Proline Promass 84F, 84M
Hauser
25
Custody transfer measurement
Promass 84 is a flowmeter suitable for custody transfer measurement for liquids (other than water) and gases.
Custody transfer variables
• Mass
• Volume
• Density
Suitability for custody transfer,
metrological control,
obligation to subsequent
verification
Promass 84 flowmeters are usually verified on site using reference measurements. Only once it has been
verified on site by the Verification Authority for legal metrology controls may the measuring device be regarded
as verified and used for applications subject to legal metrology controls. The associated seal (stamp) on the
measuring device ensures this status.
"
Caution!
Only flowmeters verified by the Verification Authorities may be used for invoicing in applications subject to
legal metrology controls. For all verification processes, both the corresponding approvals and the country-
specific requirements resp. regulations (e.g. such as the German Verification Act) must be observed. The owner
/ user of the instrument is obliged to subsequent verification.
Approval for custody transfer
The requirements of the following legal metrology authorities are taken into consideration:
•
PTB
, Germany; (www.eichamt.de)
•
NMi
, The Netherlands; (www.nmi.nl)
•
METAS
, Switzerland; (www.metas.ch)
•
BEV
, Austria; (www.bev.gv.at)
Switching on the power supply in custody transfer mode
If the device is started in custody transfer mode, for example also after a power outage, system error No. 271
"POWER BRK. DOWN" flashes on the local display. The fault message can be acknowledged or reset using the
"Enter" key or by means of the status input configured accordingly.
!
Note!
For correct measuring operation, it is not mandatory to reset the fault message.
Verification
(Example)
Type-approved measuring systems for liquids other than water are always verified at their place of deployment.
For this purpose, the facility's owner-operator must make everything available when the Verification
Authorities come to inspect and verify the system. This includes:
• Scales or container with a reading unit with a load or volumetric capacity that corresponds to the operation
of the system at Q
max
for one minute. The resolution of the scales display or the reading unit must be at least
0.1 % of the minimum measured quantity.
• Unit for removing the medium being measured after the totalizer to fill the scales or the container.
• Making a sufficient quantity of the medium being measured available. The quantity is derived from the
operation of the system. The following rule of thumb applies - quantity at:
3 × 1 minute at Q
min
,
plus 3 × 1 minute at ½ Q
max
,
plus 3 × 1 minute at Q
max
,
plus adequate quantity in reserve.
• Approval certificates
!
Note!
All issues should be clarified in advance with the authority responsible to ensure the successful verification of
the measuring system.
Setting up custody transfer mode
A detailed description of the "setting up custody transfer mode" process is provided in the Operating
Instructions supplied with the device.
