Ajax Relay
- 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 and frame rate settings. 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.
|
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 a minimum of 2 Terabytes per 4 x 2-4MP HD cameras, as this should give you 2 weeks to a month with a few adjustments on motion detected recording. You may only require the full 25 frames per second on certain cameras if things are fast moving.
(All of our hard drives come fitted and are CCTV specific from one of the major brands)
Ajax Relay
Radio channel controller for remote control of low current equipment. It is used to activate electric locks, gates and swing gates, rolling shutters and blinds, and to restart modems and routers. The device controls electric power supply by means of relay, which closes and opens the dry contact. Operates from 7—24 V DC voltage sources. The dry contact is not galvanically connected to the device itself. The device is installed in junction boxes, distribution boards, and enclosures of switching units.
Tech specs
- Radio channel relay unit
- Wireless
- Installs into electric switchboard, junctionbox
- Compatible with Ajax Hub, Hub Plus and ReX
- Electromagnetic relay
- 200,000 switch-ons
- Voltage protection Max — 36.5 V, min — 6.5 V
- Maximum load current 5A at 36V DC, 13A at 230V AC
- MAximum temperature protection 65°C at the place of installation
- Alaram signal delivery time 0.15 Seconds
- Power supply 7—24 V (DC only)
- Jeweller radio technology - Communication range with central unit — up to 1,000 m in an open space
Two-way communication between devices
Operating frequencies — 868.0−868.6 MHz
Self-adjusting RF output power — up to 25 mW
Block encryption based on AES algorithm
Device scanning period — 12−300 s - Operating temperature 0°С to +64°С
- Protection class IP20
- Protection against Jamming
- Dimension 39 х 33 х 18 mm
- Weight 32g
- CE Certification
- 2 year replace or repair warranty
