Description

CHEMets – Oxygen Dissolved Visual Kit

Manufactured:  CHEMets

Product Type:  Oxygen Dissolved Visual Kit

Catalog No.:  K-7511

Range:  0 – 20 ppb

MDL:  2 ppb

Method:  Rhodazzine D

 

Components & Accessories

• Oxygen, Dissolved ULR CHEMets Refill
• Sampling Tube
• Oxygen, Dissolved Comparator
• Mounting Clamp, Permanent

 

General Information

Sampling

The most critical part of any dissolved oxygen test is sampling. Incorrect sampling technique will cause false positive test results. For guidance on appropriate sampling protocol, view the video on the specific product page on the website.

The sample stream must be completely leak-free. To accomplish this, the sampling tube is vertically mounted with a tube of inert material connecting the sample point to the bottom of the sampling tube. Use stainless steel, type 304 or 316, or glass tubing with short neoprene connections. Do not use copper tubing, long sections of neoprene or other polymeric tubing.

Test Procedure

1. To remove trapped air bubbles, the system should be purged with water that is flowing at the fastest possible rate, and has a temperature of 180 – 210°F (80 – 100°C). New sampling systems should be purged for several hours, while those used routinely may require only a few minutes. When the system is fully purged, reduce the flow to 500 – 1000 mL per minute and cool the sample to ambient temperature
2. Place the ULR CHEMet ampoule, tip first, into the sampling tube. Snap the tip. The ampoule will fill leaving a bubble for mixing (fig. 1).
3. Gently invert the ampoule, allowing the bubble to travel from end to end for exactly 30 seconds. Dry the ampoule.
   NOTE: The bubble will travel most rapidly if the ampoule is held at a 45° angle while mixing.
4. Immediately obtain a test result by gently placing the ampoule, flat end first, into the comparator. Hold the comparator up toward a source of light and view from the bottom. Rotate the comparator until the best color match is found (fig. 2).