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Uses UV and IR pulses to detect particle sizes and reject unwanted light sources.
Provides wide viewing angle for emitter tracking, tolerating less precise installation and drift.
Uses UV and IR pulses to detect particle sizes and reject unwanted light sources.
Provides wide viewing angle for emitter tracking, tolerating less precise installation and drift.
The OSID (Open-area Smoke Imaging Detection) system by Xtralis represents a significant advancement in projected beam smoke detection technology. It leverages advanced dual-wavelength projected beams and optical imaging to provide early warning smoke detection, offering a cost-effective, reliable, and easy-to-install solution that addresses common issues associated with traditional beam detectors, such as false alarms and alignment difficulties.
The core function of the OSID system is to measure smoke levels within a protected area by analyzing beams of light projected across that space. A single OSID Imager can monitor up to seven Emitters, allowing for broad coverage. The system incorporates two key innovations in smoke detection: dual wavelength particle detection and optical imaging with a CMOS imaging chip.
Dual wavelength particle detection is achieved by having each Emitter project a unique sequence of ultraviolet (UV) and infrared (IR) pulses. These pulses are synchronized with the Imager, enabling the system to reject unwanted light sources. By utilizing two distinct wavelengths, the system can differentiate between particle sizes. The shorter UV wavelength interacts strongly with both small and large particles, while the longer IR wavelength is primarily affected by larger particles. This dual wavelength path loss measurement capability allows the detector to provide consistent smoke obscuration measurements while effectively rejecting the presence of dust particles or solid objects that might otherwise trigger false alarms.
Optical imaging is facilitated by a CMOS imaging chip within the OSID Imager. This chip provides a wide viewing angle, allowing the detector to locate and track multiple Emitters simultaneously. This capability significantly reduces the need for precise installation and enables the system to compensate for natural shifts in building structures over time. The Imager also employs optical filtering, high-speed image acquisition, and intelligent software algorithms to achieve enhanced stability and sensitivity, along with greater immunity to variations in high-level lighting.
The OSID system communicates status information, including Fire Alarm, Trouble, and Power, through various means. Status LEDs on the Imager provide visual indications, while dedicated Trouble and Alarm relays offer conventional alarm interfaces for straightforward integration into fire systems. Additionally, a Remote Indicator interface is available. Specific Trouble (Fault) conditions are identified through coded flashes of the Trouble LED, aiding in quick diagnosis. The system offers three selectable alarm thresholds, allowing users to configure the sensitivity based on specific environmental requirements.
The OSID system is designed for ease of use and flexibility in configuration. On the Imager, a termination card provides all necessary field wiring terminals, and DIP switches allow users to configure the detector for specific applications.
Alignment of the Emitter is simplified through the use of a laser alignment tool. Users can rotate the optical spheres until the laser beam from the alignment tool is positioned close to the Imager. The Imager itself is aligned similarly, ensuring its Field of View (FOV) encompasses all Emitters. If an Emitter is missing or falls outside the Imager's field of view, a Trouble or Fault condition will be indicated.
The system is highly tolerant of minor misalignments and environmental factors. Its ability to tolerate alignment drift means that minor shifts in building structures or components will not compromise its performance. The automatic commissioning feature allows the system to be set up in under ten minutes, significantly reducing installation time. Simple DIP switch configuration further streamlines the setup process.
OSID systems can be configured to suit a variety of detection spaces by selecting the appropriate number of Emitters and the type of Imager. Different Imager types are distinguished by the lens used, which dictates the field of view and range of the system. For instance, the 10° Imager offers a narrow 7° horizontal and 4° vertical field of view, suitable for shorter distances, while the 90° Imager provides a wide 80° horizontal and 48° vertical field of view, accommodating up to seven Emitters and covering larger areas.
The system components can be mounted directly to a surface or secured using supplied mounting brackets. For enhanced flexibility and reduced installation time and cost, battery-powered Emitters are available, offering up to five years of battery life.
The OSID system is engineered for simple and easy maintenance. Its high tolerance to dust and dirt means it requires minimal upkeep in practice. Preventative maintenance is generally limited to occasional cleaning of the optical faces of the detector components.
An internal heating option is available on the Imager to prevent condensation from forming on the optical surface, ensuring continuous optimal performance. A reset input allows for an external signal to reset the device, which can be useful for troubleshooting or system restarts. The system also includes an event log capable of storing up to 10,000 events, providing valuable data for diagnostics and maintenance.
General| Operating Temperature | -10°C to +55°C |
|---|---|
| Current Consumption | Typically 25mA |
| Communication | Optional RS485 |
| Sensitivity | Adjustable |
| Humidity | 10% to 95% RH (non-condensing) |
