Haydon HAY-FIRE-24R 24V DC Double Pole Fire Alarm Relay Module with Surface Back Box
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)
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Haydon HAY-FIRE-24R 24V DC Double Pole Fire Alarm Relay Module with Surface Back Box
The Haydon HAY-FIRE-24R is a professional 24V DC fire alarm relay interface module developed to provide safe and dependable switching between fire alarm control equipment and external electrical devices. Designed for life safety applications, it enables fire alarm systems to activate or isolate auxiliary equipment automatically during an alarm condition, improving overall building safety and system integration.
Operating from a 24V DC supply (±10%), the relay module features a double pole (DP) volt-free relay, allowing two independent circuits to be switched simultaneously. This provides installers with greater flexibility when controlling multiple outputs or interfacing with third-party equipment while maintaining electrical isolation between systems.
The HAY-FIRE-24R is commonly used to control magnetic door retainers, access control systems, automatic door releases, smoke ventilation systems, lift homing controls, HVAC shutdown systems and building management systems (BMS). Its volt-free contacts make it compatible with a wide variety of fire alarm installations requiring reliable relay switching without introducing additional voltages into connected equipment.
KEY FEATURES
- 24V DC fire alarm relay interface module
- Double pole (DP) volt-free relay contacts
- Operating voltage: 24V DC ±10%
- Nominal current consumption: 22mA
- Relay coil impedance: 1067Ω
- Suitable for switching auxiliary fire alarm equipment
- Ideal for door release and access control integration
- Compatible with smoke ventilation and HVAC shutdown systems
- Suitable for lift homing and building management interfaces
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