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 Bosworth Instrument Training Sheet Series
pH, ORP, Conductivity, Dissolved Oxygen
 
 
What is pH?
 
pH is a unit of measure (ranging from 0 to 14) indicating the degree of acidity or alkalinity of a solution. pH tests are the most commonly performed measurements in water analysis. Solutions with a pH less than 7 are considered acidic, solutions with a pH higher than 7 are known as bases, and solutions with a pH of exactly 7 are considered neutral. The pH scale is logarithmic, so, for example, if sample A is 1 pH less than Sample B, this means that Sample A is 10 times more acidic then Sample B.  A difference of 1 pH represents a ten-fold difference in acidity.
 
I need to measure pH in a semi solid like cheese or soil samples. What would be the best meter for this application?
 
A great meter for this application would the PH110. This meter has a flat surface electrode which makes it easy to get the pH reading. This meter also has a refillable electrode which greatly maximizes its useful life.
 
What is ORP?
 
ORP stands for Oxidation Reduction Potential and represents the oxidizing or reducing nature of a solution. The overall "reactive" tendency of a solution can be determined from ORP measurements.  The unit of measurement for ORP is mV.
 
Applications for pH and ORP Measurements
 
For chemical processes, pH and ORP are the most common measurement. Applications include electro­plating, waste water treatment, pharmaceutical testing, paper mills, food & beverage production, and environmental analysis. Note that ORP testing is becoming increasingly more common in waste-water treatment measurements.
 
What is Conductivity?
 
Conductivity is a measure of a solution's ability to conduct electricity. The unit of measure for conductivity is Siemens per centimeter. Large amounts of conductive material (metals, salts, etc.) in a solution, results in higher conductivity.
Conductivity Measurement Applications:
·         Wastewater and drinking water analysis
·         Environmental tests to determine the health of ponds, streams, wells, and other bodies of water
·         Manufacturing processes such as component or PCB rinsing
 
 
 
      What is a Dissolved Oxygen (DO) Meter?

The Extech Heavy Duty
407510 Dissolved Oxygen (DO) meter measures the oxygen concentration of a liquid. The units of measure for dissolved oxygen are mg/L (milligram per liter) and PPM (parts per million). The 407510 provides user calibration, temperature display (0 to 60oC), membrane electrode, and KCL reference solution. Salt water and altitude compensation adjustments are provided. 
Dissolved Oxygen Applications
 
DO measurements are used in applications where the amount of oxygen in a liquid has a critical effect on a manufacturing process, environmental test area, treatment plant, etc. Waste water treatment, fisheries, beverage production, and environmental water quality analysis all benefit from dissolved oxygen meters.
 
Why test for Chlorine?
 
Chlorine is the primary means of water treatment in the U.S., with approximately 80% of the municipal water systems disinfecting with chlorine. There are health and aesthetic problems associated with residual chlorine, however, and chlorine testing devices such as theCL200 Chlorine Meter are ideal for water analysis. The CL200 is a revolutionary, first of its kind measurement device that offers direct reading of Total Chlorine from 0.01 to 10.00 ppm. The advantages of the pen to other types of chlorine measurement methods include:  Easy to use and maintain, high accuracy, automatic calibration, and fast response. The CL200 offers simultaneous Chlorine and Temperature displays and a 15-reading memory storage.

Bosworth Instrument 1995 E. 55th St.  Cleveland, OH 44103  |  800-804-6216  |  info@bosworthsupply.com

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