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Reference, Installation, and Operations Manual Section 6: Meter operation
3-9000-743 Rev S June 2013
Analog (Current) output 221
6.2.3 Analog (Current) output
When the Option Board is used, the Daniel Mark III Ultrasonic Gas Flow Meter provides a
configurable 4-20 mA analog output signal. For the following discussion, the minimum output
is assumed to be 4 mA and the maximum output is assumed to be 20 mA although the actual
output range is [3.5, 21 mA].
Refer to Section 5.6.8 for information on configuring this output using the Daniel MeterLink
Field Setup Wizard. The associated configuration data points can also be configured via the
Daniel MeterLink
Edit/Compare Configuration screen.
With the Expansion Board with HART® is installed, an additional Analog Output is HART®
capable that can be configured as a conventional analog output or used to communicate with
the meter via a 375 Field Communicator or using AMS™ Suite software. Refer to Section 3.4 and
Daniel HART Field Device Specification for Daniel Gas Ultrasonic Flow Meters Manual
(P/N 3-9000-754) for analog output configuration details.
Analog output data content
The analog output is configured via the AO1Content data point to represent uncorrected flow
rate (0), corrected flow rate (1), average flow velocity (2), average sound velocity (3), energy
rate (4), or mass rate (5).
Analog output data flow direction
The analog output represents the data content (selected via AO1Content with the Expansion
Board or AO2Content with the Expansion Board with HART® installed) when the flow direction
is in the selected direction (selected via AO1Dir with the Expansion Board or AO2Dir with the
Expansion Board with HART® installed).
The options are:
• R
EVERSE (0): the selected data content is output when the flow is in the reverse direction.
• F
ORWARD (1): the selected data content is output when the flow is in the forward direction.
• A
BSOLUTE (2): the selected data content is output regardless of the flow direction.
Analog output value data point
The analog output value is readable via the AO1Output data point with the Expansion Board or
AO2Output data point (with the Expansion Board with HART® installed).
Volumetric flow rate content output scaling
When the analog output represents either uncorrected or corrected volumetric flow rate,
selected via the AO1Content or AO2Content (with the Expansion Board with HART® installed)
data point(s), then the full-scale volumetric flow rate is specified via the
AO1FullScaleVolFlowRate data point or via AO2FullScaleVolFlowRate with the Expansion
Board with HART® installed. This is the volumetric flow rate that corresponds to the maximum
current output (20 mA). The minimum current output (4 mA) corresponds to zero flow rate. The
analog output is forced to 3.5 mA when the selected data content is invalid.