Liquid flow sensor classification works

Liquid flow sensors can be divided into corrosive liquid flow sensors and non-corrosive liquid flow sensors, which are only distinguished from the media side, and are the first consideration in application selection. After determining the nature of the liquid, it is divided according to the needs of our own use. The metering type liquid flow sensor or the analog signal output flow sensor. The metering type now generally has a pulse signal (Saishenger water flow sensor), imitating The quantity signal output is now more than the switch signal output (such as the reed switch type water flow switch), and can also be converted into current and voltage signals. The imitation quantity only provides an imitation (switch) quantity, which cannot be measured. More crude, there is no metering type of liquid flow sensor with high precision, and the simulated flow rate is also a consideration for the switch liquid flow sensor. According to the accuracy, there are water meter grades (B grade and A grade, generally within 2% to 3% of the error, it is necessary to have a certificate), beyond the current use of 5%-10% electronic When the switch signal is used, or water control water heating, such as electric water heater, water dispenser, coffee machine, gas water heater water flow sensor (Saishenger water flow sensor). A summary of the sentence: one from the medium to start, the second from the use of demand into the water, three from the accuracy of the hand, you can choose the liquid flow sensor you want.

Introduction to the measurement principle of liquid flow sensor

The liquid flow sensor and the flow converter can be used to measure the liquid in the closed pipe which is not corrosive to stainless steel and corundum and hard alloy, and has no impurities such as fibers and particles. It has the characteristics of simple structure, light weight, high precision, good reproducibility, sensitive response, convenient installation and maintenance, etc. It is widely used in petroleum, chemical, metallurgy, water supply, papermaking and other industries. It is an ideal liquid sensor for flow metering and energy saving.
Measuring principle of liquid flow sensor:
The fluid flows through the liquid sensor housing. Since the blade of the impeller has a certain angle with the flow direction, the momentum of the fluid causes the blade to have a rotational moment. After the friction torque and the fluid resistance are overcome, the blade rotates. After the torque balance, the rotational speed is stable under certain conditions. The rotational speed is proportional to the flow rate. Due to the magnetic permeability of the blade, in the magnetic field of the signal detector (composed of permanent magnet and coil), the rotating blade cuts the magnetic flux and periodically changes the magnetic flux of the coil, thereby making the coil both ends Inductive output pulse signal, liquid flow sensor This signal is amplified and shaped by the amplifier to form a continuous rectangular pulse wave with a certain amplitude, which can be transmitted to the display instrument to display the instantaneous flow or total amount of the fluid. Within a certain flow range, the pulse frequency f is proportional to the instantaneous flow rate Q of the fluid flowing through the liquid flow sensor. The flow equation is:

In the formula:
F——pulse frequency [Hz]
k——The meter factor of the liquid flow sensor [1/m3], given by the checklist. If in [1/L]
Q—— instantaneous flow of fluid (under working condition) [m3/h]
3600——Conversion factor Note: The liquid flow sensor is suitable for medium with viscosity less than 5×10-6m2/s at working temperature. For liquids with viscosity greater than 5×10-6m2/s, liquid calibration of liquid flow sensor is required. After use.

D-sub Connector Contacts

D-sub Connector Contacts
A D-sub connector is a form of connector commonly found in electronic and computer systems. It consists of a D shaped metal band and two or more parallel rows of either pin contacts (male) or socket contacts (female). D-sub connector contacts can vary in size, material, current rating, length and resistance.

The most common type of connector is the crimp contact. These are assembled by inserting a stripped wire end into the cavity at the rear of the contact. The cavity is then crushed using a crimp tool, gripping the contact to the wire.

What are D-sub connector contacts used for?
The D-sub connector contacts carry the signal from the source to the destination across the D–sub connection.

Types of D-sub connector contacts
Most D-sub connectors are supplied with contacts ready in place. Contacts can be replaced if damaged or if the application of the D-sub connector is to be changed from the original design specification.

High-current, high-voltage, or co-axial inserts require larger contacts. The material of the D-sub connector contact can be changed if the robustness or quality of the connection needs to be improved.

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