Fisher FIELDVUE DLC3010 User Manual

Instruction Manual
D102748X012
Configuration
October 2014
57
Observations of the sight glass or other independent measurements may be logged against DLC3010 outputs over
time. The ratio of the independent‐observable process changes to the DLC3010 output changes may then be used as a
scale factor to modify the theoretical torque rate stored in the instrument. After each gain adjustment, a new zero
trim will be required. When a plant‐maintenance shutdown occurs, the instrument may be isolated and calibrated in
the normal manner.
Partial Calibration
Field Communicator Configure > Calibration > Primary > Partial Calibration (2-5-1-3)
Partial Calibration operations are useful when it would take too long to establish a second data point in a single
session. There are of two partial calibrations: capture and trim. The 'capture zero' operation sets the input zero
reference angle to the value currently being measured. It is therefore valid only at the defined zero process condition.
Trim operations recompute either gain or zero reference angle with one observation of process data. The calibration
parameter that is NOT being trimmed is assumed to be correct.
Capture Zero
Capture Zero captures the current value of the torque tube angle as the input zero. The displacer must be loading the
torque tube, and not resting on a travel stop. The torque tube must be coupled to the DLC3010 and the coupling
access door must be closed. In Level mode, the captured angle represents zero differential buoyancy on displacer, and
must be obtained at the actual process zero condition. In Interface and Density mode, the captured angle represents
zero absolute buoyancy on displacer, and must be obtained at actual dry condition.
If the displacer is overweight and it is necessary to use the partial calibration methods, select Level mode and enter the
differential density before using ‘Capture Zero’ and ‘Trim Gain’. After the gain is correct, switch back to Density or
Interface mode, (reenter individual densities if Interface), then perform a ‘Trim Zero’ procedure to backcompute the
required zero buoyancy angle.
The Capture zero procedure prompts you to verify the instrument is coupled to torque tube, coupling access door is
closed, and verify that the displacer is completely dry.
Note
If the handle on the coupling access door is in the position towards the front of the transmitter, the coupling access hole is open
and the lever is “locked” (pinned in the neutral travel position). In this condition, the true “at‐rest” position of the linkage may not
be captured correctly. Moving the handle to the rear of the transmitter closes the coupling‐access hole and unlocks the lever.
It functions as the pre‐calculation zero for the process measurement algorithm. This procedure can be run either
before or after most of the gain. However, the procedure returns a valid result at only one input condition - zero
buoyancy, although in Level mode, it is equivalent to zero differential buoyancy.
Before calibration, use the Configure > Manual Setup >Sensor menu to verify that all sensor and compensation data
match the calibration conditions.
Trim Gain
Trim Gain operations recompute gain with one observation of process data. The calibration parameter that is NOT
being trimmed is assumed to be correct.
Trim Gain trims the torque rate value to align the digital Primary Variable with the user’s observation. This calibration
assumes that sensor zero is already accurate and only a gain error exists. Actual process condition must be nonzero

Fisher FIELDVUE DLC3010 Specifications

General

Brand	Fisher
Model	FIELDVUE DLC3010
Category	Controller
Language	English