Frictional type Axial Strain Transducer

Frictional type Axial Strain Transducer FGAH-1B-R／FGAH-1B-H

This transducer measures axial strain of steering tie-rod of a car and consists of two types FGAH-1B-R and FGAH-1B-H for which a cross section of the rod is round shape or hexagon's. It is also suited to measure axial strain of a tension rod used in aseismic reinforcement structure or in steel frame structure. Since frictional strain gauges are used in this transducer, installation is completed and it gets ready for measurement by merely pinching the rod with the transducer, without detaching the rod. There is no need of technical skill and complicated works for attaching strain gauges on the rod.

Frictional type Axial Strain Transducer FGAH-1B-R／FGAH-1B-H
Features
  • Easily installed by just clamping-on without detaching the existing rod
  • Tensile force management of rod between sheet piles or in architectural structures is easily achieved
  • Transducer can be removed after use and used repeatedly
  • Applicable rod is round rod of diameter 10 to 25 mm or hexagonal rod of width across flats 13 to 25 mm
  • Small and light construction to allow installation in a restricted space

  • Specifications
    Type FGAH-1B-R FGAH-1B-H
    Applicable shaft Round shape
    φ10.0 to 25.0mm    		 Hexagon shape
    Width across flats
    13.0 to 25.0mm
    Capacity

    ±1000 x 10-6 strain
    Rated output

    Approx. 2600 x 10-6 strain
    Non-linearity 1%RO
    Allowable temperature range -30 to +60℃(no dew condensation)
    Frequency response Approx. 6.5kHz
    Input/output resistance 1000Ω±3%
    Sensor mode Full bridge
    Dimensions Approx. φ52 x 35mm
    Weight Approx. 55g(excluding spacers and cable)
    Protection rating Equivalent to IP51
    Recommended exciting voltage 2V
    Allowable exciting voltage 5V
    Input/output cable φ3.2mm 0.08mm² 4-core shielded vinyl cable 5m

     

    [Test conditions] Test piece

    　1. Diameter 10mm
    　2. Inner diameter 6.2mm
    　3. Material SNCM439
    　4. Elastic modulus 208,000N/mm2 (our in-house test result)
    　5. Poisson’s ratio 0.29 (our in-house test result)
    　6. Surface roughness Ra1.2
    　7. Hardness HRC38

    *This transducer may not be applicable depending on the material, surface roughness and/or surface treatment of the rod.

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Tie-rod Loadcell

Tie-rod Loadcell TCLT-NA

The TCLT-NA is a load cell designed to measure the tensile and compressive force applied to the tie-rod of a car.

タイロッド荷重計 TCLT-NA
Features
  • Easy installation using connection thread between tie-rod and tie-rod end
  • 3 kinds of thread prepared for installation on various tie-rods
  • 6 types are available depending on the combination of thread and capacity

  • Specifications
    Type Capacity Mounting screw Rated output Nonlinearity Allowable temperature range
    TCLT-2KNA-10 2kN M10 × 1.25 Approx.1500 × 10-6 
    strain    		 0.5%RO -10 to +60℃
    TCLT-5KNA-10 5kN Approx.2000 × 10-6 
    strain
    TCLT-5KNA-12 M12 × 1.25
    TCLT-10KNA-12 10kN
    TCLT-10KNA-14 M14 × 1.5 Approx.3000 × 10-6 strain
    TCLT-20KNA-14 20kN

Junction Box

Junction Box JB-2/JB-4

This junction box is used to connect two or four strain gauge type transducers and average the outputs of those transducers. The mean value is easily measured by a digital indicator or data logger. 
It can also be used as a branching box to divide the connection of switching boxes into two or four series.

Junction Box JB-2/JB-4

  • Specifications
    Type JB-2/JB-4
    Number of input points JB-2 : 2
    JB-4 : 4
    Dimensions 80(W) x 50(H) x 120(D)mm
    Weight Approx. 220g

Examples of use

Example of use as an input averaging junction box

img-jb-2-4-02

・Strain gauge type transducers to be connected must be of the same capacity, rated output and input/output resistance
・The input/output resistance viewed from the instrument is as follows.
   (Input/output resistance of one transducer) divided by (Number of connected transducers).
   The calculated value above must be within the range of the instrument specification.

