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Taidacent BF120-3AA 120 Ohm Strain Gauge Weighing 0.02 Level Analog Sensor Load Cell Sensitivity Strain Gauge Force Sensor
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Meorient Import & Export Co.LTD
China - Hangzhou
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Hangzhou,Shanghai
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5-10人
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Product Specifications
--Product Description
Taidacent BF120-3AA 120 Ohm Strain Gauge Weighing 0.02 Level Analog Sensor Load Cell Sensitivity Strain Gauge Force Sensor
Product Description
High precision, good stability, easy to use, suitable for 0.02 level sensor
Strain gauges only provide descriptions or information, no technical advice, please be careful with beginners!
BF series specifications for sale:
Substrate: modified phenolic; grid wire: Constantan (copper alloy containing 40% nickel, 1.5% manganese); fully enclosed
structure; temperature self-compensation and creep self-compensation can be realized at the same time.
In the strain gauge model, N* is the creep label, the label is different, and the creep value is different. The rule is:
(+)N9>N7>N5>N3>N1>N0>N8>N6>N4>N2>T0>T2> T4>T6>T8>T1>T3>T5(-) The actual creep value between adjacent labels is 0.01-0.015%FS/30min
structure; temperature self-compensation and creep self-compensation can be realized at the same time.
In the strain gauge model, N* is the creep label, the label is different, and the creep value is different. The rule is:
(+)N9>N7>N5>N3>N1>N0>N8>N6>N4>N2>T0>T2> T4>T6>T8>T1>T3>T5(-) The actual creep value between adjacent labels is 0.01-0.015%FS/30min
First, the classification of strain gauges
According to the sensitive grid material, it can be divided into three categories: metal, semiconductor and metal or metal oxide paste:
1. Metal strain gauges include wire (wire wound, short-circuit) strain gauges, foil strain gauges and film strain gauges;
2. Semiconductor strain gauges include bulk semiconductor strain gauges, diffusion semiconductor strain gauges, and thin film semiconductor strain gauges;
3. Metal or metal oxide pastes are mainly made of thick film strain gauges.
This is foil metal strain gauges.
1. Metal strain gauges include wire (wire wound, short-circuit) strain gauges, foil strain gauges and film strain gauges;
2. Semiconductor strain gauges include bulk semiconductor strain gauges, diffusion semiconductor strain gauges, and thin film semiconductor strain gauges;
3. Metal or metal oxide pastes are mainly made of thick film strain gauges.
This is foil metal strain gauges.
Second, the main parameters of the strain gauge
1. Resistance value of strain gauge
The resistance of the strain gauge refers to the resistance value measured by the strain gauge at room temperature without being installed and without force.
The selection of the resistance of the strain gauge is mainly based on the requirements of the measuring object and the measuring instrument.
2. Sensitivity coefficient of strain gauge
The sensitivity coefficient of the strain gauge refers to the resistance change rate of the strain gauge and the surface of the test piece when the strain gauge is attached to the surface of the test piece in a uniaxial stress state and its longitudinal direction (the longitudinal direction of the sensitive gate is parallel) to the stress direction. The ratio of the strain at the patch along the stress direction (ie, the strain along the longitudinal direction of the strain gauge), where K is the sensitivity coefficient of the strain gauge; ε is the surface of the test piece parallel to the longitudinal direction of the strain gauge sensitive grid Strain; RRΔ is the relative change of the gauge resistance caused by ε. The commonly used strain gauge sensitivity coefficient is 2.0~2.4.
3. Fatigue life of strain gauges:
The fatigue life of a strain gauge is the number of cycles in which the strain gauge operates continuously under the constant amplitude of the alternating stress until the fatigue damage occurs.
The resistance of the strain gauge refers to the resistance value measured by the strain gauge at room temperature without being installed and without force.
The selection of the resistance of the strain gauge is mainly based on the requirements of the measuring object and the measuring instrument.
2. Sensitivity coefficient of strain gauge
The sensitivity coefficient of the strain gauge refers to the resistance change rate of the strain gauge and the surface of the test piece when the strain gauge is attached to the surface of the test piece in a uniaxial stress state and its longitudinal direction (the longitudinal direction of the sensitive gate is parallel) to the stress direction. The ratio of the strain at the patch along the stress direction (ie, the strain along the longitudinal direction of the strain gauge), where K is the sensitivity coefficient of the strain gauge; ε is the surface of the test piece parallel to the longitudinal direction of the strain gauge sensitive grid Strain; RRΔ is the relative change of the gauge resistance caused by ε. The commonly used strain gauge sensitivity coefficient is 2.0~2.4.
3. Fatigue life of strain gauges:
The fatigue life of a strain gauge is the number of cycles in which the strain gauge operates continuously under the constant amplitude of the alternating stress until the fatigue damage occurs.
Third, metal resistance strain gauge application and working principle
Resistance strain gauges have two applications: one is as a sensitive component, which is directly used for strain measurement of the tested component; the other is used as a conversion component, and the sensor is constructed by an elastic component for any other strain that can be converted into elastic component strain. Physical quantities are measured indirectly. When measuring with a strain gauge, attach it to the surface of the object to be measured. When the object to be measured is deformed by force, the sensitive grid of the strain gauge is also deformed, and the resistance value changes correspondingly, and is converted into a voltage or current change by the conversion circuit, thereby realizing the strain measurement.
