Abstract: A personal mask testing system (PMTS) is of a size of a human hand. The PMTS has several energy efficient features that permit running the PMTS from a battery source within the housing. The PMTS also includes a replaceable vapor source.

Abstract: A buffer circuit (100) receives a selection signal (SFI), which selects either a first or second threshold voltage for receiving an input signal (SSI) at a logic gate (6). A switch (1) and a level-shifter (13) are used in combination to set a voltage at a node (12). The first input signal is coupled to the switch. The logic gate is coupled to the node, and the voltage level at the node sets the threshold voltage of the logic gate of the buffer circuit.

Abstract: A buffer circuit (100) receives a selection signal (SFI), which selects either a first or second threshold voltage for receiving an input signal (SSI) at a logic gate (6). A switch (1) and a level-shifter (13) are used in combination to set a voltage at a node (12). The first input signal is coupled to the switch. The logic gate is coupled to the node, and the voltage level at the node sets the threshold voltage of the logic gate of the buffer circuit.

Abstract: One aspect of the present invention discloses a deflagration suppression system, which is particularly applicable to delagrations involving combustible gases. The deflagration suppressant in the system is typically water which is dispersed in the combustible gas as a stream of droplets having a Sauter mean Diameter of no more than about 80 microns. The system can include a combustible substance detector to detect potentially explosive concentrations of a combustible substance, such as the combustible gas, before the onset of a deflagration.Another aspect of the subject invention discloses a liquid atomizing device which is particularly applicable to the deflagration suppression system. The liquid atomizing device atomizes the liquid in a carrier gas and the liquid droplets are further decreased in size by increasing the velocity of the droplets to a supersonic velocity.

Abstract: One aspect of the present invention discloses a deflagration suppression system, which is particularly applicable to deflagrations involving combustible gases. The deflagration suppressant in the system is typically water which is dispersed in the combustible gas as a stream of droplets having a Sauter mean Diameter of no more than about 80 microns. The system can include a combustible substance detector to detect potentially explosive concentrations of a combustible substance, such as the combustible gas, before the onset of a deflagration.Another aspect of the subject invention discloses a liquid atomizing device which is particularly applicable to the deflagration suppression system. The liquid atomizing device atomizes the liquid in a carrier gas and the liquid droplets are further decreased in size by increasing the velocity of the droplets to a supersonic velocity.