Siemens SITRANS DA400 Operating Instructions Manual page 52

Starting up
8.1 Overview
Procedure
1. Turn on the auxiliary power.
2. Commission the pump(s).
3. Set a valid value for each channel used. Leave unused channels at the factory setting or
Note
After turning on the auxiliary power, the device performs a self-test "SELF Test". After
completion of the self-test, approximately 5 seconds, the device is ready to use. Acoustic
channel 1 "1/SO1" is shown in the digital display.
Recommendations
Observe the display for each channel individually for a few minutes and determine an
average sound level and the maximum sound level. Low levels (<20) indicate that the device
is functioning properly.
The measured values cannot be assigned a physical unit; the measured value is shown in
the display as a linear figure between 0 and 9999. Where:
0
9999
In general, for intact pump values, i.e. no leaks, the measured value should equal 0 or
slightly more.
Use of the pre-alarm
If you are interested in the development of damage, the frequency and time intervals allow
the pre-alarm to be used as a statistical variable to assess the condition. Select the limit
value such that it performs the task you want it to.
Use of the main alarm
If the set limit is exceeded, the major alarm gives the report that there is a cavitation to which
the leak can be traced.
A leak can be caused by:
• Damaged valve seats
• Damaged valve body
• Closing function is impeded
• Solid matter stuck in valve
In certain cases, depending on the design, mode of operation and the pumped medium, self-
cleaning effects or self-correcting effects can occur, which cause the fault to disappear.
8-2
"oFF".
No connector level recorder is detected.
Maximum sound level
SITRANS DA400 with protection against explosion
Operating Instructions, 02/2006, A5E00684661-01