Honeywell SMV 3000 - Manual (Page 16)

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
u
lt
ip
le
x
e
r
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
pe
ra
tin
g
Ch
ar
ac
te
ris
tic
s
Digital I/O
Continued on next page