Backed Semiconductor Bridge Gages

Half-Bridge (SSGH) and Full-Bridge (SSGF)

Introduction

Backed Semiconductor Strain Gages Half-Bridge (SSGH) & Full-Bridge (SSGF) Piezo-Metrics offers a wide range of semiconductor backed half and full bridge that can be bent around a one half inch radius without hurting the gage. Our Half-Bridge Backed Gages are constructed using two thermally matched gages bonded onto a backing which allows them to track each other. When used as one side of the bridge, they compensate each other thermally even when bonded since they both see the same thermal expansion and temperature. When both gages have a gage factor (GF) of 140 the transverse gage will normally see the Poisson’s effect, which for most steels is 0.3. This reduces the transverse gage factor to 42. The average GF for the half bridge would be 91. Our Full-Bridge Gages are constructed using four thermally matched gages bonded onto a backing.

Specifications

  • Bar gages ranges available 120 ohm up to 1000 ohms
  • Czochralski pulled boron doped silicon
  • Base material FR4 TG-250
  • Tinned Copper Solder Pads and Traces


    • Gages with Low resistance down to 10 ohm up to 10k ohms are also available, call (805) 522-4676 for details.

    Backed Temperature Compensated Semiconductor Strain Gages Half Bridge (SSGH)

    Part Number

    Width Lead

    Attachment

    Thickness

    Resistance
    Ohms @ 78° F

    Gage factor

    TCGF

    TCR
    SSGH-080-050-120PB
      .008
      WL
      .0004
      120±20
      120±20
      -9%
      5%
    SSGH-080-050-345PB
      .008
      WL
      .0004
      345±40
      140±10
      -13%
      16%
    SSGH-060-033-500PB
      .008
      WL
      .0004
      540±50
      140±10
      -13%
      15%
    SSGH-060-033-1000PB
      .008
      WL
      .0004
      1050±75
      155±10
      -18%
      24%
    SSGH-060-033-5000PB
      .008
      WL
      .0004
      5000±500
      175±10
      -23%
      47%
    SSGH-060-033-2000PB
      .016
      WL
      .0004
      2000±100
      155±10
      -18%
      25%
    SSGH-080-050-10000PB
      .016
      WL
      .0004
      10000±1000
      175±10
      -23%
      42%

    Standard Bridge Matching

    Temperature°F
    Standard Matching    		 0°
    ±0.6%    		 78°
    ±0.4%    		 278°
    ±0.4%
    Percent of Base Resistance

    Backed Bridge Gages

    X=Gage Length Y=Gage Active Length Z=Gage Width

    Part Number

    Width Lead

    Attachment

    Thickness

    Resistance
    Ohms @ 78° F

    Gage factor

    TCGF

    TCR
    SSGH-080-050-120PB
      .008
      WL
      .0004
      120±20
      120±20
      -9%
      5%
    SSGH-080-050-345PB
      .008
      WL
      .0004
      345±40
      140±10
      -13%
      16%
    SSGH-060-033-500PB
      .008
      WL
      .0004
      540±50
      140±10
      -13%
      15%
    SSGH-060-033-1000PB
      .008
      WL
      .0004
      1050±75
      155±10
      -18%
      24%
    SSGH-060-033-5000PB
      .008
      WL
      .0004
      5000±500
      175±10
      -23%
      47%
    SSGH-060-033-2000PB
      .016
      WL
      .0004
      2000±100
      155±10
      -18%
      25%
    SSGH-080-050-10000PB
      .016
      WL
      .0004
      10000±1000
      175±10
      -23%
      42%

    Ordering Guidelines and Examples

    A > B > C > D > E > F > G > H

    SS > 080 >0505 > 120 > PB > B > M2
    A. Model (SSGH) SSGH-080-050-120PB-B-M2 is a Backed Semiconductor Strain gage with a Total Length of 080 and an Active Length of 050. The gage has a nominal resistance of 120 at 78°F. The gage is further defined as P Dopant and is configured for Bending applications. M2 denotes two backings.
    Piezo-Metrics offers several matching options.
    • M1 is a single backing with two semiconductor gages that have been resistance matched to each other from 0 to 272 degrees F.
    • M2 is two backings with two semiconductor gages on each backing, all gages are resistance matched to each other from 0 to 272 degrees F.
    • M3 is three backings with two semiconductor gages on each backing, all gages are resistance matched to each other from 0 to 272 degrees F.
    • M4 is four backings with two semiconductor gages on each backing, all gages are resistance matched to each other from 0 to 272 degrees F.
    Note: For sets greater than M4 contact us for pricing and delivery.
    Note: Backings are packaged with resistance vs. temperature test data.
    B. Total Length
    C. Active Length
    D. Nominal Resistance at 78° F
    E. Dopant
    F. Style (L) Load (B) Bending (T) Torque T1 or T2
    G. Matched set (M1) (M2) etc.

    Semiconductor Strain Gages have large temperature coefficients of resistance making single gage strain measurements difficult unless used at a constant temperature. For this reason, gages are predominantly used in a half bridge or full bridge circuits and carefully matched for slope and intercept.

