KR100501033B1 - Pressure housing for in-water pressure based systems - Google Patents

Abstract

The present invention avoids the accidental data offloading in pressure housings and wet, dusty field stations for hydraulic-based systems and the ingress of moisture, dust or any suspended particles in the air during battery replacement. Improving the life of transducers and electronics in underwater systems by keeping moisture free and maintaining a clean environment; The use of a novel device improves the convenience of opening and closing of the pressure housing, thereby avoiding the use of conventionally adopted snugly protruding and corrosive fasteners such as screws, bolts or clamps; The present invention relates to a method for preventing the chemical corrosion caused by brine and suppressing biocontamination near the pressure inlet by performing a reliable transfer of hydraulic pressure to the pressure port of the transducer while minimizing errors resulting from the dynamic pressure effect.

Description

PRESSURE HOUSING FOR IN-WATER PRESSURE BASED SYSTEMS

The present invention relates to a pressure housing for a hydraulic pressure based system. More specifically, the present invention is directed to (1) avoiding accidental data offloading at wet and dusty field stations and avoiding the ingress of moisture, dust or any floating particles in the air during battery replacement. Improving lifespan of transducers and electronics in underwater systems by keeping them free and maintaining a clean environment; (2) a method of improving the convenience of opening and closing of the pressure housing by the use of a novel device, thereby avoiding the use of conventionally adopted jamming and prone corrosion fixing devices such as screws, bolts or clamps; And (3) a method of performing reliable delivery of hydraulic pressure to the pressure port of the transducer while minimizing errors arising from the dynamic pressure effect to prevent chemical corrosion by salt water and to suppress biocontamination near the pressure inlet. will be.

Hydraulic pressure based systems known to date [VB Peshwe, SG Diwan, A. Joseph, and E. Desa, "Wave and Tide Gauge", Indian Journal of Marine Sciences , Vol. 9, pp.73-76 (1980) ] Discloses wave and tide gauges where underwater electronics and pressure sensors are placed and fixed on a circular brass plate fitted in a brass cylinder. O-rings are used to seal the underwater device, which is mounted on the steel base. All steel components are nickel plated and brass components are coated with paint. The pressure sensitive metal diaphragm of the pressure transducer is protected against chemical corrosion by the use of an oil filled neoprene nipple attached to a stainless steel connector located on the plane of the removable end plate and hydraulically connected to the pressure port. have. The end plate is fixed to the flange of the cylindrical housing by the use of four bolts, washers and nuts which are arranged radially opposite. It is a drawback of this device that accidental damage to the neoprene rubber nipples caused by fish bites results in the loss of oil protecting the pressure ports of the transducer against chemical corrosion. Another drawback is the protruding bolts and nuts which give the housing an aesthetic appearance.

Another system [A. Joseph and ES Desa, "A Microprocessor-Based Tide Measuring System", Journal of Physics, E. Scientific Instruments , Vol. 17, pp. 1135-1138 (1984)]. Disclosed is a tide measurement system comprising a cylindrical hydraulic housing made of brass. The pressure transducer is arranged on a circular brass base plate of the housing and the pressure inlet is exposed to sea water through an orifice protected by an O-ring on the base plate. The entire housing is sealed with another larger O-ring disposed between the cylindrical housing and its base plate. The base plate is mounted to a circular flange of a cylindrical housing using six units of stainless bolts, washers and nuts. The drawback of this method of sealing the pressure housing is that special care must be taken to simultaneously tighten the radially opposed bolts, and if this fails, the O-ring will deform unevenly beyond its elastic limit, causing the pressure housing to fail. It causes the possibility of leakage and damage of the converter. Another drawback observed is that underwater connectors used for the transfer of data to external readers were subject to chemical corrosion after prolonged immersion in seawater. The hydraulic coupling device, coupled with the parasitic quartz pressure transducer, is a silicone-oil having a diameter of ˜1 mm and a length of ˜200 mm, with one end attached to the pressure port of the transducer and the other end connected to the end cap of the transducer housing. It consists of a filled flexible plastic capillary. A drawback observed in this hydraulic coupling device in research in the field is the slow leakage of oil over long periods of time.

