1578 results about "Intrinsic safety" patented technology

A connector (100) having multiple contacts (102) includes a supply contact (104), a ground contact (106) and at least one other contact (108) for providing attach / detach detection to an accessory or accessory connector. The supply and ground contacts (104, 106) are longer than the detect contact (108) so that power is connected prior to any of the other contacts and power is removed after any of the other contacts are detached. Logical control circuitry (318) interfaces with the connector (100) to minimize sparks upon detachment from the accessory (304).

An adapter for coupling to a process control transmitter of the type used to monitor a process variable in an industrial process includes a first connection configured to couple to a first side of a two wire process control loop, a second connection configured to couple to a second side of the two wire process control loop and in series with a first connection to a process control transmitter, and a third connection configured to couple to a second connection of the process control transmitter. Wireless communication circuitry is coupled to at least the third connection and is configured to provide wireless communication for the process control transmitter. Intrinsic safety circuitry coupled to at least one of the first, second and third connections is configured to limit transfer of electrical energy to a value which is less than an intrinsic safety value.

The invention discloses an intrinsically safe inerting protection method and an intrinsically safe inerting protection device for an oil storage tank, relates to a method and a device for active fire and explosion prevention of the oil storage tank, and aims to solve the problem of fire and explosion prevention of the oil storage tank. The method comprises the following steps: a, performing inerting on each oil tank in sequence to ensure that each oil tank achieves an inexplosive condition, namely, the oxygen concentration of gas in the tank is lower than 10 percent; b, detecting the pressure of a pipe network for supplying inert gas to the oil tank, and supplying the inert gas to the pipe network and inputting the inert gas to the oil tank through the pipe network if the pressure is lower than a set lower limit value; c, detecting the pressure of the pipe network for supplying the inert gas to the oil tank, emitting the inert gas in the pipe network if the pressure exceeds a set upper limit value; and d, detecting the oxygen concentration in the pipe network for supplying the inert gas to the oil tank, and repeating the step a if the concentration exceeds the set upper limit value. The device comprises a buffer device, a breathing pipe network, a first pressure transmitter, a second pressure transmitter, an online oxygen analyzer and an electric control device.

The invention discloses an ultra wide band location method and an ultra band location system in a coal mine well. The method is a banded cell two-step locating method and comprises the following steps of: dividing a plurality of continuously-overlapped banded locating service cells along a roadway; calculating nominal intervals of all reference points; filtering according to received signal strength (RSS) data by an object; measuring and calculating an area coverage in which the object is located; and obtaining the accurate position of the object by a hybrid location method based on cumulative average weighted processing. The system comprises an upper-layer terminal, a data locating server, a ground monitoring terminal, a switchboard, an intrinsically safe gateway, an intrinsically safe wireless relay, an intrinsically safe reference point terminal and an intrinsically safe location terminal. The ultra wide band location method and the ultra wide band location system have strong anti-reference capability, accurate location, a simple structure of system equipment and low power consumption, are more suitable for the roadway working environment, and meet the requirements of the coal mine well for specific operating environment and safety demand.

A coal mine underground safety comprehensive monitoring system based on fiber grating sensors and belongs to a coal mine underground safety monitoring system. The system comprises an aboveground part and an underground part; the aboveground part comprises a static fiber grating demodulator, a computer data processing system, a printer, a server and a client; the underground part comprises an optical switch array, a working face safety monitoring subsystem and a laneway safety monitoring subsystem; each of the two monitoring subsystems at least comprises a monitoring base station; each monitoring base station at least comprises a survey station; each survey station is corresponding to one group of fiber grating sensors; the advantage is that the system adopts multiple survey stations to perform underground multi-parameter monitoring, integrates the fiber grating sensors, adopts all-optical survey and optical fibers for signal transmission, is intrinsically safe, has high anti-electromagnetic interference capability and a good monitoring effect, realizes real-time continuous long-term on-line monitoring and the sharing of data in an entire mining area to better guide the safety production of a coal mine, can effectively reduce safety accidents of the coal mine and realizes safe and efficient production of the coal mine.