The working principle of the metal resistance strain gauge is the resistance strain effect, that is, when the wire is subjected to stress, its resistance changes correspondingly with the magnitude of mechanical deformation (stretching or compression). The theoretical formula of the resistance strain effect is as follows:
R=ρ*(L/S) where: ρ—resistivity (Ω·mm2/m) L—length of wire (m) S—cross-sectional area of wire (mm2)
It can be seen from the above formula that in the process of mechanical deformation of the wire subjected to stress, ρ, L, and Sare all changed, which inevitably causes a change in the resistance value of the wire. When stretched by external force, the length increases, the cross-sectional area decreases, and the resistance value increases; when the pressure is shortened, the length decreases, the cross-sectional area increases, and the resistance value decreases. Therefore, as long as the change in the resistance value can be measured, the strain of the wire can be known. This conversion relationship is:
ΔR/R=Koε where: R—the amount of change in the resistance value of the wire;
Ko—the strain sensitivity coefficient of the metal material, which is mainly determined by the test method and is basically a constant value within the elastic limit;
ε—The axial strain value of the metal material, ie ε=ΔL/L, is also called ε is the length strain value, and for the wire, the
value is between 0.24 and 0.4.
In practical applications, a metal strain gauge is attached to the surface of the sensor elastic component or the Hungry
component to be tested. When the elastic element or the mechanical part to be tested is strained by the force, the strain gauge attached thereto also undergoes the same mechanical deformation, causing a corresponding change in the resistance of the strain gauge. At this time, the resistance strain gauge converts the mechanical quantity into a change amount of the resistance output.
Circuit principle:
Usually the sensor uses four equal-value resistors to form a bridge circuit such as Wyeth. R, B are the input terminals, G and Ware the output terminals, and RS acts as a protection circuit. Adjust the zero balance of the circuit by adjusting RS and R1
Patch points
(1) Mainly applicable to the pressure sensor manufacturing process of 0.02 grade. The 0.02 level means that the output error is in the range of plus or minus 0.02 at full scale. High precision. The specific sensor manufacturing process will be described in detail later.
(2) Directly measure the strain of the member.
The strain gauge is directly attached to the deformation portion of the member. When the member is deformed, the resistance value of the strain gauge changes. The resistance strain measurement device (strain gauge) can measure the resistance change of the strain gauge and convert it into strain or proportional to the strain. The electrical signal (voltage, current) can be.
(3) Circuit selection (very critical)
The resistance change of the strain gauge is very small, and there must be a proper circuit to detect the slight change. We
usually choose a circuit in which the change of the strain gauge resistance can control the circuit, so that the output of the
circuit can be similar to the resistance change. An electrical signal (voltage or current) can then be properly processed
(amplified).
The working principle of the metal resistance strain gauge is the resistance strain effect, that is, when the wire is subjected to stress, its resistance changes correspondingly with the magnitude of mechanical deformation (stretching or compression). The theoretical formula of the resistance strain effect is as follows:
R=ρ*(L/S) where: ρ—resistivity (Ω·mm2/m) L—length of wire (m) S—cross-sectional area of wire (mm2)
It can be seen from the above formula that in the process of mechanical deformation of the wire subjected to stress, ρ, L, and Sare all changed, which inevitably causes a change in the resistance value of the wire. When stretched by external force, the length increases, the cross-sectional area decreases, and the resistance value increases; when the pressure is shortened, the length decreases, the cross-sectional area increases, and the resistance value decreases. Therefore, as long as the change in the resistance value can be measured, the strain of the wire can be known. This conversion relationship is:
ΔR/R=Koε where: R—the amount of change in the resistance value of the wire;
Ko—the strain sensitivity coefficient of the metal material, which is mainly determined by the test method and is basically a constant value within the elastic limit;
ε—The axial strain value of the metal material, ie ε=ΔL/L, is also called ε is the length strain value, and for the wire, the
value is between 0.24 and 0.4.
In practical applications, a metal strain gauge is attached to the surface of the sensor elastic component or the Hungry
component to be tested. When the elastic element or the mechanical part to be tested is strained by the force, the strain gauge attached thereto also undergoes the same mechanical deformation, causing a corresponding change in the resistance of the strain gauge. At this time, the resistance strain gauge converts the mechanical quantity into a change amount of the resistance output.
Circuit principle:
Usually the sensor uses four equal-value resistors to form a bridge circuit such as Wyeth. R, B are the input terminals, G and Ware the output terminals, and RS acts as a protection circuit. Adjust the zero balance of the circuit by adjusting RS and R1
Patch points
(1) Mainly applicable to the pressure sensor manufacturing process of 0.02 grade. The 0.02 level means that the output error is in the range of plus or minus 0.02 at full scale. High precision. The specific sensor manufacturing process will be described in detail later.
(2) Directly measure the strain of the member.
The strain gauge is directly attached to the deformation portion of the member. When the member is deformed, the resistance value of the strain gauge changes. The resistance strain measurement device (strain gauge) can measure the resistance change of the strain gauge and convert it into strain or proportional to the strain. The electrical signal (voltage, current) can be.
(3) Circuit selection (very critical)
The resistance change of the strain gauge is very small, and there must be a proper circuit to detect the slight change. We
usually choose a circuit in which the change of the strain gauge resistance can control the circuit, so that the output of the
circuit can be similar to the resistance change. An electrical signal (voltage or current) can then be properly processed
(amplified).
Product Paramenters
Resistance | 120 ohms |
Base size | 6.6*3.4mm |
Wire grid size | 3.0*2.44mm |
Lead specification | 3-5 cm long enameled wire |
Resistance to nominal tolerance | 120 ± 3 Ω |
Resistance to average tolerance | ≤0.5Ω |
Applicable temperature | normal temperature (-30 ° C -60 ° C) |
Sensitivity coefficient and dispersion | 2.1±1% |
Room temperature strain limit | 20000 um/m |
Mechanical hysteresis | 1.2 um/m |
Room temperature insulation resistance | 10000MΩ |
Substrate material | modified phenolic substrate. |
Wire material | made of constant copper foil, fully enclosed structure. |
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