In some examples, a system includes an article of personal protective equipment (PPE) having at least one sensor configured to generate a stream of usage data; and an analytical stream processing component comprising: a communication component that receives the stream of usage data; a memory configured to store at least a portion of the stream of usage data and at least one model for detecting a safety event signature, wherein the at least one model is trained based as least in part on a set of usage data generated by one or more other articles of PPE of a same type as the article of PPE; and one or more computer processors configured to: detect the safety event signature in the stream of usage data based on processing the stream of usage data with the model, and generate an output in response to detecting the safety event signature.

In some examples, a system includes an article of personal protective equipment (PPE) having at least one sensor configured to generate a stream of usage data; and an analytical stream processing component comprising: a communication component that receives the stream of usage data; a memory configured to store at least a portion of the stream of usage data and at least one model for detecting a safety event signature, wherein the at least one model is trained based as least in part on a set of usage data generated by one or more other articles of PPE of a same type as the article of PPE; and one or more computer processors configured to: detect the safety event signature in the stream of usage data based on processing the stream of usage data with the model, and generate an output in response to detecting the safety event signature.

Implementations of the disclosure relate to apparatus and methods for supporting and testing respirators during testing operations. In one aspect, the respirators are tested to determine if the respirators meet a testing standard. In one implementation, a test fixture for supporting respirators during testing operations includes a fixture. The fixture includes a base portion, and a first protrusion including one or more first mounting surfaces disposed above the base portion. The fixture includes a second protrusion including one or more second mounting surfaces disposed above the base portion, and a backside surface that opposes the first protrusion and the second protrusion. The fixture includes a cavity disposed between the first protrusion and the second protrusion, and an aperture extending from the cavity and to the backside surface.

Implementations of the disclosure relate to apparatus and methods for supporting and testing respirators during testing operations. In one aspect, the respirators are tested to determine if the respirators meet a testing standard. In one implementation, a test fixture for supporting respirators during testing operations includes a fixture. The fixture includes a base portion, and a first protrusion including one or more first mounting surfaces disposed above the base portion. The fixture includes a second protrusion including one or more second mounting surfaces disposed above the base portion, and a backside surface that opposes the first protrusion and the second protrusion. The fixture includes a cavity disposed between the first protrusion and the second protrusion, and an aperture extending from the cavity and to the backside surface.

The present disclosure provides a respiratory protection device that includes a valve assembly operable between an open configuration and a closed configuration. In some exemplary embodiments, the respiratory protection device includes an elastomeric seal, and a valve assembly and a breathing air source component are in sealing engagement with the elastomeric seal when the valve assembly is in the closed configuration.

There is provided a computing device comprising: at least one processor; and a memory comprising instructions that, when executed by the at least one processor, cause the at least one processor to: receive first sensor data indicative of a gas characteristic in a sealed space formed by a face of a wearer and a negative pressure reusable respirator; receive second sensor data indicative of a position of at least one valve in the negative pressure reusable respirator; determine comparative data by comparing the first sensor data to the second sensor data; and perform one or more actions in response to the comparative data. There is also provided a system using such computing device.

There is provided a computing device comprising: at least one processor; and a memory comprising instructions that, when executed by the at least one processor, cause the at least one processor to: receive first sensor data indicative of a gas characteristic in a sealed space formed by a face of a wearer and a negative pressure reusable respirator; receive second sensor data indicative of a position of at least one valve in the negative pressure reusable respirator; determine comparative data by comparing the first sensor data to the second sensor data; and perform one or more actions in response to the comparative data. There is also provided a system using such computing device.

A system includes a first and second condensation particle counter, each counter having an inlet port, a growth column, and an optical element for counting particles detected at the respective inlet ports. The counters are configured to include a wick in which the wick is wetted by water. A differential pressure sensor is coupled to the first inlet port and coupled to the second inlet port. The sensor is configured to provide a pressure signal. A processor is coupled to memory and configured to receive the first signal, the second signal, and the pressure signal and generate an output corresponding to a ratio of the first signal and the second signal and correlate the ratio with the pressure signal. A housing is configured to receive the first counter, the second counter, the differential pressure sensor, the processor, and the memory.

A system includes a first and second condensation particle counter, each counter having an inlet port, a growth column, and an optical element for counting particles detected at the respective inlet ports. The counters are configured to include a wick in which the wick is wetted by water. A differential pressure sensor is coupled to the first inlet port and coupled to the second inlet port. The sensor is configured to provide a pressure signal. A processor is coupled to memory and configured to receive the first signal, the second signal, and the pressure signal and generate an output corresponding to a ratio of the first signal and the second signal and correlate the ratio with the pressure signal. A housing is configured to receive the first counter, the second counter, the differential pressure sensor, the processor, and the memory.

A cartridge holder for a respirator, the cartridge holder including a fit-check device with a sealing platen that can be actuated between a first, unsealed position and a second, sealed position in which at least a portion of the sealing platen contacts a major surface of a disposable filter cartridge within the cartridge holder so as to prevent airflow through the disposable filter cartridge.