Proline Promag 55 FOUNDATION Fieldbus
Commissioning
Hauser
75
6.4
Adjustment
6.4.1
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:
• EPD ADJUSTMENT (6480)
→
Carrying out the adjustment.
• EMPTY PIPE DET. (6420)
→
Switching EPD on and off
• 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 fluid
conductivity differs from this reference, empty pipe/full pipe adjustment must 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.
• The EPD process error can be output by means of the configurable relay outputs.
Performing empty pipe and full pipe adjustment (EPD)
1.
Select the appropriate function in the function matrix:
HOME
→
F
→
R
→
BASIC FUNCTIONS
→
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 EMPTY PIPE DET. 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.
