Application Note by Using Nutech 2203 Dilutor for Canister Humidification

Abstract

By using Nutech 2203 Dilutor Liquid Injection function you may do the canister humidification quantitatively and easily. The humidification process will be controlled by computer program and a proprietary adapter is used to make sure the humidification process is going correctly.

Introduction

USEPA TO-15A and TO-15 method need to humidify the canisters before they are used for standard making or sampling. Humidifying the canisters is an especially important procedure to make sure the standard is correctly made, and the canisters are TO-15 or TO-15A compliant. By Using Nutech 2203 Dilutor Liquid Injection function you may do the canister humidification accurately. The humidification process will be controlled by computer program and a proprietary adapter is used to make sure the humidification process is quantifiable as well.

1 Experiment

1.1 Configuration of Used Instruments

Nutech 2203 Dilution System or 2202A Dilution System, Liquid Adopter, and dilution gases. Cleaned Canister, 3L, 6 L or other size Summa or Silica coated Canisters, Ultra-pure water, or distilled water.

Photos to show configuration and assembly of 2203, Liquid adapter, Syringe as above. A special syringe VICI adaptor with leading guide ferrule and septum to introduce the pure water from the syringe to the canister. To make sure the water is entering into canister as vapor but not liquid drops the 1/8” leading tube is bent or packing with some glass beads. The injected water firstly on the tube wall or the surface of glass beads to form a water film and then it is changed to vapor by the slow flow of the carrier gases (dilution gases). This may take 5-15 minutes, but it makes the humidification process identical each time and makes sure there is no water stuck somewhere in the path. Comparison with all other humidification methods this is more reliably and repeatable. Using a heated strip (Optional, 2203 provided and controlled) to heat the adapter to 120°C may make sure the water is evaporated.

2 The Steps to humidify the canister

2.1 Use the follow table to find out the water volume you will need to humidify your canisters.

2.2 Connect canister to 2203 as shown as below:

Make sure the adapter is correctly connected and it is leakage free.

2.3 Turn on in computer application interface as below:

In liquid injection section set the time to about 3 minutes, that is the time for you to add pure water. Set the final pressure as 3 psi (5‘’ Hg), that is your finished pressure of humidification.

Click Liquid to start flashing and then inject water from the adapter as show as below:

When finished you may wait 30 minutes or one hour then start your standard preparation or take the canister away for any other use.

3 Conclusion

Using liquid injection function of Nutech 2203 dilution system you may make your canister humidification is quantitative and easily. You may also combine the humidification and dilution together to make the calibration standard as one simple set up and one time. The water will be entering into the canister by a constant flow without losing water on the wall of the tube or other surface. The humidification process will be based on the controlled SOP and will be more reliable.