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Commissioning
8.2 Recommendation for the selection of parameters
8.2.5
Response time via parameter P.13
Time that has to pass before the value exceeding or falling below the limits causes an alarm
to be output or an alarm to be reset. The response time can be used to optimize the
signaling performance of the diagnostics unit. It can prevent a false alarm being triggered for
solids temporarily caught in the valve.
Note
The response time setting applies to all measurement channels for incoming and outgoing
signals.
8.2.6
Alarm storage via parameter P.14
The alarm storage function can be used to prevent an alarm disappearing once triggered.
This enables self-correcting to still be identified once the measured value has fallen again.
This function is also interesting for the case when the pump was disconnected. When the
pump is stopped there are no measured values available, but the alarms triggered during
operation are still available.
8.2.7
Application via parameter P.39
This parameter is used for the optimal adjustment of the signal processing of the diagnostics
unit to the design specifics of the pump. See table "Selection of signal processing
(Parameter P.39)"
Table 8- 1
Selection of signal processing (Parameter P.39)
Signal processing
Design features of the
pump
Instrumentation:
Number and position of
the sensors
Scope of the
diagnostics
See also
Closing angles of suction valves P.45 to P.49 (Page 83)
82
Type 1
(poor acoustic coupling of the
valves)
Valves are offset from the head
and the seal between is a non-
ferrous flat gasket.
One sensor per valve, direct on
the valve
Leaks from suction and/or
pressure valves are identified
separately.
Type 2
(average acoustic coupling of
the valves)
Valves are offset from the
head and the seal between is
a ferrous flat gasket.
One sensor per valve, direct
on the valve
Leaks from suction and/or
pressure valves are identified
separately.
SITRANS DA400 for oscillating positive displacement pumps
Operating Instructions, 09/2008, A5E00841120-03
Type 3
(high acoustic coupling of the
valves within a pump head)
Pressure and suction valves
are integrated in the head.
One sensor per head
between the valves
Leaks from suction and/or
pressure valves are
identified but localization of
the defective valve is not
possible.
At least one valve on the
pump must be intact.
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