Table of Contents
Advertisement
On the Calibration tab, select DP from the Calibration drop-down menu.
Select either a 3- or 5-point calibration from the corresponding drop-down menu.
Select the Range (URL) of the transducer DP pressure cell. The range should agree with the
tag attached to the transducer and target values based on the URL will display in the
Calibration table.
Verify that the vent valve is closed.
Open both the high and low equalizer valves.
Close both the downstream and upstream tap valves.
Open the atmospheric vent valve.
Click Low Cal Point. Verify the current reading is continuously updated. This should
represent the lowest calibration point.
When the current reading stabilizes, click OK; otherwise, enter a different value and then
click OK.
After the previous value is accepted, the next calibration point button will activate. Click
the activated button.
IMPORTANT NOTE: This procedure details the calibration procedure for a three (3) point
calibration. Available pressure points will be displayed in the calibration window and will
become active in the prescribed calibration order: Low Cal Point, 100% Cal Point, and 50%
Cal Point.
These instructions are specific to a three (3) point calibration. For a five (5) point
calibration, enter 5 values.
Connect the calibration standard to the calibration test port.
Close the high side equalizer valve and verify that the low side is vented to atmosphere.
Apply pressure to 100% of the transducer range (URL or 100% of the target value).
When the current reading stabilizes, click OK; otherwise, enter a different value (pressure
value from the calibration source), and then click OK.
After the previous value is accepted, the next calibration point button will activate. Click
the activated button.
Apply pressure to the next target value as shown in the Calibration window.
In a 3-point calibration, this will be the final calibration point and is equal to 50% of the URL of the
transducer. The pressure value for 50% of the URL will be displayed in the window.
Example: If the transducer has a URL of 1500, then 50% of that pressure, or the Target pressure, is
750.
In a 5-point calibration, this will be the third value and will be equal to 75% of the transducers URL.
When the current reading stabilizes, click OK; otherwise, enter a different value (pressure
value from the calibration source), and then click OK.
IMPORTANT NOTE: For a 3-point calibration, SP calibration is now complete. For a 5-point
calibration, two more points must be calibrated: 50% and 25%.
Repeat steps 17 through 19 until all calibration points have been pressured.
Return the manifold to service before exiting Calibration mode.
Following the initial installation of a flow computer, it may be desirable to use the Zero Transducer
command to baseline the flow computer measurement.
Use Zero transducer to adjust pressures during regular maintenance. Pressures that are out of
alignment by the same amount, could be the result of a linear shift.
2 1 0 60 26M NAA | XSER IE S
G 5
| 1 2 7
Advertisement
Table of Contents
