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PROCON offers multi-pen Flow–Cum–Pressure Recorder with Differential Pressure bellows unit and Helical bourdon as sensing element. The D.P. bellows unit type manometer contains two opposing bellows which are enclosed in separate pressure tight chambers, the bellows on the high pressure side will contract, moving the connecting shaft in direction of Lower pressure and causing the bellows assembly on the lower pressure side to expand. Motion of the bellows assembly is transmitted through a torque tube to the associated recorder pen through four bar linkage system. For calibration, coarse and fine zero adjustments, span and angularity adjustments are provided. Three-valve manifold is supplied alongwith each recorder, on the pressure side, line pressure is transmitted to the bourdon tube. The expansion and the movement of the Bourdon tube is transmitted to pen through the linkage system. For calibration, coarse and fine zero adjustments, span and angularity adjustments are provided.