An improved intrinsically safe field maintenance tool is provided. The tool is operable with process communication loops in accordance with a plurality of process industry standard protocols. Aspects of the invention include hardware features such as an infrared port; removable memory module; and an expansion memory module. Additional aspects of the invention include protocol-specific diagnostic methods executable with the improved intrinsically safe field maintenance tool.

A multi-channel, reconfigurable fiber-coupled Raman instrument uses fiber optic switches for laser and calibration light routing to facilitate automated calibration, diagnosis and operational safety. The system allows wavelength axis calibration on all channels; laser wavelength calibration (including multiple and / or backup laser options); fiber coupling optimization; fault detection / diagnosis; and CCD camera binning setup. In the preferred embodiment, dedicated calibration channels surround data channels on a 2-dimensional CCD dispersed slit image implemented using a unique cabling architecture. This “over / under” calibration interpolation approach facilitates quasi-simultaneous or sequential calibration / data acquisitions. CCD binning between sequential calibration and data acquisitions enables higher density multi-channel operation with tilted images based upon a multiplexed grating configuration. A diamond sample is used as a Raman shift reference for laser calibration, preferably in the form of a small disc sampled with an edge-illuminating probe using two unfiltered fibers. Detection of beam transmitted through the diamond reference is also used to optimize laser coupling efficiency with motion servos. An “intrinsically safe” laser interlock circuit also serves as current source for probe head “laser on” diode indicator. The integrity of key components is monitored through strategically placed photodiodes positioned, for example, at fiber bends to detect light leakage from bent fiber as verification of commanded laser path through fiber switches and at neon and halogen lamp locations to verify lamp operation. The optical switches used for calibration may also be configured for use as a laser shutter.

A radar level gauge using electromagnetic waves for determining a process variable of a product in a tank, comprising timing circuitry adapted to provide timing control of a transceiver, and a communication interface arranged to receive power in an intrinsically safe manner and to connect the radar level gauge externally thereof. The RLG further comprises an isolation interface arranged to galvanically isolate the transceiver from the timing circuitry and the communication interface, the isolation interface being arranged to transfer power and timing control from the timing circuitry and the communication interface to the transceiver circuitry.According to this design, the galvanic isolation splits the radar level gauge system internally into two circuits, with no galvanic connection there between. An advantage is that this design eliminates any potential ground loops between the transceiver and the communication interface.

A system for measuring at least one parameter is provided. The system includes a control logic arrangement powered by a power source, and an intrinsically safe barrier operatively connected to the control logic arrangement, and also powered by the same power source. The intrinsically safe barrier is adapted to be operatively connected to at least one sensor which is also powered by the same power source. The sensor is configured to communicate data representing a parameter to the control logic arrangement via the intrinsically safe barrier. In one embodiment, the control logic arrangement, the intrinsically safe barrier and the sensor are galvonically isolated from external components and / or provided in one enclosure.

A wireless tank monitoring system for remotely monitoring a plurality of storage tanks is provided. This tank monitoring system utilizes wireless communication from individual tank level monitors to a single SatComm Gateway. The SatComm Gateway then utilizes a low-Earth Orbit satellite constellation to transmit information to a central data collection center. The data collection center then provides access to this information to clients. These clients also have the capability of controlling individual monitors via the bi-directional communications path through the satellite link to the SatComm Gateway to the individual monitors. The SatComm Gateway packages the information from each of the monitors to optimize the communications through the satellite link to decrease the cost of transmission. Intrinsic safety is provided by each of the individual tank level monitors.

The invention relates to a microprocessor system for executing software modules, at least some of which are security critical, within the scope of controlling functions or tasks assigned to the software modules, comprising an intrinsically safe microprocessor module having at least two microprocessor cores. At least one further intrinsically safe microprocessor module having at least two microprocessor cores is provided. At least two microprocessor modules are connected via a bus system, at least two software modules are provided which execute functions, at least some of which overlap, the software modules having at least partially overlapping functions are distributed on a microprocessor module or n at least two microprocessor modules, and means for comparing or arbitrating events generated with the software modules for the identical functions are provided in order to detect software or hardware faults.

