EF-Series Instruction Manual
Rev 2/01 4-5
9.
When complete, select the OK (or Done) pushbutton to close the Calibration window, to
cancel the freeze values, and to begin using live readings for the flow calculations.
4.6.2 Calibrating the Meter Inputs
The ROCLINK Configuration Software (for Windows or for DOS) is used to perform initial
calibration or re-calibration, such as after an orifice plate is changed in the meter run handled by the
EF-Series Unit.
Perform the following steps:
1.
Launch the ROCLINK Configuration Software and connect to the flow computer.
2.
Select the Calibration function from the Meter menu.. Alternately, you can select Calibration
from the Quick Setup window (available under File menu). This opens the Meter Calibration
window.
3.
The current reading is shown under each meter input as the Freeze Value. These values will be
used in the flow calculations while the points are being verified. Press the Freeze pushbutton
(not present for Quick Setup Calibration since in this case freezing is automatic).
CAUTION
To protect the differential cell of the Sensor, open the by-pass valve on the valve
manifold prior to isolating the sensor from the process. This will keep one side of
the differential sensor from being subjected to high pressure while the other side
has no pressure applied. This should be done whether you are calibrating
differential or static pressure. Refer to Figure 4-1 on page 4-6 for the
recommended sequence.
4.
If you are calibrating a pressure input, read the Caution above, and then isolate the Sensor from
the process. If you are calibrating a temperature input, simply proceed to the next step.
5.
If you are calibrating a pressure input, set up the pressure calibrator and make the necessary
connections to the Sensor. If you are calibrating a temperature input, disconnect the RTD
sensor and connect a decade box (or comparable equipment) to the RTD terminals of the flow
computer.
6.
Select the Calibrate pushbutton under the desired input. This begins the calibration sequence
with the Set Zero dialog box.
7.
Apply the low (zero) value. For a pressure input, this would typically be open to atmosphere.
8.
Enter the applied value in the Dead Weight / Tester field of the Set Zero dialog. For static
pressure on an absolute-pressure device (standard for EF-Series Units), remember to enter the
actual atmospheric pressure, such as 14.73 psi.
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