Another system [A. Joseph and E. Desa, "An Evaluation of Free- and Fixed- Vane Flow Meters with Curved- and Flat-Bladed Savonius Rotors", Journal of Atmospheric and Oceanic Technology, American Meteorological Society , Vol. 11, No. 2, pp. 525-533 (1994) discloses two types of depth indicators with a tachometer that use underwater pressure housings to position sensors and electronic component printed circuit boards. Within these equipment the pressure housing is closed with an end plate assembly which forms part of the aid for the current sensor. The pressure sensor used to estimate the depth of water is arranged on the horizontal step of the pressure housing. The pressure housing is attached to the end plate assembly using four conformal bolts. Two shortcomings found in this device include (1) protrusion of the anchoring bolt and (2) ["Evaluation and performance enhancement of a pressure transducer under flows, waves, and a combination of flows and waves, Journal of Atmospheric and Oceanic Technology, American Meteorological Society , Vol. 17, No. 3, pp.357-365 (2000), as discussed by A. Joseph, JAE Desa, P. Foden, K. Taylor, J. McKeown, and E. Desa. It is a protrusion of a pressure inlet that is vulnerable to the deterioration of pressure measurement accuracy resulting from the same flow, wave, or adverse effects of a combination of flow and wave.

In another form of hydraulic apparatus for the measurement of flow rate, water level and many other marine variables, Aanderaa Instruments (Norway) has a removable end cap at one end and an end cap fixed at the other end, and Possible end caps use cylindrical metal housings that are adapted to be secured using two metal clamps hooked into slots machined on the radially opposite locations on the outer circumference of the end cap and cylindrical housing. In this device, the pressure inlet of the pressure transducer protrudes outward, and thus has a pressure measurement error caused by the movement of various seawaters in the vicinity thereof.

The principle drawbacks associated with all conventional submersible pressure housings that are dried to metal and whose metal end caps are secured using devices such as metal screws, bolts or clamps are subject to chemical corrosion after prolonged exposure to seawater. Opening of the end plates is generally difficult. In addition, the presence of such protruding devices degrades the aesthetic appearance of the pressure housing.

1 shows a conventional method of the prior art used in a hydraulic pressure based system,

2 is a cross-sectional view of a novel pressure housing for a hydraulic pressure based system of the present invention;

3 is a cross-sectional view of a mounting apparatus used in a novel pressure housing for a hydraulic pressure based system of the present invention;

4 shows a time series sea level record measured by a pressure transducer with electronics incorporated in the pressure housing of the present invention;

5 shows a time series water temperature record measured by an electronic device with a temperature transducer incorporated in a pressure housing of the present invention;

FIG. 6 shows time series battery voltage recording recorded by a data recorder incorporated within the pressure housing of the present invention. FIG.

The main object of the present invention is to keep moisture free and clean from surroundings by avoiding accidental data offloading in a wet and dusty field station and avoiding the ingress of moisture, dust or any floating particles in the air during battery replacement. Maintaining the environment improves the lifetime of transducers and electronics in underwater systems.

Another object of the present invention is to improve the convenience of opening and closing of the pressure housing by the use of a novel device, thereby avoiding the use of conventionally adopted snugly protruding and corrosive fasteners such as screws, bolts or clamps. .

Another object of the present invention is to provide reliable transmission of hydraulic pressure to the pressure port of the transducer while minimizing errors resulting from dynamic pressure effects, to prevent chemical corrosion by salt water and to suppress biocontamination near the pressure inlet. will be.

The novel pressure housing for a hydraulic pressure based system of the present invention provides the following.

