I have a leak detection business for more some yrs Recently, after an extensive search we/I decided to purchase a gas/sniffer for our inventory.We had 2 choices, helium or a mixture of 95% nitrogen-5% hydrogen(a non-flamable mixer).They have no "field support available" none. Here is my question, knowing the mixture of 95%nitrogen & 5%hydrogen, I've been asked to use this instrument in copper lines underneath a slab. The system has water in it, H2O & I've searched & searched to find out if I have to drain this radiant system or I can "push" my mixture in the piping with water in the pipes & get the desired results. Some radiant systems are very hard to drain depending on the boiler & the piping configuration. Will the hydrogen mixer work or will the 2 molecules of hydrogen negate the hydrogen mixer and render the system useless