Instruments for Measuring Water Quality
Below is a selection of the most commonly used tools and types of equipment used. For each type, there is a massive variety of different versions available, some cheap and simple, others far more advanced. Many models combine several functions into more expensive models. In any case, this should prove to be a useful introductory guide to anyone getting into the industry.
pH Meters measure the acidity or the alkalinity of a solution of water. They typically comprise of a probe that is submersed into a body of water and a meter or recorder that will read data from the probe and display this data for the reader to interpret.
Used to measure the pH of water, but can be used with many other liquids. Is composed of a specialised probe and a meter that receives and displays data gained by the probe.
Dissolved Oxygen Meter
A dissolved oxygen meter is used to determine the amount of oxygen that is present in a body of water. It is possible to get meters that give a quicker reading directly to the user through a digital panel or you can invest in a device that can be left in a body of water to record the levels of dissolved oxygen in the solution overtime so that this data can be analysed over a period of time.
Biological Oxygen Demand (BOD) Meter
A Biological Oxygen Demand meter is useful for determining the amount of dissolved oxygen that is currently required by the organisms that are living in a body of water. These meters, along with Dissolved Oxygen Meters can help to determine whether a body of water is of sufficient quality to support extra growth and population of organisims in a body of water.
Temperature Measuring Devices
Measuring the temperature of a body of water can be a simple affair of dipping a probe in a body of water and measuring the temperature much like a simple thermometer. However, in many cases it is important to consider the temperature of a body of water over longer periods of time, and many devices will allow the user to monitor the temperature of a body of water over a longer period of time, taking readings at a specific period and storing those readings for furhter analysis at a later date.
The conductivity of a solution is a measure of the ability for that liquid to conduct electricity. The solids and particles in a body of water can alter it's conductivity and so these meters can give some indication of the solids that are in the solution being tested. Typically, these meters will measure the conductivity in ohms.
A flow meter presents a method to measure the apparent flow of a body of water and presents the user with information about the overall movement of a solution.