Smoke Screen Sentinel SC20 Security Fog/Cloak Machine
- CCTV Lens Guide
- Hard Drive Size Guide
Unless selecting a vari-focal camera (with an adjustable lens) It is important to select the correct camera lens option for where the camera is to be positioned. A smaller lens will give you a wider angle but will be "zoomed out more", while a bigger lens will narrow the angle down and "zoom in more". See below to give you some idea on angles of Megapixel HD Cameras:
| Lens in mm | Approx Viewing Angle (degrees) | Ideal Distance (metres) | Typical usage/notes |
|---|---|---|---|
| 2.8 | 106 | <6 | For seeing as much of the immediate area as possible such as above a doorway/low down/garage soffits (edges can appear slightly warped/distorted) - clearly "zoomed out" |
| 3.6/4 | 83-90 | <12 | A great general purpose option giving great coverage still in the corner of a room or higher up on second floor soffits with less distortion - more of a natural "zoom" |
| 6 | 56 | 6-20 | Narrows down the angle and zooms in to look past the immediate area a little to gain more detail - down a driveway for example from higher up |
| 12 | 24 | 20+ | Zooms in significantly more to look at a gate, entrance or adjascent building |
| 16 | 19 | 24+ | As above but more so |
The amount of hard drive space you require is dictated by how many cameras, as well as their resolution, frame rate settings, and whether you have H.265 encoding enabled or not to save space (We advise turning it on to double the capacity shown below with ease).
Finally, you can often make your storage space last a lot longer by enabling motion-detected recording rather than continuous, especially if there are long periods of no activity (to perhaps double or more these figures again).
|
Resolution (Megapixels) |
Days of storage provided by 1TB per camera (continuous - full 25 frames per second) |
Days of storage provided by 1TB per 4 cameras (continuous - full 25 frames per second) |
Days of storage provided by 1TB per 4 cameras (50% motion- 15 frames per second) |
|---|---|---|---|
| 1 | 44 | 11 | 36 |
| 2 | 22 | 5 | 18 |
| 3 | 17 | 4 | 14 |
| 4 | 11 | 3 | 9 |
| 5 | 9 | 2 | 8 |
| 6 | 8 | 2 | 6 |
| 8 (4K) | 5 | 1 | 4 |
| 12 | 4 | 0.5 | 3 |
As a rule of thumb, we recommend 2 Terabytes for a 4 x 4/5MP HD camera setup, as this should give you approx 2 weeks using H.265 @ 20fps and that is on continuous, not motion-detected recording.
(You may only require the full 25 frames per second on certain cameras if things are fast-moving - ie above a till)
You can also use the Hikvision online calculator to work out what works best for you specifically: https://tools.hikvision.com/ca...
(All of our hard drives come fitted and are CCTV-specific from one of the major brands)
PLEASE NOTE: BATTERIES ARE NOT INCLUDED with the SC20. This machine requires TWO of the associated batteries listed under related items at the bottom of the page.
Meet the Sentinel SC20: Small in Size, Monumental in
Protection. Don’t let its compact form deceive you; this little
dynamo packs a punch that rivals its larger counterparts.
It’s the ideal choice for those who demand top-tier security
without breaking the bank. Economical yet fiercely effective,
the SC20 delivers optimal fog coverage that ensures you’re
never compromising on your peace of mind.
This ultra-lightweight SC20, weighing under 10kg when
installed, is a titan in a compact frame. Envision multiple units,
strategically positioned, forming an unyielding security matrix.
One trigger sets off a cascading fog, blanketing spaces with
dense haze. Despite its minimalistic weight, the Sentinel
SC20 offers not just economical security, but also tactical
brilliance
In a world where risks are ever-changing, the Sentinel SC20
offers dynamic, uncompromising protection tailored to fit your
unique needs.
FEATURES
• Our smallest, lightest Sentinel fog generator
• Minimum 40 minutes off-mains operational capability
• 40 second initial burst for maximum smoke generation in risk critical areas
• 3-year warranty
• Energy save mode cuts costs in periods when the generator is not immediately needed
• Supports automatic re-firing via screen-sensor technology
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New Sentinel range (security smoke generators)
