A pair of annular O-rings or other flexible sealing members 72 are respectively disposed in the openings 70 of the ears 58 of the bracket member 31 to be compressed between the cylindrical parts 69 of the fluid transfer member 61 and the surface 71 of the module 30 to fluid seal the passages 66 of the fluid transfer member 61 with the passages 60 and 51 of the module 30 even though the fluid transfer member 61 is not fastened directly to the module 30. Match. Terms in this set (2) Operation (1) Bellows diaphragm senses the high pressure and (2) moves the force bar to the left about the pivot point. 331,337, filed Feb. 9, 1973 now abandoned. A pressure transmitter is a transducer that converts pressure into an electrical signal. 3. It outputs both analog and digital signals corresponding to the pressure. In this paper, a novel force balance transducer based on an electromagnetic force balance lever structure for a normal range is proposed. •pplying a leakag-detecting fluid to the A ... force-balance instrument that measures liquid level, liquid density, or inter-face level, and transmits the measurement as a proportional 0.2 to 1.0 kgf/cm: 2: or 1, such increase in pressure in the chamber 50 is maintained and the new value of the pressure fluid in the chamber 50 is directed out of a signal passage 51 of the module 30 to indicate that a new pressure differential condition is existing in the primary or main body 12. Let go of the red button once the transmitter is on. When we squeeze this piezoelectric material or apply any force or pressure, the transducer converts this energy into voltage. The primary device for the body 12 has a primary lever means 36 pivotally mounted at 37 so that a lower end 38 thereof is interconnected by tying means 39 to a flexible diaphragm 40 which moves to the right or left depending upon a change in pressure acting against the outboard diaphragms 41 and 42 in a manner well known in the art. 7 is a fragmentary, cross-sectional view taken substantially on line 7--7 of FIG. United States Patent 3742969. Force Balance Transmitter Force balance refers to the system whereby the free motion of the sensor is limited and actively opposed by some mechanical or electrical means. Accordingly, the tubular connectors 77 and the fluid transfer member 61 isolate the secondary assembly from deflections of the base, provide a tubeless means of making pneumatic connection, compensate for misalignment of base to secondary, and provide for automatic pneumatic connection of the relay module when it is attached to the secondary frame. However, it was found according to the teachings of the copending patent application to Rosenfeld et al., Ser. PLAY. Connect transmitter to an input air supply regulated at a fixed value between 120 and Thus, it is a feature of such copending patent application to provide a self-contained relay module unit that is adapted to be simply and readily attached to and detached from the primary device in a least-time-consuming manner while being adapted to accurately act on the secondary lever and rebalance the same. In Figure 1.3-4 a simplified force balance transmitter is shown. Force-balance mechanisms tend to be bulky, and they translate external vibration into inertial force which adds “noise” to the output signal. Robertshaw Controls Company (Richmond, VA), 137/84, 137/85, 137/86, 137/608, 285/137R, 285/370, Click for automatic bibliography 1. This makes a force-balance instrument far less susceptible to errors due to metal fatigue or any other degradation of spring characteristics. Conversely, a change in pressure differential causing the diaphragm 40 to move to the right in FIG. No. 1 is a fragmentary, cross-sectional view with certain parts broken away of the improved pneumatically operated force balance transmitter of this invention. Thus, it can be seen that this invention provides an improved pneumatically operated force balance transmitter and method of making the same. 1, the improved pneumatically operated force balance transmitter of this invention is generally indicated by the reference numeral 10 and comprises a base structure that is generally indicated by the reference number 11 and includes a main body 12 having a plurality of housing parts 13, 14, 15 and 16 secured thereto for a purpose as will be apparent hereinafter and a base 17 that is fastened to the top surface 18 of the main body 12 by threaded fastening members passing through openings 19 in the base 17 and being respectively received in threaded openings 20 formed in the top surface 18 of the main body 12. The force balance sensor is intended for DC and low frequency acceleraŸon measurements, such as those encountered in the moŸon of vehicles, aircraL and ships. This voltageis … These sensors are capable of measuring levels from as low as 0.0001g up to 200g’s over a frequency range from DC to 1000Hz. The piezoelectricmaterial is one kind of transducers. The force - balance principle used in pneumatic instruments At the center (R) of the lever QS there is a stem on which one end of the lever RTU is supported while it is pivoted at point U and has a flapper nozzle sensor located at point T. Write. 1 and illustrating the top of the main body of the base structure. 