Calibration Verification

     

    The following procedure should be used for verifying the calibration of the flow meter

     

    Items needed

    • Calibrated Manometer with a usable range of 0 – 27.7 ”wcg (0 – 1 PSI)

    • Certificate of Calibration for the meter being verified

     

    Procedure

     

    1. Connect the high and low pressure ports of the manometer to the high and low pressure ports of the flow meter with the necessary tubing. Open the ball valves

    2. Using the Verification Data section of the Certificate of Calibration, enter a flow setpoint based on the points given

    3. Once setpoint has been achieved, verify the differential pressure on the manometer is within the tolerance indicated for that point in the Verification Data section

      1. If the differential pressure reading is out of tolerance, verify the pressure and temperature values match the values listed under the “Calibration Condition” section of the “Certificate of Calibration”.  If the values are different, you will need to use the equation given on the cert, along with the actual pressure and temperature readings to obtain new differential pressure points.  These values can be found in the keypad in the setup menu under the P1.10 & P1.20 parameters or in the touchscreen Process Variable Menu.

    4. Once the verification is complete, close the high and low pressure port ball valves and remove the manometer and tubing

    5. If the meter is determined to be out of tolerance, continue to the “Sensor Accuracy Verification” section of the manual

    6. If the sensors are determined to be within tolerance but the flow rates are not, the meter may need to be recalibrated by SSI if necessary.  Please contact SSI for next steps.