Communication
30 Sensyflow
FMT700-P
42/14-42-EN
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6.1.2 Totalizer (integrator function)
This operating mode is used to determine the air mass that flows through the flowmeter sensor
during a defined measurement period that is externally triggered. The result is displayed digitally
and can be read out via the serial interface or via a 15-bit parallel interface (binary-coded,
electrically isolated) (see section 3.3).
The unit used for the totalized value is either grams or normal liters.
The measurement period (Tm) is defined by the external START / STOP signal at the REMOTE
CTRL input.
The START signal (falling edge at REMOTE CTRL input) triggers switchover to the special
operating mode and simultaneously initiates the measuring process.
The STOP signal (marking the end of the measuring process) is triggered by a rising edge at
the REMOTE CTRL input (see section 3.3).
U
external
5 ... 24 V
G00944
T
m
0 V
Fig. 21: Voltage states at REMOTE CTRL input
While this special mode is active, the REMOTE CTRL indicator (RC) to the left of the 6-digit
LED display lights up.
The 6-digit LED display is switched off and the measuring rate setting is deactivated. The
current flowrate remains constantly available at the analog output during this period (measuring
rate N = 1 = 1 ms.; see section 5.3.1).
Important
If one or more individual measured values exceeds the calibrated measuring range while the
special mode is active, all DATA BITS are set once the STOP signal is detected, as is the
DATA READY BIT.
When the device switches back to normal operation, 999999 initially appears on the display
before normal operation is resumed.
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