128 Micro Motion Series 1000 and Series 2000 Transmitters
Custody Transfer
11.7.1 Transmitter outputs in secure mode
The following outputs are approved in secure mode:
• Frequency output for the transmission of volume or mass information, and for fault indication
(available only on Models 2700 CIO and 2500 CIO)
• RS-485 output for connection to a host approved by the local weights and measures authority
(available only on Models 2700 AN and 2500 CIO, and only with NTEP)
• 4–20 mA output for the transmission of density information. This output can support the
reading of pressure information when using HART Bell 202.
• Local display (if the transmitter has a display) can indicate totals, inventories, mass flow,
volume flow, and density.
11.7.2 Operating the totalizers in secure mode
The following characteristics apply to totalizers while the transmitter is in secure mode:
• It is possible to reset the mass and volume flow totalizers when in secure mode, but this is
possible only when the flow rate is zero. The inventories cannot be reset. Resetting any one
total will reset all the totals.
• The methods available for resetting the totalizers are configured while in security breach mode
(see Section 11.6.2). The resetting methods cannot be changed while in secure mode.
• The totalizers cannot be stopped when the transmitter is in secure mode.
11.7.3 Displaying totalizer and inventory values
If NTEP compliance is selected, the display handles both totalizer and inventory values in the usual
manner.
If OIML compliance is selected, the display handles inventory values in the usual manner, but applies
special handling to the presentation of large totalizer values:
• The decimal point position is fixed to the precision configured for the corresponding display
variable (see Section 8.14.6).
Note: The display does not allow the comma character, so the period character is always used to
represent the decimal point.
• When the maximum value for the configured display precision is reached, all the digits roll
over from 9 to 0, but the decimal point does not move and the number of digits on the display
does not increase. For example, the value
99999.999 rolls over to 00000.000.
• When the value on the display rolls over, the internal totalizer value is also reset to 0.
• The mass and volume totalizers will not necessarily roll over together.
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