45
Reference Manual
00809-0100-4772, Rev FA
Transducer Block
March 2016
Transducer Block
If Standard/Normal engineering units are selected (Normal m
3
/sec, Standard ft
3
/sec, etc.),
and if the requirement is for the transmitter to calculate the Density Ratio according to the
ideal gas law, the following must be configured:
1. Base Temperature
2. Base Temperature Units
3. Base Pressure (Absolute)
4. Base Pressure Units
5. Base Compressibility
6. Process Pressure (Absolute)
7. Process Pressure Units
8. Process Compressibility
Or as an alternative, the Process Density Ratio can be configured directly.
Using the Resource Block RESTART parameter, initiate a PROCESSOR restart. When the
transmitter comes back on line, verify your configuration. This will ensure that all
parameters have been properly stored in nonvolatile memory.
This configuration process will be sufficient for most applications.
4.2 Parameters and descriptions
The transducer block parameters, index numbers, and definitions are listed in Table 4-1.
Table 4-1. Transducer Block Parameters
Parameter
Index
number
Definition
ALERT_KEY 4 The alert key is the identification number of the plant unit. This
information may be used in the host for sorting alarms, etc.
BASE_COMPRESSIBILITY 58 Base compressibility is the compressibility of the process fluid at the
base temperature and base pressure. It is used to calculate the
PROCESS_DENSITY_RATIO and is not limit checked.
BASE_PRESSURE 56 Base pressure is the defined absolute pressure at base conditions. It is
usually defined at 1 atmosphere. Base pressure is used to calculate the
Process Density Ratio.
BASE_PRESSURE_UNITS 57 The engineering units of base pressure:
1137 = bar (absolute)
1142 = pounds per square inch (absolute)
1545 = Megapascals (absolute)
1547 = Kilopascals (absolute)
1557 = Kilograms per square centimeter (absolute)
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