Using the hydrostatic method to directly and accurately measure the level in the tank, and through the volume and density of the oil, the weight of the oil is directly derived, only the emergence of intelligent transmitters that can compensate for the temperature and linearity, so that the accuracy of 0.01%-0.03% has become a reality.
Categorization
Diffuse Silicon Pressure Transmitter
Medium pressure through the isolation diaphragm and silicone oil transfer to the pressure sensitive chip, the chip diffusion and four resistors and the composition of the Wheatstone bridge, when the pressure changes in the two diagonal resistance increases, the other two diagonal resistance decreases in the constant current (about 1mA) under the action of the output 50-100mV voltage signals, through the conversion module output liquid pressure is proportional to the 4-20mV current signal.Diffusion silicon pressure sensitive devices are characterized by high sensitivity output and high measurement accuracy.Diffusible silicon sensors can operate at 150-250 degrees Celsius for long periods of time.
Ceramic Pressure Transmitter
It is the use of a special positively proportional piezoresistive effect of the material, through the thick film technology printed on the ceramic diaphragm, the medium pressure directly on the other side of the ceramic diaphragm, when the pressure changes, through the ceramic diaphragm to the ceramic diaphragm has a piezoresistive effect of the material on the composition of the Wheatstone bridge produces a resistive change in a constant excitation voltage under the action of the output mV voltage signal.Through the conversion module, the output is proportional to the pressure of 4-20mV current signal.Ceramic sensors can be in contact with most media due to the corrosion resistance of the ceramic diaphragm and have a low temperature coefficient.
Equipment Characteristics
It can convert the changes of various level parameters into standard current signals, which can be remotely transmitted to the operation and control room for centralized display, alarm or automatic control by secondary instruments or computers.Its good structure and installation can be applied to high temperature, high pressure, strong corrosion, easy crystallization, anti-clogging, anti-crystallization and solid powder, granular materials and other special conditions of the liquid level, level or level of continuous detection, can be widely used in a variety of industrial processes in the detection and control.
Characteristics:
Simple structure: without any movable or elastic elements, so the reliability is very high and the maintenance is very low.
Easy to install: the internal structure especially shows this feature, without any special tools.
Convenient adjustment: the two potentiometers of zero and range can be used to migrate the zero point or change the range arbitrarily within the effective range of liquid level detection, and the two adjustments do not affect each other.
Wide range of applications; suitable for high temperature, high pressure, strong corrosion and other media level measurement.
Main technical indicators
Effective detection range: 0-0.2-20m
Accuracy: 0.5 level, 1 level, 1.5 level
Pressure range: negative pressure, atmospheric pressure, high pressure (below 32MPa) Operating temperature: -50 ~ 240 ℃
Ambient temperature: -20 ~ 75 ℃
Applicable media: acid, alkali, salt, or any medium that is non-corrosive to PTFE Output signal: 4-20mA, 2-wire
Power supply:Load resistance 0-750Ω DC24V
Fixing mode: threaded installation M20 × 1.5, M27 × 2 Flange installation DN15, DN25, DN50, DN80
Field display: analog display 0-100%, digital display, field depth
