Ordering number 

Nominal (rated) resistance

Dimensions [mm/inch]

Vmax 

Solder terminals

Preferred types

Measuring grid

Carrier

Ω

a1

a2

b

c

d

 

1-RY1x-3/120

120

0.8
0.031

3
0.118

0.8
0.031
7
0.276
7
0.276
1.5 LS7 1
1-RY1x-6/120

120

2
0.079

6
0.236

1.4
0.055
11
0.433
11
0.433
3 LS5 1,3

1-RY1x-10/120

120

2.9
0.114

10
0.394

2.7
0.106
15.4
0.606
15.4
0.606
5 LS4 1
 

Ordering number

Nominal (rated) resistance

Dimensions [mm/inch]

Vmax 

Solder terminals

Preferred types

Measuring grid

Carrier

Ω

a1

a2

b

d

1-RY3x-3/120

120

0.8
0.031

3
0.118

0.8
0.031

6.9
0.272

1.5

LS7

1

1-RY3x-6/120

120

2
0.079

6
0.236

1.4
0.055

11
0.433

3

LS5

1,3

1-RY3x-10/120

120

2.9
0.114

10
0.394

2.7
0.106

15.4
0.606

5

LS4

1

 

Ordering number

Nominal (rated) resistance

Dimensions [mm/inch]

Vmax

Solder terminals

 

 

Preferred types

Measuring grid

Carrier

Ω

a1

a2

b

c

d

1-RY4x-3/120

120

0.8
0.031

3
0.118

0.8
0.031
7
0.276
7
0.276
1.5 LS7 -

1-RY4x-6/120

120

2
0.079

6
0.236

1.4
0.055
11
0.433
11
0.433
3 LS5 1

1-RY4x-10/120

120

2.9
0.114

10
0.394

2.7
0.106
15.4
0.606
15.4
0.606
5 LS4 1
 

Ordering number

Nominal (rated) resistance

Dimensions [mm/inch]

Vmax

Solder terminals

Preferred types

Measuring grid

Carrier

Ω

a1

a2

b

d

1-RY7x-3/120

120

0.8
0.031

3
0.118

0.8
0.031
6.9
0.272
1.5 LS7 -

1-RY7x-6/120

120

2
0.078

6
0.236

1.4
0.055
11
0.433
3 LS5 -

1-RY7x-10/120

120

2.9
0.114

10
0.394

2.7
0.106

15.5
0.606

5

LS4

-

 

Ordering number

Nominal (rated) resistance

Dimensions [mm/inch]

Vmax

Solder terminals

 

 

Preferred types

Measuring grid

Carrier

Ω

a

b

c

d

1-RY8x-0.6/120

120

0,6
0.024

1.2
0.047
4.8
0.189
8.7
0.343
1.6 LS7 -

1-RY8x-1.5/120  

120

1,5
0.059

1.4
0.055
8.2
0.323
14.6
0.575
2.5 LS7 1

1-RY8x-3/120

120

3
0.118

1.1
0.043
9.7
0.382
14.6
0.575
3 LS7 1,3

1-RY8x-6/120

120

6
0.236

3
0.118
13
0.512
22.9
0.902
7.5 LS7 1

1-RY8x-1.5/350

350

1,5
0.059

1.6
0.063
8.2
0.323
14.6
0.575
5 LS7 -

1-RY8x-3/350

350

3
0.118

1.2
0.047
9.7
0.382
14.6
0.575
5.5 LS7 -

1-RY8x-6/350

350

6
0.236

2.8
0.11
13.1
0.516
22.9
0.902
13 LS5 1
 

Ordering number

Nominal (rated) resistance

Dimensions [mm/inch]

Vmax

Solder terminals

 

 

Preferred types

Measuring grid

Carrier

Ω

a

b

c

d

1-RY9x-1.5/120

120

1.5
0.059

1.3
0.051
9
0.354
8
0.315
1.5 LS7 1

1-RY9x-3/120

120

3
0.118

1.3
0.051
9
0.354
9
0.354
2 LS7 1,3

1-RY9x-6/120   

120

6
0.236

2.6
0.102
12.5
0.492
11.4
0.449
4.5 LS7 1,3

1-RY9x-10/120

120

10
0.394

4
0.157
17.5
0.689
16
0.63
7 LS7 1

1-RY9x-1.5/350

350

1.5
0.059

1.5
0.059
8
0.315
9
0.354
2.5 LS7 1

1-RY9x-3/350

350

3
0.118

1.5
0.059
9
0.354
9
0.354
3.5 LS7

1,3

1-RY9x-6/350

350

6
0.236

2.6
0.102
12.5
0.492
11.4
0.449
6 LS7 1,3

1-RY9x-10/350

350

10
0.394

4
0.157

17.5
0.693

16
0.63

11.5

LS7

-

 

Ordering number

Nominal (rated) resistance

Dimensions [mm/inch]

Vmax

Solder terminals

 

 

