The Basics of Meters
There are three means of measurement that are essential in determining the physical properties of a substance…balance, pipettes and meters.
Electrochemistry is defined as the branch of chemistry that examines the phenomena resulting from combined chemical and electrical effects. Meters are used to measure pH, mV, conductivity, ion specific analysis, salinity and dissolved oxygen. Certain meters have the ability to measure different parameters or simply just pH, mV and temperature. The industry the meter is being used in will help determine what type of meter is right for you.
When purchasing a meter, it is important to select an electrode that is right for the application. If the sensor is low grade it could produce inferior results and slow measurement times so it is important to make sure your electrode is made of high quality materials and construction. Typically the life span of electrodes are 2-5 years and they may start to degrade after this time.
There are many different electrodes available and most have a universal BNC connector which allows one manufacturer’s electrodes to work on another’s meter.
Here are five important questions that can help you select the proper electrode:
- What type of samples are you testing? Aqueous, liquid, solid…
- Determines the tip style…speartips, bulb type, flat surface
- Are you working at extreme temperatures or sample types? Is temperature important?
- Extreme Temperatures determine body type (glass or epoxy)
- Temperature Sensors do not come on every electrode make sure to confirm if there is a connection for it
- Sample types determines junction type and construction
- What is more important- accuracy, speed and longevity or price and easy maintenance?
- Accuracy, Speed, Longevity- GoldLINE series
- Speed- liquid filled electrodes, platinum reference over ceramic or fiber
- Longevity- glass body over plastic
- Are you using TRIS buffers?
- Make sure electrode is TRIS compatible or TRIS impervious
- Do you have any “no glass” requirements?
- FDA requirements may state no glass, make sure no glass sensing membrane
To learn more about our electrode and meter lines, click here! If you have any questions about which meter is right for you, please call 800-451-9593.