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Precautions for installing S-type load cells

Views: 5     Author: Site Editor     Publish Time: 2023-09-04      Origin: Site

The principle of the load cell resistance strain gauge:

Ningbo Chenbang smart resistance strain gauge is an element used to measure strain. It converts changes in strain on mechanical components into changes in electrical resistance. The resistance strain gauge is made of constantan wire or nickel-chromium wire with Φ=0.02-0.05mm wound into a grid shape (or corroded into a grid shape with a very thin metal foil) sandwiched between two layers of insulating sheets (base). Use silver-plated copper wires to connect to the wire grid of the strain gauge as the lead wire of the resistance gauge.

There are many forms of resistance strain gauges, commonly used wire and foil. It is made of constantan wire or nickel-chromium wire with a diameter of 0.02~0.05mm wound into a grid shape (or etched into a grid shape with a very thin metal foil) sandwiched between two layers of insulating sheets (base), and is plated with tin The copper wire is connected with the strain gauge wire grid as the lead wire of the strain gauge, which is used to connect the measuring wire.

The measurement principle of Ningbo Chenbang intelligent resistance strain gauge is: in addition to the properties of the material, the resistance value of the metal wire is also related to the length and cross-sectional area of the metal wire. The metal wire is pasted on the component. When the component is deformed by force, the length and cross-sectional area of the metal wire also change with the component, and then the resistance changes.

dR/R=Ks*ε

Among them, Ks is the sensitivity coefficient of the material, and its physical meaning is the resistance change rate per unit strain, which indicates whether the resistance strain gauge effect of this type of wire material is significant or not. ε is the strain at the measuring point, which is a dimensionless quantity, but it is customary to give the unit micro-strain, which is usually represented by the symbol με.

It can be seen that when the metal wire produces a strain effect, the strain ε has a linear relationship with the resistance change rate dR/R. This is the theoretical basis for using metal strain gauges to measure component strain.

What are the main uses of load cells:

Ningbo Chenbang intelligent weighing sensor has the characteristics of simple installation and strong environmental adaptability, which can meet the weighing needs of various industries. The following is the main purpose of Ningbo Chenbang intelligent weighing sensor:

The use range of load cells is very wide, mainly used in various electronic scales, industrial control fields, online control, safety overload alarms, material testing machines and other fields. Such as electronic truck scales, electronic platform scales, electronic forklifts, dynamic axle load scales, electronic hook scales, electronic pricing scales, electronic steel scales, electronic track scales, hopper scales, batching scales, canning scales, etc.

Aluminum alloy cantilever beam weighing sensor is mainly suitable for electronic price calculation scales, platform scales, case scales, etc.;

Steel cantilever beam load cells are suitable for electronic belt scales, sorting scales, etc.; steel bridge sensors are suitable for rail scales, truck scales, etc.;

Column load cells are suitable for truck scales, dynamic track scales, large tonnage hopper scales, etc.

Installation method of S type load cell

① Pull vertically or horizontally through the two ends of the upper and lower threads at the same time to measure the tensile force.

②One section is fixed on the equipment through the threaded hole, and one end is used for pressing (just like the one used in the experimental press, the force in the pressing direction is directly measured).

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S-type load cell installation diagram

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S type load cell



S-type load cells are mainly used to measure the tension and pressure between solids. Because their appearance is similar to the "S" shape, they are often called S-type sensors, also called pull-type sensors or pressure-type sensors. S-type load cells are easy to install and are often used in electronic crane scales, batching scales, etc.

Precautions for installing S-type load cells:

1: First of all, the appropriate S-type load cell range and rated load must be selected according to the actual working environment. The S-type load cell itself has a certain overload capability, but overloading should be avoided during installation and use. Avoid irreparable damage to the sensor due to short-term overloading.

2: The S-type load cell should be handled with care, especially for the small-capacity S-type sensor that uses alloy aluminum material as the elastomer. Any impact or drop caused by vibration may cause a large output error.

3: Before installation, wiring must be carried out according to the requirements in the manual. Common wiring methods: red is the positive pole of the power supply, connected to EXC+, black wire is the negative pole of the power supply, connected to EXC-, green wire is the positive signal pole, connected to SIG+ on, the white wire is the negative electrode of the signal, connected to SIG-, the blue wire is the positive electrode of feedback, connected to SEN+, the yellow wire is the negative electrode of feedback, connected to SEN-, each load cell manufacturer may have different wire colors when the product leaves the factory. No, you need to follow the instructions for wiring.

4: The shell, protective cover and lead joints of the S-type sensor are all sealed. Do not disassemble them at will, because the sensor cable is adjusted according to the output resistance value when leaving the factory. Lengthening or shortening it by yourself will affect the sensor output resistance. In order not to affect the accuracy of the entire sensor, do not lengthen the cable by yourself. If it is really necessary to extend the length, solder the joints, add moisture-proof sealant, and add resistance again to adjust to the factory default output resistance.

5: The sensor cable should be kept away from strong power lines or environments with pulse waves, thereby reducing the output of on-site interference sources to sensor signals, reducing errors, and improving sensor accuracy.

6: In high-precision applications, the tension sensor and instrument should be used after preheating for 30 minutes.

7: When purchasing the sensor as a spare part, the load cell should be stored in a dry, ventilated and non-corrosive gas room.

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