Rosemount 8712C - Auxiliary Output and Totalizer Functions

Model 8712C/U/H Magnetic Flowmeter Transmitters
4-12
Conversion Number
The special units conversion number is used to convert base units to
special units. For a straight conversion of volume units from one to
another, the conversion number is the number of base units in the new
unit. For example, if you are converting from gallons to barrels and
there are 31 gallons in a barrel, the conversion factor is 31.
Base Time Unit
Base time unit provides the time unit from which to calculate the
special units. For example, if your special units is a volume per minute,
select minutes.
User-Defined Flow Unit
User-defined flow unit is a format variable that provides a record of the
units to which you are converting. The HART Communicator and
Model 8712C/U/H will display a special units designator as the units
format for your primary variable. The actual special units setting you
define will not appear. Four characters are available to store the new
units designation.
Example
To display flow in barrels per hour, and one barrel of beer is equal to
31.0 gallons, the procedure would be:
Set the Volume Unit to BARL.
Set the Base Volume Unit to Gallons.
Set the Input Conversion Number to 31.
Set the Time Base to Hour.
Set the Rate Unit to BR/H.
Auxiliary Output
The auxiliary output contacts (terminals 16 and 20) are software-
selectable to indicate a reverse flow or zero flow condition. The two
terminals are actually a transistor switch closure which must be
externally powered.
Reverse Flow Enable
Reverse flow enable activates the switch closure with a reverse flow. A
forward flow is defined by the proper wiring polarity and the flow
direction arrow on the flowtube. This also enables the totalizer to count
in the reverse direction.
Zero Flow
Zero flow activates the switch closure whenever the flow rate drops
below the low flow cutoff or there is a reverse flow condition.
Totalizer
Totalizer tallies the total amount of liquid or gas that has passed
through the flowmeter since the totalizer was last reset and enables you
to change the settings of the totalizer.
HART Fast Keys 1, 3, 2, 2, 3
LOI Key Aux. Function
HART Fast Keys 1, 3, 2, 2, 4
LOI Key Aux. Function
HART Fast Keys 1, 3, 2, 2, 5
LOI Key Aux. Function
HART Fast Keys 1, 4, 3, 3
LOI Key Aux. Function
HART Fast Keys 1, 1, 4
LOI Key Totalizer