Function Group Epd Parameter - Endress+Hauser Proline Promag 55 Operating Manual

7 Block BASIC FUNCTION
46
7.2.2

Function group EPD PARAMETER

⇒
BASIC FUNCTION G
BASIC FUNCTION
EMPTY PIPE DET. Flow cannot be measured correctly unless the measuring tube is completely full. This
(6420) status can be monitored at all times with the Empty Pipe Detection function. To do this,
the empty pipe detection (EPD, empty pipe detection by means of EPD electrode) can be
activated in this function:
Options:
OFF
ON STANDARD
Factory setting:
OFF
!
• The option ON STANDARD is not available unless the sensor is equipped with an EPD
• The default setting for the EPD function when the device is delivered is OFF. The
• The devices are already calibrated at the factory with water (approx. 500 µS/cm).
• The adjustment coefficients must be valid before you can switch on the EPD function.
• If there are problems with the adjustment, the following error messages appear on the
Notes on empty pipe detection (EPD)
• Flow cannot be measured correctly unless the measuring tube is completely full. This
• An empty or partially filled pipe is a process error. A default factory setting defines that
• A plausibility check of the adjustment values will only be executed by activating the
Response to partially filled pipes
If the EPD is switched on and responds to a partially filled or empty pipe, the notice
message "EMPTY PIPE" appears on the display. If the pipe is partially empty and the EPD
is not switched on, the response can vary in identically configured systems:
• Flow reading fluctuates
• Zero flow
• Excessively high flow values
Device Functions Proline Promag 55 FOUNDATION Fieldbus
FOUNDATION FIELDBUS GGA
⇓
PROCESS PARAMETER
Function description
→
PROCESS PARAMETER
Note!
electrode.
function must be activated as required.
If the conductivity of certain fluids deviates from this reference, empty pipe/full pipe
adjustment must be performed again on site (see Function EPD ADJUSTMENT (6481)
on page 48).
If these coefficients are not available, the function EPD ADJUSTMENT (see Page 48)
is displayed.
screen:
– ADJUSTMENT FULL = EMPTY:
The adjustment values for empty pipe and full pipe are identical. In such instances,
empty pipe adjustment/full pipe adjustment must be carried out again.
– ADJUSTMENT NOT OK:
Adjustment is not possible as the fluid conductivity values are outside the permitted
range.
status can be monitored at all times with the EPD function.
a notice message is issued and that this process error has no effect on the outputs.
empty pipe detection. If an empty or full pipe adjustment is performed when empty
pipe detection is active, the empty pipe detection has to be deactivated and activated
again after finishing the adjustment in order to start the plausibility check.
⇒
GIA CONFIGURATION
⇓
EPD PARAMETER
→
EPD PARAMETER
Endress+Hauser
640
642