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FLOWSIC100 Flare · Operating Instructions · 8013344/11L2/V 2-5/2018-10 · © SICK Engineering GmbH
Product Description
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2.4
Check cycle
The FLOWSIC100 Flare is equipped with an integrated check cycle for automatic functional
check of all device components. This check cycle is an approved tool for periodic device
inspection according to valid regulations of Continuous Emission Monitoring.
The check cycle can be triggered time-controlled (setting of interval time by means of an
operating program) and/or manually via the digital input (
from normal behavior that may occur are signaled as warnings or errors.
A check cycle initiated manually can help to localize possible error causes should a device
malfunction or a warning occur (see Service Manual).
The check cycle comprises zero point control and span test. The control values can be
output via the analog output. The sequence of a check cycle is indicated by the status
output on the corresponding relay and, if the Display module option is available,
simultaneously on the display by the clear text message "Check cycle".
2.4.1
Zero point control
With a special circuit configuration in the sender/receiver units, the send-signals of the
transducers can be read back without delay and in their original form. These send-signals
are received, demodulated and computed as receive-signals. If the device functions
correctly, the exact zero point must be calculated here. This control comprises the complete
check of all system components including the transducers. For deviations of more than
approx. 0.25 m/s (depending on active measuring path and gas temperature), a warning is
output. Transducers and electronics must be checked in this case. If signal amplitude or
form does not match the expected values, transducers or electronics are defective and an
error message is output.
●
If the check cycle is not output on the analog output, the last measured
value is output for the duration the check cycle duration (approx. 20 s in an
error-free sequence).
●
For initiation of zero point control and span test as well as a check cycle via
the digital input, a contact at the respective terminals must be closed for at
least 2 s.
●
Time-controlled check cycles start periodically according to parameter set-
ting of the desired time interval at the entered time until the time interval is
changed (or a reset is performed). If a reset is made (or there is an operat-
ing voltage failure), the check cycle starts at the time the device is put into
operation again at the set time.
●
If a time-controlled check cycle and a check cycle initiated by digital con-
tacts overlap, only the check cycle initiated first becomes effective.
