FLOWSIC100 Operating Instructions
Gas Velocity Monitor
Product Description
42 © SICK MAIHAK GmbH · Germany · All rights reserved 8012513/03-2008
2.5 Check Cycle
You can trigger a check cycle on the FLOWSIC100 to test whether the device components
are functioning correctly. The check cycle can also be triggered automatically (you can set
the interval using the SOPAS ET operating software) and/or via a binary input (see Section
2.3.3).
Any deviations from the normal behavior are output as a warning or error.
If a malfunction is present or a warning is displayed, you can trigger a check cycle manually
to locate the cause of the problem (see Service Manual).
The check cycle consists of a zero-point check and span test. The check values can be
output via the analog output. The progress of the check cycle is output on the corresponding
relay and, if the LCD is available, indicated by the text "Check cycle" on the display.
Notes: • If the check cycle is not output on the analog output, the last measured value is output
for the duration of the check cycle (approx. 20 s if the check runs correctly).
• To trigger a zero-point check and span test, as well as a check cycle via a binary input, a
contact must be closed at the corresponding terminals for at least 2 s.
• Automatic check cycles are carried out periodically from the parameterized time interval,
until the interval setting is changed (or the device is reset). After a device reset (or power
failure), the check cycle begins at the defined time when the device resumes operation.
• If the automatic check cycle and check cycle triggered via a binary input occur at the
same time, only the cycle triggered first takes effect.
2.5.1 Zero-point Check
A special circuit arrangement in the sender/receiver units ensures that the transmission
signals from the transducers can be read back instantaneously and with the original shape.
These transmission signals are received as reception signals, amplified, demodulated, and
evaluated.
If the device is operating correctly, the exact zero point must be calculated here. This check
comprises a full check of all the system components, including the transducers. A warning
is output for offsets greater than approx. 0.25 m/s (depending on the measuring distance
and gas temperature). In this case, you should check the transducers and electronic
components.
If the signal amplitude or shape does not match the expected values, the transducers or
electronic components are defective. In this case, an error message is output.
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