Systems, methods and apparatuses for inspecting a tank containing a flammable fluid are provided. A vehicle configured to inspect the tank can include a propeller, a battery, a control unit, an inspection device, and a ranging device. The battery provides power to the propeller, the control unit, the inspection device, and the ranging device. The control unit generates a map of the tank. The control unit determines a first position of the vehicle on the map of the tank. The propeller moves the vehicle through the flammable fluid in the tank. The inspection device determines a quality metric of a portion of the tank. The control unit causes the propeller to move the vehicle from the first position to a second position within the tank. The control unit determines the quality metric for the portion of the tank at the second position within the tank, and stores the quality metric.

Systems, methods and apparatuses for inspecting a tank containing a flammable fluid are provided. The system includes a vehicle having a propeller, a latch mechanism, a pressure switch, and an inspection device. The system includes a control unit in communication with the propeller, the latch mechanism, and the inspection device, and electrically connected to the pressure switch. The control unit powers on responsive to the pressure switch detecting an ambient pressure greater than a minimum threshold. The control unit receives, from the latch mechanism, an indication of a state of the latch mechanism. The control unit determines that the cable used to lower the vehicle into the tank containing the flammable fluid is detached from the vehicle. The control unit commands the propeller to move the vehicle through the flammable fluid. The control unit determines a quality metric of a portion of the tank.

An engine control unit (ECU) includes a housing; a cover sealingly engaged with the housing so as to define an interior space; a circuit board disposed in the interior space; and a fastener coupling together the circuit board, the housing and the cover, the fastener serving to limit an amount of deflection of the housing relative to the housing. The circuit board and the cover are constructed and arranged to define an airflow path from an outer surface of the cover to the interior space. The airflow path allows for a leak test to be performed on the ECU, wherein upon an affirmative determination that results of the leak test shows no leaks in the ECU, sealant seals the airflow path.

There is provided a fit testing method comprising: providing a respirator donned by a wearer; providing a first sensor, where the sensor is configured to monitor a particulate concentration parameter within the respirator, where the first sensor is attached to the respirator such that the weight of the first sensor is supported by the respirator; providing a second sensor configured to monitor a particulate concentration parameter outside the respirator; and providing a reader configured to communicate with the sensor, where the reader is configured to provide a respirator fit parameter based on a comparison of the particulate concentration parameter within the respirator to the particulate concentration parameter outside the respirator.

A system configured to sense a leak in a stuffing box includes a sensing device that has a support supporting an elongated structure that is configured to pivot relative to the support. A container is fixed to a first end of the elongated structure and is suitable for receiving liquid from a leak. The sensing device includes at least one position sensor for detecting a position of the elongated structure. The system is configured such that when empty, the container remains in a raised position, and a second end of the elongated structure, opposite the first end to which the container is fixed, remains in a lowered position. When the system is filled with leaked liquid, the container moves to a lowered position compared to its empty raised position, and the second end of the elongated structure moves to a relatively raised position compared to its empty lowered position.

A refrigerant leak detection system for a heating, ventilation, and air conditioning (HVAC) system includes a vessel configured to receive an air sample. The refrigerant leak detection system includes a cooling device configured to cool the vessel and a liquid detection device configured to detect liquid in the vessel. The refrigerant leak detection system further includes an actuator configured to actuate a transfer mechanism to collect the air sample in the vessel.

A monitoring device for monitoring a fabrication process in a fabrication system. The monitored fabrication system includes a process chamber and a plurality of flow components. A quartz crystal microbalance (QCM) sensor monitors one flow component of the plurality of flow components of the fabrication system and is configured for exposure to a process chemistry in the one flow component during the fabrication process. A controller measures resonance frequency shifts of the QCM sensor due to interactions between the QCM sensor and the process chemistry in the one flow component during the fabrication process. The controller determines a parameter of the fabrication process in the process chamber as a function of the measured resonance frequency shifts of the QCM sensor within the one flow component.

An endoscope leak test connector includes: a rotating body configured to cause a ventilation member to project from a leak test pipe sleeve by rotating in a positive direction and cause the ventilation member to be buried into the leak test pipe sleeve by rotating in a negative direction; a gas inlet configured to be connected with a gas supply source; a facing member configured to face the ventilation member projecting from the leak test pipe sleeve; a gas outlet that is open on the facing member; and a seal portion configured to seal the gas outlet and the ventilation member so that the gas outlet and the ventilation member liquid-tightly communicate with each other.

A leak detection and mitigation system includes a gas flow path extending from a gas outlet of a fuel degassing device and an orifice in the gas flow path. A sensor is positioned in the gas flow path upstream from the orifice. The sensor is configured to detect a fuel leak into the gas flow path. A method for leak detection and mitigation in a fuel degassing system includes removing gasses from a fuel stream with a fuel degassing device. The method includes directing gasses removed from the fuel stream through a gas flow path extending from a gas outlet of the fuel degassing device. An orifice is positioned in the gas flow path. The method includes detecting a leak from the fuel stream into the gas flow path by measuring a characteristic in the gas flow path upstream from the orifice with a sensor.

A method for detecting a water ingress into an interior of a housing, which is sealed against the surroundings, including the following steps: detecting a temperature of the air in the interior; detecting a relative air humidity in the interior; and detecting a water ingress as a function of the detected temperature and of the detected relative air humidity.