(1) Avoiding accidental data offloading at moist and dusty field stations and entry of moisture, dust or any floating particles in the air during battery replacement to keep moisture free and to keep the environment clean. Maintains the lifetime of transducers and electronics in underwater systems. The system of the present invention provides two independent compartments, a transducer attachment electronics (not disturbed) compartment adapted to enclose the transducer and the electronics, and a battery attachment connector compartment adapted to enclose the battery and the computer interface connector. In a clean and dry environment, it avoids the ingress of moisture, dust or any particles in the air during accidental data offloading and battery replacement, usually at remote field stations in dusty and damp coastal environments. Provides a method of encapsulating transducers and electronic devices sensitive to the environment. In addition, the two compartments are cut from a single solid nonmetallic material for beauty, light weight, and corrosion protection in marine environments.

(2) The use of a novel device improves the convenience of opening and closing of the pressure housing, thereby avoiding the use of conventionally adopted stray protruding and corrosive fasteners such as screws, bolts or clamps. The system of the present invention provides a threaded nonmetallic placement ring to place the seal plate of the transducer attachment electronics compartment in its defined position. The system of the present invention also provides a threaded cylindrical portion that is cut on the top center of the nonmetallic seal plate of the battery compartment connector compartment, the cylindrical portion having a simple mechanism that facilitates free opening of the seal plate. Function as. The seal plate, which has a threaded central male portion, is simply pushed into place and seated on a circular stepped portion cut into the inner surface of the cylindrical pressure housing. A threaded non-metal end cap (with a female portion for use in opening) positioned above the seal plate is disposed in place. Threaded non-metallic placement rings keep the seal plate and end cap in position. In addition, the system of the present invention primarily attaches the battery by unscrewing the placement ring, opening the end cap, coupling the female portion of the end cap with the male portion of the seal plate and then pulling it out easily and comfortably. Allows easy opening of the connector compartment.

(3) By using a compact, non-corrosive, biocontamination-resistant hydraulic coupling device, reliable transmission of water pressure to the pressure port of the transducer can be carried out, while minimizing errors resulting from the dynamic pressure effect. Prevents chemical corrosion and suppresses biocontamination near pressure inlets. Accordingly, the system of the present invention provides a hydraulic coupling device (HCD) that basically includes a male component and a female component. Copper cylindrical rods machined in the form of countersunk screws and second copper cylindrical rods with internal and external threads constitute the female and male components of the HCD, respectively. This coupling device together with the integral part of the pressure transducer forms the end cap of the transducer attachment electronics of the pressure housing. These components together with the viscous oil deposited in the space between the front end of the pressure transducer and the countersunk screw form the HCD of the system of the invention. The narrow gap between the female and male components of the HCD provides a necessary path for the transmission of seawater pressure through the oil medium to the pressure port of the transducer, hydraulically connecting the pressure transducer to the surrounding brine medium. do. The copper material of HCD is described in "The advantages and limitations of using copper material in marine aquaculture", Proc. IEEE Oceans '75 , pp. 444-453 (1975)], due to its ability to resist marine product adhesion, as reported by JE Huguenin and FJ Ansuini, prolonged exposure to seawater media in the light-receiving layer. Eliminate the possibility of closing the pressure inlet by biocontamination during The viscous oil present in the HCD prevents physical contact with the seawater of the decompression element, while at the same time transferring the seawater pressure to the transducer (ie hydraulically connected). The HCD provided in the system of the present invention allows for easy replacement of the oil by unscrewing its male component from its slot, flowing the oil into the pressure port and then screwing it back, thereby allowing air bubbles in the oil reservoir. Or other hollow lung spaces to be trapped. The HCD provided in the system of the present invention is suitable for incorporation into the end cap of the pressure housing. The time constant of the helical oil path provides a certain level of mechanical filtration of the vibrations of the high frequency present in the primary wind-induced gravitational waves and secondly in pressure measurements caused by the movement of ships and boats. Since the compact and flat side of the HCD provided in the system of the present invention is maintained at the same height as the flat end plate of the pressure housing, the inaccuracy of the kinematically induced measurements resulting from the flow, wave or combination of flow and wave [ "Evaluation and performance enhancement of a pressure transducer under flows, waves, and a combination of flows and waves", Journal of Atmospheric and Oceanic Technology, American Meteorological Society , Vol. 17, No. 3, pp.357-365 (2000) ], As reported by A. Joseph, JAE Desa, P. Foden, K. Taylor, J. McKeown, and E. Desa. The simpler design of the HCD incorporated into the present invention of a novel pressure housing for a hydraulic pressure based system allows for an easier and more economically feasible structure which is not known until now. Accordingly, the hydraulic coupling device incorporated into the present invention of a novel pressure housing for hydraulic-based systems is described in "Deep sea tide gauge with optical readout of Bourdon tube rotations", Nature , Vol. 226, pp. 935- 937 (1970) disclosed by JH Filloux; Disclosed by G. Dietrich, K. Kalle, W. Kraus, and G. Siedler in Measurement of water level variations, General Oceanography; An Introduction, pp. 128-131 (1980); coupling device for use with in-water pressure based systems ", as disclosed by E. Desa, A. Joseph, D. Rodrigues, VN Chodankar, and S. Tengali in pending Indian patent application No. 487 / DEL / 99. Is better than the hydraulic coupling device known to date.

