Leak Testing

leak_detection_probe_tip
The Probe Tip Protection Cap is used on your hand probe (P50 and PK50) for protecting your test object from scratching during leak detection. It can also be used to water protect the probe tip.

The probe tip protection cap comes with a filter, which protects the probe tip from dust and other external contamination. Since the hand probe also contains a filter, it is not necessary to keep both of the tip filters. You can therefore remove the tip filter belonging to the probe tip.

Simply attach the probe tip protection cap to the probe tip by pressing hard until you hear a clicking sound. The probe is now ready to use without worrying about damaging your test object. To remove the probe tip protection cap, use the sensor key (included accessory with the hand probe). Attach the sensor key at the bottom of the probe tip protection cap and pull with one finger on each side of the probe tip.

ANSWER:
With the use of a probe tip protection cap (accessory to P50 Hand Probe and PK50 Hand Probe) and PTFE tape (plumbers tape) you can easily protect your probe tip from water.
All you need is water protecting tape (PTFE) and the probe tip protection cap (accessory)
Firstly, remove the white filter from the protection cap. Apply PTFE tape on the probe tip and attach the protection cap on top. To attach the probe tip protection cap correctly, press hard until you hear a clicking sound. This allows for leak detection on wet and sticky objects with a simple and cost effective solution. The PTFE tape must be replaced when damaged.

(Click here to see the demo video)

ANSWER:
Yes, most probably! AND less temperature dependent and less wet. But we need to know more about the leaks you want to find and the circumstances around your testing. Please contact us for a more detailed answer.
ANSWER:
Yes, this would be a great solution since INFICON hydrogen leaks detectors are designed to react and recover quickly after gross leaks.
ANSWER:
Water bath (water dunking) is difficult because so much of the result is dependent on the operator, the geometry of the product, the time and way it is immersed and not least the quality of the water. We have developed a software – Bubbelizer – which helps you calculate (and animate) flow into bubbles and vice versa. This will give you an idea of where you are. But do contact us for a discussion.
ANSWER:
Contact your local gas supplier and ask for the standard 5% Hydrogen in Nitrogen mix. It is commonly used as a shielding gas for welding and other industrial applications and goes by names such as
– Formier5 or Formiergas 5/95 (AGA/Linde)
– Naton-5, Nidron5 (France)
– N2-H2 95/5 (Air Liquide)

The gas supplier sometimes tries to sell you a very expensive specially mixed gas. The price for this one is many times higher than the standard 5%H2 in Nitrogen mix. Do not accept this and insist on getting the standard industrial grade mix. The non-negotiated gas price should be about 0,01 Euro per liters.

See Demonstration Video

There are two ways to calibrate our hydrogen leak detectors; With a reference gas or a calibration leak. The reference gas, available at gas suppliers, has a known concentration of hydrogen (recommend 10 ppm) which is used to calibrate the leak detector. A reference leak, supplied by INFICON, has a fixed leak rate (flow or g/y) which is used to calibrate the detector. Both methods take less then 2 minutes to perform.

ANSWER:
It is the nitrogen that does the trick. No combustion can take place without oxygen. The 4% limit refers to hydrogen in air which contains oxygen. When the 5% hydrogen/nitrogen mix is released into the air it dilutes the air. No matter how much you release, there will either be too little hydrogen or too little oxygen to allow the gas to ignite. Any mix of hydrogen and nitrogen containing less than 5.7% hydrogen is classified as a non-flammable gas. The safety margin is actually greater than that. Even a 10% hydrogen/nitrogen mix is extremely difficult (but not impossible) to ignite.
ANSWER:
The Hydrogen gas-mix costs about 5 USD per 1000 liters which makes it the least expensive tracer gas of all. How much you will have to use depends on what you are using it for. You can calculate the gas per test by knowing the internal volume of the object and the pressure used at the test. Then you just multiply by the number of test per day/month/year and you will get your consumption figure.
ANSWER:
Normally twice a year at continuous use. But in many cases less than once a year. It´s like answering “How long will a light-bulb last?.” The sensor is not used up in the same sense as a light bulb but it ages and may become insensitive over time. It all depends on how much you use it.
ANSWER:
a) when you are looking for leaks smaller than what pressure decay can find.
b) when you have variations in temperature in your test objects
c) when you have soft objects
d) where you risk having leaking connections
e) when you also want to locate your leaks
ANSWER:
For certain applications you can speed up the process by using a bit of plastic foam, 5mm thick and of open cell type. If you apply the foam around for example a tube joint, it is often enough just sticking the probe into the foam at one point and get a gas indication even if the leak is on the other side of the tube. This is of course dependant on the dimension of the tube in question. You will have to try this specifically for your case. The reason why this happens is that the foam does not hinder but actually protects the gas from being vented away by the normal movements (draft) of the air. The gas seeps throughout the foam which will give you a gas indication whereafter you can remove the foam and start locating the leak. The foam actually gives you a fast and early indication if it is worth while to search the entire joint. Try it out and please let us know what you think about it.
THE GAS / Can the hydrogen and nitrogen separate? If so is there a possibility of accumulating dangerous levels in my building?

ANSWER:
Hydrogen and nitrogen are totally soluble in each other. Once mixed they will not naturally separate. Even heavy gases properly mixed will stay mixed. Carbon dioxide, for example, is a heavy gas and will stay at floor level, however when properly mixed with the air, it will not exhibit this feature. Even liquids, if totally soluble in each other, stay mixed. For example, no matter how long you left a bottle of liquor standing up, the alcohol, which is lighter than water, will not float to the top

ANSWER:
It depends on the way you do the test. If you move the sensor probe along the surface of your test object you can detect leaks down to 5 x 10E-7 cc/s (equivalent to 0.1 g/y refrigerant gas). If you use a clam shell type of arrangement (locally enclosing the test point) you may detect leaks down to 2.5 x 10 E-6 (equivalent to 0.5 g/y refrigerant). If you need to do an integral test on the entire object in order to detect leaks from anywhere on the object you will have to use an accumulation chamber. The sensitivity will then be proportional to the time you allow gas to accumulate in the chamber and inversely proportional to the air volume into which the gas spreads.