Endress+Hauser Proline Promag 10, Operating Instructions Manual

Page: 107 / 124

PROline Promag 10 11 Description of Device Functions
Hauser 107
EPD MODE Use this function to activate Empty Pipe Detection (EPD).
Options:
OFF
ON (Empty Pipe Detection)
Factory setting:
OFF
!
Note!
• The ON option is not available unless the sensor is equipped with an EPD
electrode.
• The default setting for the EPD function when the device is delivered is OFF.
The function must be activated as required.
• The device is calibrated at the factory with water (500
µ
S/cm). If the
conductivity of certain fluids deviates from this reference, empty pipe/full
pipe adjustment (see EPD ADJUSTMENT function on Page 107) must be
performed on site.
• The adjustment coefficients must be valid before switching on the function.
If they are not available the EPD cannot be switched on.
• The following alarm messages might appear on the display in the event of
switched on EPD and additional incorrect adjustment:
– ADJUSTMENT FULL = EMPTY: the adjustment values for empty pipe and
full pipe are identical.
– ADJUSTMENT NOT OK: adjustment is not possible as the fluid
conductivity values are outside the permitted range.
In such instances, empty pipe adjustment/full pipe adjustment must be
carried out again .
Notes on Empty Pipe Detection (EPD)
• Flow cannot be measured correctly unless the measuring pipe is
completely full. This status can be monitored at all times by means of the
EPD.
• An empty or partially filled pipe is a process error. A default factory setting
defines that a notice message is issued and that this process error has no
effect on the outputs.
• The EPD process error can be output via the configurable status output.
Response to partially filled pipe
If the EPD is switched on and responds to a partially filled or empty pipe, the
notice message “EMPTY PIPE” appears on the display and zero flow is
indicated.
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
EPD ADJUSTMENT Use this function to activate adjustment for an empty or full measuring tube.
Options:
OFF
EPD FULL PIPE ADJUST
EPD EMPTY PIPE ADJ.
Factory setting:
OFF
Procedure for EPD empty pipe / full pipe adjustment
1. Empty the piping.
2. Start empty pipe adjustment: select “EMPTY PIPE ADJUST” and press
F
to confirm.
3. Fill piping with fluid.
4. Start full pipe adjustment with fluid: Select “FULL PIPE ADJUST” and press
F
to confirm.
5. When the adjustment procedure is complete, switch on the detection
system: Select “EPD” (flashing) and press
F
to confirm.
Function description PROCESS PARAMETER