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6/08 ST 3000 Release 300 and SFC Model STS103 User’s Manual 3
1.2 ST 3000 Smart Transmitters, Continued
About the transmitter,
continued
Besides the process variable (PV) output, the transmitter also provides
its meter body temperature as a secondary variable which is only
available as a read-only parameter through the SFC when the transmitter
is in its analog mode. See Figure 2.
Figure 2 Functional Block Diagram for Transmitter in Analog Mode of Operation.
A/D
DP or PP
Sensor
Temperature
Sensor
Static Pressure
Sensor
Meter Body
Electronics Housing
Pressure
Factory
Characterization
Data
Modular Electronics
Terminal Block
Proportional 4 to
20 mA PV output.
(Digital signal
imposed during
SFC
communications)
D/A
PROM
M
u
lt
ip
le
x
e
r
Microprocessor
Digital I/O
When the transmitter is in its DE mode, the process variable is available
for monitoring and control purposes; and the meter body temperature is
also available as a secondary variable for monitoring purposes only.
See Figure 3.
Continued on next page