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...Instrument symbol letter identification table miscellaneous symbols valve actuators first succeeding letters measuring elements measured or readout output initiating modifier passive function flow orifice diaphragm operated back pressure variable seal video camera regulator self contained a analysis alarm level gage glass float reducing c conductivity control magnetic displacement element leak detection vortex meter with handwheel differential type d density instruments cctv hand e voltage xx indicates the rupture disk relief f external tap pneumatic piston g area rotameter bell single acting manually h initiated high indicator valved vacuum attached angle pattern i current indicate temperature sensing j power k time well radiation inline ia l light low double w positioner m moisture o restriction...