Endress+Hauser promag 31, Operating Manual

Page: 8 / 60

1.4 Design of the measuring system
Special points in the non fiscal use
•
After the official calibration inspection of the measuring system, the clutch of the
leaded screw (Electronics compartment, Diagram) is sealed. Operation of this
measurement system with these DIP switches (page 33) or above the displays keys
(page 36) is not possible afterwards.
•
After every application of the power supply, also with the first service inspection,
“Error” flashes on the display, as an indication of voltage drop. The system remains
in normal measurement mode and the status output is not activated. The same
applies to failure mode, that happens sporadically whilst in service. The flashing dis-
play section is deleted by activating the auxiliary input.
•
The system totalises bidirectionaly, during which the pulse and current output
remains unidirectional.
•
In fiscal use the periodical electrode cleaning is not possible.
•
The auxiliary input, in contrast to “normal” use, is configured to suspend for the
second stage of interuption on the display like for the trigger of the display tests.
A measuremement calculation under pressure or the interuption of the totalisers is
not possible through the auxiliary inputs.
•
Status output and auxiliary input must be wired by the user of the system.
Cable entry
Measuring
electrodes
Reference electrode
Screw cover of electronic
compartment (6 parameters can
be set here with internal miniature
switches)
Option: local display
Empty pipe
detection electrode
Outputs*
Current output
active
galvanically separated
0/4...20 mA
R
L
≤
700
Ω
Pulse output Open Collector, passive
galvanically separated
0...400 Hz
Status output Open Collector, passive
galvanically separated
configurable for:
•
output of system or process errors
•
detection of the direction of flow (not available with fiscal metering
measurement system)
Auxiliary input The auxiliary voltage to be applied
to activate the function is in the region of 3...30 V DC
•
External reset in case of error. (Reset-button must be supplied by the end
customer)
•
Self test function through the displays has a 10 second duration
* Technical data: see Chapter 6
Sensor
Screw cover
Terminal compartment
Power supply*
85...260 V AC
45...65 Hz
20... 55 V AC
16... 62 V DC
b
a02
8y
0
4
Fig. 4
1. System Description Promag 31
8 Hauser