Endress+Hauser Proline Promag 51, Руководство по эксплуатации

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Proline Promag 51 6 Commissioning
Hauser 77
6.4.2 Empty-pipe/full-pipe adjustment
Flow cannot be measured correctly unless the measuring tube is completely full. This status can be
permanently monitored using the Empty Pipe Detection:
• EPD = Empty Pipe Detection (with the help of an EPD electrode)
• OED = Open Electrode Detection (Empty Pipe Detection with the help of the measuring electro-
des, if the sensor is not equipped with an EPD electrode or the orientation is not suitable for using
EPD).
"
Caution!
A detailed description and other helpful hints for the empty-pipe/full-pipe adjustment procedure
can be found in the separate “Description of Device Functions” Manual:
• EPD/OED ADJUSTMENT
→
Carrying out the adjustment.
• EPD
→
Switching on and off EPD/OED.
• EPD RESPONSE TIME
→
Input of the response time for EPD/OED.
!
Note!
• The EPD function is not available unless the sensor is fitted with an EPD electrode.
• The devices are already calibrated at the factory with water (approx. 500
µ
S/cm).
If the fluid conductivity differs from this reference, empty-pipe/full-pipe adjustment has to be
performed again on site.
• The default setting for EPD/OED when the devices are delivered is OFF; the function has to be
activated if required.
• The EPD/OED process error can be output by means of the configurable status output.
Performing empty-pipe and full-pipe adjustment (EPD/OED)
1. Select the appropriate function in the function matrix:
HOME
→
F
→
R
→
PROCESS PARAMETER
→
F
→
R
→
EPD/OED ADJUSTMENT
2. Empty the piping. In case of an EPD adjustment, the wall of the measuring tube should be wet-
ted with fluid for the adjustment procedure but this is not the case with an OED adjustment.
3. Start empty-pipe adjustment: Select “EMPTY PIPE ADJUST” or “OED EMPTY ADJUST” and
press
F
to confirm.
4. After empty-pipe adjustment, fill the piping with fluid.
5. Start full-pipe adjustment: Select “FULL PIPE ADJUST” or “OED FULL ADJUST” and press
F
to confirm.
6. Having completed the adjustment, select the setting “OFF” and exit the function by pressing
F
.
7. Now select the “EPD” function. Switch on Empty Pipe Detection by selecting the
following settings:
– EPD
→
Select ON STANDARD or ON SPECIAL and press
F
to confirm.
– OED
→
Select OED and confirm with
F
.
"
Caution!
The adjustment coefficients must be valid before you can activate the EPD/OED function.
If adjustment is incorrect the following messages might appear on the display:
– FULL = EMPTY
The adjustment values for empty pipe and full pipe are identical. In cases of this nature
you
must repeat empty-pipe or full-pipe adjustment!
– ADJUSTMENT NOT OK
Adjustment is not possible because the fluid’s conductivity is out of range.
Current output: active/passive
The current output is configured as “active” or “passive” by means of various jumpers on the
I/O board.