File Name
Mechanical Telltales
Resource Type
Brochure| Language | Version | Download |
|---|---|---|
| English | P5625.1608 Rev A |
|
Mechanical Telltales
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
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 |
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