The pH of Drinking Water The pH of drinking water is a vital measurement. If the pH is too low, or acidic, the water will be corrosive to the distribution system and water pipes in homes. The pH of water also influences other properties including taste, odor, clarity, and efficiency of disinfection. In the United States, the pH of water is determined by a pH meter according to EPA method 150.1 and Standard Methods 4500-H. Most drinking water plants use surface water (lakes, rivers, and streams) or groundwater as their point source. Surface water is typically lower in mineral content, which results in lower EC/TDS readings. Groundwater that has percolated through limestone, dolomite, or gypsum will have a relatively higher mineral content. Depending on location, there are sources of groundwater that can be very low in mineral content. Measuring the pH of water that is low in minerals can be difficult. The lower the mineral content the less conductive the water will be. Low conductivity water presents a challenge since the pH meter is an electrochemical system that relies on the solution being measured to be conductive. The HI99192 uses the FC2153 amplified pH electrode. The FC2153 has three ceramic junctions in the outer reference cell that allows for pH measurement in low conductivity solutions. FC2153 Amplified pH Electrode • Built-in temperature sensor · For automatic compensation of temperature variations • Refillable pH electrode • Amplified electrode · For fast, stable response that is immune to electrical noise due to humidity • Triple ceramic junction design The HI99192 drinking water pH meter uses the glass body FC2153 amplified pH electrode. The amplified electrode provides a fast stable response that is immune to electrical noise due to humidity. The electrode contains an internal temperature probe to allow for automatic compensation for any variances in temperature. The electrolyte solution in the electrode is refillable. An integral part of any pH electrode is the reference junction. The reference junction allows for the flow of ions located in the reference cell into the sample being measured. The ions provide for an electrical connection between the reference electrode and the indicating electrode. A standard pH electrode will use a single ceramic junction that allows for 15 to 20 μL/hour of electrolyte to flow. The FC2153 has three ceramic junctions providing for 40 to 50 μL/hour of electrolyte to flow. This increased flow provides a greater continuity between the reference electrode and the indicating electrode, making it suitable for water with low ionic strength. To optimize the flow from the electrode, the refill cap should be unscrewed; this allows for positive head pressure to be created, allowing for the electrolyte to flow more easily into the sample. Triple ceramic junction * Limits will be reduced to actual sensor limits 2 pH 2.115 www.hannainst.com | portable
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