    Part Number Details

      SS-060-033-500P-S2
      SS designated Semiconductor Strain Gage.
      060 designated the gage is 0.060 long.
      033 designates the gage has an active area in the center of 0.033.
      500P designates 500 ohms nominally at room temperature and it is P-doped.
      S2 indicates these two gages are resistance versus temperature matched to each other.

    Standard Packaging

    Gages are packed in clear plastic boxes measuring approximately one inch square.
    Each clear box lid is labeled with information about the gage.


    • Temperature °F is noted along with the corresponding Resistance in Ω


    Ohms 0°F 477
    78°F 517
    278°F 674


    • Gage lot Number is marked as Lt.

    • Computer System number used to measure the resistance over temperature
    • Gage Position Number identifies the position of the gage on the board in the temperature chamber.


    Notes:

    The computer system also measures and records reverse current and TCR ( Thermal Coefficient of Resistance ). This data is used to detect nonperforming gages allowing them to be removed from production.


      Gages are package one gage to a clear box with each box having its own label. Matched sets will be joined together with clear plastic tape on the bottom of the boxes.

    Matched Gage Information

    There are many uses for semiconductor strain gages and to accommodate these applications, Piezo-Metrics offers a number of matching options. SS-060-033-500P-xx

    S1 is a single gage, tested and with data.

    S2 is a thermally matched set of two gages, tested with data. S4 is a thermally matched set of four gages, tested with data.

    We recommend a spare gage be purchased in the event that a gage is damaged during installation.

    An S3 or S5 at the end of the part number should be designated for this request.

    For double bridges requiring eight gages you would specify an S8 at the end of the gage number or S9 for a Spare.

    Standard Matching

    Standard Matching is at Three Temperatures and adhere to the following tolerances.

    0°F +/- 3 ohms
    78°F +/- 2 ohms
    278°F +/- 2 ohms

    Custom Matching

    In general, tighter matching permits better performance especially with respect to bridge temperature compensation. When gages are to be used below 0 F, additional testing is required.
    Piezo-Metrics does offer special matching upon request. (Examples Below)

    500 Ohms matched 1000 Ohms Matched
    0°F +/- 2 ohms -65°F +/- 6 ohms
    78°F +/- 1 ohm 0°F +/- 6 ohms
    278°F +/- ohm 78°F +/- 4 ohms
    278°F +/- 4 ohms

    Since the options for matching and temperature are numerous, please consult with our engineers who will advise if more accurate matching is required for your application. 1-800-638-3770

    .

    Gage Design

    "Bar Shaped Gage - Lead Wires exit the ends of each side of gage

    Schematic of a bar strain gage

    “U” Shaped Gage - Lead Wires Exit the same side of gage. These gages are also useful since the length is less and for the same length and resistivity, we can offer twice the resistance.

    “M” Shaped Gage - Lead Wires Exit the same side of gage.

    Gages are available between 10 ohms and 10,000 ohms.
    Special gages are available for up to 800°F operation.

    SSGH-060-033-500PB-B-M1 | BAR Semiconductor Gage | Single Backing | Two Gages | Bending Measurement

