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.

Stress Gauge

SF series Stress gaugeCE

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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Digital Static Strainmeter

Digital Static Strainmeter TC-31M

The TC-31M is a small and light weight strainmeter dedicated to measurement of full bridge method. It is suited to measurement of strain gauge type transducers in field use. In addition, unmanned long term measurement is possible using its data memory and sleep interval functions.

Digital Static Strainmeter TC-31M
Features
  • Handheld strainmeter having drip proof construction equivalent to IP-54
  • Measurement range is ±30000×10-6 strain with resolution of 1×10-6 strain
  • Equipped with data memory of 10000 data
  • Compatible with flash memory card of 32/64/128MB
  • Alkaline dry battery (LR6×4) drive
  • Sleep interval function provided

  • Specifications
    Type TC-31M
    Number of measurement point 1
    Measuring range

    ±15mV/V (±30000 x 10-6 strain)
    Measuring object Strain gauge type transducers (120 to 1000Ω in full bridge)
    Measuring speed 200ms
    Dimensions 102(W) x 55(H) x 223(D)mm
    (except projecting parts)
    Weight Approx. 800g
    Power supply 4 AA-size (LR6) alkaline batteries 
    or exclusive AC adaptor (option)

Crack Detection Gauge

FAC series Crack detection gauge

FAC series crack detection gauges are designed to measure the length and propagation speed of cracks occurring as a result of metal fatigue in machinery, ships, aircraft, and automobiles. A gauge is adhered beforehand where cracks have occurred or are predicted to occur. As a crack progresses, the grid lines separate one after another, and output value changes. Use together with the special adaptor CGA-120B.

Applicable specimen Metal, Concrete
Operational temperature(℃) -30 to +80℃
Temperature compensation range(℃) -
Applicable adhesive CN, RP-2
Backing Special plastics
Element Cu-Ni
Strain limit -
Fatigue life at room temperature -

  • CRACK LENGTH AND PROPAGATION MEASUREMENT
    img_fac_02
    Type Measuring
    range
    (mm)    		 Backing
    length
    (mm)    		 Backing
    width
    (mm)    		 Gauge
    resistance
    (Ω)     		 Grid
    interval
    (mm)    		 Number
    of grid 
    FAC-5 4.5 28 5 1 0.1 46
    FAC-20 20 43 25 1 0.5 41

    Each package contains 10 gauges.

    Type Number of channels Operational temperature Dimension Weight
    CGA-120B 1 -30 to +80℃
    (except condensation)    		 20(W) x 15(H) x 15(D)mm
    (except projections)    		 Approx.5ｇ

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Thunder proof for TML-NET

Thunder proof for TML-NET NNZ-2A

The NNZ-2A is used for protecting TML-NET network measurement system from induced lightning. When the cable of instrument or network-module receives induced lightning, failure may be caused in the network driver and/or network module by the lightning surge. The NNZ-2A is connected to the connection cable of the network, and works to flow the surge current to the earth when induced lightning occurs. In addition, during standby of measurement, it automatically shuts off the network line to protect the network driver and network modules from the lightning surge.

Thunder proof for TML-NET NNZ-2A
Features
  • Shuts off network line automatically during measurement standby status to avoid induced current
  • Power is supplied from network line
  • Monitors voltage of network line and current of network modules, and shuts off immediately if abnormal condition occurs

  • Specifications
    Type NNZ-2A
    Surge tolerance 100A (8/20µs impulse)
    Available number for one system NNZ-2A: up to 10
    Low-comsumption network module: up to 100
    Rated power supply voltage DC18 to 24V
    Standard used cable Dedicated 2-conductor shielded cable
    Total extended distance: up to 2 km (at DC24V power supply voltage)
    up to 1 km (at DC18V power supply voltage)
    Display function Drop of voltage in the network line 
    Over current of network module (Shuts off the network modules at over current)
    Environment -20 to +60°C 85%RH or less (no condensation)
    Dimensions 50(W) x 28(H) x 100(D)mm (except projecting parts)
    Weight Approx. 120g

System Block Diagram

img_nnz2a_03e

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One-side Strain Gauge

DD series One-side strain gauge

These gauges are intended for measuring the bending and tensile strains separately by simply bonding the gauges on one side of a plate or beam. It works on the assumption that the strain distribution in the section of the specimen is linear along the height of the section when the section is subjected to both tensile and bending stress.  The gauges are effectively used for the measurement of a box　construction in structures such as bridges or pressure vessels, where the reverse side of the measurement object is not accessible for strain gauge installation. Optional (-F) lead-free solder specifications are also available.

One-side Strain Gauge
Applicable specimen Metal
Operational temperature(℃) -10 to +70℃
Temperature compensation range(℃) -
Applicable adhesive CN, P-2
Backing Acrylic
Element Cu-Ni
Strain limit 0.15% (1500 x 10-6 strain)
Fatigue life at room temperature 1 x 105 (±1000 x 10-6 strain)

  • ONE-SIDE STRAIN GAUGE

    dd
    Type Gauge
    length
    (mm)    		 Gauge
    width
    (mm)    		 Backing
    length a
    (mm)    		 Backing
    width b
    (mm)    		 Backing
    thickness
    c (mm)    		 Resistance
    (Ω)    		 Thickness of
    applicable
    specimen (mm)
    DD-1-15 3 2.9 15 7 1 350 Approx. 5 or less
    DD-2-30 3 2.9 30 7 2 350 Approx. 5 to 10

     

    * Orders accepted for 5 units at a time

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