Preferred types

Measuring grid

Carrier

Ω

a

b

c

d

1-RY10x-1.5/120

120

1.5
0.059

1.4
0.055
8.2
0.323
13.5
0.531
2.5 LS7 1

1-RY10x-3/120   

120

3
0.118

1.1
0.043
9.7
0.382
13.5
0.531
3 LS7 3

1-RY10x-6/120  

120

6
0.236

3
0.118
16.4
0.646
22.9
0.902
7.5 LS4 -
1-RY10x-1.5/350

350

1.5
0.059

1.4
0.055
8.2
0.3232
13.5
0.531
5 LS7 1,3

1-RY10x-3/350

350

3
0.118

1.2
0.047
9.7
0.382
13.5
0.531
5.5 LS7 1,3

1-RY10x-6/350

350

6
0.236

2.8
0.11
16.4
0.646
22.9
0.902
12 LS4 1,3,6

The following temperature matching codes (1 … 9) apply to all types

1 = Ferritic steel (10.8 ppm/K; 6.0 ppm/°F)
3 = Aluminum (23 ppm/K; 12.8 ppm/°F)
5 = Austenitic steel (16 ppm/K, 8.9 ppm/°F)
6 = Silica/composite (0,5 ppm/K; 0.3 ppm/°F)
7 = Titanium and gray cast iron (9 ppm/K; 5.0 ppm/°F)
8 = Plastic (65 ppm/K; 36.1 ppm/°F)
9 = Molybdenum (5.4 ppm/K; 3.0 ppm/°F)

Remarks on Y Series

1) Strain gages are available in various temperature matches.
Insert the code in place of the placeholder “” to get the ordering number of the strain gage you need

2) Only available in matches for aluminum, ferritic and austenitic steel

3) Maximum permissible effective supply voltage (specified for steel)

4) Preferred types (available from stock) with the temperature matches specified in the column

5) With application aid (cut-to-size polyimide adhesive strip for easy positioning)

 

 

RY Strain Gauge Rosettes with 3 Measuring Grids for Analyzing Biaxial Stress States with Unknown Principal Strain Directions

These strain gauges (SGs) are an appropriate choice for analyzing the biaxial stress state with unknown principal strain directions. Rosettes type RY have 3 measuring grids arranged at an angle of 0°/45°/90° (types RY1, RY3, RY8, RY9, RY10), or 0°/60°/120° (types RY4, RY7).

HBM offers you a wide selection of SG rosettes with 3 measuring grids, with different geometries, dimensions, nominal (rated) resistances (120 and 350 ohms) and in temperature responses adapted for steel, aluminum or to customer specification.

The three measuring grids are arranged in a quarter bridge circuit.

Rosette (3 grids)

RY1

quadratic strain gauge with leads (0°/45°/90°)

RY8

Rectangular strain gauge with solder tabs (0°/45°/90°)

RY3

Round strain gauge with solder tabs (0°/45°/90°)

RY9

Stacked grids with leads (0°/45°/90°)

RY4

Quadratic strain gauge with leads (0°/60°/120°)

RY10

Rectangular strain gauge with solder pads and integrated strain relief (0°/45°/90°)

RY7

Round strain gauge with solder tabs (0°/60°/120°)

Notes on Calculating the First and Second Principal Stress

The 3 measuring grids of the rosettes are designated with the letters a, b and c. Accordingly the 3 strains εa, εb, and εc are measured with a 3 measuring grid rosette. The principal normal stresses σ1 and σ2 are calculated for the 0°/45°/90° rosette using the formula:

and for the 0°/60°/120° rosette:

The principal directions are determined below. First the tangent of an auxiliary angle ψ is calculated. For the 0°/45°/90° rosette using the formula:

and for the 0°/60°/120° rosette according to the formula:

Note: The tangent of an angle in the right-angled triangle is the ratio of the opposite side (numerator N) to the adjacent side (denominator D):

This ambiguity of the tangent makes it necessary to determine the signs of the numerator (N) and the denominator (D) before carrying out the final calculation of the two above mentioned quotients. It is important to determine the sign because that is the only way to know which quadrant of the circle the angle ψ will be found in. First determine the value of the intermediate angle ψ from the value of the tan:

Then determine the angle ϕ using the following approach:

Apply the angle ϕ that is found in this manner starting from the axis of the reference measuring grid a in a mathematically positive direction (counterclockwise). The axis of the measuring grid a forms one arm of the angle ϕ. The other arm represents the first principal direction. This is the direction of the principal normal stress σ1 (identical with the principal strain direction ε1). The point of the angle is located at the intersection of the measuring grid axes. The second principal direction (the direction of principal normal stress σ2) has the angle ϕ+90°.

The measuring grid consists of constantan; the material of the measuring grid carrier is polyimide.

RY6/RY8 strain gauges also come with a connection cable! One practical solution with many advantages: No soldering required at the measuring point, available in cable lengths from 0.5 m to 10 m, with RJ11 plug on request. A fluoropolymer-insulated wire on the strain gauge prevents the cable from sticking during installation. A practical solution for you...!

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