Stability monitor
Leader SENTRY B2

Firefighter and USAR applications

Leader SENTRY laser allows to monitor the distance of the structure to be monitored during a fire, as well as during a rescue-clearance

Accurate for optimal safety

Leader SENTRY detects a movement of 5 mm at a distance of 30 m. A telescopic sight can point accurately the unstable structure targeted.


Multiple maximum movement thresholds (from 5 to 100 mm) can be selected. When a movement is sensed that exceeds the selected threshold, the sound alarm is triggered (98 dB).
It continuously monitors detected movements and displays changes on its screen for real-time awareness.

Multiple monitoring

2 lasers can be connected to the device to simultaneously monitor 2 sides of an unstable building for the safety of rescue teams working around or inside the structure.
Product features
Technical sheet
Associated products


Leader SENTRY is a stability monitor that detects the structural movements of an unstable building. Its laser continuously monitors detected movements and displays
changes on its screen for real-time awareness.

Leader SENTRY can detect a 5 mm structure movement at a distance of 30 m! A telescopic sight helps to point the laser accurately at the targeted unstable structure.

It allows firefighters and USAR teams to be alerted by a visual and audio alarm (98dB) when a structure movement, however small, is detected.


Primary function
Monitors movements of unstabilised and stabilised structures at distance (30m) = far safer
Sentry B2 (2 laser beams with control box)
Risk during implementation
None as it is done in a chosen safe area and before any risk is taken, monitoring larger structurers and larger areas of work, thus protecting larger numbers of people
Telemeter laser beam
Monitoring method
Monitors and detects movements from 5 mm to 100 mm.
Several thresholds (5, 10, 20, 40, 70, 100 mm)
Live monitoring
Sentry displays distance to target(s) in real time for movement evaluation allowing to choose relevant threshold
Unit calibration in field
1 audible alarm level at 98 dB ensures alarm to be heard or OFF
Alarm option
Sentry proposes an out put source to plug a remote loud speaker
Flash light
2 blinking rythms: working signal or alarm triggering
Out short-duration interruptions of the beam passing through it (e.g. people, birds etc.) are filtered.
Designed for external positioning during rescue response
Avoid shiny surfaces or too bright and too dark surfaces
Laser efficiency (distance) decrease with high luminosity from sun
Does not work with smokes, rain or fog.
Power supply
3 means:
110/220V 50/60 Hz mains power pack with adaptors transformer to 110/220V
12V cable with vehicule AC adaptor
Cell batteries:16 AA alkaline batteries supplied
Running time
By using the 2 sets of battery supplied:
6 hrs (2 lasers)

By using standard batteries:

2 connected lasers: 9 hrs with 8x AA lithium battery (not supplied)
3 hrs with 8x AA alkaline battery (supplied)

1 connected laser: 14 hrs with 8x AA lithium battery (not supplied)
7 hrs with 8x AA alkaline batteries (supplied)
IP 54 (rain resistant)
Laser on tripod cable connected to control board in case
12 months
Number of lasers
2 class 2 lasers equipped respectively with 4m and 20m of orange anti-abrasion cable
Number of tripods
2 robust tripods, height-adjustable to avoid interference with site activity (1.80m) with a built-in hook for attaching ballast at their centre
Number of ball joints
2 ball joint allowing tripod – laser connection.
Shockproof and waterproof (when closed) containing the
console control monitor
Dimensions (W x H x D)
670 x 510 x 372 cm
26.5 kg
Operating temperature
from -25°C to +50°C
Storage temperature
from -40°C to +70°C
Power supply
On mains with 110/220V 50/60 Hz transformer and international adapters
or on cigarette lighter socket (12V cable with adapter)
or with 16 AA alkaline batteries (emergency power supply)
Autonomy with emergency power supply
2 connected lasers: 9h with 8 AA lithium batteries (not supplied)
1 connected laser: 15.5h with 8 AA lithium batteries (not supplied)
2 connected lasers: 3h with 8 AA alkaline batteries (supplied)
1 connected laser: 7h with 8 AA alkaline batteries (supplied)
6h (2 lasers) and 14h (1 laser) using the 2nd series of batteries (thanks to the 16 alkaline batteries supplied)



Product reference



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