Emerson MICRO MOTION HFVM Series Configuration And Use Manual page 11

Table 1-2:
Measurement type
I/O and communications
Channel A = 4–20 mA + HART
Channel B = 4–20 mA
Channel C = Modbus/RS-485
(1) Calculated from reference density and reference temperature using the API equations for crude oil.
(2) Three methods: ASTM D341 single-curve, ASTM D341 multi-curve, and matrix referral.
Comparison of process variables by HFVM model
The following table provides an overview of the similarities and differences in process
variables.
Table 1-3:
Measurement type
Direct measurement
Dynamic viscosity
Kinematic viscosity
Density
Internal (RTD) temperature
External temperature
Derived value
Calculated Carbon Aromaticity Index (CCAI)
Calculated Ignition Index (CII)
Density
Referred viscosity (dynamic or kinematic)
Secondary referred viscosity (dynamic or kine-
matic)
Referred density (API)
User-defined calculation output
Quality factor
(1) Calculated from reference density and reference temperature using the API equations for crude oil.
(2) Three methods: ASTM D341 single-curve, ASTM D341 multi-curve, and matrix referral.
Configuration and Use Manual
Comparison of process measurement and features by HFVM model
(continued)
Comparison of process variables by HFVM model
(1)
(2)
HFVM-B
Yes
Yes
Yes
HFVM-B
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
(2)
Yes
Yes
Yes
Yes
Yes
Before you begin
HFVM-R
Yes
Yes
Yes
HFVM-R
Yes
Yes
No
Yes
No
No
No
Yes
No
No
No
Yes
Yes
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