A system and method for providing an intrinsically safe (IS) galvanically isolated barrier device. An IS barrier device provides IS galvanic isolation between a non-IS system and an IS system using a two-stage approach. In the first stage, a non-galvanically isolated IS barrier limits energy of electrical transmissions received from the non-IS system to convert such electrical transmissions into IS transmissions. In the second stage, the IS transmissions are transmitted through a galvanic isolator to the IS system to galvanically isolate the IS system from the non-IS system. A digital monolithic isolator cannot be IS certified to be the single bridge between IS and non-IS systems, however, it can be used in a certifiable fashion to isolate between IS systems. When used in conjunction with a non-galvanic IS barrier that is capable meeting the IS certification as non-IS to IS barrier, a digital monolithic isolator can be used to implement the galvanic isolator such that high speed, low cost galvanic isolation is possible. Such a galvanically isolated barrier device can be used to implement an IS galvanically isolated high speed communication bus for sample system control.

A suspension system for an aircraft powerplant attached to an aircraft frame and having a housing. The suspension system includes a spindle mounted in a spindle support rigidly joined to the aircraft frame, a bearing cage affixed to the housing and having a bearing positioned therein, a pair of suspension arms connected to the spindle support, and a pair of lateral linkrods configured to link the housing and the suspension arms. The side surfaces of the bearing cage and the suspension arms define a clearance therebetween concentric to the Y-axis. The bearing cage is configurable along the spindle such that the bearing cage is limited to displacement relative to the longitude of the spindle while maintaining contact with the spindle.

An endoscope apparatus, includes: an explosion-proof unit that has an image pickup device that outputs photographed video images as video image signals; and an A / D converter that converts the video image signals into digitalized image signals; a control unit that controls the explosion-proof unit; and an energy limiting circuit that is provided at the control unit and that limits electrical energy of digital signals to satisfy intrinsic safety when sending and receiving of the digital signals, wherein the explosion-proof unit is connected to the control unit via the energy limiting circuit with a signal line.

System for monitoring a floating roof of a tank containing a liquid, wherein the system determines a local status of the floating roof in spaced apart sensing element locations. In a hazardous or potentially hazardous environment, there is an on-roof subsystem including a sensing element in each sensing element location, intrinsically safe measuring circuitry coupled a sensing elements and arranged for determining said local status, intrinsically safe radio communication on-roof circuitry coupled for communicating externally of the on-roof subsystem the local, an intrinsically safe power supply circuitry connected to an intrinsically safe and interchangeable energy storage unit for powering the on-roof subsystem. The system further includes monitoring circuitry for receiving the indication of local status and for determining an overall monitored status of said floating and further radio communication circuitry. The on-roof subsystem is wireless in its power supply and communication.

The invention discloses a trackless rubber-tyred vehicle intelligent onboard system, a downhole vehicle dispatching system and a control method. The trackless rubber-tyred vehicle intelligent onboardsystem is characterized in that a trackless rubber-tyred vehicle is equipped with an explosion-proof control cabinet which is divided into a main cavity, a power supply cavity and a wiring cavity; themain cavity is provided therein with a power management module, an information exchange module, an isolation module, and inertial navigation module, a data acquisition and preprocessing module, a positioning and environment modeling module and a planning control module; an intrinsic safety sensing module, an explosion-proof sensing module and a bottom-layer controller are arranged outside the explosion-proof control cabinet. The downhole vehicle dispatching system includes wireless sensor network anchor nodes disposed at different positions of a roadway, a positioning device carried by a downhole person, a downhole monitoring camera, and a dispatching system server. Based on the trackless rubber-tyred vehicle intelligent onboard system and the downhole vehicle dispatching system, an operation control method of the trackless rubber-tyred vehicle is constructed. The invention realizes the autonomous driving and intelligent dispatching of the trackless rubber-tyred vehicle, and improvesthe safety and high efficiency of the auxiliary transportation.

