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Troubleshooting / FAQs
8.1
General information
Incorrect and unstable measurements, especially at low flows, are typically a result of an
unstable zero point due to:
● Incorrect installation
● Air bubbles in the liquid
● Vibrations/Cross talk
● Solid particles in the liquid
In the following a 4 steps guide to troubleshooting is provided:
Step 1
Step 2
Step 3
Step 4
The guide will enable you to trace the reason for incorrect measurements and to improve the
application.
8.2
Step 1: Inspecting the application
The first step in the troubleshooting procedure is to check for some easily resolved
problems.
Check that:
● Sensor and SENSORPROM unit correspond (serial numbers)
● The sensor is properly installed.
● The sensor is located in a vibration-free position. Vibrations can disturb the sensor and
● The sensor is filled with liquid and liquid only. Air or gas bubbles in the liquid cause
SITRANS F C MC2
Operating Instructions, 10/2009, A5E02154544-02
Preliminary application inspection
Zero point adjustment
Measurement error calculation
Application improvement
therefore cause measurement error.
instability and can result in measurement errors.
Note
The liquid must be homogeneous in order to measure with high accuracy. If the liquid
contains solid particles of greater density than the liquid, then these solids can
precipitate, especially at low flow rates, which will cause instability in the sensor and lead
to measurement errors.
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