How to Keep the Sensing Diaphragm's Performance of Pressure Sensor?
As with all continuous output pressure sensors, regardless of the application, the most sensitive component to the sensing diaphragm and most critical to the function of the pressure sensor is the sensing diaphragm. If it doesn't work, your readings will be incorrect, or in extreme cases, you will have no readings at all.
So in the world around us we often hear "don't do this" or "don't do that", let's try a more positive approach. If you follow these 5 tips, you'll keep your pressure sensor and its sensing diaphragm in good shape.
5 tips for keeping performance of sensing diaphragm of pressure sensor
- Know the pressure rating of the pressure sensor (overpressure and burst pressure)
Many pressure transducers have an overpressure rating of at least 2x (or twice the full scale pressure of the pressure transducer). This does not necessarily mean that the transducer will function properly when overpressured. Instead, in many cases, as long as the pressure A sensor is rated no more than twice its rated pressure before it can be recalibrated or serviced to return it to normal operation. Burst pressure is the pressure that will cause the pressure sensor to become irreparable and is usually listed as the pressure sensor full scale three times the pressure.
- Torque pressure sensor is not enough to prevent full scale leakage
The torque applied to the pressure sensor mounting threads during installation is usually transferred to the diaphragm to some extent. If these torques are too high, they will compress the sensing diaphragm, causing a change in the output calibration of the pressure sensor. To minimize torque on the pressure sensor diaphragm, use a torque wrench when installing the pressure sensor. Manufacturer recommended settings may vary, but we recommend a maximum setting of 43 Ft*lbs (58.3N* m).
- Know never to poke or tap the pressure sensor diaphragm to change the output
It is commonplace among users to tap different parts of the pressure sensor diaphragm with a pointed object like a pen or tip to adjust the output. In theory, hitting the center will move the output up and hitting the side will move the output down. While this can temporarily adjust the pressure sensor output, it also interferes with the adhesive layer behind the diaphragm, causing the pressure sensor output to drift. Not only is poking the sensing diaphragm an unreliable method of calibrating the pressure sensor, it is also dangerous to the health of the pressure sensor: the sensing diaphragm is easily damaged, and poking or knocking the sensing diaphragm will also void the warranty.
- Understand chemical compatibility of pressure sensors
Pressure sensors are often installed in corrosive environments. Corrosive environments may include gaseous or liquid contaminants formed from strong acids, bases, or hydrocarbons, and the degree of corrosiveness depends not only on the contaminant, but also on the materials with which it can interact. Therefore, the chemical compatibility of the pressure sensor with the substances it will come into contact with must be known.
The most critical parts of a pressure sensor are its wetted material and sensing diaphragm. If the materials of the sensing diaphragm are not chemically compatible, the pressure sensor is guaranteed to fail and the electronics within the pressure sensor may be at risk. If the wet material of the pressure sensor is not compatible with the substance being measured, the pressure sensor is at risk of physical failure and a leak in the system.
- Know if high vibration will be a factor in your application
Heavy-duty applications are often accompanied by high vibration. The sensing element of a pressure sensor can fail without the additional protection of constant high vibration, which is usually done by adding more epoxy to the pressure sensor at the time of manufacture, which will prevent stress during use Excessive movement of sensor element.