Page 89 - Demo

Strain Gauges
TML strain gauge series are roughly classified into 4 types depending on the method of installation.
1. Adhesive bonding type
In general, most of strain gauges are installed on the surface of test specimen with adhesive. Measurement is possible as far as the specimen material is bondable with adhesive. This method can be applied to various materials including metal, concrete, wood and composite material. After installation, coatings should be applied to protect the strain gauges and leadwires from various environmental conditions. The availability of this bonding type depends on the operating temperature of adhesive. The maximum operating temperature is 300°C.
3. Frictional gauge type (Re-usable type)
This gauge consists of a soft rubber layer on its contact surface and a magnet which presses the strain gauge against the specimen surface by magnetic force. It measures strain by friction which is caused between the contact surface of strain gauge and the measurement surface of the metal specimen. It has the advantage of being usable repeatedly because it is attached by magnetic force without using adhesive. Since the measurement point can be moved easily, it is useful for preparatory or supplemental measurement. The maximum operating temperature is 60°C because of adopting magnetic force.
Epoxy resin or VM tape
Leadwire
Frictional force
pressing
Frictional gauge
Leadwire SB tape bed
Connecting terminals
Strain gauge Fixing leadwire
Bonding adhesive
Strain CheckerFGMH Series
Torque Sensor System FGDH Series
Strain generated
Axial Strain Transducer FGAH Series
Metal specimen
Strain gauge
VM tape SB tape
Leadwire
Concrete specimen
SB tape (white) and VM tape (black) applied on concrete specimen
PS adhesive pre-coating layer for long time use
2. Electrical Spot weldable type
The strain gauge of this type is fully encapsulated in a corrosion-resisting metal tube for use in various conditions, such as gas-filled and underwater environments. It is constructed heat resistive, and the installation is made by electrical spot welding which maintains excellent fixation even in high temperature. The operating temperature range is from -196°C to +800°C. Naturally, the specimen material must be a metal which allows electrical spot welding.
4. Internal strain measurement using embedment type
This strain gauge measures internal strain of concrete, mortar or asphalt by being embedded into the material before its hardening. It makes possible with measurement in the early stage of hardening of the material. Some series of this type are applicable to measurement in asphalt in high temperature of 200°C. We also have a method to measure axial force of bolt by embedding a bolt strain gauge which is specially prepared for this purpose.
Strain Gauge AW series Spot welded
Metal specimen
Leadwire Leadwire fixed
Mold strain gauges PM and PMF series for use in concrete and mortar
Strain Transducers KM for use in concrete and KM-HAS for use in asphalt pavement
Rust-proofing layer
Weldable strain gauges eletrically spot welded on round structure.
marking availability of TML Strain Gauges
1.For strain gauges without integral lead wire, the followings are CE marked.
* F series GOBLET, PF/P/UBF/BF/DSF/CF/CEF/QF/ZF/EF/SF/AW/FAC/BTM series
Bolt gauge BTM series installed into bolt with bonding adhesive
* Some stain gauges other than the above are optionally available with CE marking. 2.For strain gauges without integral lead wire, CE marked strain gauges having integral lead
wire with " -F " added after the type name of the lead wire are CE marked.
Note) Please contact TML or your local representative for the details of CE marking availability.
87