Most smoke detectors work either by optical detection (photoelectric) or by physical process (ionization), but some of them use both detection methods to increase sensitivity to smoke. Smoke detectors may operate alone, be interconnected to cause all detectors in an area to sound an alarm if one is triggered, or be integrated into a fire alarm or security system.
A smoke detector cannot detect carbon monoxide to prevent carbon monoxide poisoning unless it has an integrated carbon monoxide detector. These are also available as a separate detector. Most companies which manufacture smoke detectors, manufacture carbon monoxide detectors as well.
Rate-of-rise (ROR) heat detectors react to the sudden change or rise in ambient temperature from a normal baseline condition. Any sudden temperature increase that matches the predetermined alarm criteria will cause an alarm. This type of heat detector can react to a lower threshold condition than would be possible if the threshold were fixed. A typical alarm may sound when the rate of temperature rise exceeds 12° to 15°F (6.7° to 8.3°C) per minute. A fixed temperature heat detector reacts when the ambient temperature reaches a fixed point. The most common fixed temperature point is 58°C or 136.4°F.
Each type of heat detector has its advantages, and one cannot say that one type of heat detector should always be used instead of another. If you were to place a rate-of-rise (ROR) heat detector above a large, closed oven, then every time the door is opened a nuisance alarm could be generated due to the sudden heat transient. In this circumstance the fixed threshold detector would probably be best. If a room filled with highly combustible materials is protected with a fixed heat detector, then a fast flaming fire could exceed the alarm threshold due to thermal lag. In this case the rate-of-rise heat detector may be preferred.
Heat detectors are commonly marked "Not a life safety device". Heat detectors are not meant to replace smoke detectors in life safety applications. While primarily for property protection, a heat detector will nonetheless notify of a fire in a utility area (i.e., laundry room or attic) faster than just relying on a smoke detector that might be on the other end of the house. This will allow extra time to evacuate the building or put out the fire if possible.
Resetting a fire alarm pull station after it has been operated normally requires building personnel or emergency responders to open the station using a key, which often is either a hex key or a more traditional key. Opening the station normally causes the handle to go back to its original position, allowing the alarm to be reset from the fire alarm control panel after the station has been closed.
In areas where false calls are a problem, pull stations may be covered with a clear plastic cover that sounds a loud tamper alarm when removed, creating focus on the fire alarm. If this is not a sufficient deterrent, the station may be loaded with a powdered or gel dye which can be used to help identify who pulled the alarm.
When a credential is presented to a reader, the reader sends the credential's information, usually a number, to a control panel, a highly reliable processor. The control panel compares the credential's number to an access control list, grants or denies the request, and sends a transaction log to a database. When access is denied the door remains locked. If there is a match the control panel operates a relay that in turn, unlocks the door. Often the reader provides feedback, such as a flashing red LED for an access denied and a flashing green LED for an access granted.
An example of how this system works is when a passive infrared or other sensor is triggered a designated number of video frames from before and after the event is sent to the central station.
A second video solution can be incorporated into to a standard panel, which sends the central station an alarm. When a signal is received, a trained monitoring professional accesses the on-site digital video recorder (DVR) through an IP link to determine the cause of the activation.
LiteWatch solar solutions provide an additional layer of security by illuminating signs at night. By visibly warning intruders, the LiteWatch 7X-SL1 solar light helps deter vandalism and break-ins. The LiteWatch 7X-SL1 fits on any standard yard sign stake and comes with a rechargeable AA battery that charges throughout the day, and automatically turns itself on at night.
With LiteWatch, you are giving your customers an added sense of security in knowing their security sign is visible at night, while letting the world know your company is providing the protection.
Contact your Diamond Szecurity Sales Representative for more information.
Glass break detectors fall into two general categoris – Acoustic and Shock sensors. Acoustic detectors protect all of the windows in a room or area. They are an important part of an effective perimeter detection system. It is very important to choose the right sensor for a particular application or environment. We offer you a variety of choices for virtually any glassbreak application.
Shock detectors protect a single expanse of glass. Breaking glass produces specific shock frequencies that travel through glass and window frames. When shock sensors feel the wave generated by breaking glass, they signal an alarm. These sensors mount directly on the glass or the frame and give you a product virtually immune to false alarms.
There are basically three types of sensors used in motion detectors spectrum. Passive infrared sensors (PIR) looks for body heat, No energy is emitted from the sensor. Ultrasonic (Active) sensor sends out pulses and measures the reflection off a moving object. Microwave (Active) Sensor sends out microwave pulses and measures the reflection off a moving object. Similar to a police radar gun.
Diamond Security | Bellport, NY | Tel.: (631)775-7580 | Fax: (631)775-7581 | NYS Lic# 12000043827