Uses Of Keller Pressure Sensors
This article considers the various uses of Keller pressure sensors, which measure the pressure for the purpose of making some corrections if this value is not within the targeted range. It is common for these devices to have a sensing diaphragm where the degree of movement is proportional to the pressure intensity. Standard applications for these devices are for the monitoring and regulation of various everyday applications. They may also be utilized for the indirect measurement of certain variables, such as the water level, speed, fluid flow, and altitude. Meanwhile, a special application for devices like the Keller pressure sensors is for use as HVAC pressure sensors for monitoring and regulating the differential pressure of air flow in air conditioned buildings.
Keller pressure sensors may also be applied for the dynamic measurement and monitoring of high speed pressure changes. Such devices can be utilized for checking the combustion pressure in a gas turbine or engine cylinder in real-time. The Keller Series 8 pressure transducers can be useful in such applications. These models are very strong and can withstand even the rapid rise of pressure up to 400 to 1000 psi. They are provided with a piezoresistive silicon wafer, which means that the resistance of this semiconductor increases with pressure. The surrounding environment cannot affect the chip because it is contained in a housing made from stainless steel. The sensing diaphragm is round in shape and is concentrically corrugated. This assembly is filled with silicone oil to allow the communication of the pressure to the sensing component from the diaphragm.
These pressure transducers may also be used in conjunction with special devices, such as the Barksdale pressure switches. Pressure switches function as fail-safe devices to prevent damage to machines and equipment if the pressure exceeds a certain threshold or improper operation of the system when the pressure drops bellow a certain value. The electric circuit supplying power to the system is made to go through the pressure switch so that when the pressure exceeds the maximum allowable value, the electric power is turned off.
Other examples of the Keller pressure sensors are those that belong to the Series 3L to 10L, which is a range of devices that have sensing diaphragms without crevices and have smaller capsule dimensions. The smaller size was made possible by a unique laser welding technique that can handle very thin isolation diaphragms made from stainless steel. While the pressure range is dependent to some degree on the diameter of the diaphragm, higher pressures can still be handled by these smaller transducers. This is made possible by the thermal expansion of oil that produces an internal pressure because of the resistance of the diaphragm. Another Keller pressure detector is the Series 10 OEM device that is completely compensated and designed for operation at 10 VDC. Its core sensor that has been tested in many operations is a strain gauge bridge that is made from silicon. A male pressure port is also included in the assembly to ensure media integrity and compatibility.
