Helium Sniffer Testing Equipment for Air Conditioning Condenser
Evaporator Piping
According to the basic principles of helium leak detection, helium
as a tracer gas, the workpiece will be filled with helium, and then
through a helium leak detector leak can quickly and accurately
determine the accuracy of the workpiece’s leakage.
Technical Parameters:
| Workpiece | Air conditioning piping / coils |
| Tracer Gas | Mixture helium & nitrogen (30% helium + 70% nitrogen) or pure
helium |
| Leak Detection Rate | 2g/y, equal to 1x10-6Pa.m3/s |
| Leak detector setting accuracy | 1x10-8Pa.m3/s |
| Pressure for Gross Leak Detection | 4.0 Mpa (Downward adjustable) |
| Pressure for Fine Leak Detection | 4.0 Mpa (Downward adjustable) |
| Detection Method | Manually held sniffer |
| Evacuation/ filling/ recovery joint | 2 stations (independent), 2 connectors per station (only 1/4
thread, customer-supplied connector) |
| Test Cycle | 30s/pc (Excluding loading / unloading workpiece and hand-held sniffer
detection time) |
| Test Bench | 1500mm*600mm |
| high-pressure hose | 1.5m (4 pcs) |
| Platform height | 850MM |
| Equipment Composition | Operation platform + Helium filling & recovery system (pipes for connecting the two parties are responsible for the
customer) |
| Power Supply | Three-phase |
| Alarm | The system will alarm when the sniffer detects leakage signal |
Leak Detection Description:
Operator places the workpiece on the jig on the test bench, seals
the couplers of the workpiece with the jig manually;
After operator presses down “Start” button, high-pressure nitrogen
is injected into the workpiece automatically until the pressure in
the workpiece reaches the preset value;
System will stop nitrogen filling and automatically judge whether
the workpiece has gross leakage according to the pressure drop
value in the workpiece:
If the pressure drop value in the workpiece exceeds the preset
range within a defined period, that indicates the workpiece has
gross leakage. In that case, the gross leak detection process is
stopped; and the gross leakage and “NG” instructions are shown on
the operation interface; operator should click “Confirm” on the
operation board to acknowledge the test results; the high-pressure
nitrogen in the workpiece is automatically discharged until to a
pressure of 1atm; workpiece is unloaded manually;
If the pressure drop value in the workpiece does not exceed the
preset range within a defined period, that indicates the gross leak
detection of the workpiece test is passed, next process is
continued.
Workpiece is evacuated to the preset vacuum degree;
Preset high pressure helium is filled into workpiece;
Operator holds the sniffer to detect the helium around the
workpiece;
Determine the fine leakage of workpiece automatically:
System will sum all the leakage rate of all the leakage points
automatically, if the total helium weight detected exceeds the
preset range, that indicates the workpiece has a fine leak. In that
case, the fine leak detection process is stopped; and the fine
leakage and “NG” instructions are shown on the operation interface;
operator should click “Confirm” on the operation board to
acknowledge the test results; next process is continued.
If the total helium weight detected does not exceed the preset
range, that indicates the workpiece is qualified, and the OK signal
is given on the operation interface; next process is continued.
Helium in workpiece will be recovered until the vacuum degree
inside of workpiece reaches to preset value;
Air is charged to workpiece until to a pressure of 1atm;
Workpiece is unloaded by operator manually
