Water / Wastewater 15
are subjected to a rigorous quality control process where product performance is verifi ed with certifi ed oxygen gas standards, ensuring accurate results. In addition, CHEMetrics is the sole source supplier of the test kits specifi ed in ASTM D5543-15, Standard Test Method for Low-Level Dissolved Oxygen in Water.
CHEMetrics® Test Kits are
commonly used as a primary means to measure DO in boiler systems. They are also used as a secondary means to verify online equipment readings or as a backup method when online equipment is out of service.
1CHEMetrics®
Visual Test Kits: K-7511, K-7518, K-7540 and K-7599
CHEMetrics test kits are equipped with a special “sampling tube” that is vertically mounted and connected to the sampling port of the boiler system.
Sampling and Analysis
Each online analyser continuously monitors a single location, typically near the discharge side of the boiler feedwater pump. A single CHEMetrics portable test kit, on the other hand, can be moved from one sampling point to another to allow for testing at the deaerator or any potential leakage points throughout the system.
For both online and test kit methods of analysis, it is imperative that the sample water not be exposed to the air. Atmospheric oxygen would contaminate the sample, causing erroneously high results. Therefore, collection of a grab sample is unacceptable for DO analysis.
A continuous fl ow of sample through the tube prevents contamination from atmospheric oxygen. When the operator submerges the vacuum-sealed ampoule in the fl owing sample and snaps the tip, sample is drawn into the ampoule. The highly sensitive colorimetric Rhodazine D™ reagent reacts instantaneously to produce a pink color.
The color intensity is visually matched to a color comparator to determine the DO concentration. CHEMetrics also offers a Comparator Light Source (CLS) for use in low-light conditions. A video illustrating the use of CHEMetrics DO test kits is available on all ppb DO product pages at
chemetrics.com.
Conclusion
Dissolved Oxygen must be monitored and controlled to avoid catastrophic failure of steam-generating boiler systems. CHEMetrics’ portable, easy-to-use Dissolved Oxygen Test Kits1 provide plant operators with many advantages when used as a primary monitoring method or alongside online equipment for DO testing. With sensitivity down to 2 ppb, CHEMetrics® ampoules employ an ASTM method for measuring trace levels of DO in boiler applications.
For more information on dissolved oxygen and other test kits applicable to industrial water treatment, please visit
chemetrics.com.
Author Contact Details CHEMetrics • 4295 Catlett Rd., Midland, VA 22728 • Tel: +1.540.788.9026 • Email:
technical@chemetrics.com • Web:
chemetrics.com
WWW.ENVIROTECH-ONLINE.COM
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68
