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BF350 precision resistance strain gages for strain gauge pressure sensor 350 ohm load cells - Bulk Purchase Pricing

CC1212125429-bulk

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Seller Name : Mod N Shields
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Product Details

A strain gauge classification

Sensitive materials can be divided according to the gate metal, a semiconductor and a metal or metal oxide slurry and other categories:
1, the metal wire strain gauges include formula Wire-wound, short type Strain gauges, strain gauge and thin film strain gauge;
2, the semiconductor strain gauges include integrated semiconductor strain gauges, diffusion type semiconductor strain gauge and a thin film semiconductor strain gauge;
3, a metal or a metal oxide paste made mainly thick film strain gauge.

Our all metal foil strain gauge.

Second, the main parameters of the strain gauge

1, the resistance value of the strain gauge
The strain gauge resistance is the strain gauges at room temperature, and is not installed without the force of the resistance value measured.
Strain gauge resistance values of the selected primarily based on the measurement object and measuring instruments.

2, Strain gauge sensitivity factor
Gage factor of the strain gauge is: When the strain gauges attached to the uniaxial stress state in the specimen surface, and having a longitudinal (vertical line sensitive grid direction) parallel to the direction of stress, strain gauge resistance change with the surface of the specimen strain patch along the stress direction (ie, along the longitudinal strain gage) ratio, that is,Formula, K is a strain gauge sensitivity coefficient; the surface of the test piece measuring point with strain gauge sensitive to the vertical grid lines parallel to the direction of strain; RR relative change caused by strain gage resistance.

Strain gauge sensitivity coefficient depends mainly on the sensitivity coefficient sensitive grid material, but the two do not equal, for two main reasons: to wire strain gauges, for example, due to the presence of the cross bar, so after a gate made of sensitive sensitivity coefficient is less than the sensitivity coefficient of the wire, the difference between the size of the sensitive gate structure type and geometry related; deformation of the specimen surface is passed through the gate to the sensitive substrate and a binder, due to the impact of the end of the transition zone and the strained meter sensitivity coefficient is less than sensitive gate sensitivity coefficient, this difference is not only the number and the type of substrate and the adhesive and its thickness, but also on the extent of the affected curing adhesive and strain gauge installation . Thus, the gage factor of the strain gauge is influenced by many factors comprehensive index, it can not be obtained by theoretical calculations, but by the manufacturer for calibration tests by sampling on ized equipment determined. And indicate the average nominal value and the standard error on the packaging. Conventional strain gauge sensitivity coefficient from 2.0 to 2.4.

3, strain gauge strain limit
Strain limit strain gauge refers to the constant temperature conditions, the strain gauge is mounted specimen load progressively relative error indication strain and true strain tested structure Usually defined as 10% True strain value does not exceed a certain value of. In fact, the strain is a strain gauge at the limit does not exceed a predetermined non-linear error, the maximum value of the true strain can work.

Most sensitive grid material sensitivity factor in the elastic range is very small, so in general, decided to limit the size of the strain of the main factors are:
. A binder and base material transfer performance strain;
. B sensitive grid layout and wire solder;
c. Install strain gage.
Choose a higher shear strength of the adhesive and substrate materials, fabrication and installation of strain gage control substrate and the adhesive layer is not too thick, suitable curing treatment; all help to achieve high strain limit.
Working temperature, strain causes decreased significantly limit, medium and high temperature strain gauge under extreme operating temperature limits are below room temperature, strain gage.

4, the fatigue life of the strain gauge
The fatigue life of the strain gauge means: at constant amplitude alternating stress, strain gauge continuously, until a number of cycles of fatigue damage.

When one of the following three scenarios occur by strain gauges, fatigue damage can be considered: . A sensitive grid or wire break occurred;. B changes in strain gauge output amplitude 10%;. C spike spikes on the strain gage output waveform.
Fatigue damage is that, when measured in dynamic stress, strain gauge under an alternating strain effect, after several cycles, the sensitivity coefficient will increase with the number of cycles of strain and change. This is mainly due to the sensitive gate defects Pinholes and cracks on gridlines Contact resistance changes in the joints, the adhesive strength is reduced and poor strain gage installation caused by other factors. To improve the fatigue life of the strain gages, pay attention to the of solder connections and leads between the gate and sensitive.

Third, the strain gauge structure

Resistance strain gauge is mainly composed of sensitive grid, base, lead, covering layer, sensitive grid adhesively bonded between the substrate and the cover layer.

1, the gate sensitive grid alloy wire or foil made. It will strain the measured surface member is converted to the relative change in resistance. The most commonly used metal gate materials are sensitive to copper-nickel alloy, nickel-chromium alloys, nickel-molybdenum alloy, iron-based alloys, platinum-based alloys, palladium-based alloys, etc.

2, the base resistance strain gauges is an integral part. Its role is before the strain gauge is mounted on the specimen, the sensitive grid permanently or temporarily placed thereon, while also making insulated from each other between the gate and the sensitive strain gauge pasted specimen. Commonly used base material sheet, film (epoxy resin, phenol resin, polyester resin, and polyimide, etc.), glass fiber cloth, a metal sheet or the like.

3, the lead wire resistance strain gauge sensitive gate leads from filamentous metal wire or ribbon. Usually lead in the manufacture of and sensitive to strain gage grid connected and become part of the strain gauge.

