Negative pressure transmitter

0% is fine, 100% is fine too; it’s up to you to decide how to use it... If he doesn’t behave, then smack him in the face, kick him in the stomach, and so on...

Shouldn’t the differential pressure value be 0 if there is none?

If it’s a differential pressure transmitter, if you connect the pressure tap to the negative pressure side, it will display a positive value; the zero point will then correspond to 0.

It’s hard to say; for a vacuum gauge, it mainly depends on how the range is set. Please send over the range settings, and ours is from -1 to 1, with 50% corresponding to atmospheric pressure

This post was last edited by 1111111 on 2017-12-20 21:51 ..............

Can it have a negative pressure of 0, corresponding to 4mA, or a full negative pressure, also corresponding to 4mA? You can calibrate it however you want, and use it in whatever way suits you. The so-called 0% and 100% values are all set manually, right? Do you understand?

-100kPa~0kPa corresponds to 4~20mA, and 0kPa~-100kPa also corresponds to 4~20mA; the instrument can handle both of these scenarios. For smart meters, you just need to make the necessary settings, and it will work fine

Help, please! A pressure transmitter with the same range, used to measure gauge pressure in the range of 0–25 kilograms; it can measure both air pressure and oil pressure, at a temperature of around 60°C. What is the difference between ceramic measurement units (sensors) and stainless steel measurement units (sensors)? Which one is more suitable?

Ceramic sensors generally refer to ceramic piezoresistive pressure sensors; they can be considered to be the lowest-grade pressure sensing elements. They have low measurement accuracy, significant drift, weak interference resistance, and also have shortcomings in terms of shock resistance and lifespan. . . If you can avoid using it, then don’t use it. Stainless steel sensors generally refer to oil-filled silicon piezoresistive pressure sensors; their performance is 5 to 200 times better than that of ceramic piezoresistive sensors. In terms of cost-performance ratio, they are far superior to ceramic sensors. What was mentioned above applies to the sensor itself. When comparing the performance of pressure transmitters made using these two types of sensors, it is also highly dependent on the quality of the packaging structure and the effectiveness of the amplification circuit; therefore, it is not possible to judge the quality of the pressure transmitter solely based on the sensor. . . The actual differences in piezoelectric performance must be tested on a calibration bench, with the measurement data serving as evidence.