KROHNE OPTIFLEX 8200 C, Handbook

Page: 109 / 220

OPERATION
6
109
OPTIFLEX 8200 C/F/S
www.krohne.com 06/2018 - 4006448901 - MA OPTIFLEX 8200 R01 en
• Set Application Type Application Type Application Type Application Type to "LEVEL WITH GAS PHASE COMPENSATION".
• Enter the correct settings for your process in Epsilon R Product Epsilon R Product Epsilon R Product Epsilon R Product, Output Function I1 Output Function I1 Output Function I1 Output Function I1, Scale
4mA I1 and Scale 20mA I1.
i The device will start a process analysis.
• Is your tank partially filled or empty? Make a selection from "Partially" and "Empty".
• Give the value for the dielectric contant of the gas in the tank (Epsilon R Gas Epsilon R Gas Epsilon R Gas Epsilon R Gas) at this time. If the
tank is empty or the device has a coaxial or double rod probe, this step is ignored.
i The device starts a flange analysis.
• If the tank is partially filled, the device will find a measurement signal and show its distance
from the process connection (flange facing or thread stop) of the device. If this distance is
correct, push [
] for "YES". If this distance is not correct, push [ ] for "NO".
• The device will then do a scan (snapshot) to find and filter interference signals caused by
objects in the tank.
• Push [
^ ^ ^ ^
] to return to normal mode.
6.4.9 Thresholds and interference signals
General notes
The low-power electromagnetic signal from the device goes down the probe. The surface of the
liquid products, and objects in the tank, make reflections. These reflections go back up the probe
to the signal converter. The signal converter changes the reflections into voltage amplitudes.
Reflections from objects in the tanks are interference signals.
How thresholds work
Thresholds let the device ignore reflections with small amplitudes and monitor changes in level
and interface.
The device uses the menu items that follow:
• 2.5.4 Level Threshold 2.5.4 Level Threshold 2.5.4 Level Threshold 2.5.4 Level Threshold to set the threshold for the reflection on the top surface of the liquid
products.
• 2.5.5 Interface Threshold
2.5.5 Interface Threshold 2.5.5 Interface Threshold
2.5.5 Interface Threshold to set the threshold for the reflection on the interface between two
liquid products.
CAUTION!
If all the data collected by the device are correct, it will operate the device in gas compensation
mode and filter interference signals. If the data collected by the device is not correct, do the Auto
Auto Auto
Auto
Setup
Setup Setup
Setup procedure again and change some settings. If this problem continues, speak or write to
the manufacturer.
INFORMATION!
The device can measure the dielectric constant of gas in the tank. You can show this data on the
display screen or the device can send this data as a current output.
CAUTION!
If the device cannot measure level correctly, make sure that you do the Auto Setup procedure
with a snapshot analysis first to find and remove signal interference. If the device continues to
measure level incorrectly, change the thresholds.
For more data about snapshot, refer to the Auto Setup procedure on page 79.