KROHNE OPTIFLEX 2200C SIL - Manual (Page 24)

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SERVICE
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OPTIFLEX 2200 C
www.krohne.com 01/2013 - 4000738603 - AD SIL OPTIFLEX 2200 R03 en
8.5.3 Measuring range check (in process conditions)
The complete device (the signal converter, the process connection and the probe) is installed on
the tank in process conditions. We recommend that you use this procedure to do a measuring
range check.
Procedure
• Attach the signal converter to the probe. For more data, refer to the "Installation" chapter
(How to turn or remove the signal converter) in the Handbook.
• Change the level of the tank contents until you have level reference point 1 (ref_pt1 ref_pt1 ref_pt1 ref_pt1). Use the
test device to make sure that you have level reference point 1. We recommend that the
location of this point is 33% of the probe length from the bottom of the probe.
• Measure the level at reference point 1 with the reference device (refer to "Equipment needed"
on page 22). Record the value (meas_pt1 meas_pt1 meas_pt1 meas_pt1).
• Change the level of the tank contents until you have level reference point 2 (ref_pt2 ref_pt2 ref_pt2 ref_pt2). Use the
test device to make sure that you have level reference point 2. We recommend that the
location of this point is 66% of the probe length from the bottom of the probe.
• Measure the level at reference point 2 with the reference device (refer to "Equipment needed"
on page 22). Record the value (meas_pt2 meas_pt2 meas_pt2 meas_pt2).
• End of the procedure.
The tolerance is ±3 mm / 0.12¨ in reference conditions. If the difference between ref_pt1 ref_pt1 ref_pt1 ref_pt1 and
meas_pt1 meas_pt1 meas_pt1 meas_pt1 and between ref_pt2 ref_pt2 ref_pt2 ref_pt2 and meas_pt2 meas_pt2 meas_pt2 meas_pt2 agrees with the safety loop tolerance, then the
results of the test are satisfactory. If the 2 values do not agree with the tolerance, then the
results of the test are unsatisfactory. To change the device settings to get satisfactory results,
speak to the supplier.
For more data about reference conditions, refer to SIL-specific technical data on page 29.
CAUTION!
Make sure the the accuracy of the calibrated device agrees with the safety loop requirement. The
accuracy of the device must also agree with the reference conditions given in the "SIL-specific
technical data" section.