A burst temperature indicator system for determining when an electrical contact or other component reaches a predetermined temperature. In operation, a trace material may disperse into a surrounding environment, and be detected, when the electrical component reaches a predetermined threshold temperature. One or more foil barriers may be ruptured or broken by temperature-induced gas pressure. According to another aspect of this disclosure, a rupture disk may be burst at a predetermined temperature to generate, or enable emission of, a light signal. According to another aspect, a rupture disk device acts as, or is associated with, an engine to drive one or more electro-mechanical and/or acoustic devices to signal the occurrence of a predetermined temperature.

A particle detection system including a particle detector in fluid communication with at least two sample inlets for receiving a sample flow from a monitored region. The particle detector includes detection means for detecting the level of particles within the sample flow and outputting a first signal indicative of the level of particles within the sample flow. A flow sensor is located downstream of the sample inlets for measuring the flow rate of the sample flow and outputting a second signal indicative of the flow rate of the sample flow. At least a first sample inlet is normally open to the monitored region for receiving at least part of the sample flow. At least a second sample inlet is normally closed to the monitored region but is openable to the monitored region in response to a change in environmental conditions in the monitored region. The particle detection system further includes processing means adapted for receiving the first and second signals and comparing the first signal to a predetermined threshold level and comparing the second signal to a predetermined threshold flow rate, and generating an output signal based on the respective comparisons of the first and second signals. A method of particle detection is also described.

A particle detection system including a particle detector in fluid communication with at least two sample inlets for receiving a sample flow from a monitored region. The particle detector includes detection means for detecting the level of particles within the sample flow and outputting a first signal indicative of the level of particles within the sample flow. A flow sensor is located downstream of the sample inlets for measuring the flow rate of the sample flow and outputting a second signal indicative of the flow rate of the sample flow. At least a first sample inlet is normally open to the monitored region for receiving at least part of the sample flow. At least a second sample inlet is normally closed to the monitored region but is openable to the monitored region in response to a change in environmental conditions in the monitored region. The particle detection system further includes processing means adapted for receiving the first and second signals and comparing the first signal to a predetermined threshold level and comparing the second signal to a predetermined threshold flow rate, and generating an output signal based on the respective comparisons of the first and second signals. A method of particle detection is also described.

Some embodiments are directed to a lockdown apparatus for facilitating initiation of lockdown procedures at a facility. The lockdown apparatus can include an actuator configured to transmit a lockdown initiation signal upon being actuated. The actuator can be configured to be recognizably distinguishable from a fire alarm actuator. The lockdown apparatus can also include a lockdown communicator configured to produce a lockdown initiation communication for communicating initiation of lockdown procedures to the facility occupants and individuals not disposed proximate the facility upon transmission of the lockdown initiation signal, the lockdown communication being recognizably distinguishable from the fire alarm communication. The lockdown communicator can also include a vibrator that creates vibrations of sufficient strength to be perceivable by facility occupants upon transmission of the lockdown initiation signal.

Some embodiments are directed to a lockdown apparatus for facilitating initiation of lockdown procedures at a facility. The lockdown apparatus can include an actuator configured to transmit a lockdown initiation signal upon being actuated. The actuator can be configured to be recognizably distinguishable from a fire alarm actuator. The lockdown apparatus can also include a lockdown communicator configured to produce a lockdown communication for communicating initiation of lockdown procedures to the facility occupants and individuals not disposed proximate the facility upon transmission of the lockdown initiation signal, the lockdown communication being recognizably distinguishable from the fire alarm communication. The lockdown communicator can also include a vibrator that creates vibrations of sufficient strength to be perceivable by facility occupants upon transmission of the lockdown initiation signal.

Some embodiments are directed to a lockdown apparatus for facilitating initiation of lockdown procedures at a facility. The lockdown apparatus can include an actuator configured to transmit a lockdown initiation signal upon being actuated. The actuator can be configured to be recognizably distinguishable from a fire alarm actuator. The lockdown apparatus can also include a lockdown communicator configured to produce a lockdown initiation communication for communicating initiation of lockdown procedures to the facility occupants and individuals not disposed proximate the facility upon transmission of the lockdown initiation signal, the lockdown communication being recognizably distinguishable from the fire alarm communication. The lockdown communicator can also be configured to produce a lockdown procedure communication, which is different from the lockdown initiation communication, for communicating to the facility occupants a predetermined lockdown procedure for adoption by the facility occupants subsequent to the initiation of the lockdown procedures.

Some embodiments are directed to a lockdown apparatus for facilitating initiation of lockdown procedures at a facility. The lockdown apparatus can include an actuator configured to transmit a lockdown initiation signal upon being actuated. The actuator can be configured to be recognizably distinguishable from a fire alarm actuator. The lockdown apparatus can also include a lockdown communicator configured to produce a lockdown communication for communicating initiation of lockdown procedures to the facility occupants and individuals not disposed proximate the facility upon transmission of the lockdown initiation signal, the lockdown communication being recognizably distinguishable from the fire alarm communication. The lockdown communicator can also be configured to produce a lockdown procedure communication, which is different from the lockdown initiation communication, for communicating to the facility occupants a predetermined lockdown procedure for adoption by the facility occupants subsequent to the initiation of the lockdown procedures.

Some embodiments are directed to a lockdown apparatus for facilitating initiation of lockdown procedures at a facility. The lockdown apparatus can include an actuator configured to transmit a lockdown initiation signal upon being actuated. The actuator can be configured to be recognizably distinguishable from a fire alarm actuator. The lockdown apparatus can also include a lockdown communicator configured to produce a lockdown communication for communicating initiation of lockdown procedures to the facility occupants and individuals not disposed proximate the facility upon transmission of the lockdown initiation signal, the lockdown communication being recognizably distinguishable from the fire alarm communication. The lockdown communicator can also be configured to produce a lockdown procedure communication, which is different from the lockdown initiation communication, for communicating to the facility occupants a predetermined lockdown procedure for adoption by the facility occupants subsequent to the initiation of the lockdown procedures.

Some embodiments are directed to a lockdown apparatus for facilitating initiation of lockdown procedures at a facility. The lockdown apparatus can include an actuator configured to transmit a lockdown initiation signal upon being actuated. The actuator can be configured to be recognizably distinguishable from a fire alarm actuator. The lockdown apparatus can also include a lockdown communicator configured to produce a lockdown initiation communication for communicating initiation of lockdown procedures to the facility occupants and individuals not disposed proximate the facility upon transmission of the lockdown initiation signal, the lockdown communication being recognizably distinguishable from the fire alarm communication. The lockdown communicator can also include a vibrator that creates vibrations of sufficient strength to be perceivable by facility occupants upon transmission of the lockdown initiation signal.

Some embodiments are directed to a lockdown apparatus for facilitating initiation of lockdown procedures at a facility. The lockdown apparatus can include an actuator configured to transmit a lockdown initiation signal upon being actuated. The actuator can be configured to be recognizably distinguishable from a fire alarm actuator. The lockdown apparatus can also include a lockdown communicator configured to produce a lockdown communication for communicating initiation of lockdown procedures to the facility occupants and individuals not disposed proximate the facility upon transmission of the lockdown initiation signal, the lockdown communication being recognizably distinguishable from the fire alarm communication. The lockdown communicator can also include a vibrator that creates vibrations of sufficient strength to be perceivable by facility occupants upon transmission of the lockdown initiation signal.