A differential pressure sensor is a sensor used to measure the difference between two pressures, and is generally used to measure the pressure difference between the front and back ends of a certain equipment or component.
It is mainly used to measure the exhaust pressure difference between the front and rear channels of the exhaust particle trap (DPF) of the car engine.
In order to meet the requirements of the emission code, the general method is to place a trap in the exhaust emission part of the car to capture the fine particles in the exhaust. The disadvantage of this approach is that the exhaust gas emission channel will gradually become blocked as the trapped particles accumulate. The way to remove these accumulated particles is to increase the temperature of the exhaust gases by injecting rated fuel oil in a certain direction of the channel or directly in the exhaust gas, and in the presence of a catalyst in the trap, the exhaust gases are high enough to burn and vaporize the accumulated particles. This cleaning process is known as the "regeneration" process. There is a problem with this process, the "regeneration" process is too frequent, which increases fuel consumption; If the distance is too long, the engine function will be reduced. Therefore, it is important to choose a reasonable "regeneration" trigger time.
The differential pressure sensor sends a differential pressure signal to the ECU, which determines the degree of accumulation of particles in the trap based on this differential pressure difference, and determines the "regeneration" trigger time and the rated fuel injection amount. At the same time, the ECU can also control the temperature of the exhaust gas by controlling the EGR valve.
In addition, differential pressure sensors can also be used to measure gas flow and liquid level concave and convex levels.
The method of measuring gas flow rate obtains the static pressure of the flow tube through the difference between the pressure of the flow tube and the atmospheric pressure, and the square root of the static pressure is proportional to the flow rate, so as to obtain the flow rate.
The liquid level concave and convex measurement method measures the pressure difference value of the concave and convex liquid surface, and then converts the liquid level height according to the liquid density.
There are some things that need to be paid attention to in the application of differential pressure sensors, such as:
The measured medium is not allowed to freeze, otherwise it will damage the sensor element isolation diaphragm and cause damage to the transmitter, and if necessary, the transmitter should be temperature protected to prevent freezing;
Do not use a voltage higher than 36V to the transmitter, resulting in damage to the transmitter; When measuring steam or other high-temperature medium, the temperature should not exceed the limit temperature of the transmitter, and it is necessary to use a heat dissipation device higher than the limit temperature of the transmitter;
When measuring steam or other high-temperature media, heat pipes should be used to connect the transmitter and the pipeline, and the pressure on the pipeline should be transmitted to the transformer;
When the measured medium is water vapor, an appropriate amount of water should be injected into the heat pipe to prevent the superheated steam from directly contacting the transmitter and damaging the sensor.
Do not touch the diaphragm with a hard object, resulting in damage to the diaphragm, etc.
|
More on that
|
Important things to do with your torque sensor – we are blessed
In the process of application, the sensor will inevitably be affected by the environment, temperature, dust and other factors, so that the equipment is aging or wearing, and if these problems are not dealt with in time, it will bury potential troubles for the future use of the equipment, resulting in large and small problems, and ...
|
|
Ultrasonic sensors are easy to install and assemble – we are blessed
Ultrasonic sensors are used for the inspection of printed circuit boards (PCBs), where ultrasonic sensors are used to inspect printed circuit boards. So what factors need to be considered when installing and installing ultrasonic sensors?
Ultrasonic sensors are capable of being installed and operated in any orientation, ...
|
|
Ultrasonic level gauge installation principle
1. The interval from the launch surface of the probe to the liquid level should be smaller than the range of the purchased surface.
2. The interval between the launch surface of the probe and the highest liquid level should be greater than the blind area of the purchased surface.
3. The launch surface of the probe should be parallel to the surface of the liquid.
...
|
|
Classification and Principle of Resistive Sensors – BEBF
The resistive sensor and the corresponding measuring circuit are composed of force, pressure, weighing, displacement, acceleration, torque and other measuring instruments for metallurgy, electric power, transportation, petrochemical, commercial, biomedical and national defense departments to carry out automatic weighing, process detection and realize the automation of the production process.
|
|
What are the types of displacement sensors – Doublebless
1. The displacement sensor is a device that converts the motion displacement of the object into measurable electrical quantities. It is usually used to convert physical quantities such as displacement, orientation, deformation, oscillation, and size that are not convenient for quantitative detection and processing into electrical quantities that are easy to quantitatively detect and facilitate information transmission and processing.
...
|
|
The R100 and R101 series of photoelectric sensors – we are blessed
With the launch of the new R100 and R101 series of photoelectric sensors, we have expanded our Sensing Skills 4.0 product line with innovative intelligence.
