Operation
42/14-42-EN Sensyflow
FMT700-P
19
Important (Notice)
Whenever the measuring system is switched on or after a reset, the device adopts a
measuring rate of N = 100 as soon as the internal test routines have been completed.
Example:
The average mass flowrate needs to be determined using an interval of 3 seconds.
What measuring rate should be set?
3 s = 3,000 ms
N = 1 = 3 ms
Presetting counter setting
= T
= I
= N
Required interval
Duration of a single measurement
No. of individual measurements
1000
3
3000
I
T
N
Thus, the measuring rate should be set to N = 1,000 on the switch.
This means that the four-digit switch can be used to produce an average value for the mass
flowrate based on up to 9,999 individual measurements.
When a measuring rate of "0000" is selected, the measuring cycle period is just 1 millisecond
(see section 5.3.2).
To summarize:
• If a low measuring rate is set, the average is produced from a small number of individual
measurements and it is possible to measure and record dynamic processes.
• If a high measuring rate is set, the average is produced from a large number of individual
measurements and undesirable fluctuations can be eliminated.
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5.3.2 Fast measuring rate
This operating mode is for measuring very fast, dynamic processes. The measuring cycle
period is 1 ms, i.e., an updated measured value is made available at the analog outputs and at
the 12-bit parallel interface once every millisecond.
Proceed as follows to set this operating mode:
• Set the measuring rate to "0000" using the switch on the front of the supply / evaluation unit.
• Press the "SAMPLE RATE" button to accept this measuring rate. "_ _ _ _ _ _ " appears
on the display along with "FAST MODE".
Important (Notice)
If you want the device to revert to the default setting (N = 100), you need to reset it (press
RESET button) or restart it completely.
As soon as the internal test routines have been completed (during which all the indicators light
up), the measuring system starts taking measurements using the default measuring rate
setting of N = 100 again.
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