Endress+Hauser PROMAG 33, Operating Manual

Page: 74 / 126

Function group
PROCESSING PARAMETERS
EPD
(continued)
Procedure for empty and full pipe adjustment
Note!
If Promag 33 is fitted with an EPD electrode, then the unit is already calibrated
in the factory with drinking water (500
µ
S/cm). A new empty pipe and full pipe
adjustment is to be carried out on site when liquids having different
conductivities are used.
1. Empty the piping. For the emtpy pipe adjustment to be carried out now,
the walls of the measuring tube should be wetted with liquid.
2. Start the empty pipe adjustment:
– Select “EMPTY PIPE ADJ.” and confirm with
1
.
– Set the safety prompt “PIPE EMPTY? [NO]” with
6
to [YES] and confirm
with
1
. Empty pipe adjustment is now started and the message “EPD
ADJUSTMENT RUNNING” is shown on the display.
3. Fill the piping with fluid.
4. Start the full pipe adjustment with the fluid stationary:
– Select “FULL PIPE ADJUST” and confirm with
1
.
– Set the safety prompt “PIPE FULL? [NO]” with
6
to [YES] and confirm
with
1
. Full pipe adjustment is now started and the message “EPD
ADJUSTMENT RUNNING” is shown on the display.
5. Switch on the Empty Pipe Detection after the adjustment
→
Select “ON”
and confirm with
1
.
Note!
The EPD function can only be switched on if an empty or full pipe
adjustment has been successfully carried out. If the adjustment is not
successful then the following alarm messages can appear on the display:
– A: EPD ADJUSTMENT VALUES MISSING:
The EPD function is switched on, but an empty resp. a full pipe
adjustment has not been carried out yet.
– A: EPD ADJUSTMENT FULL = EMPTY:
The EPD function is switched on, but the values for full and empty
pipe are identical.
– A: EPD ADJUSTMENT FULL <=> EMPTY:
The EPD function is switched on, but the adjustment did not take place
with full or empty pipe.
– A: EPD ADJUSTMENT NOT POSSIBLE:
An empty pipe adjustment is not possible because the conductivity of
the fluid is outside the permissible range.
In such cases the empty or full pipe adjustment must again be carried out!
EPD RESPONSE
TIME
The response time of Empty Pipe Detection can be selected by the user to suit
his process conditons. An alarm is not given until this response time has
expired. Momentary air bubbles in the measuring tube are then not interpreted
as a partial filling of the pipe.
Note!
This function is only available if the Empty Pipe Detection is switched on
(EPD
→
ON).
6
1 s – 2 s – 5 s – 10 s – 30 s – 60 s
Note!
Note!
Note!
6 Description of Functions Promag 33
74 Hauser