Calibration Examples; Calibration With Standard Displacer And Torque Tube - Fisher FIELDVUE DLC3010 Instruction Manual

Configuration
October 2014
8. If the reference meter reading equals 4 mA or the low output value, select Yes and continue to step 9. If not, select
No and return to step 7.
9. The Field Communicator commands the instrument to set its output to 20 mA or the high output value.
10. Enter the reading from the reference meter.
11. If the reference meter reading equals 20 mA or the high output value, select Yes and continue to step 12. If not,
select No and return to step 10.
12. The Field Communicator commands the instrument to set its output back to the original value.

Calibration Examples

Calibration—with Standard Displacer and Torque Tube
Run the initial calibration near ambient temperature at design span to take full advantage of the available resolution.
This is accomplished by using a test fluid with a specific gravity (SG) close to 1. The value of SG in the instrument
memory during the calibration process should match the SG of the test fluid being used in the calibration. After the
initial calibration, the instrument may be set up for a target fluid with a given specific gravity, or an interface
application, by simple configuration data changes.)
1. Run through Guided Setup and verify that all sensor data is correct.
Procedure:
Change the PV mode to Level
Set the Level Offset value to 0.00
Set the Specific Gravity value to the SG of the test fluid being used.
Establish the test fluid level at the desired process zero point. Make sure that the DLC3010 lever assembly has been
properly coupled to the torque tube (see coupling procedure on page 38). To unlock the lever assembly and allow it to
freely follow the input, close the coupling access door on the instrument. It is often possible to watch the instrument
display and/or the analog output to detect when the fluid hits the displacer, because the output will not start moving
upward until that point is reached.
Select the Min/Max calibration from the Full Calibration menu, and confirm that you are at the 'Min' condition at the
prompt. After the 'Min' point has been accepted, you will be prompted to establish the 'Max' condition. (The 'displacer
completely covered' condition should be slightly higher than the 100% level mark to work correctly. for example, 15
inches above the zero mark would generally be enough for a 14 inch displacer on a 249B, because the amount of
displacer rise expected for that configuration is about 0.6 inch.)
Accept this as the 'Max' condition. Adjust the test fluid level and check the instrument display and current output
against external level at several points distributed across the span to verify the level calibration.
a. To correct bias errors, 'Capture Zero' at the exact zero level condition.
b. To correct gain errors, 'Trim Gain' at a precisely­known high level condition.
If the measured output doesn't come off the low saturation value until the level is considerably above the bottom of
the displacer, it is possible that the displacer is overweight. An overweight displacer will rest on the lower travel stop
until sufficient buoyancy has developed to allow the linkage to move. In that case, use the calibration procedure for
overweight displacers found on page 61.
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Instruction Manual
D102748X012