Promag 50
Commissioning
Hauser
73
6.5
Adjustment
6.5.1
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
electrodes, if the sensor is not equipped with an EPD electrode or the orientation is not suitable
for using EPD).
"
Caution!
Detailed information on the empty-pipe/full-pipe adjustment procedure can be found in the
"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 when the devices are delivered is OFF; the function has to be activated
if required.
• The EPD process error can be output by means of the configurable relay output.
Performing empty-pipe and full-pipe adjustment (EPD)
1.
Select the appropriate function in the function matrix:
HOME
F
R
PROCESS PARAMETER
F
R
EPD ADJUSTMENT
2.
Empty the piping:
– The wall of the measuring tube should still be wet with fluid during EPD empty pipe
adjustment
– The wall of the measuring tube/the measuring electrodes should
no longer
be wet with
fluid during OED empty pipe 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.
Switch on empty pipe detection in the EPD function:
– EPD empty pipe adjustment: Select ON STANDARD or ON SPECIAL and press
F
to confirm
– OED empty pipe adjustment: Select OED and confirm with
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:
– 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.
