Valve leak detector in the details 
 Valve leakage detector FH2001C 
 I. Introduction: 
 FH2001C pen within the valve leak detector is specifically present in the system leak check valves ideal instrument. When the valve is closed due to lax or leak due to wear in the house when the upstream side of the high-pressure gas or high pressure liquid through the drain holes in the downstream side of the formation of turbulence. Pores very small, turbulence generated in the vicinity of the downstream valve and even ultra-high frequency vibration or high frequency vibration, the high-frequency vibration signal leakage within the valve through FH2001C detector can be clearly received. Apparatus receives the signal through the digital conversion to digital conversion instructions and headphones can hear the sound signal. Through headphones, the first table indicates whether there is leakage of the valve can be judged. 
 Second, some of the features shown and the map shows: 
 1, the sensor jack, insert a special touch sensor leads. 
 2, special sensors. 
 3, low-voltage indicator, battery voltage decreases, the indicator light. 
 4, the display shows the signal strength within the drain. 
 5, the power switch. 
 6, headphone jack. 
 Third, use: 
 1, open the battery cover into a 9V battery, cover the battery cover. 
 2, press the power switch, instrument meter digital display appears, you can start measuring instruments, automatic shutdown after tens of seconds. 
 3, the contact sensor wire, the wire plugs into the instrument jack. 
 4, in front of the sensor connected to the metal probe, if necessary, rod and wire can be lengthened. 
 Fourth, the detection method: 
 The instrument is very simple to use 
 Method 1: the metal probe contacts on both sides of the valve and valve housing wall, away from the valve if the more recent observations indicate the greater value, and to hear the voice of the greater, indicating memory leak valve. 

 Method 2: Four-point comparison, when the interference field is too large, four-point comparison method to detect, site disturbance and sometimes large, resulting in valve leakage error indication. At this time a four-point method is: choose the upstream side of valve two equidistant points (A point and B point), the downstream side of the valve with two equidistant point (C point and D point) values ??to compare . To point A and point B and point C the signal strength of the signal intensity and D point of comparison, if the point C is higher than point A and B, indicating that the valve leaks, if the point D is higher than point C, indicating that the sound from the downstream The other point came, the valve does not leak. 

 Method 3: Test the system have a greater noise when the valve leakage, high-pressure system, there is the noise generated by valve leakage and system noise in the other passes through the mains to the downstream side of the valve either case, to determine the downstream side of the high-frequency signal is from the valve leaks or other places, according to the following methods. 
 1 will move the sensor probe suspicious sound source (ie: pipe elbow or other valves) to observe the meter indication and monitor the sound. 
 (2) exposure to the upstream side of the suspected source, observe and monitor the sound meter indicated value. 
 3 suspected source of exposure to the downstream side, and gradually move to the test area to observe and monitor the value of the sound meter instructions, pay attention to pitch movement, such as every 15 to 30 cm moving about, and observe the changes in instrumentation and sound change. 
 4 If you move to test the valve in the process of instrument instruction and sound intensity decreased, indicating that the valve does not leak. 
 5. If you move to test the valve in the process of instrument instruction and the sound intensity increased, indicating that the valve leaks. 
 5, configuration: 
 1, FH2001C pen valve leakage detector 1 set 
 2, sensor 1 
 3, the headset 1 
 4, the sensor wire 1 
 5,9 v battery a laminated 
 6, metal rod (probe) a 
 7, the instrument package 1 
 8, 1 instruction manual 
 Sixth, pre-service 
 ● manufacturers provide online pre-selection guide. 
 ● The instrument is shipped, the non-human causes damage due within one year manufacturers responsible for free repair time. 
 ● all failed after one year manufacturers responsible for maintenance, but proper collection of materials. 
 ● manufacturers provide technical phone support and online technical support.