Promag 53 PROFIBUS DP/PA Commissioning
Endress+Hauser 125
6.9 Adjustment
6.9.1 Empty-pipe/Full-pipe adjustment
Flow cannot be measured correctly unless the measuring pipe is completely full.
This status can be monitored at all times with the Empty Pipe Detection function:
• EPD = Empty Pipe Detection (with the help of an EPD electrode)
• OED = Open Electrode Detection (Empty Pipe Detection with the help of the measuring
electrodes, 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 are contained in the separate "Description of Device Functions" manual:
• EPD/OED ADJUSTMENT (6481) Carrying out the adjustment.
• EPD (6420) Switching on and off EPD/OED.
• EPD RESPONSE TIME (6425) 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 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 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 relay outputs.
Performing empty-pipe and full-pipe adjustment (EPD/OED)
1. Select the corresponding function in the function matrix:
HOME
F
R
BASIC FUNCTIONS
F
R
PROCESSPARAMETERS
F
R
ADJUSTMENT
F
EPD/OED ADJUSTMENT
2. Empty the piping. In case of an EPD adjustment, the wall of the measuring tube should
be wetted 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 (6420). 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:
• ADJUSTMENT FULL = EMPTY
The adjustment values for empty pipe and full pipe are identical. In such cases, the empty-
pipe/full-pipe adjustment must be repeated!
• ADJUSTMENT NOT OK
Adjustment is not possible because the fluid’s conductivity is out of range.
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