The present invention thus comprises a housing 12 having two compartments 13 and 14, two compartments separated from each other by a circular disk 15, one of which being a transducer 13 and an electronic device. A housing 12, the remaining compartment 14 being provided to place an electrical connector connecting to a computer or any other device that enables initialization and data offloading of the battery pack and electronics; An electrical connector 16 having an O-ring 17 and arranged axially in the center of the circular disk 15 to electrically connect the two compartments 13, 14; A seal plate (18) having a pair of side O-rings (19, 20) for sealing the electronics compartment (13) with the transducer; Retainer rings 24 for securing the seal plate 18 in its predetermined position; Another seal plate 21 having a pair of side O-rings 22 and 23 for waterproofing the connector compartment 14 with the battery pack; Retainer rings 25 for positioning the seal plate 21 in its predetermined position; A fixing ring 26 for fixing the retainer ring 25; A hydraulic coupling device consisting essentially of a male component (28) and a male component machined in the form of a countersunk screw (29), wherein the female component and the male component are accompanied by an integral part of the pressure transducer (30). Forming an end cap 18 of the transducer compartment electronics 13 of the pressure housing 12, the female component 28 and the male component 29, the front end of the pressure transducer and the counter head. The viscous oil laminated in the space provided between the screws and the narrow gap between the threads of the male and female components of the hydraulic coupling device provide the necessary path for the transfer of sea water pressure to the pressure port of the transducer. A hydraulic coupling device adapted to hydraulically connect the pressure transducer to the surrounding brine medium; A hollow cylindrical transducer retainer 31 screwed on the inner surface of the axial recess on the seal plate 18 to provide mechanical stability to the pressure transducer 30; Screwed on the outer surface of the step on seal plate 18 to mount two clamps 33 which serve as means for mounting a printed circuit board (pcb) 34 using four similar screws 35. Another hollow cylinder 32; Hollow spaces cut from metal bolts 36 waterproofed using O-rings 37 to place temperature sensors 38 for measurement of water temperature; A battery pack 39 for supplying power to circuits and sensors; And computer interface means 40 for initialization and data offloading.

In one embodiment of the invention, the body of the pressure housing 12, seal plates 18, 21, and retaining rings 24, 25, 26 are all chemically induced during prolonged immersion in seawater. Made from nonmetallic materials to prevent corrosion or contaminated underwater bodies.

In another embodiment of the present invention, the retainer ring 25 for positioning the seal plate 21 in its predetermined position, and the retaining ring 26 for securing the pressure housing are projected, which are normally used. Avoid the necessity of using bolts, nuts, or clamps.

In another embodiment of the present invention, the hydraulic coupling device has a female component 28 and a male component 29, wherein both the female component 28 and the male component 29 are pressure inlets. It is made from a material selected from the group consisting of copper, copper alloys and similar alternative materials which can prevent biocontamination in the vicinity of

In another embodiment of the present invention, the hydraulic coupling device is mounted on a flat seal plate of the pressure housing to reduce the kinetic induced pressure measurement inaccuracies arising from the effects of flow, waves or a combination of flow and waves. It has the flat end part arrange | positioned at the same height as it.

