Knurled Head Screw
Occlusion Ring
Figure 28
Figure 29
Tube Stop Collar
White Reduction Connector
Preparing the Buffer Solution
The FX-1000p Amperometric Chlorine Analyzer is designed to use only 5% food grade distilled white
vinegar as a buffering agent to lower the pH in the measuring cell.
The recommended white distilled vinegar should be available for purchase in any local food store.
The pH of distilled white vinegar generally ranges from pH 2.3 to pH 2.6; its acidity must be at least
4% and no more than 7%.
Distilled white vinegar is used because it does not have a chlorine demand; it is eliminated during the
distillation process. Therefore:
Do not use any other food grade vinegar or flavored vinegars; they will introduce a
chlorine demand to the sample cell and thus provide inaccurate measurements.
Using any other buffering agent may void the warranty.
Store vinegar unopened at room temperature; it does not need refrigeration because of its acidity.
Studies by the Vinegar Institute have confirmed the shelf life of vinegar is almost indefinite and that
distilled white vinegar will remain virtually unchanged over an extended period of time. The expiration
date, typically two years, found on distilled white vinegar packaging is a requirement for a product
classified as food.
The Food and Drug Administration has stated that diluted glacial acetic acid is not vinegar.
Startup
22
FX-1000p