An intrinsically safe video inspection system intended for use in a Class I, Zone 0 area is capable of visually surveying hazardous area locations; where the potential for fire or explosion exists because of gases, dust, or easily ignitable fibers in the atmosphere. The intrinsically safe camera of the present invention has the distinct ability to be used all areas that require increased safety and works in various hazardous environments, allowing users the ability to remotely view and inspect various mines, silos, and storage tanks. The inspection system includes a low power, high 3.2 megapixel resolution camera with digital zoom capability that allows for the close inspection and examination and utilizes an LED fiber light pipe for illumination needs. The video inspection system of the present invention provides for the illumination in various cavity sizes, while reducing the risk of unintended accidents.

The invention relates to an underground high-precision navigation map establishment system and an establishment method. On the basis of the system comprising an underground geographic information system, an intrinsically safe modeling device and each intrinsically safe ultra wide band (UWB) anchor node which is set in each underground tunnel, the establishment method is further designed and introduced. According to the whole design, an underground high-precision navigation map can be rapidly established, environment model functions can be dynamically updated, a modeling result is input into the underground geographic information system, and a multilayer map model capable of providing auxiliary positioning and route planning for automatic movement of vehicles underground is established.

In a circuit for safe forwarding of a physical or technical variable between at least two systems in communication with one another, which variable is represented by the value of a loop current (Is), which is adjusted by a control unit (11) by means of a current output circuit (13) in a current loop (20, 60), the current output circuit (13) has at least two parallel-connected final control elements (131, 132), controllable by the control circuit (11), as current sources for mutually independent adjustment of a value of the loop current (Is). The final control elements (131, 132) are in series with at least two likewise series-connected measurement resistors (133a, 133b). The voltage, proportional to the loop current (Is), dropping via at least one but not all of the at least two measurement resistors is fed back to the control unit (11), which compares the value of this voltage with the corresponding value of the loop current, which value is specified to at least one of the final control elements, and in the event of deviations, via a predeterminable threshold, allocates an fault value corresponding to the NAMUR recommendation NE043 to the loop current via the first final control element (131), and in the case of failure of the first final control element (131) via the second final control element (132). A monitoring circuit (17) is provided, which in the event of failure of the control unit (11) allocates an fault value that likewise corresponds to the NAMUR recommendation NE043 to the loop current via the second final control element (132). The invention, compared to embodiments based on the principle of redundance, thus makes it possible to disclose a more-favorable embodiment for monitoring and signalling faults, which makes do with only one current path. The circuit may be designed in that way. By additional wiring, the demands in terms of explosion protection by intrinsic safety, functional safety (up to at least SIL 2), HART communication, and a standardized interface in accordance with NAMUR recommendation NE43 with an upper fault current (greater than 21 mA) and a lower fault current (less than 3.6 mA) and an active mode (current source) and passive mode (current sink) can be met at the same time.

The invention discloses an embedded mine data substation which is an underground data acquisition and control device used in a coal mine safe production monitoring system. The substation comprises an intrinsic safety power source, an ARM controller mainboard, a CAN bus communication board, a display drive board, a liquid crystal display screen and an explosion-resistant enclosure. Real-time data of various sensors of analog quantity, switching value and cumulant, which are articulated with the mine data substation, is acquired in real time through a downlink RS485 bus, and the real-time data is displayed by the liquid crystal display screen; cutting off control is automatically performed to articulated output equipment by means of set control logic according to the change of the real-time data; the data is transmitted to a ground monitoring host computer through an uplink CAN bus interface and network monitoring is performed. The substation is suitable for underground environment of a coal mine, has functions of intelligent alarm, cutting off control and automatic network deployment, is an important component element in a masterless coal mine safe production monitoring system and can reduce the occurrence probability of coal mine safety accidents in time.

An improved intrinsically safe field maintenance tool is provided. The tool is operable with process communication loops in accordance with a plurality of process industry standard protocols. Aspects of the invention include hardware features such as an infrared port; removable memory module; and an expansion memory module. Additional aspects of the invention include protocol-specific diagnostic methods executable with the improved intrinsically safe field maintenance tool.

