Technical data

Flow meter FC01-Ex Flow meter FC01-Ex
Ex atmosphere - Definitions and mounting instructions 17 Ex atmosphere - Definitions and mounting instructions 17
If a separate relief network is preferred to the integral network, care should be taken when
processing the max. frequency of 10 Hz to ensure the energy stored in the operating coil has
dissipated by the time the counter output is reset. The time to do this should be below 40 ms,
making due consideration to switching times and pulse variations.
Typical circuit (example 2)
If a separate relief network is preferred to the integral network, care should be taken when
processing the max. frequency of 10 Hz to ensure the energy stored in the operating coil has
dissipated by the time the counter output is reset. The time to do this should be below 40 ms,
making due consideration to switching times and pulse variations.
Typical circuit (example 2)
Note:
❑ As there will be a reset pulse available at the output in the moment the supply voltage of
the FC01-Ex is applied, make sure that the counter is switched on delayed or set to zero
after it has been switched on.
Note:
❑ As there will be a reset pulse available at the output in the moment the supply voltage of
the FC01-Ex is applied, make sure that the counter is switched on delayed or set to zero
after it has been switched on.
XAS XAO
XAH
8 7654321 8 7654321 8 7654321
i
C
U
V
<36 V
inductance of the
counter drive
i
C
t
L
t
ON
t
U
C
U
V
t
zener voltage
U
C
t
ON
- switch-on time
t
L
- time constant of switch-off current
fig. 11
XAS XAO
XAH
8 7654321 8 7654321 8 7654321
i
C
U
V
<36 V
inductance of the
counter drive
i
C
t
L
t
ON
t
U
C
U
V
t
zener voltage
U
C
t
ON
- switch-on time
t
L
- time constant of switch-off current
fig. 11