Remove force balance unit per previous applicable procedure. The blind type differential pressure transmitter, mod. 1. A cover member or hood 21 is carried on the outer peripheral portion 22 of the base 17 and is sealed thereto by an annular sealing gasket 23 being received in an annular groove 24 in the top surface 25 of the base 17 as illustrated. First we have to know that the Force Balance Pressure Transmitters are very old concept which uses pneumatic (air) signals for transmitters operation. 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. A distinct advantage of force-balance pressure instruments (besides their inherent linearity) is the constraining of sensing element motion. 1. In order to accomplish such repairs in the field, a relatively long "downtime" of this primary device is required because of the complicated and time consuming assembly and disassembly of the secondary assembly during the repair thereof. We'll assume you're ok with this, but you can opt-out if you wish. Such reduced pressure in the chamber 50 is now directed as a signal out of the outlet 51 to indicate the change in pressure differential now existing of the primary device 12. 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. The Speed Force transmitter is a device that transmits the Speed Force in a speedster's system to another, developed by Dr. Harrison Wells.  Credits : Tony R. Kuphaldt – Creative Commons Attribution 4.0 License. However, the tubular member 77 of the fluid transfer member 61 of this invention are free to slide and pivot in the base and fluid transfer member cavities to provide a certain degree of "universal joint" action and thereby prevent base deflections from being transferred to the fluid transfer member and, thus, to the module 30 and other parts of the secondary assembly. A piezoelectric transducer(also known as a piezoelectric sensor) is a device that uses the piezoelectric effect to measure changes in acceleration, pressure, strain, temperature or force by converting this energy into an electrical charge. FIG. The piezoelectricmaterial is one kind of transducers. Test. Privacy Policy When the system returns to equilibrium, the milliampere current through the force coil will be a direct, linear representation of the process fluid pressure applied to the diaphragm capsule. The base 17 has a pair of passages 73 provided therein and respectively leading from tubular projections 74 on the top surface 25 thereof to threaded ports 75 formed at the end 76 of the base 17 for attachment to suitable conduits and the like for respectively directing fluid pressure to and from the base 17 and, thus, to and from the module 30 through the fluid transfer member 61 in a manner now to be described. FIG. 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. 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