Auto warning Tell Tale
Auto warning Tell Tale is an improvised version of the familiar mechanical single height Tell Tale. This single height AUTO WARNING TELL TALE with multi-directional mounting with provisions of mounting on junctions of coal/metal mines. The design and construction of this device & blasting faces is confirming intrinsically safe applications for use in gas group 1 Atmosphere and belongs to category ex "ia" and EPL "Ma" as per the guideline laid down in DGMS circular no DGMS /S&T/Tech CIR/ (Approval) no. 15 dated 04/06/2015 or latest amendment.
- The device is simple, accurate and reliable.
- It gives automatic visual indication when the movement of roof strata exceeds safety levels.
- Auto Warning Tell Tale is rapid active and easy to install.
The instrument has a dual reading system i.e. by LED flashing at a pre-set level and coloured band Scales reading the actual roof dilation.
The flashing lights are visible from 100 m distance and the warning attracts the attention of the operating personnel.
The installation of Auto Warning Tell Tale will protect the personnel & machinery from impending roof falls.
This device can detect both the downward movement as well upward movement of the roof.