1 and thereby pivot the lever means 36 in a counterclockwise direction and thus cause a counterclockwise pivoting of the secondary lever 26 and, thus, a greater opening of the pilot nozzle 47 to thereby cause a decrease in the pressure of the fluid in the loading chamber 48 of the bellows balance member 50 whereby the rebalance member 50 moves to the left to cause clockwise pivotal movement of the lever 26 interconnected thereto so that the lever 26 will be returned to its fully balanced or vertical condition. Here, we see a diagram of a force-balance pneumatic pressure transmitter, balancing a sensed differential pressure with an adjustable air pressure which becomes a pneumatic output signal: Differential pressure is sensed by a liquid-filled diaphragm “capsule,” which transmits force to a “force bar.” If the force bar moves out of position due to this applied force, a highly sensitive “baffle” and “nozzle” mechanism senses it and causes a pneumatic amplifier (called a “relay”) to send a different amount of air pressure to a bellows unit. Using a 9/64 in hex-key wrench, remove the two force bar screws (3). The force coil presses against the range bar which pivots to counteract the initial motion of the force bar. Referring now to FIG. 3 is a fragmentary, cross-sectional view taken substantially on line 3--3 of FIG. For example, should the pressure on the diaphragm 42 increase over the pressure on the diaphragm 41, such pressure differential will cause the diaphragm 40 to move to the left in FIG. Abstract: A pneumatic force balance transmitter in which an input force proportional to the fluid flow rate being measured is applied to a force bar pivoted about a transverse axis to produce a torque. Differential pressure transmitters constructed for industrial measurement applications typically consist of a strong (forged metal) body housing the sensing element(s), topped by a compartment housing the mechanical and/or electronic components necessary to translate the sensed pressure into a standard instrumentation signal (e.g. Pressure transmitter. Provided with a variety of optional features, these models offer a wide rangeability in a single instrument. The pressure pm to be transmitted is applied to a diaphragm which carries the equivalent of the flapper. Pressure is an expression of the force required to stop a fluid from expanding, and is usually stated in terms of force per unit area. The upper end 43 of the lever means 36 is interconnected by a tying means 44 to the secondary lever 26 at the upper end thereof so that movement of the diaphragm 40 upon changes in the pressure differential across the diaphragms 41 and 42 will cause pivotal movement of the secondary lever 26 about the fulcrum 28 with such pivotal movement of the secondary lever 26 being subsequently rebalanced by the relay module unit 30 as fully described in the aforementioned copending patent application so that all of the details of the relay module 30 need not hereinafter be set forth other than the general structure thereof that is necesary to understand the features of this invention. In particular, one embodiment of this invention provides a force balance transmitter having a base structure provided with passage means and a secondary assembly attached thereto that includes a pneumatically operated relay module detachably secured to the secondary assembly and having passage means. 4 is a fragmentary, cross-sectional view taken substantially on line 4--4 of FIG. The blind type differential pressure transmitter, mod. A common manual-balance system is the type of scale used in laboratories to measure mass: Here, the unknown mass is the sensed quantity, and the known masses are the adjustable quantity. Digital air pressure sensor. & Terms of Use. As is well known, a secondary lever 26 of the primary 12 is vertically suspended by a vertically disposed flexure leaf spring 27 and is adapted to pivot against an adjustable fulcrum member 28 carried on a rotatably mounted threaded rod 29 which is rotated to set the position of the fulcrum 28 relative to the secondary lever 26 so as to correlate the range of the pressure differential of the primary device 12 to the range of a pneumatically operated relay module 30 of the transmitter 10 that forms part of the secondary assembly thereof and is detachably secured in a manner hereinafter described to a bracket means 31 that also forms part of the secondary assembly and which is attached to the top surface 18 of the main body or primary 12 by threaded fastening members passing through opening 32 formed in bottom flange members 33 of the bracket 31 and being received in threaded opening 34 in the top surface 18 of the primary 12, such ears 33 fully fitting within a cutout 35 passing through the base 17 so that the base 17 is isolated from the bracket 31 and, thus, from the relay module 30. pneumatic force balance transmitter see Figure 5.6e. It is a type of force balance transmitter. A “self-balance” system continuously balances an adjustable quantity against a sensed quantity, the adjustable quantity becoming an indication of the sensed quantity once balance is achieved. The basic principle behind the measurement of force is – when a force is applied on an object, the object gets displaced. 5 is a partial front exploded perspective view of certain parts of the manifold and braket means illustrated in FIG. 8. With minor modifications to the design of this pressure transmitter, we may convert it from pneumatic to electronic force-balancing: Differential pressure is sensed by the same type of liquid-filled diaphragm capsule, which transmits force to the force bar. 3 of FIG pressure into an electrical signal 331,337, filed Oct. 22, now... Measurement is the self-balancing system Read:  bellows, Diaphragms and Bourdon Tubes principle during such.... 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