Vibrating Wire Strain Gauges Model IG 1200/1300
- Robust and sturdy construction.
- High sensitivity and reliability.
- Long term stability.
- Easy installation and minimum protection needed after installation.
Externally mounted magnet assembly on the other hand is prone to corrosion as it is made in two halves, which are externally clamped on to the tube. This does not ensure proper sealing at the joint. Thus water can seep and with time cause corrosion on the magnet, resulting in failure.
Embedment type strain gauges are provided with built-in stainless steel flanges while the groutable and arc weldable type have the same design but different end plugs. By the use of the appropriate type of mounting blocks, the same strain gauge can be arc welded on to the steel structures such as tunnel linings and supports or grouted or epoxy bonded on the surface of concrete structures.
To take care of space limitation, for vertical measurement of strain across thin concrete lining, embedment strain gauges with 55mm gauge length are used. For example, on pavements.
| Vibrating Wire strain Gauges Model | ||
| Model | IG 1200 | |
| Embedment | IG 1200E | |
| Weldable | IG 1200W | |
| Groutable | IG 1200G | |
| Gauge length | 125 mm | |
| Gauge factor | 2.487x 10-3 microstrain/Hz2 | |
| Range | ± 1500 micro strain | |
| Sensitivity | 1 microstrain | |
| Material (outer body) | Stainless steel | |
| Coil Resistance | 140 – 160 Ohm @ 25°C | |
| Thermistor YSI 44005 or equivalent | (3k Ohm @ 25°C) | |
Accessories:
a. 5 position rosette for mounting strain gauge at different angles and in different planes.
b. No-stress container to evaluate strain produced due to factors other than load.
c. Brackets for arc welding on structures or grouting.
d. 6 position junction box to terminate strain gauges installed on Rosette.