Mechanical Telltales
NOTE: This is a legacy and discontinued product not available for order..
The Mechanical Telltales from Trolex’s RMT product line are low-cost, visual tools for monitoring movement in a tunnel roof, typically for use in underground mines.
Overview
NOTE: This is a legacy and discontinued product not available for order.
The Mechanical Telltales from Trolex’s RMT product line are low-cost, visual tools for monitoring movement in a tunnel roof, typically for use in underground mines. The RockMonitor XM Mechanical Telltale is a mechanical, non-electrical equipment that is operated and installed under human power only. The instrument has no potential ignition hazards which are not solely due to the materials of construction. The RockMonitor XM Mechanical Telltale is therefore outside the scope of the ATEX Directive and does not require IECEx certification for use in Hazardous Locations.
All models use spring leg anchors for ease of installation up-hole from the roof. The AWTT model is ATEX/IECEx rated for use in hazardous environments.
MECHANICAL TELLTALES SPECIFICATIONS
| ITEM | SPECIFICATION |
| Ambient temperature: | 0 °C to +50 °C |
| Storage temperature: | -20 °C to +50 °C |
| Humidity: | 10 to 98% |
| Protection classification: | Dust and waterproof to IP54 |
| Housing materials: | SS316, PC/ABS |
| Net weight: | 2.1kg |
| Measurement range: | 0 to 150 mm (without reset) |
| Accuracy: | <1.0mm |
| Repeatability: | <0.1mm |
| Labels | 1mm visual markings |
| Number of Anchors | 2 or 4 |
| Hole Size | 35-50mm hole (others available on request) |
| Anchor Options | 60mm or 100mm spring leg span |
| Head Assembly Dimensions | Water Diverting = 215mm Length x 100mm Diameter
Non-Water Diverting (plastic sleeve) = 300m Length x 100mm Diameter |
| Shear Spring | Extension spring located between the spring anchor and longest indicator suspension wire. This can be used to detect wires that are becoming trapped in the hole. |
| Water Diverting Sleeve | Model suitable for wet applications |
| Plastic Sleeve | Open Top/Bottom for dirt to pass through – for dry applications |
Mechanical Telltales are commonly used for:
- Fully proven in coal mine tunnels.
- Typically installed in vertical boreholes close to the face and near to the centre of the heading as part of the normal cycle by purpose-trained personnel.
View illustrations on how Mechanical Telltales are used in underground mines.
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