4, seal resistance strain gauge is used to protect sensitive gate cap layer to avoid mechanical damage it or prevent high temperature oxidation. Commonly used is the production base of film or dip containing glue E.g., epoxy resin, phenol resin, etc. Glass fiber cloth as a cap layer to be applied when producers binder used as a protective layer on the sensitive gate. Cap materials include paper, film and glass fiber cloth. Fourth, metal resistance strain gauge application of principle

Resistance strain gage applications have two aspects: First, as the sensing element, is used directly for strain measurement test piece; the other is used as the conversion element constituting the sensor by the elastic element for any other element can be converted into elastic strain for indirect measurement of physical quantities. Strain gauge measurement with the paste on the surface of the object to be measured. When the object to be measured by the deformation, strain gauge sensitive grid also accompanied deformation, the resistance value changes accordingly, through the switching circuit is converted to a voltage or current changes in order to achieve strain measurement.

Resistance strain gauge metal working principle of resistance strain effect is that the wire when subjected to stress, its resistance with the mechanical deformation (tension or compression) of the size of the occurrence of corresponding changes. Theoretical formulas resistance strain effect is as follows:

R = * (L / S)

Where: resistivity (mm2 / m) L wire length (m) S wire cross-sectional area (mm2)

From the above equation, the process of the wire to withstand stress and mechanical deformation of the ,, L, S three have changed, which will inevitably lead to changes in wire resistance value. When done by external forces, increasing the length, cross-sectional area decreases, the resistance value; when under pressure to shorten the length of reduced cross-sectional area increases, the resistance value decreases. Therefore, as long as the measured change in resistance value it will be seen strain of the wire. This conversion relationship

R / R =Ko

Where: change in resistance value R wire;
Strain sensitivity coefficient Ko metallic material, which is mainly determined by the test method, and is substantially constant value within the elastic limit;
Axial strain of metal materials, namely,= L / L, It is also called the length of the strain on the wire, its duty between 0.24 to 0.4.

In practice, the metal resistance strain gauge attached to the surface of the sensor element or the elastic measured hungry mechanical parts. When the sensor elastic element or mechanical parts measured by force strained, pasted on which strain gauges also will occur the same mechanical deformation caused by the strain gauge resistance changes accordingly. In this case, the amount of mechanical strain gauges put the amount of change in resistance is converted to an output.

Sold by BF Series Specifications

Base: modified phenolic; wire grid: constantan (40% nickel, 1.5% manganese-copper alloy) ; Fully enclosed structure; enabling simultaneous temperature creep self - compensation and self-compensating.

High accuracy, good stability, ease of use, the sensor is suitable for 0.02.

Main Specifications

BF series

Typical resistance values

350

The average value of the resistance tolerance

0.1%

Sensitivity factor

2.00-2.20

Sensitive dispersion coefficient

1%

Strain limit

2.0%

Fatigue Life

1M

Since the temperature compensation coefficient

9,11,16,23,27

Operating temperature range

-30- + 80

BF350-3AA (23) N8

Product number long x width 3.2x3.1

Substrate Size long x width 7.4x4.4

Strain gauge models N * To creep label, the label is different, different creep values, its rule is:

+ N9N7N5N3N1N0N8N6N4N2T0T2T4T6T8T1T3T5 - The actual value difference between adjacent label creep 0.01-0.015% FS / 30min

Circuit Principle Referring to FIG. :

 

Typically sensor uses four equivalent resistors Wyeth Dayton and other bridge circuit. R, B As an input, G, W output end, RS protect circuit. By adjusting the RS, R1 adjust the zero balance circuit.

 

 

Strain gauge Specifications

The shop sold this type of physical strain gage as shown above, these strain gages Central Zemic manufacturing, belonging to BF series, the base material is a modified phenolic gate constantan wire as material, fully enclosed structure, the temperature can be achieved and creep automatic compensation, high accuracy, good stability, commonly used in grading 0.02 level sensor.

model: BF350-3AA ** N *

Grid wires: Long x width 3.2x3.1mm

Substrate Size: Length x width 7.4x4.4mm

Base material: modified phenolic substrates.

The gate wire material: copper foil Kang , Fully enclosed structure.

Resistance: 350 Ohm

Main Specifications

BF Series

Typical resistance values

350

The average value of the resistance tolerance

0.1%

Sensitivity factor

2.00-2.20

Sensitive dispersion coefficient

1%

Strain limit

2.0%

Fatigue Life

1M

Since the temperature compensation coefficient

9,11,16,23,27

Operating temperature range

-30- + 80

Use strain gauge

1 0.02 level is mainly applied to the pressure sensor fabrication process. 0.02 level mean full-scale output of the error in the range of plus or minus 0.02. High degree of precision. Specific sensor manufacturing process I will be described in detail later.

2 Direct measurement of strain member.

The strain gauge pasted directly in the deformation portion member when the member is deformed strain gauge resistance to change by resistance strain measurement device Strain gauges You can change the resistance strain gauges measured, in terms of the strain or the strain is proportional to the electrical signal Voltage and current Can.

3 Selection circuit (marked red is critical

Strain gauge resistance change is very small, there must be appropriate circuitry to detect the small changes, we usually choose a circuit which changes the resistance of the strain gauge circuit can control play a role, so that the circuit can be output with a similar change in resistance electric signal Voltage or current Then this signal can be dealt with appropriately Enlargement process .



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