A pressure sensor for a gas-filled cylinder, which comprises a body from which a connector protrudes for coupling to an opening for filling a gas-filled cylinder with gas, a first through hole which passes through the connector and the body and a second hole which connects the first through hole to a sensor element which is connected electrically to at least one electronic board for processing a signal that can be detected by the sensor element.

According to an example aspect of the present invention, there is provided a MEMS pressure sensor, comprising: a sensor portion comprising a deformable membrane and a first volume, and a valve portion comprising a first output to a first side of the pressure sensor and a second output to a second side of the pressure sensor. The valve portion is operable to close the second output and open the first output to equalize pressure in the first volume with pressure at the first side of the pressure sensor for calibrating the sensor; and close the first output and open the second output to equalize pressure in the first volume with pressure at the second side of the pressure sensor for pressure measurement.

A manifold, a method of making the manifold, and a system for measuring pressure within a fluid flowline, in which the manifold may comprise a manifold body having a first end and a second end. A first fluid conduit and a second fluid conduit may extend through the manifold body and each have an inlet for coupling to a fluid flowline and an outlet for coupling to a pressure transmitter. First and second isolation valve bores may be in fluid communication with the first and second fluid conduits, respectively. A first equalizing bore may be in fluid communication with at least one of the first and second fluid conduits. The inlet openings may be spaced from each other by a first inter-opening distance, and the outlet openings may be spaced from each other by a second inter-opening distance, the first inter-opening distance being different from the second inter-opening distance.

Embodiments of a pressure switch assembly having a quick connect capillary tube are disclosed. One embodiment, among others, has an elongated cylindrical capillary tube for attachment to a refrigeration line so that refrigeration fluid pressure in the refrigeration line can be sensed. A quick connect coupling is connected to the shutoff valve. A shutoff valve is designed to open and close fluid communication between the capillary tube and the quick connect coupling when the quick connect coupling is coupled and decoupled, respectively. A switch body is connected to the quick connect coupling and has first and second electrical connections. The switch body has an internal on/off switch designed to electrically connect and electrically disconnect the first and second electrical connections based upon a predetermined set point of pressure associated with refrigeration fluid that is in communication with the switch body.

Embodiments of a pressure switch assembly having a quick connect capillary tube are disclosed. One embodiment, among others, has an elongated cylindrical capillary tube for attachment to a refrigeration line so that refrigeration fluid pressure in the refrigeration line can be sensed. A quick connect coupling is connected to the shutoff valve. A shutoff valve is designed to open and close fluid communication between the capillary tube and the quick connect coupling when the quick connect coupling is coupled and decoupled, respectively. A switch body is connected to the quick connect coupling and has first and second electrical connections. The switch body has an internal on/off switch designed to electrically connect and electrically disconnect the first and second electrical connections based upon a predetermined set point of pressure associated with refrigeration fluid that is in communication with the switch body.

A refrigeration servicing system includes an apparatus and user equipment in electronic communication with the apparatus. The apparatus includes a body having a first end and a second end, wherein a passage extends within the body from the first end to the second end. A recess is formed within the body at the second end. The body comprises an inlet at the first end configured to directly engage with a portion of the refrigeration system, a conduit in fluid communication with the inlet, and a plunger. The conduit and plunger are each positioned in the passage. The apparatus also includes a housing at least partially positioned in the recess and in fluid communication with the conduit. The housing includes a sensor configured to directly contact the fluid and measure a parameter of the fluid. A method of servicing a refrigeration system is also provided.

A pressure switch includes a diaphragm sensing element disposed within a chamber to sealingly separate switching components from a passage. The diaphragm sensing element includes a convolution section that controls movement of a deflection section between neutral and pressurized positions. The pressure switch includes a reverse stop for limiting travel of the deflection section when exposed to negative pressure. A stationary seal element may be disposed at the reverse stop to further limit exposure of the convolution section of the diaphragm sensing element to negative pressure.

A system and method of analyzing duct pressure within a pipe monitors and detects vacuum pressure of gases, specifically radon levels. The system includes a pressure monitor and a target duct. The pressure monitor preferably includes an alarm light, a speaker, an alarm light, a sensing light, a service light, and a battery alert. The method begins by periodically capturing a plurality of pressure readings inside the target duct with the pressure monitor. Each pressure reading is timestamped with the pressure monitor. Each pressure reading is compared to each situational alert with the pressure monitor to identify at least one matching alert for at least one specific reading. The matching alert is from the plurality of situational alerts. The specific reading is from the plurality of pressure readings. The matching alert is visually and/or audibly outputted with the pressure monitor, if the matching alert is identified for the specific reading.

A measurement module for measuring the differential pressure between a first and second connection point arranged in a transport line for a fluid. The measurement module includes a first connection line and a second connection line, a differential pressure sensor arranged in fluid communication with said first and second connection line, and a valve arranged in fluid communication with said first and second connection line, wherein compared to said valve, said differential pressure sensor is arranged closer to the first and second connection point.

A method of checking a pressure of an agent cylinder that includes coupling a gauge assembly to an outlet of a gauge tool, the gauge assembly having a pressure gauge and a vent valve movable between an open position and a closed position. The method further includes moving the vent valve towards the closed position; attaching a fill adapter defining an inlet of the gauge tool to a valve port of an agent cylinder; and actuating a drive member of the gauge tool in a first direction to move a valve member of the gauge tool from a first position towards a second position to facilitate a fluid flow between the inlet and the outlet of the gauge tool.