Example of use as a branching box

img-jb-2-4-03

As the inside of the junction box is wired with 7 wires (for terminals A to G), the junction box can also be used as a branching box as the above. Each connection between the data logger, junction box and switching boxes must be made using an exclusive 7-core cable specified by us.

FBG Fiber-optic Strainmeter

FBG Fiber-optic Strainmeter TFM-104

This is an instrument to carry out strain measurement using FBG optical fiber sensors. It has four ports for connecting optical fibers. The use of wideband light source offers excellent anti-vibration tolerance and durability. It has functions of converting FBG sensor output into strain and also compensating the temperature dependence of the sensor. These functions enable highly accurate strain measurement when combined with our FBG sensors. In addition, by connecting the clock input and trigger input with our multi-recorders, synchronized measurement becomes possible with various sensors such as strain gauges, voltage signals and thermocouples. The LAN interface is provided for easy operation of this strainmeter by connecting a personal computer. (Discontinued)

FBG Fiber-optic Strainmeter TFM-104
Features
  • Remote measurement possible
  • Not influenced by electromagnetic noise
  • Long distance measurement possible
  • Less influenced by vibration and secular change owing to the use of durable optical parts
  • Synchronized with other instruments by clock/trigger synchronization
  • Two or more sensors can be measured simultaneously using one optical fiber port
  • Four optical fiber ports provided
  • Temperature compensation is possible when combined with our FBG sensors
  • Measured values can be monitored and recorded in strain or other physical quantities
  • WDM (wavelength division multiplexing) method is adopted to enable optical fiber branching
  • LAN interface provided
  • All cable connections are located on the front panel
  • After sales service is assured because this product is developed by ourselves

  • Specifications
    Type TFM-104 TFM-104(-01)
    Number of optical signal ports 4 1
    Applicable fiber Single mode fiber
    Optical connector FC/APC receptacle
    Measurement strain wavelength range 1525 to 1570nm *1
    Resolution 0.1pm
    Number of measuring points 16/port (at maximum)
    Sampling speed 1msec (when using 1 port)
    10msec (when using 4 port)
    Calculation Initial value calculation, Temperature compensation, Physical value conversion, Shift calculation
    Interface LAN
    Sampling clock input +5V-0V,Negative logic, Period 1 ms or more, Pulse width 0.4 ms or more
    Trigger input +5V-0V,Negative logic, Pulse width 1 sampling or more
    Power supply DC10 to 16V 2A MAX
    Operating environment -10 to +50°C, less than 85%RH (without condensation)
    External dimensions 320(H) x 60(H) x 220(D)mm (except projecting parts)
    Weight Approx. 2.5kg
    Supplied software TFM-7104 Strain, Temperature, Measurement wavelength, Initial wavelength, Strain time-series chart, Optical spectrum chart, etc.

    ※1: 1510 ～ 1590nmのモデルも対応可能 

System block diagram

img-tfm_system

Stress Gauge

SF series Stress gauge

These gauges are intended to measure the stress in an optional direction of the specimen in plane stress field. The gauges are sensitive not only in these axial direction but also in the transverse direction, and the sensitivity ratio of the transverse direction to the axial directions is equal to the Poisson’s ratio of the specimen material. In addition, the gauges are not sensitive to the shearing strain. Accordingly, the output of the gauges is proportional to the stress in the axial direction. The gauges are available in three types depending on the Poisson’s ratio of the specimen material. 

Applicable specimen Metal
Operational temperature(℃) -20 to +200℃
Temperature compensation range(℃) +10 to +100℃
Applicable adhesive NP-50B, CN, C-1
Backing Polyimide
Element Cu-Ni
Strain limit -
Fatigue life at room temperature 1 x 106 (±1500 x 10-6 strain)

  • AXIAL STRESS MEASUREMENT
    Gauge pattern Type Gauge
    length
    (mm)    		 Gauge
    width
    (mm)    		 Backing
    length
    (mm)    		 Backing
    width
    (mm)    		 Resistance
    (Ω)
    Poisson's
    ratio
    of specimen
    sfa_28511 SFA-285-11 4 3 9 6 120 0.285
    SFA-305-17 4 3 9 6 120 0.305
    SFA-330-23 4 3 9 6 120 0.330

    Each package contains 10 gauges.
    Lead wire attachment service is available on request.

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