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3.3 Calibration Modes & Field Calibration (continued)
3.3.5. Two Point Calibration
Two point calibration mode uses two fixed material calibrations to model the behavior
of the process material being measured. Calibration of the DCM while in Two Point
calibration mode involves teaching the DCM the electrical properties over a span of
process temperature to ensure the proper correction due to temperature affects. Density
correction factors are also calculated during this process.
To perform a Two Point Calibration, complete the following calibration process.
3.3.5.1 Calibration Procedure for Point 1
1. Complete the initial commissioning process and insure the UIV CM-DC system is
properly install and configured. Refer to section 2.0 for details on initial setup and
commissioning.
2. Navigate the DCM to the "CAL MOD" menu at address 2.4 and verify the unit is set
to "TWO PT" to activate the Two Point calibration mode.
a. See section 3.2 – Operating the User Interface for details on navigating the DCM
menu system.
b. See section 3.3.2 – Setting the Calibration Mode for details on verifying and
changing the calibration mode.
3. Place the oil processing system into 'Normal Operating Mode'.
a. For LACT applications this means actively pumping oil through the wellhead
LACT and allowing roughly 1-2 minutes for the system to stabilize and all air/gas to be
removed from the system.
b. For Truck/Rail Car unloading stations this means actively transferring oil
through the unloading LACT and allowing roughly 1-2 minutes for the system to
stabilize and all air/gas to be removed from the system.
4. Navigate to the "CUTCAL1" sub-menu at menu address 2.1 and enter the sub-menu
by pressing 'ENTER'.
5. Add the new calibration point by following the procedure indicated in section 3.3.3
"Adding a Calibration Point".
6. Press and hold the 'BACK' button for 5 seconds to return to the meter display.
a. The H2O cut should read the entered water cut percentage.
3.3.5.2 Calibration Procedure for Point 2
1. Calibration of point 2 should be complete after point 1 is calibrated. For the best results,
perform calibration of point 2 when the process conditions are at least 10°F different in
temperature or 2 API different in density from point 1.
2. Navigate the DCM to the "CAL MOD" menu at address 2.4 and verify the unit is set
to "TWO PT" to activate the Two Point calibration mode.
a. See section 3.2 – Operating the User Interface for details on navigating the
DCM menu system.
b. See section 3.3.2 – Setting the Calibration Mode for details on verifying and
changing the calibration mode.
Configuration and Calibration
27
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