Operating Instructions FLOWSIC100
Gas Velocity Monitor
Product Description
8012513/03-2008 © SICK MAIHAK GmbH · Germany · All rights reserved 41
2.4.3 Response Time
The response time is the time taken by the measuring device to reach 90 % of the end value
after a sudden change in the measured value (see Fig. 2.25).
Typical: 60 ... 90 s The response time can be set to a value in the range 1...300 s. Setting a higher response
time (typically: 60...90 sec.) provides better attenuation of transient fluctuations in the
measured value and interference to produce a "smoother" output signal.
A special response time is used to measure the gas velocity and gas temperature. The
response time of the volumetric flow is identical to that of the gas velocity.
Fig. 2.25: Response time
Note: The response time should be regarded as a guide value. If the signal quality of the ultrasonic
pulses is poor, the FLOWSIC100 requires more measured values to produce an output
signal of the same accuracy. As a result, the response time is higher than the set time
(within certain limits).
10 20 30 40 50 60 70 80 90 100
100
98
96
94
92
90
88
86
84
Measured value
in %
Measured value with response time
Process change
t in s
90% of the peak
Response time
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