Mechanical Telltales

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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.

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Product Features

  • Continuous monitoring of strata displacement
  • Strata displacement measurement up to 150mm (without reset)
  • Resettable height measurement for movement in excess of 150mm
  • Two or four monitoring points (anchor heights) between 0.6m and 16m
  • Highly visible display of displacement measurement on-device

Overview

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.

MECHANICAL TELLTALE ORDERING INFO

ITEM PART #
Telltale Mechanical TT
Head Assembly Type W – Water Diverting (wet hole)

P- Plastic Tube (dry hole)

Hole Diameter 35-50 mm
Number of Anchors 2 or 3
Shear Spring N – (no spring)

S – (with shear spring)

Anchor Depths (specify) Depth 1: 2.5 m common

Depth 2: 5.5 m common

Depth 3: 10 m common

Color Ranges on Label (for Anchor Depths 1, 2, and 3)(specify) White: 5 mm common

Green: 25 mm common

Yellow: 25 mm common

Red: 25 mm common

 

ACCESSORIES – INSTALL TOOLS (FOR ALL MODELS) ORDERING INFO

PART # DIAMETER DESCRIPTION
TTR01 Installation Rod 3/4 dia 1m machined For Telltales or Wire Extos TTR01
RD-PL-02 Poly Drain Rod 3/4 x 1 m Universal Fittings Riveted 11811
TTR01.07 Installation Rods, 7 of 3/4 dia x1m 1 Slotted, 6 standard for Telltales or Wire Extos
TTR01.12 Installation Rods, 12 of 3/4 dia 1m 1 Slotted, 11 standard for Telltales or Wire Extos
TTR01.20 Installation Rods, 20 of 3/4 dia 1m 1 Slotted, 11 standard for Telltales or Wire Extos

File Name

Mechanical Telltales

Resource Type

Brochure
Language Version Download
English P5625.1608 Rev A

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