The R100 and R101 range include two light source plans: the robust PowerBea...
|
|
Material classification for displacement sensors – a blessing
(1) Conductive plastic displacement sensor
Conductive plastic displacement sensor uses a special process to coat the DAP (didipropylphthalate) resistance paste on the insulating body, heat and polymerize to form a resistive film, or press the DAP resistive powder thermoplastic into the groove of the insulating matrix to form a solid body as a resistor.
|
|
Instructions for setting up the ultrasonic function
Instructions for setting up the ultrasonic function: The LED shows the setup process. The green light flashes and the target is found; The target did not notice a red ED flash; The connection setting is tucked into place and the T is set. Once the setup process is complete, the sensor works normally.
...
|
|
The material of the LVDT displacement sensor
Generally speaking, stainless steel is the base material for most LVDT displacement sensors, as such raw materials have many advantages. Of course, there will be exceptions to the use of raw materials, for example, some products are not so demanding, in order to save costs, different raw materials may be used...
|
|
How to install the safety barrier
1. The safety barrier should be installed in a safe place, and the environmental conditions meet the requirements of "application conditions" in the "Safety Barrier Selection Sample".
2. The connecting wires of the intrinsically safe end (blue end) and non-intrinsically safe end circuits of the barrier safety barrier should be laid separately in the wiring slot.
|
|
Wiring of weighing strain gauge tension and compression sensors – we are in control
Wiring method of weighing strain tension and compression sensor:
Strain gauge tension and compression load cells can be wired in two different input and output wiring methods:
The first is the four-wire connection method.
The load cell of the four-wire connection method has no special requirements for the secondary instrument panel, and it is very convenient to use.
|
|
Humidity sensor selection considerations – a blessing
If a humidity sensor is used at different temperatures, the effect of temperature drift should also be taken into account in the indication value. As we all know, relative humidity is a function of temperature, and temperature has a significant impact on the relative humidity in a given space.
Humidity Sensors ...
|
|
Installation and equipping of ultrasonic sensors
Ultrasonic sensors are used for the inspection of printed circuit boards (PCBs):
In this application, ultrasonic sensors are used to inspect printed circuit boards. So what factors need to be considered when installing and installing ultrasonic sensors ...
|
|
Introduction of P+F photoelectric sensors
A photoelectric sensor is a device that converts optical signals into electrical signals. Its principle of operation is based on the photoelectric effect. The photoelectric effect refers to the phenomenon that when light hits some substances, the electrons of the matter absorb the energy of the photons, and 7 the corresponding electrical effect occurs. According to the different phenomena of the photoelectric effect, the light ...
|
|
The choice of accelerometers – Beggar
1. Analog output or digital output:
The first thing to pay attention to is the case of the analog and digital outputs, which is important because it is the interface between the system and the sensor. In general, the voltage of the analog output is proportional to the acceleration. For digital outputs, pulse-width modulated signals are typically used ...
|
|
A common type of sensor – a sensor
Resistive
A resistive sensor is a device that converts physical quantities such as displacement, deformation, force, acceleration, humidity, temperature, etc. into resistance values. There are mainly resistive strain gauge, piezoresistive, thermal resistance, thermal, gas-sensitive, moisture-sensitive and other resistive sensor materials.
|
|
Installation steps for angle sensors – we are blessed
1. Position with the sensor installation boss, and fix it on the metal plate with screws, nuts or pressing plates. When installing the sensor, it is strictly forbidden to turn and drill the shaft and shell to avoid the shaft or shell being subjected to external impact and pressure, and the axial and radial direction of the shaft is not allowed to be subjected to impact force and pressure ( ...
|
|
Encoder failure and selection matters - Bejiafu
An encoder is a device that compiles or converts signals or data into signals that can be communicated, transmitted, and stored. The encoder converts angular or linear displacement into an electrical signal.
Fault Symptom:
1. The encoder itself ...
|
|
Problems and analysis of P+F encoders in use
Analysis of the causes of the problems encountered by P+F in the use of encoders:
1. Grating pollution This will reduce the signal output amplitude, and the oil must be quietly wiped off with absorbent cotton dipped in anhydrous alcohol.
2. Encoder connection cable ...
|
|
Intake Pressure Sensor Problem Response – Blessing to the Blessing
The inlet pressure sensor is abbreviated as MAP. It connects the intake manifold with a vacuum tube, and induces the vacuum change in the intake manifold with the different speed loads of the engine, and then converts the change of internal resistance from the sensor into a voltage signal, which is used by the ECU computer to correct the fuel injection amount and ignition timing angle. Other words...
|
|
Contact
working hours
