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Gas- and Steam Flowcomputer
DigiFlow 515
Operating Manual
36
11.2 Control of a Sensor–Purge–Unit
The
DigiFlow 515
takes about this option the time control of the solenoid valves of a Sensor–Purge–Unit.
This serves the freeing of the drillings of the ITABAR-open flow probes, which slowly lean on themselves in a
polluted medium, by means of compressed air. Most times the D.P.-transmitter must be uncoupled from sen-
sor before. This happens about solenoid valve blocks. During the flush the transmitter works not and no flow
signal therefore is created, the quantity determination wouldn't be correct there. The flow signal therefore is
held in the computer during the flush on the last value before the flush. The summation is therefore roughly
correct furthermore.
During the parameter setting of the flow computer shall feed in three times.
•
1. Purging time distance
t
a
: Time between two purgings. Setable from 10min to 31d:23h:50min. This time
starts after starting up the calculator or after reconfiguration.
•
2. Purging time
t
s
: Time of purging the probe. Setable from 1s to 999s.
•
3. Hold on time
t
n
: Time lasting the measurement held still is although the transmitter is coupled again.
This serves, that a stable difference pressure signal can be build up again. Setable from 0s to 99s
11.2.1 Time diagram Sensor–Purge–Unit
Input Hold
Relay No. 1
Relay No. 2
t
a
5s
t
s
5s
t
n
t
a
11.2.2 Functional description:
If the time between purging
t
a
has passed puts relays #1 on and the measurement of the flow input is held.
Relay #2 becomes excited after 5s. Both relays remain excited for the purging time
t
s
now. After sequence
of operations relay #2 releases and after another 5ses relays #1 also. For the duration of the settle time
t
n
however the measurement furthermore is in the calculator held. The current flow signal gets weighted first
after this again.
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