
Using ProLink
®
Software with Micro Motion
®
Transmitters
81
Configure Menu: Characterize
continued
Slug flow limits
Configure Menu:
Transmitter Outputs
Configure Menu:
Transmitter Information
Configure Menu: EventsView Menu: Status
Configure Menu:
Characterize
Configure Menu:
Transmitter Variables
The last three digits and decimal point
are the density temperature
coefficient, which represents the percent change in the elasticity of the
flow tubes around the bending axis, and the corresponding change in
tube period, per 100
°
C.
Density characterization
for IFT9701/IFT9703 and
RFT9712/RFT9729
If the sensor and transmitter were ordered together as a Coriolis
flowmeter, the density calibration factor was programmed into the
transmitter at the factory and does not need to be changed.
If the sensor or transmitter is replaced in the field, the user must
re-characterize the sensor by programming the correct density
calibration factor into the transmitter.
In density characterization, density factors are entered using one of the
methods described in
Table 8-3
. During density characterization, record
each density factor in the appropriate Transmitter Configuration
Worksheet, shown in
Appendix E
, page 183.
Table 8-3. Methods for determining IFT9701/IFT9703 or RFT9712/9729 density factors
8.5 Slug flow limits
Slug flow limits enable detection of conditions such as slug flow (such as
gas slugs in a liquid flow stream, or liquid in a gas/air flow stream).
• If fluid density goes outside a slug flow limit, all of the following occur:
• The Slug Flow indicator in the ProLink Status window switches ON
• The frequency/pulse output goes to 0 Hz
• Milliamp outputs indicating flow go to a level that corresponds to a
zero flow condition
• Flow totalization stops while density reading is outside slug flow
limits
• On field-mount transmitters, the diagnostic LED blinks once per
second (75% ON, 25% OFF)
To establish slug flow limits, enter values in grams per cubic centimeter
(g/cc), regardless of the density units established for density as a
transmitter variable.
The RFT9739 offers an additional slug flow parameter, slug duration,
which is described in
Section 10.5
, page 116.
Method 1 (preferred) Method 2* (acceptable)
Enter the 13-digit density calibration factor from the sensor
tag or calibration certificate that was shipped with the
sensor.
Perform the density calibration procedure described in
Section 14.4
, page 138.*
* Not acceptable for IFT9701 or IFT9703. If no tag or no 13-digit number on tag, contact factory.
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