A non-intrinsically safely supplied measurement device (1) with a connecting device (3) having an “increased safety” type of protection for connecting the measurement device (1) to a feed connection (2) in order to supply the measurement device (1) with electricity, an electronic device (4) which contains electronic components of the measurement device (1), a display device (8), a sensor (7) made with “increased safety” or “intrinsic safety” type of protection, and an output circuit (9) that is without at least the “intrinsic safety” type of protection. The electronic device (4) has an “encapsulation” type of protection, the display device (8) has an “intrinsic safety” type of protection and the display device (8), the sensor (7) and the output circuit (9) are connected to the electronic device (4) via connections having an “increased safety” type of protection.

A coal mine underground monitoring and staff locating system is a comprehensive operation system combining underground staff attendance, track location, after-disaster first aid, and daily management, and is the most advanced, stable and professional operation system; the system comprises a ground computer control centre, a transmission interface, a tag card, a foundational base station, a locating base station, a blast-proof and intrinsic safety type multi-way power box, and other matching equipment. The received staff condition signal is sent to the ground transmission interface through the locating base station by using a radio emission technique and sent to a host to process; the host executes judging and alarming, data counting and storage, display, man-machine conversation, staff line monitoring, and control and printing for the received monitoring signal. An alarm device is set in the special area of the coal mine such as a key area and a limited area so that the effective information is supplied to the after-disaster first aid and that the casualties in the coal mining accidents are also reduced.

The invention relates to the technical field of high-precision and low-consumption radar distance measurement, comprising a Hart module, a measuring module and a measuring line. The distance measurement of the system is based on TDR principle, adopting double DDS to generate two-way precise timing clock and realizing amplified time proportion of echo pulse, with a distance measuring precision of 5 mm; ultra wideband narrow pulse signal realizes high resolution of distance measurement, with a resolution of 1 mm; the proposal for working at intervals of the system greatly reduces power consumption which is 40 mW, in accordance with industrial standard of intrinsic safety.

An intrinsically safe LED display device with an array of LED circuit cells is provided. Each cell comprises a LED or a group of LEDs, which are individually made intrinsically safe in a conventional way, by limiting a dissipated power through the LED circuit cell by means of a resistor or group of resistors in series with the LED or group of LEDs. In addition a switching type PTCs with a switching temperature between 80 and 125 degrees centigrade are added in each cell, in series with the resistors or group of resistors of the LED circuit cells respectively, in thermal contact with the resistor or group of resistors of the LED circuit cell. In this way intrinsic safety is provided for mutual heating of adjoining LED circuit cells wherein the LEDs or groups of LEDs are short circuited.

The invention discloses an LED visible light wireless communication system for a mine, which comprises a signal I / O processing part, a receiving end part, an emitting end part, a main control chip set and a software control part, wherein hardware equipment comprises an LED mine lamp and an LED head lamp. In the invention, the communication system can avoid that the communication reliability is influenced because an optical detector is easily polluted due to large dust in the mine for the traditional LED visible light communication technology by adopting a communication mode of combining a UWB (Ultra-wide Band) wireless communication technology with an LED visible light communication technology on the basis of the design scheme of a programmable super-large-scale integration circuit chip, and can fully utilize the advantages of green illumination of LED visible light, wide coverage range, large transmission capacity and high modulation rate. The LED visible light wireless communication system is extremely low in power consumption, has the power consumption of hundreds mu W to tens mW which is only 1 / 10-1 / 100 that of the traditional radio station during high-speed communication, and is more easily realized in intrinsic safety design suitable for the mine.

An apparatus for the remote measurement, control, and supervision, via a wired or wireless network connection, of the flow of gas, allowing fully opening or closing a valve in case of an emergency or for administrative purposes. The apparatus also provides for flow pressure, barometric pressure, and a temperature compensated gas flow meter. The apparatus obtains the number of revolutions of a rotor which delivers a fixed amount of gas per revolution and compensates for gas bypassing the rotor. The apparatus is self powered by the energy produced by an electric generator coupled to the flow measurement rotor. The surplus energy not used by the electronic components in measuring and reporting is stored for the operation of the rotary control valve. The apparatus is housed in a planar base plate that allows servicing from one side of the system. The apparatus uses an energy storage management system for the controlled charging and use of the apparatus in an intrinsically safe manner.