Sensor Accuracy Verification

           

          The following procedure should be used for verifying the accuracy of the installed pressure sensors

           

          Items needed

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

           

          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 and open the ball valves

          2. Go to the “Process Variables” section of the setup menu and check the indicated differential pressure reading.  This is found in the P1.30 parameter of the keypad or the Process Variable menu of the touchscreen. 

          3. The differential pressure reading on the flow meter should be +/- 4% full scale of the compared reading of the manometer

            1. Example: a full scale reading of 12”wcg should be +/- 0.48”wcg

          4. If the sensors are determined to be out of tolerance, the sensors may need to be replaced.  Please contact SSI for next steps.