Endress+Hauser PROline promag 53 - Empty-Pipe;Full-Pipe Calibration

PROline Promag 53 6 Commissioning
Endress+Hauser 91
6.2.5 Empty-pipe/full-pipe calibration
Flow cannot be measured correctly unless the measuring tube is full. This status can be
monitored at all times with the Empty Pipe Detection function (EPD) resp. with the Open
Electrode Detection function (OED).
The EPD/OED function cannot be activated until after empty/full pipe calibration has
been performed. This adjustment procedure is described below.
!
Note:
• The EPD function is not available unless the sensor is fitted with an EPD electrode.
• The sensor is calibrated at the factory with water, i.e. at approximately 500 µS/cm. If
the fluid conductivity differs from this reference, empty pipe/full pipe calibration 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 out-
puts.
Response to partially filled pipe
If EPD/OED is on and trips in response to a partially filled or empty measuring tube, the
message “EMPTY PIPE” appears on the local display.
The EPD/OED process error is defined at the factory as a “Notice message” and has no
effect on the outputs of the measuring device (see Page 67).
If the pipe is partially filled or empty and EPD/OED is not on, response can vary in
identically configured systems:
• Flow reading fluctuates
• Zero flow
• Excessively high flow readings
Performing empty-pipe and full-pipe calibration (EPD/OED)
!
1. Select the appropriate function in the function matrix:
HOME → F → R → BASIC FUNCTIONS → F → R → PROCESSPARA-
METER → F → R → ADJUSTMENT → F → EPD/OED ADJUSTMENT
2. Empty the piping. Make sure that the wall of the measuring tube is wetted with fluid
for the calibration procedure.
3. Start empty pipe calibration:
Select “EMPTY PIPE ADJUST” and press F to confirm.
4. Fill the pipe with fluid.
5. Start full pipe calibration with the fluid at a standstill:
Select “FULL PIPE ADJUST” and press F to confirm.
6. Once calibration is completed, switch EPD/OED on → Select “ON” (flashing) and
press F to confirm.
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Caution:
The calibration coefficients must be valid before you can activate the EPD/OED
function. If calibration is incorrect the following messages might appear on the
display:
– FULL = EMPTY
The calibration values for empty pipe and full pipe are identical.
– ADJUSTMENT NOT OK
Calibration is not possible because the fluid's conductivity is out of range.
In cases of this nature you must repeat empty-pipe or full-pipe calibration!