    Piezo-Metrics: SSGH-Bending (Gages)
    UNLESS OTHERWISE SPECIFIED
    Dimensions are in inches tolerances:
    Angular: mach ±0*30
    One place decimal ±0.03
    Two place decimal ±0.010
    Three place Decimal ± .005
    All dia .005 Tir. Radii .005 Max
    Surface finish    		 Drawn: 04/12/13
    PROPRIETARY AND CONFIDENTIAL The information contained in this drawing is the sole property of Piezo-Metrics. Reproduction in part or as a whole without the written permission of Piezo-Metrics is prohibited. Checked: 04/12/13
    Drawing of SSGH-060-033-5000PB-B-M1
    Piezo-Metrics: PCB, SSGH-Bending (Gages)
    UNLESS OTHERWISE SPECIFIED
    Dimensions are in inches tolerances:
    Angular: mach ±0*30
    One place decimal ±0.03
    Two place decimal ±0.010
    Three place Decimal ± .005
    All dia .005 Tir. Radii .005 Max
    Surface finish    		 Drawn: 04/01/13
    PROPRIETARY AND CONFIDENTIAL The information contained in this drawing is the sole property of Piezo-Metrics. Reproduction in part or as a whole without the written permission of Piezo-Metrics is prohibited. Checked: 04/01/13
    SSGH-060-033-500PB-L-M2 | BAR Semiconductor Gage | Two Backings | Four Gages | Load Measurement
    Piezo-Metrics: SSGH Load (Gages)
    UNLESS OTHERWISE SPECIFIED
    Dimensions are in inches tolerances:
    Angular: mach ±0*30
    One place decimal ±0.03
    Two place decimal ±0.010
    Three place Decimal ± .005
    All dia .005 Tir. Radii .005 Max
    Surface finish    		 Drawn: 04/12/13
    PROPRIETARY AND CONFIDENTIAL The information contained in this drawing is the sole property of Piezo-Metrics. Reproduction in part or as a whole without the written permission of Piezo-Metrics is prohibited. Checked: 04/12/13
    Piezo-Metrics: PCB SSGH-Load (Gages)
    UNLESS OTHERWISE SPECIFIED
    Dimensions are in inches tolerances:
    Angular: mach ±0*30
    One place decimal ±0.03
    Two place decimal ±0.010
    Three place Decimal ± .005
    All dia .005 Tir. Radii .005 Max
    Surface finish    		 Drawn: 03/29/13
    PROPRIETARY AND CONFIDENTIAL The information contained in this drawing is the sole property of Piezo-Metrics. Reproduction in part or as a whole without the written permission of Piezo-Metrics is prohibited. Checked: 03/29/13
    SSGH-060-033-500PB-L-M2 | BAR Semiconductor Gage | Two Backings | Four Gages | Load Measurement
    Piezo-Metrics: SSGH Bending (Gages),
    U-Gage (Gages)
    UNLESS OTHERWISE SPECIFIED
    Dimensions are in inches tolerances:
    Angular: mach ±0*30
    One place decimal ±0.03
    Two place decimal ±0.010
    Three place Decimal ± .005
    All dia .005 Tir. Radii .005 Max
    Surface finish    		 Drawn: 04/12/13
    PROPRIETARY AND CONFIDENTIAL The information contained in this drawing is the sole property of Piezo-Metrics. Reproduction in part or as a whole without the written permission of Piezo-Metrics is prohibited. Checked: 04/12/13
    Piezo-Metrics: PCB, SSGH-Bending U-Gage
    UNLESS OTHERWISE SPECIFIED
    Dimensions are in inches tolerances:
    Angular: mach ±0*30
    One place decimal ±0.03
    Two place decimal ±0.010
    Three place Decimal ± .005
    All dia .005 Tir. Radii .005 Max
    Surface finish    		 Drawn: 07/30/13
    PROPRIETARY AND CONFIDENTIAL The information contained in this drawing is the sole property of Piezo-Metrics. Reproduction in part or as a whole without the written permission of Piezo-Metrics is prohibited. Checked: 07/30/13
    SSGH-060-033-5000PB-B-M1 | BAR Semiconductor Gage | Single Backing | Two Gages | Bending Measurement
    Piezo-Metrics: SSGH Torque 1 (Gages)
    UNLESS OTHERWISE SPECIFIED
    Dimensions are in inches tolerances:
    Angular: mach ±0*30
    One place decimal ±0.03
    Two place decimal ±0.010
    Three place Decimal ± .005
    All dia .005 Tir. Radii .005 Max
    Surface finish    		 Checked: 04/12/13
    PROPRIETARY AND CONFIDENTIAL The information contained in this drawing is the sole property of Piezo-Metrics. Reproduction in part or as a whole without the written permission of Piezo-Metrics is prohibited. Checked: 04/12/13
    Piezo-Metrics: PCB, SSGH Torque 1
    UNLESS OTHERWISE SPECIFIED
    Dimensions are in inches tolerances:
    Angular: mach ±0*30
    One place decimal ±0.03
    Two place decimal ±0.010
    Three place Decimal ± .005
    All dia .005 Tir. Radii .005 Max
    Surface finish    		 Checked: 07/02/13
    PROPRIETARY AND CONFIDENTIAL The information contained in this drawing is the sole property of Piezo-Metrics. Reproduction in part or as a whole without the written permission of Piezo-Metrics is prohibited. Checked: 07/02/13
    SSGH-060-033-1000PB-B-M1 | BAR Semiconductor Gage | Single Backing | Two Gages | Torque Measurement
    Piezo-Metrics: SSGH Torque 2 (Gages)
    UNLESS OTHERWISE SPECIFIED

    Dimensions are in inches tolerances:
    Angular: mach ±0*30
    One place decimal ±0.03
    Two place decimal ±0.010
    Three place Decimal ± .005
    All dia .005 Tir. Radii .005 Max
    Surface finish    		 Checked: 04/12/13
    PROPRIETARY AND CONFIDENTIAL The information contained in this drawing is the sole property of Piezo-Metrics. Reproduction in part or as a whole without the written permission of Piezo-Metrics is prohibited. Checked: 04/12/13
    Piezo-Metrics: PCB, SSGH-Torque 2
    UNLESS OTHERWISE SPECIFIED
    Dimensions are in inches tolerances:
    Angular: mach ±0*30
    One place decimal ±0.03
    Two place decimal ±0.010
    Three place Decimal ± .005
    All dia .005 Tir. Radii .005 Max
    Surface finish    		 Checked: 04/03/13
    PROPRIETARY AND CONFIDENTIAL The information contained in this drawing is the sole property of Piezo-Metrics. Reproduction in part or as a whole without the written permission of Piezo-Metrics is prohibited. Checked: 04/03/13
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