To optimize flow measurement accuracy, flow meters should be installed as close to the process connection as possible. Process piping and tubing leads should be kept to a minimum.
• Smart flow transmitters, which require little routine maintenance, should be mounted adjacent to the flow elements in pipeways, provided they can be accessed using ladders, portable staging, or mechanical lifts.
• Analog flow transmitters, indicators, recorders, and controllers require more frequent access. Consideration should be given to locating these instruments at grade or adjacent to a stairway-accessible platform. When these instruments are used for process balance or utilities “hard charge” service, frequent maintenance calibration checks are required, and accessibility is an absolute requirement in planning the installation.