Endress+Hauser Proline Promag 55 PROFIBUS PA, Руководство по эксплуатации

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Commissioning Proline Promag 55 PROFIBUS PA
96 Hauser
6.9 Adjustment
6.9.1 Empty-pipe/full-pipe adjustment
Flow cannot be measured correctly unless the measuring tube is full. This state can be permanently
monitored by means of empty pipe detection (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 (BA125D):
• EPD ADJUSTMENT (6481)
→
Carrying out the adjustment.
• EPD (6420)
→
Switching on and off EPD
• EPD RESPONSE TIME (6425)
→
Input of the response time for EPD
!
Note!
• The EPD function is not available unless the sensor is fitted with an EPD electrode.
• The devices are already calibrated at the factory using water (approx. 500
μ S/cm). If the liquid
conductivity differs from this reference, empty-pipe/full-pipe adjustment has to be performed
again on site.
• The default setting for the EPD function when the devices are delivered is OFF; the function must
be activated if required.
Performing empty-pipe and full-pipe adjustment (EPD)
1. Select the appropriate function in the function matrix:
HOME
→
F
→
R
→
BASIC FUNCTION
→
F
→
R
→
PROCESSPARAMETER
→
F
→
R
→
ADJUSTMENT
→
F
→
EPD ADJUSTMENT
2. Empty the piping. For EPD empty-pipe adjustment, the wall of the measuring tube should be
wetted with fluid.
3. Start empty-pipe adjustment: Select "EMPTY PIPE ADJUST" and confirm by pressing
F
.
4. After empty-pipe adjustment, fill the piping with fluid.
5. Start full-pipe adjustment: Select "FULL PIPE ADJUST" and confirm by pressing
F
.
6. Having completed the full-pipe adjustment, select the "OFF" setting and exit the function by
pressing
F
.
7. Now select the "EPD" function (6420). Switch on the empty-pipe detection by selecting
"ON STANDARD" and confirm by pressing
F
.
"
Caution!
The adjustment coefficients must be valid before you can activate the EPD function. If adjustment
is incorrect the following messages might appear on the display:
• ADJUSTMENT FULL = EMPTY
The calibration values for empty pipe and full pipe are identical. In such cases 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.