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Reduce calibration costs of analogue pressure gauges
4th July 2007  If your costs are running high in order to maintain ISO9000 adherence for calibrating pressure gauges used on production machinery, maybe it is time to invest in a precision digital manometer.You will dramatically reduce your annual re-calibration charges and there will be no need to maintain a buffer stock of dial pressure gauges to keep manufacturing processes running while other production critical pressure instruments are sent away for their annual calibration. If all analogue pressure gauges are fitted with a three way isolation valve they can be calibrated in-situ by teeing into the pressure gauge with a quick release pressure connection and isolating the device under test. You can then apply pressures with a hand-pump to the pressure gauge and calibrate at each set-point. When setting each pressure calibration point use the cardinal points (division markers) on the pressure gauge under test rather than setting the pressure to the exact point on the digital display of the pressure calibrator. This way it will be easier to read the error from the digital display which has a much higher display resolution than the pressure gauge under test. The LEX1 high accuracy digital pressure gauge has a standard accuracy of 0.05% of full scale with enhanced precision options of 0.025% and 0.01% of full scale if required. A complete selection of pressure ranges are available: -1 to 2 bar, -1 to 20 bar, 200 bar, 400 bar, 1000 bar gauge or absolute. If an absolute pressure range is chosen for the LEX 1 digital manometer it can be easily converted to gauge reference pressure by using the zero tare feature so the display reads zero pressure when measuring atmospheric pressure rather than a reading close to 1000 mb. The display features of the LEX-1 digital test gauge also include 13 pressure units: bar, psi, mbar, inHg, mmHg, inH2O, ftH2O, cmH2O, mH2O, Kg/cm2, KPa, MPa, hPa. The maximum or minimum pressure reading can be displayed in the lower portion of the display and can be reset to the actual pressure at anytime via the two push buttons on the pressure gauge front panel. For continuous use, the auto off after 15 minutes since last key press can be turned off if required for use as a process pressure gauge. For hazardous environments the LEX1 portable pressure indicator is ATEX approved for intrinsic safety with a II 1 G EEx ia IIC T6 or T5 certification. The LEX-1 digital pressure comparator utilises silicon strain gauge technology to achieve a high precision accuracy and stability of pressure measurement over time and the instrument need only be calibrated once per year as part of ISO9000 compliance to maintaining a traceable calibration standard. The LEX 1 digital pressure gauge is a convenient compact size measuring only 59 x 95 x 32 mm and with a battery capacity of 2000 hours from a single small CR2430 battery it is a useful instrument for any factory maintenance or quality assurance engineer carrying out calibration of pressure gauges on production equipment.
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