Flow Sensor
4-4 Rev 2/01
4.6 CALIBRATION
Calibration is performed using the ROCLINK Configuration Software. The procedure allows you to
perform a 5-point (minimum, maximum, and up to three intermediate points) calibration of the Sensor.
4.6.1 Verifying Calibration
The ROCLINK (for Windows or for DOS) Configuration Software can be used to verify the calibra-
tion. This is normally done as a check to see if a re-calibration is needed. To verify, 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.
Observing the caution above, apply the desired pressure setting to the input.
5.
Select the Verify pushbutton that is listed under the input to calibrate. This displays the Verify
Calibration dialog box.
6.
If the Tester Value and the Live Reading are to be logged to the Event log as a record of the
verification, select the Log Verify pushbutton. Press Done to return to the Meter Calibration
window.
7.
Repeat the above steps for any other inputs that need to be verified.
8.
Observing the following caution, place the Sensor back in service.
CAUTION
To protect the differential cell of the Sensor, do not close the by-pass valve on the
valve manifold until after process pressure has been reapplied. This will keep one
side of the differential sensor from being subjected to high pressure while the
other side has no pressure applied. Refer to Figure 4-2 on Page 4-7.
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