Emerson 3051S Especificaciones Pagina 87

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61
Reference Manual
00809-0100-4803, Rev DA
Section 3: Configuration
April 2013
Configuration
Table 3-12. Temperature modes
Note
Process Temperature Mode Setup only applies to transmitters with Fully Compensated Mass and
Energy Flow Feature Board.
3. The Sensor Limits and Minimum Span can be viewed under the Process Temperature
Sensor Limits heading. The upper and lower sensor limits may be edited as needed.
The 3051S MultiVariable accepts Callendar-Van Dusen constants from a calibrated RTD
schedule and generates a special custom curve to match that specific sensor Resistance vs.
Temperature performance. Matching the specific sensor curve with the transmitter
configuration enhances the temperature measurement accuracy.
4. Under the Sensor Matching heading, the Callendar-Van Dusen constants R
0
, A, B, and C
can be viewed. If the Callendar-Van Dusen constants are known for the user’s specific Pt
100 RTD sensor, the constants R
0
, A, B, and C may be edited by clicking on the
Callendar-Van Dusen Setup button and following the on-screen prompts.
The user may also view the , ß, and Coefficients by clicking on the View Alpha, Beta,
Delta button. The constants R
0
, , ß, and may be edited by clicking on the
Callendar-Van Dusen Setup button and following the on-screen prompts. To reset the
transmitter to the IEC 751 Defaults, click the Reset to IEC 751 Defaults button.
3.7.7 Module temperature
The sensor module temperature variable is the measured temperature of the sensors and
electronics within the SuperModule assembly. The module temperature can be used to control
heat tracing or diagnose device overheating.
Temperature Mode Description
Normal The transmitter will only use the actual measured Process Temperature
value. If the temperature sensor fails, the transmitter will put the analog
signal into Alarm.
Backup The transmitter will use the actual measured Process Temperature value. If
the temperature sensor fails, the transmitter will use the value shown in the
Fixed / Backup Temperature field.
Fixed The transmitter will always use the temperature value shown in the Fixed /
Backup Temperature field.
Mass and Energy Flow Fast Keys 1, 4, 1, 7
Direct Process Var. Output Fast Keys 1, 4, 1, 4
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