. However, if the environmental noise is high, there will also be more interference, which may be difficult for operators who are new to this instrument to master. This requires switching to the "bandpass" state, where the "all pass/bandpass" button is used to switch between the two states.

The leak detector is set with 7 frequency bands and 2 bandwidths. The center frequencies of the 7 frequency bands are 100, 200, 400, 800, 1000, 1500, and 3000 hertz, which are respectively set with narrow and medium wide bandwidths for detailed frequency analysis of water leakage signals.

2.6 Storage of Volume Value: In bandpass or all pass mode, after confirming the detected value, press the "Storage" button, and the interface will automatically display the "Storage Channel: 1" interface. At this time, press the "Storage" button again, and the data will be saved. If you need to view it, press the "View" button. If you want to store the second set of data, you need to press the "Store" button and then press the "" button to select the second channel for storage. Each channel can only store one set of data, and the instrument has 9 storage channels. After each channel is filled with one set of data, when storing the second set of data, it will automatically overwrite one set of data. If you do not want to save after pressing the "Save" button, you can press the "Clear Screen" button to exit.

4、 Precautions for use

4.1 The leak detector is a precision instrument, and although it is operated in the field, its tolerance has been noted. However, the operator should take care of it and avoid unnecessary collisions, getting wet, scratching, and breaking the wiring. Special attention should be paid to prevent the vibration pickup from falling from a high place, and the surface of the instrument should not be heavily pressed or damaged to the LCD display screen and buttons. The outer packaging box is equipped with positioning pads, and all components must be placed in place during packing. When closing the box, all components must be straightened to avoid heavy pressure. When storing, pay attention to cleanliness, no corrosion, and avoid excessive humidity and high temperature.

5、 Attachment

5.1 Headphones, pickups, listening sticks, chargers.

Detailed information will be explained separately