Dwyer Instruments offers many electrical switch products that make or break a contact based on sensing a parameter such as pressure, temperature, level, and so on.
Most switches are single pole double throw, often referred to as SPDT. This type of switch has one normally open contact and one normally closed contact. Switches can also be double pole double throw, or DPDT, that have two normally open and two normally closed contacts. Single pole single throw switches with just one contact are also available and are specified to be either normally open or normally closed.
Continue reading “What is Deadband? Switch Actuation and Deactuation”
Calibrating measurement instrumentation is something that should never go overlooked. To calibrate instrumentation means to determine, check, or rectify the graduation of any instrument giving quantitative measurement. Calibrating a device ensures that the instrument will properly measure within the desired range for your application. This is important because a properly calibrated measurement device will help the user to maintain his or her system. A device can be calibrated either at the factory where the device was manufactured or within the field. Calibration certificates may be obtained once a device has been calibrated. 
