Digital Manometer Applications
High accuracy digital manometers/calibrators like the Meriam M400 are particularly useful as calibrators for pressure transmitters, pressure recorders, and other pressure measuring devices. A typical set-up for transmitter calibration is shown at the right. The digital manometer is connected through a tee to a transmitter and a pressure source (often a hand pump). The 4 – 20 mA output from the transmitter is also connected to the digital manometer. An auxiliary loop supply (if needed) provides 24v DC power to the transmitter.
After zeroing the digital manometer, and with zero pressure applied to the transmitter, the transmitter is adjusted for a 4 mA output. This output is read on the current display of the digital manometer
Next, the pressure source is adjusted to the full scale pressure of the transmitter. A calibrator class digital manometer will indicate this pressure to an accuracy of 0.05% of reading, and a good hand pump will set this pressure to a resolution of 0.01″ H20. The transmitter output is adjusted for a 20 mA output, which is again read on the current display of the digital manometer. Compared to other calibration techniques, a digital manometer calibration is fast and simple. There are no cumbersome boxes, gas cylinders, regulators or weights to set up; and no special platforms or critical procedures for leveling.
Article by Meriam Process Technologies®
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