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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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. There are 3 models of telltales: Auto-Warning Telltale (AWTT), Mechanical Telltale and Rotary Telltale. All models include a visual scale for monitoring movement (in mm). The AWTT model also includes LED’s for indication of movement above a set threshold, from a further distance.

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.


AUTO-WARNING TELLTALE (AWTT) SPECIFICATIONS

ITEM SPECIFICATION
Trigger Threshold Factory pre-set at 5mm travel, user adjustable
Display Facility Red flashing LEDs, minimum of two, four as standard
Accuracy ±0.5mm, trigger level
Number of Anchors 1
Hole Size 35-50mm hole
Anchor Options 60mm or 100mm spring leg span
Anchor s/s Wire Length 1 to 15 metres (10m supplied as standard)
Certification Approvals ATEX Ex I M1, Ex ia I Ma and IECEx, Ex ia I Ma (-20°C ≤ +40°C)
Operational Life (once triggered) Approx. 2months (continuous flashing)
Power Source Supplied with 1 Alkaline Battery, not user replaceable
Environmental Sealed-for-life electronics module to IP67
Head Assembly Dimensions 215mm Length x 100mm Diameter
Weight 0.5kg
Operational Temperature Range -20 to + 40°C (Note: higher temperatures reduce battery life)

 

MECHANICAL TELLTALES SPECIFICATIONS

ITEM SPECIFICATION
Labels 1mm visual markings
Number of Anchors 2 or 3
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.
  • Mechanical Telltale + Rotary Telltale:
    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.
  • Auto-Warning Telltale:
    Typically installed in vertical boreholes where access may become restricted or would constitute a high risk for direct or close-up viewing.

View illustrations on how Mechanical Telltales are used in underground mines.

AUTO-WARNING TELLTALE (AWTT) ORDERING INFO

ITEM PART #
Auto Warning Telltale TTAW01
FOR HOLE DIAMETER 35-50 MM:
Number of LEDS 2 or 4
Anchor Depth (specify) 10 m = standard
Colour Ranges on Label (specify) White: 5 mm common

Green: 25 mm common

Yellow: 25 mm common

Red: 25 mm common

 

ACCESORIES – 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

 

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

 

ROTARY TELLTALE ORDERING INFO

ITEM PART #
Rotary Telltale TTRT01
FOR HOLE DIAMETER 35-50 MM:
Anchor Depth (specify) 10 m = standard
Colour Ranges on Label (specify) White: 5 mm common

Green: 25 mm common

Yellow: 25 mm common

Red: 25 mm common

File Name

Mechanical Telltales

Resource Type

Brochure
Language Version Download
English EXB0043A

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