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We interpret the difference between monocrystalline silicon pressure transmitter and monocrystalline silicon differential pressure transmitter from two aspects, one is the working principle, and the other is the appearance.
1. Working principle of pressure transmitter
The monocrystalline silicon pressure transmitter includes two functional units, the main unit and the auxiliary unit.
The main unit includes the sensor and the process connection. The working principle is as follows: the process medium exerts pressure on the measuring diaphragm through a flexible, corrosion-resistant isolating diaphragm and filling liquid, and one end of the measuring diaphragm is connected to the atmosphere (for gauge pressure measurement) or vacuum (for absolute pressure measurements).
in pressure transmitter manufacturer, When the measured pressure is transmitted to the sensor silicon chip through the measuring diaphragm and filling liquid, the resistance value of the sensor silicon chip changes, resulting in a change in the output voltage of the detection system. The output voltage is proportional to the pressure change, and then converted into a standardized signal output by the adaptation unit and the amplifier.
2. Working principle of differential pressure transmitter
The monocrystalline silicon differential pressure transmitter includes two functional units, the main unit and the auxiliary unit.
The main unit includes the sensor and the process connection. The working principle is as follows: The sensor module adopts all-welded technology and has an integral overload diaphragm inside, an absolute pressure sensor and a hvac differential pressure sensor. The absolute pressure sensor is only installed on the high pressure side of the sensor bellows as a reference value for static pressure compensation.
The negative pressure side of the differential pressure sensor is connected to the low pressure chamber of the sensor bellows. When the measured differential pressure is transmitted to the sensor silicon chip through the isolation diaphragm and the filling liquid, the resistance value of the sensor chip changes, resulting in a change in the output voltage of the detection system. The output voltage is proportional to the pressure change, and then converted into a standardized signal output by the adaptation unit and the amplifier.
The monocrystalline silicon pressure transmitter adopts high-precision silicon sensor technology, a new type of intelligent high-precision transmitter, based on electronic components through a microprocessor, to achieve communication with field devices. Single crystal silicon pressure transmitters include gauge pressure, differential pressure, absolute pressure, high static pressure differential pressure and many other varieties. Used in petroleum, chemical industry, electric power, metallurgy, water affairs, brewing and other industrial fields.
1. Direct connection
The direct connection type generally measures the pressure of the medium. The connection method is M20*1.5 or 1/4NPT external thread or internal thread connection.
2. Indirect connection
The non-direct connection type is similar to Rosemount's coplanar type. The bottom is connected to the pipeline by means of a valve group or a flange, and the pressure or differential pressure of the medium can be measured. Generally, the differential pressure is the majority.
Precautions:
(1) After calibration, the instrument is packed in a carton (GB/T 13384-2008) to protect it from damage.
(2) Storage of the instrument does not require any special handling. There is no limit to the storage period, but the shelf life is still consistent with the period stipulated by the company.
(3) The product nameplate includes relevant information such as serial number, measuring range, accuracy level, input voltage, output, and date of manufacture. Be sure to provide the instrument serial number for important inquiries.