In another embodiment of the present invention, the cylindrical collar 43 of the mounting device comprises two buffered nonmetal collars 44 interposed between the metal collar and the curved surface of the two grooves cut on the surface of the nonmetal pressure housing. And prevents biting by metal collars that may be present on the pressure housing.

In another embodiment of the present invention, a self-adhesive transparent polyester thin film sticker is used to protect the smooth surface area of the non-metallic pressure housing against marine product attachment and to protect the metal mounting against point corrosion, It improves the durability of the mounting device and makes it possible to clean it without any problems after recovering from sea water after prolonged immersion.

In another embodiment of the present invention, the use of a self-adhesive transparent polyester thin film sticker is intended to maintain the original color and texture of the pressure housing and its mounting device, and to maintain stamped text on the pressure housing. Provide additional means.

The invention is explained in more detail with reference to the accompanying drawings.

1 basically comprises a single cylindrical housing 1 made of marine material having a fixed end cap 2 and a removable end cap 3 fixed on the wall of the housing with screws 4. A typical design is shown which illustrates the conventional method of the prior art used in a system based on a conventional hydraulic pressure. The pressure transducer 5 is fitted to the end cap, and the hydraulic coupling device 6 is fixed on the end cap. A group of electronics printed circuit boards (pcb) 7 is fixedly mounted on a set of vertical mounting pillars 8 enclosed in a housing. Two cylindrical tubes 9 sealed with end caps 10 hold the battery which powers the electronics and the sensor. The entire assembly is mounted and supported on a single removable end cap 3 with an O-ring that ensures water resistance.

FIG. 2 is a cross-sectional view of a novel pressure housing for a hydraulic pressure based system of the present invention wherein the hydraulic pressure based system has a cylindrical housing having two compartments 13 and 14 cut from a single solid material. 12) is included by default. The circular disk 15 thus formed separates the two compartments from each other. An electronic compartment 13 with a transducer is provided to mount the transducer and the electronic and not open at the field station. The connector compartment 14 with a battery pack is provided to arrange a battery pack and an electrical connector that connects to a computer or any other device that enables initialization and data offloading of the electronics. It is free from the adverse effects of pollutants such as particles, dust, moisture, etc. suspended in the air that may be caused by accidental data offloading at the field station, equipment initialization, or battery replacement by sensitive electronic components and transducers in the environment. Makes it possible. An electrical connector 16 with an O-ring 17 and arranged axially in the center of the circular disk 15 serves for the purpose of electrically connecting the two compartments 13, 14. The seal plate 18 with a pair of side O-rings 19, 20 allows for waterproofing the electronic compartment 13 with a transducer. The retainer ring 24 fixes the seal plate 18 in its predetermined position. Another seal plate 21 with a pair of side O-rings 22, 23 allows for waterproofing of the connector compartment 14 with the battery pack. The retainer ring 25 places the seal plate 21 in its predetermined position, and the retaining ring 26 secures the retainer ring 25 to provide a beautiful fastener without the use of screws, bolts, nuts or clamps. to provide. The fixtures used in the novel pressure housings of the present invention are all made of nonmetals, eliminating the possibility of their chemical corrosion during prolonged immersion in water. The system of the present invention provides a hydraulic coupling device (HCD) which basically comprises a male component machined in the form of a female component 28 and a countersunk screw 29, which components are pressure transducers 30. And the end cap 18 of the transducer compartment electronic compartment 13 of the pressure housing 12 together with the required portion. These components, the viscous oil laminated in the space provided between the front end of the pressure transducer 30 and the countersunk screw 29, and the narrow gap between the threads of the male component and the female component, The pressure transducer is hydraulically connected to the surrounding brine medium by providing the necessary path for the transfer of water pressure to the pressure port. The HCD provided within the system of the present invention simply unscrews its male component from its slot, pours oil into the pressure port, and then screws the male component back into the air bubble or other hollow waste in the oil reservoir. Preventing space from being trapped allows for easy change of oil. The hollow cylindrical transducer retainer 31 screwed onto the inner surface of the axial recess on the seal plate 18 serves the purpose of providing mechanical stability to the pressure transducer 30. Another hollow cylinder 32 screwed onto the outer surface of the stepped portion on the seal plate 18 functions as another means for mounting the printed circuit board (pcb) 34 using four similar screws 35. It serves as a means for mounting the two clamps 33. The cylindrical hollow space cut from the metal bolt 36 waterproofed using an O-ring serves as a means of placing the temperature sensor 38 for the measurement of the water temperature. The battery pack 39 functions as a circuit, a sensor, and a means for supplying power to the computer interface means 40 for initialization and data offloading.

