Note, a fresh sample of condensate should be drawn for this analysis. Great care should be taken in sampling to exclude reaction of the sample with atmospheric oxygen. For this purpose, use a 60 ml stoppered glass bottle. The sample point should be fitted with a sample cooler, capable of cooling the sample to below 30°C.

DEHA - Recommended Limits in condensate: 0.08 - 0.30 PPM DEHA.

DEHA Test

1. Fill the 60 ml bottle with sample direct from the sample cooler by immersing the outlet tube to the bottom of the bottle. Let the sample flow and fill the bottle and overflow for one minute.
2. Gently remove the bottle from the sample outlet tube so that the sample continues to overflow.
3. Gently place the stopper in the bottle so that a small amount of sample is expelled and that no air bubbles are trapped under the stopper. 
4. Cool the outside of the bottle with cold running water if the sample feels warm. Remove the stopper. 
5. Carefully pour the sample into a 10 ml moulded cell, filling to the 10 ml line. 
6. Transfer this 10 ml into the amber glass bottle by pouring slowly down the side of the bottle.
7. Add 6 drops of DEHA test solution by holding the plastic bottle vertically and squeezing gently. Swirl to mix. 
8. Now add one DEHA test tablet to the bottle. Crush and mix well to dissolve. Allow to stand for exactly 10 minutes. 
9. Whilst waiting, decant another 10 ml of original sample into the 10 ml cell and add one DEHA test tablet. 
10. Crush and mix well to dissolve then place the cell in the left hand compartment of the comparator. Slide the DEHA disc into the comparator. 
11. After the 10 minute standing period is complete, pour the test solution from the amber glass bottle into a clean 10 ml cell and place in the right hand compartment of the comparator. 
12. Immediately match the colour against the disc by holding the comparator facing a good source of daylight if possible. 
13. Record the reading as ppm DEHA against the date on which the test was taken.