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4 SMV 3000 Transmitter User’s Manual 1/99
1.3 SMV 3000 Smart Multivariable Transmitters, Continued
SMV Operating Modes
The SMV 3000 can transmit its output in either an analog 4 to 20
milliampere format or a Digitally Enhanced (DE) protocol format for
direct digital communications with our TPS/TDC 3000 control system. In
the analog format, only a selected variable is available as an output which
can be any one of the following:
• Differential Pressure PV1,
• Static Pressure PV2,
• Process Temperature PV3, or
• Calculated Flow Rate PV4
Note that the secondary variable is only available as a read only parameter
through the SCT or SFC. See Figure 2.
Figure 2 Functional Block Diagram for Transmitter in Analog Mode of Operation.
A/D
∆P Sensor
PV1
Temperature
Sensor
SV1
Static Pressure
Sensor
PV2
M
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t
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p
l
e
x
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Microprocessor
Meter Body
Electronics Housing
Pressure
Proportional 4 to 20mA
output for selected PV
(Digital signal imposed
during SFC
communications).
Factory
Characterization
Data
D/A
PROM
A/D
RTD or
Thermocouple
Input
PV3
PV4
PV1 = Differential Pressure
PV2 = Static Pressure
PV3 = Process Temperature
PV4 = Calculated Volumetric
or Mass Flow
SV1 = Meter Body Temperature
(Read only)
O
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t
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g
C
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a
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t
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Digital I/O
Continued on next page