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| Ventilation Pressure Survey Set | ||
| Select the Magnehelic gage for high accuracy - guaranteed within 2% of full scale. Using simple, frictionless Magnehelic movement, it quickly indicates low air or non-corrosive gas pressure - either positive, negative (vacuum) or differential. The design resists shock, vibration and over-pressures. No manometer fluid to evaporate, freeze or cause toxic or leveling problems. It’s inexpensive, too. |
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| Direct Recording Covergence Meter | ||
| “NMC” Convergence Meter has been developed primarily as a ow cost means of continuously recording roof / floor convergence in mines, where ready access to the measurement site is possible. Direct plots of convergence versus time are obtained over a range of upto 100 mm. The Convergence Meter consists basically of a clock-work driver, a chart paper drum and a spring loaded scriber arm mounted on telescopic tubes. In use the tubes are coupled between two pins located |
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| Suspension Convergence Indicator | ||
| 'NMC’ Suspension Convergence indicator consists of two pins ‘A’ & ‘B’ Pin ‘A’ is fixed to outer tube ‘D’ and other pin ‘B’ on movable rod ‘C’. Points between root and floor is fixed by grouted stations. |
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| Telescopic Convergence Indicator | ||
| It consists of an outer non-rusting tube inside which a close fitting rod slides. On this rod a scale is graduated with 1 mm least count by etching operation. The scale does not fade because of etching. |
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| Anchorage Testing Equioment Remote Control Type | ||
| DGMS Circular No. 19 of 1974 has advised that mines adopting Roof stitching with old haulage ropes and roof bolting should be equipped with reliable and tested equipment for carrying out the Torque Test, Anchorage Test and Sag Test.
Rock Bolt tester is a hydraulic device for performing rope or bolt pull test to measure their load bearing capacity or anchorability. |
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