Proline Promag 51
6 Commissioning
Hauser
73
6.1.3
Special features of custody transfer measurement
Approved Promag 51 flowmeters differ from non-approved flowmeters as follows:
• After official approval or leaded sealing, configuration can no longer be carried out using the local
display.
• Approved flowmeters totalize bidirectional flow, i.e. all outputs consider flow shares in positive
(forward) and negative (backward) flow direction.
• The wiring of the status output and status input must be done by the user of the system.
• Diameters DN 700...2000 can also be approved.
However, measuring points with these diameters are not normally subject to metrological
regulations (Q
max
= 2 x Q
n
> 2000 m
3
/h).
• Instruments suitable for custody transfer and for certifying at a later date are normally removed
from the piping.
Function settings:
Certain function settings are to be stated when ordering a Promag 51 flowmeter. For the parameters
marked with “ * ”, delivery is made with the factory settings if no corresponding order data is given.
• Nominal flow rate Q
n
• Metrological class
• Full scale value, current output *
• Current range *: 0/4...20 mA
• Pulse value
Page 24 ff. (if a pulse output for custody transfer mode is used)
For custody transfer measurement, settings for the functions below are fixed:
• Totalizer
→
7-digit, without decimal point
• Low flow cut-off
→
always activated (VOLUME FLOW)
• In contrast to “normal” operation, the status input is only configured for resetting alarm messages
on the display (see below) or else for activating the display test function. Creep suppression or
resetting the totalizer via the status input is not possible in custody transfer mode.
Error messages on the display
In custody transfer mode, all system and process errors are classified and treated as “fault messages”.
Error messages appear on the local display and can be output and evaluated - given the appropriate
configuration - also via the status output.
On the local display, errors are indicated by flashing, i.e. alternating with the measured value
display. The error display can only be reset by means of a pulse via the status input.
!
Note!
Detailed information on errors for all outputs of Promag 51 can be found on Page 92.
Switching on power supply in custody transfer mode:
After each application of the power supply, including initial start-up, the system error “NETWORK
FAILURE” flashes on the local display. The device continues to measure normally despite this
display. The fault message can be deleted via the status input.
Содержание Proline Promag 51
Страница 4: ...QUICK SETUP commissioning Proline Promag 51 4 Endress Hauser...
Страница 10: ...1 Safety instructions Proline Promag 51 10 Endress Hauser...
Страница 52: ...4 Wiring Proline Promag 51 52 Endress Hauser...
Страница 80: ...7 Maintenance Proline Promag 51 80 Endress Hauser...
Страница 104: ...9 Trouble shooting Proline Promag 51 104 Endress Hauser...
Страница 122: ...11 Index Proline Promag 51 122 Endress Hauser...
Страница 124: ...www endress com worldwide BA080D 06 en 03 05 50101924 FM SGML6 0...