Application of ultrasonic valve internal leak detector
• Valve leakage, leak detection
• Heat exchanger, boiler, condenser test
• Steam pipeline inspection
• Container, pipeline leak detection
• Pressure, vacuum leak detection
First, the detection principle:
When a fluid (gas or liquid) passes from the high pressure end through the valve to the low pressure end, it will be relatively "quiet" under normal conditions. Once the valve has leaks or internal leaks, turbulence will occur when the fluid passes through the leak point. Turbulence produces strong ultrasonic signals and can be detected by BX-IR 400 KA products even in noisy environments. Most valve leaks and internal leaks are recommended to be the most reliable. Valve leaks or internal leaks can be easily measured.
2. Introduction to the instrument:
The BX-IR 400 KA is the ideal tool for checking leaks inside valves. When the valve is leaked due to poor sealing or long-term wear, the leakage signal can be clearly detected through the valve internal leak detector. Applicable to industrial and civil fields such as petroleum, electric power, chemical industry, urban heating. The BX-IR 400 KA is used to detect leaks in various types of valves, leaks in pressure vessels and pipes. After instrument processing, it is converted into an audible sound signal. The signal strength changes can also be displayed on the LED bar graph. The frequency modulation function of the instrument can highlight the fault signal and significantly reduce the interference of external sounds, even if multiple valves that are closely arranged are not affected.
Second, the use of:
1. Open the lower battery cover of the handle and install a 9V battery to cover the battery cover.
2. Plug the headphone plug into the instrument jack
3. Install the inner leak probe: Unplug the scan probe and insert the inner leak metal probe into the instrument. The metal rod can be lengthened if necessary.
4. Pull the trigger when measuring.
5. When starting the measurement, the FM knob is placed at 20 or 30. If the measured signal is too strong, all the LED bar graphs have been covered, and the value can be adjusted to a larger value, and the signal intensity is adjusted to be lower in the middle of the LED bar graph. (To measure the same valve in the same gear to avoid misjudgment)
Third, the detection method:
Method 1: Touch the metal probe to the valve casing and the pipe wall on both sides of the valve. If the closer the valve is, the larger the indication value is observed, and the louder the sound is heard, indicating that there is leakage in the valve.
Method 2: Four-point comparison method, when the on-site interference is too large, the four-point comparison method is used to detect, and the on-site interference is sometimes large, leading to an error indication of valve leakage. At this time, the four-point method is adopted: two equidistant points on the upstream side of the valve (points A and B) are selected, and compared with the values ​​of two equidistant points (points C and D) on the downstream side of the valve. Compare the signal strengths of points A and B with the signal strengths of points C and D. If point C is higher than points A and B, the valve has a leak. If point D is higher than point C, the sound is from the downstream. At other points, there is no leakage in the valve.
Method 3: Detect valve leakage when there is large noise interference in the system. In the high voltage system, there are two cases where the noise generated by the valve leakage and other noise in the system are transmitted to the downstream side of the valve through the manifold, and the downstream side is determined to be high. Whether the frequency signal comes from valve leakage or other places can be done as follows.
1. Move the sensor probe to the suspect source (ie, pipe elbow or other valve), observe the meter indication and monitor the sound.
2. Touch the upstream side of the suspect source and observe the indicator value and monitor
Listen to the sound.
3. Touch the downstream side of the suspect sound source, and gradually move toward the measured area, observe the instrument indication value and monitor the sound, pay attention to the small pitch movement, such as moving every 15-30 cm, and pay attention to observe the change and sound of the instrument. Variety.
4. If the instrument indication and sound intensity decrease during the process of moving to the valve under test, the valve is not leaking.
5. If the instrument indication and sound intensity increase during the process of moving to the valve under test, the valve has a leak.
Fourth, the configuration:
1. Valve internal leak detector (including scanning probe) 1 set
2, valve inner leakage detection sensor 1
3, 1 pair of headphones
4, 1 ultrasonic collector
5, 9v battery 1 section
6, metal extension rod 3
7, 1 instruction manual
8, nylon instrument package 1
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