FIG. 3 has two collars 43 and two buffered nonmetal collars 44 interposed between the pressure housing 12 and the collar 43 which can be joined together by the use of several similar screws 45. It is sectional drawing of one mounting apparatus 41. FIG. This device serves as an easy means for mounting the pressure housing 12 to a suitable device arranged at sea.

4 shows time series sea level records measured by a pressure transducer with electronics incorporated into the pressure housing of the present invention.

FIG. 5 shows a time series water temperature record measured by an electronic device with temperature transducer incorporated into the pressure housing of the present invention.

Figure 6 shows a time series battery voltage record recorded by a data recorder incorporated into the pressure housing of the present invention.

The present invention provides a novel pressure housing for a hydraulic pressure based system comprising a cylindrical housing 12 having two compartments 13, 14. The two compartments are separated by a circular disk 15 formed to separate the two compartments from each other. One of the compartments 13 is provided to mount a transducer and an electronic device, and the other compartment 14 is electrically connected to a computer or any other device that enables initialization and data offloading of the battery pack and electronics. The electrical connector 16, which is provided for arranging the connector and has an O-ring 17 and is arranged axially in the center of the circular disk 15, has the purpose of electrically connecting the two compartments 13, 14. And a seal plate 18 having a pair of side O-rings 19, 20 to enable waterproofing of the electronic compartment 13 with the transducer, and the retainer ring 24 being sealed plate 18. In its predetermined position, another seal plate 21 with a pair of side O-rings 22, 23 allows for waterproofing of the connector compartment 14 with the battery pack, and 26) to retain the retainer ring 25, A hydraulic coupling device is provided that provides a beautiful fastener without the use of bolts, nuts or clamps, and basically includes a male component machined in the form of a female component 28 and a countersunk screw 29. The components here together with an integral part of the pressure transducer 30 form an end cap 18 of the transducer attachment electronics compartment 13 of the pressure housing 12, the two components and the pressure transducer. Viscous oil laminated in the space provided between the front end of the countersunk and the countersunk screw, and the narrow gap between the threads of the male component and the female component of the hydraulic coupling device are transmitted to the pressure port of the transducer. A hollow cylinder hydraulically connecting the pressure transducer to the surrounding brine medium by providing the necessary path for the connection, and screwing on the inner surface of the axial recess on the seal plate 18. The transducer retainer 31 provides mechanical stability to the pressure transducer 30, and another hollow cylinder 32 screwed on the outer surface of the step on the seal plate 18 uses four similar screws 35. A hollow space machined from the metal bolts 36, which are fitted with two clamps 33, which serve as means for mounting the printed circuit board (pcb) 34, and which are waterproofed using an O-ring 37. The temperature sensor 38 for the measurement of the water temperature is arranged, the battery pack 39 supplies power to the circuits and the sensors, and the computer interface means 40 is provided for initialization and data offloading.

The pressure housing is equipped with a separate transducer-mounted electronics compartment to prevent contamination, such as accidental data offloading at the field station, moisture, dust or any particles suspended in the air during instrument initialization or battery replacement. Avoiding entry improves the life of the transducer and electronics components by keeping the environment free of moisture and maintaining a clean environment. The pressure housing has a separate battery pack connector compartment, which allows accidental data off at the field station without contaminating the clean surroundings around the transducers and electronics that form an integral part of the measuring equipment located within the pressure housing. Allows loading, device initialization or battery replacement.

