Honeywell ST 3000 User Manual page 17

1.2 ST 3000 Smart Transmitters,
About the transmitter,
continued
Figure 2 Functional Block Diagram for Transmitter in Analog Mode of Operation.
Meter Body
DP or PP
Sensor
Temperature
Sensor
Static Pressure
Sensor
Pressure
6/05 ST 3000 Release 300 and SFC Model STS103 User's Manual
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.
Factory
Characterization
Data
PROM
Microprocessor
A/D
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
Electronics Housing
D/A
Digital I/O
Modular Electronics
Proportional 4 to
20 mA PV output.
(Digital signal
imposed during
SFC
communications)
Terminal Block
Continued on next page
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