Onsite Foundation Fieldbus HART Transmitter Calibration
• Process pressure transmitters require regular calibration for peak performance.
• Frequency of calibration depends on local, national, safety, or environmental regulations, calibration reason, process conditions, ambient conditions, and installation environment.
• Direct-mounted pressure transmitters should be calibrated every four to six years if installed inside in a controlled environment on a process with stable conditions, and once every year if installed outside on a stable process.
• The maximum permissible error (MPE) is crucial when calibrating pressure transmitters.
• Test equipment should simulate the transmitter input with an accurate pressure source, traced back to the National Institute of Standards and Technology.
• Calibration should be conducted in a stable environment, with regular sensor trim adjustments performed by a qualified technician under manufacturer's guidance.
• A properly trained technician is essential for calibration, with skills in the mechanics of the calibration process and accurate documentation.
• The correct calibration cycle for a pressure transmitter depends on the purpose and application, requiring different calibration intervals for the same pressure transmitters in different operating units or processes.