10 Troubleshooting
PIOX R721 10.1 Problems with the measurement
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UMPIOX_F72xV1-3EN, 2021-09-01
The display does not work at all or fails regularly.
• Check the contrast setting of the transmitter or enter the HotCode 555000 to set the display to medium contrast.
• Make sure that the correct voltage is available at the terminals. The destined transmitter voltage is indicated on the
nameplate below the outer right terminal strip.
• If the power supply is OK, the sensors or an internal component of the transmitter are defective. The sensors and the
transmitter have to be sent to FLEXIM for repair.
• If the transmitter is only connected via the USB interface, the backlight will be switched off.
An error is displayed in the status indication (symbol )
• Press to return to the main menu.
• Select the menu item Miscellaneous\System settings\Event log.
• Press ENTER.
The error message list will be displayed.
Date and time are wrong, the measured values are deleted when the transmitter is switched off.
• If the date and the time are reset or wrong or the measured values are deleted after the transmitter has been switched off
and on again, the data backup battery has to be replaced. Send the transmitter to FLEXIM.
An output does not work.
• Make sure that the outputs are configured correctly. Check the function of the output. If the output is defective, contact
FLEXIM.
10.1 Problems with the measurement
A measurement is not possible because no signal is received. An interrogation point is displayed after the
physical quantity. The LED lights red after starting the measurement.
• Make sure the sensor is correctly connected to the transmitter. The sensor must be recognized by the transmitter. The
serial number of the sensor will be displayed (see menu item Parameters\Connected transd.).
The signal is lost during the measurement.
• If there is no measuring signal after the pipe had been run empty and refilled, contact FLEXIM.
• Make sure the pipe is filled with the fluid and the sensor head is completely submerged into the fluid. The sensor can
only measure within the fluid otherwise the measurement becomes invalid. The measurement can be interrupted due to
a temporarily higher proportion of gas bubbles and solids in the fluid.
• The sensor functions according to the transmitted light principle. A turbid fluid and contaminated measurement optics
can cause a light attenuation and therefore entailing an invalid measuring signal. Check the measurement optics for
contamination.
10.2 Measuring point selection
• Avoid measuring points with deposit formation in the pipe.
• When measuring on a horizontal pipe, the sensor has to be mounted laterally on the pipe.
• The measuring point on a vertically mounted pipe has always to be filled. The fluid should flow upward.
• No gas bubbles should form (even bubble-free fluids can form gas bubbles when the fluid expands, e.g., upstream of
pumps and downstream of great cross-section enlargements).
10.3 Application-specific problems
The measuring points of the physical quantities for analysis are outside the valid range
• Check the entered value.
Turbid signals scatter the optical signal
• The measurement of fluids with a turbidity > 10000 FAU (Formazine Attenuation Units) becomes invalid.
Gas bubbles or solids present in high concentration in the fluid scatter and absorb the optical signal and thus
attenuate the measuring signal
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