Macherey-Nagel
On demand
Macherey-Nagel test strips for chlorine dioxide, in 3 presentations covering different measuring ranges.
91355
91357
91363
A semi-quantitative test strip for chlorine dioxide, a disinfectant used where chlorine's by-products are a problem. Dip it, wait the stated time, and compare the pad against the colour scale on the tube.
It kills biofilm that chlorine leaves behind and does not form the trihalomethanes chlorine does, which is why it appears in beverage plants and hospital water systems. But it is unstable and has to be generated on site, so the concentration actually delivered is rarely the concentration set.
A strip gives a range, not a figure. That is enough for the great majority of decisions — dose or do not dose, discharge or hold, keep running or stop — and it gives the answer where the sample is, in about a minute, with no instrument to calibrate and nothing to carry back to a laboratory.
When a number has to be defensible — a regulatory report, a dispute, a limit you are close to — a photometer or a laboratory method is the right tool. The strip's job is to tell you whether you need one.
Free chlorine interferes: if both are dosed, measure chlorine first and subtract, or the dioxide reads high.
Supplied in 3 presentations covering different measuring ranges. The range is chosen by model: 1, 15, 3000.