
Using ProLink
®
Software with Micro Motion
®
Transmitters
73
Configure Menu: Characterize
continued
Flow calibration factor
Configure Menu:
Transmitter Outputs
Configure Menu:
Transmitter Information
Configure Menu: EventsView Menu: Status
Configure Menu:
Characterize
Configure Menu:
Transmitter Variables
8.2 Flow calibration factor
The flow calibration factor describes a particular sensor's sensitivity to
mass flow. Testing conducted in the Micro Motion flow calibration
laboratory determines the precise value of the flow calibration factor for
each sensor. (For an RFT9739, IFT9701, IFT9703, RFT9712, or
RFT9729 that is shipped without a sensor, the default value — which
must be changed — is 1.00005.13).
The first five digits and first decimal point
are the flow rate, in grams
per second, required to produce one microsecond of time shift between
velocity signals transmitted by sensor pickoff coils. In the default
calibration factor above, the first five digits and first decimal point
indicate that, for every detected microsecond of time shift, 1.0000 grams
of fluid per second flow through the sensor.
The last three digits and second decimal point
represent the
temperature coefficient for the sensor. The temperature coefficient
represents the percent change in the rigidity of the flow tubes around the
twisting axis per 100
°
C.
Sensor and transmitter
shipped together
If the sensor and transmitter were ordered together as a Coriolis
flowmeter, the correct flow calibration factor was programmed into the
transmitter at the factory and does not need to be changed.
After calibration at the factory, the value displayed in the FlowCal text
box is the same as the flow cal factor on the sensor serial number tag
and the flowmeter calibration certificate, which is shipped with the
sensor.
With a Version 3.0, 3.5, or 3.6 RFT9739, a meter factor is available,
which adjusts the flowmeter measurement without modifying the flow
calibration factor. For information on meter factors, see
Chapter 13
.
Model RE-01 Remote
Electronics Unit replaced
in the field
Model RFT9739, IFT9701, IFT9703, RFT9712, and RFT9729
transmitters use the flow calibration factor in calculating mass flow rate.
The Model RE-01 Remote Electronics Unit uses a sensor sensitivity
factor.
If an RE-01 is being replaced by another transmitter:
1. Use the following equation to derive the first five digits of the flow
calibration factor from the RE-01 flow sensitivity factor:
2. Use the appropriate value from
Table 8-1
for the last three digits of
the flow calibration factor.
1.507 Flow Sensitivity Factor
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