These two separate compartments of the pressure housing are cut from a single solid material to provide firmness and beauty. The body of the pressure housing, its seal plate, and retaining ring are all made from nonmetallic materials to prevent chemically induced corrosion or contamination of the underwater body during prolonged immersion in seawater. The method of using the retainer ring 25 for retaining the seal plate 21 in its predetermined position and the lock ring 26 for securing the pressure housing utilizes the use of protruding bolts, nuts or clamps which have conventionally been used. To avoid.

The hydraulic coupling device has a female component and a male component, both of which are selected from copper or a copper alloy to prevent biocontamination near the pressure inlet. The hydraulic coupling device has a flat end that is maintained at the same height as the flat seal plate at the center of the flat seal plate of the pressure housing, so that the dynamically induced pressure arising from the effects of flow, wave or combination of wave and wave Reduce the inaccuracy of the measurement

The technique of a hydraulic coupling device simply unscrews its male component from its slot, pours oil into the pressure port, and then re-screws the male component to trap air bubbles or other hollow waste space in the oil reservoir. This prevents the oil from being easily replaced. This simpler design of the hydraulic coupling device enables an easier and more economically feasible construction that has not been known so far, while providing all the basic requirements expected of such a device.

The pressure housing has a stainless steel mounting device with two cylindrical collars, providing an easy means for mounting it to any suitable device in its placement at sea. The cylindrical collar of the mounting device has two buffered nonmetallic collars, the two buffered nonmetallic collars being interposed between the metal collar and the curved surface of the two grooves cut on the surface of the nonmetallic pressure housing. Prevents biting by metal collars that may be on the bed.

Self-adhesive transparent polyester thin film sticker is used to protect the smooth surface area of the non-metallic pressure housing against marine product attachment and to protect the metal mounting against tack corrosion, improving durability of the pressure housing and mounting, After immersion, it is possible to clean up without any problem after recovery from sea water.

The apparatus of the present invention was implemented to record time series sea level and water temperature data (with time series recorder battery voltage) in Goa, Zuari estuary over a period of 3 months. It has been observed that the device of the present invention works efficiently and without any problems. It has been found that the performance of the hydraulic coupling device is excellent in terms of visual indicators in terms of maintaining viscous oil and prevents marine product adhesion. For identification purposes, the self-adhesive transparent polyester thin film sticker attached to a portion of the device significantly reduced the attachment of the mollusk compared to the area not protected by the sticker, maintaining its beauty. In addition, cleaning the areas protected by self-adhesive transparent polyester thin film stickers was much simpler than cleaning the unprotected areas.

The main advantages of the present invention are as follows.

1. Keep moisture free and clean surroundings by avoiding accidental data offloading in wet and dusty field stations and the ingress of moisture, dust or any floating particles in the air during battery replacement. This improves the lifetime of transducers and electronics in underwater systems.

2. The use of a novel device allows trouble-free opening and closing of the pressure housing, thereby avoiding the use of conventionally adopted jammers such as screws, bolts or clamps that protrude and are prone to corrosion.

3. Allows reliable delivery of hydraulic pressure to the pressure port of the transducer, while minimizing errors resulting from dynamic effects, preventing chemical corrosion by salt water, and providing compact, non-corrosive and biofouling hydraulic pressure. The use of a coupling device suppresses biofouling near the pressure inlet.

4. Provides beauty, light weight and non-corrosiveness to hydraulic-based systems for use in marine environments.

5. Providing means to prevent the point corrosion action, improves the durability of the pressure housing and mounting device, and makes it possible to clean without any problem after recovery from sea water after prolonged immersion.

6. Providing a hydraulic coupling device with a simpler design, which enables easier and more economically feasible construction, while providing all the basic requirements expected of such a device.

