TENSMEG: Tension Measuring Gauge for 7-Wire Strands

The TENSMEG (tension measuring gauge) for monitoring strains in 7-wire strands, is an elongated spiral strain gauge comprised of a Teflon® coated resistive wire, extending between two hard, rubber end anchors.

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Overview

The TENSMEG (tension measuring gauge) for monitoring strains in 7-wire strands, is an elongated spiral strain gauge comprised of a Teflon® coated resistive wire, extending between two hard, rubber end anchors. The TENSMEG is an accurate and cost-effective means to examine load and strain in rock and soil anchors, and also in cable bolts used for rock support. Pre-stressed and post-tensioned concrete load and strain may also be effectively measured.

Due to its construction, the resistance wire is precisely inserted into the spiral grooves of the 7-wire strand used for anchors and therefore is well protected. The gauge has an excellent linear response, accuracy, and long term stability with water resistance capability. Specifications are unaffected when the TENSMEG is surrounded by cement grout or embedded in concrete structures.

The QB120 Resistance Strain Gauge Readout, reads, displays, and logs 1/4 bridge strain gauges. It is also the intended readout for the TENSMEG.


TENSION MEASURING GAUGE SPECIFICATIONS

ITEM SPECIFICATION
Full Scale Tension Exceeds 50,000 με
Full Scale Compression 3000 μ, dependent on level of pre-tension applied during installation
Resolution 1 με
Accuracy 2% F.S.
Length 48 cm (18.9 in) – other lengths available upon request
Gauge Factor 2.0 nominal
Gauge Resistance 120 Ohm
Excitation Voltage 1 V – 10 V DC
Initial Creep Less than 30 με, 48 hrs. after installation
Total Creep Less than 100 με, 3 months after installation
Yield Limit of Resistance Wire 4,000 – 18,000 με depending on gauge length
Maximum Water Pressure Tested to 2 MPa
Temperature Effect Less than 1 με / °C (-10° to 75°C)

Tension Measuring Gauges are commonly used to:

  • Measure load and strain in 0.6” (15.2 mm), 7-wire strands.
  • Measure load and strain in the bond length of rock and solid anchors.
  • Measure load and strain in prestressed and post-tensioned concrete.
  • Measure load and strain in cable bolts used as ground support in underground and open-pit mines.

View illustrations on how Tension Measuring Gauges are used for:

ITEM DESCRIPTION
TENSMEG Strain Gauge – 48 cm long ELTM4800LH
TENSMEG Electrical Isolation Coating ELTM1040
TENSMEG Installation Tool Set ELTM1000
TENSMEG Bonding System (10 gauges) ELTM1020
Heat Shrink Tubing (1 per gauge) ELTM1050
Cable (4 conductor x 22 AWG, polyurethane jacket 0.250”diameter) EL380004
AQUASEAL Waterproofing Tape (1/5 gauges) ELTM1030
TENSMEG Readout (QB120) ELTM-QB120

 

OPTIONAL EQUIPMENT

flexDAQ Data Loggers

File Name

Tension Measuring Gauge Tensmeg Instruction Manual

Resource Type

Manual
Language Version Download
English EXM0040F

File Name

TENSMEG: Tension Measuring Gauge for 7-Wire Strands

Resource Type

Brochure
Language Version Download
English LPB0013H
Portugese LPB0036A

Speak with an Expert

I’m very happy with the quality of the instrumentation and technical support from RST, as always. They worked with us from the initial stages of the project to ensure that we were fully prepared and equipped to use the RSTAR network for the first time. They delivered everything within the tight project time frame to ensure that there were no delays on site, and the submersible tilt meters looked like new even after over twelve months of being submerged in Thames water!
 
-Richard Lipscombe, BEng (Hons), Director & Principle Consultant - RL Geotechnical Ltd