7. The constant of the time constant of the spiral oil path incorporated on the hydraulic coupling device is a certain level of vibration of the high frequency present in the gravitational waves primarily induced by wind and the pressure measurements caused by the movement of ships and boats secondarily. Provide mechanical filtration.

Claims (8)

A housing 12 having two compartments 13, 14, two compartments separated from each other by a circular disk 15, one of which provides for mounting a transducer and an electronics And the remaining compartment 14 is provided to place an electrical connector connecting the battery pack and the initialization device to enable initialization and data offloading of the electronics; An electrical connector 16 having an O-ring 17 and arranged axially in the center of the circular disk 15 to electrically connect the two compartments 13, 14; A seal plate (18) having a pair of side O-rings (19, 20) for sealing the electronics compartment (13) with the transducer; Retainer rings 24 for securing the seal plate 18 in its predetermined position; Another seal plate 21 having a pair of side O-rings 22 and 23 for waterproofing the connector compartment 14 with the battery pack; Retainer rings 25 for positioning the seal plate 21 in its predetermined position; A fixing ring 26 for fixing the retainer ring 25; A hydraulic coupling device consisting essentially of a male component (28) and a male component machined in the form of a countersunk screw (29), wherein the female component and the male component are accompanied by an integral part of the pressure transducer (30). Forming an end cap 18 of the transducer compartment electronics 13 of the pressure housing 12, the female component 28 and the male component 29, the front end of the pressure transducer and the counter head. The viscous oil laminated in the space provided between the screws and the narrow gap between the threads of the male and female components of the hydraulic coupling device provide the necessary path for the transfer of sea water pressure to the pressure port of the transducer. A hydraulic coupling device adapted to hydraulically connect the pressure transducer to the surrounding brine medium; A hollow cylindrical transducer retainer 31 screwed on the inner surface of the axial recess on the seal plate 18 to provide mechanical stability to the pressure transducer 30; Screwed on the outer surface of the step on seal plate 18 to mount two clamps 33 which serve as means for mounting a printed circuit board (pcb) 34 using four similar screws 35. Another hollow cylinder 32; Hollow spaces cut from metal bolts 36 waterproofed using O-rings 37 to place temperature sensors 38 for measurement of water temperature; A battery pack 39 for supplying power to circuits and sensors; And computer interface means (40) for initialization and data offloading. The body of the pressure housing 12, the seal plates 18, 21, and the retaining rings 24, 25, 26 are all contaminated with chemically induced corrosion or contamination during prolonged immersion in seawater. Pressure housing, characterized in that it is made from a non-metallic material to prevent the underwater body. The pressure housing as claimed in claim 1, wherein the seal plate 21 is located in its predetermined position by a retainer ring 25 and a fixing ring 26 for fixing the pressure housing. 2. The female component 28 and the male component 29 are both made from a material selected from the group consisting of copper, copper alloys and similar alternative materials capable of preventing biocontamination in the vicinity of the pressure inlet. Pressure housing, characterized in that made. 2. The hydraulic coupling device of claim 1 having a flat end portion disposed on the flat seal plate of the pressure housing at the same height as the hydraulic coupling device, thereby providing dynamics resulting from the effects of flow, waves or a combination of flow and waves. A pressure housing, characterized by reducing the induced pressure measurement inaccuracy. 2. The cylindrical collar 43 of the mounting apparatus has two buffered nonmetal collars 44 interposed between a metal collar and a curved surface of two grooves cut on the surface of the nonmetal pressure housing. Pressure housing characterized in that it prevents biting by metal collars which may be on the pressure housing. 2. The self-adhesive transparent polyester thin film sticker according to claim 1, wherein self-adhesive transparent polyester thin film stickers are used to protect the smooth surface area of the non-metallic pressure housing against marine product attachment and the metal mounting against point corrosion action. Pressure housing. 8. The method of claim 7, wherein the use of self-adhesive transparent polyester thin film stickers provides additional means for maintaining the original color and texture of the pressure housing and its mounting device, and for retaining stamped text on the pressure housing. Providing a pressure housing.