Communications Options User’s Guide
75
Chapter 8. HART Communications
8.3 Flowmeter Software Setup (cont.)
To configure your HART option card analog output using any of the first three methods, follow the instructions in the
appropriate
User’s Manual. During configuration, the choice of parameter must be limited to those listed in Table 11.
To use the HART device for configuration of the analog output, refer to the instructions that came with that device.
Some flowmeter parameters can only be read by the HART device during startup. Therefore, it is recommended that
both the flowmeter and the HART device be rebooted after any reprogramming of the HART option card analog
output. Failure to do so may result in erroneous information or a communication failure between the flowmeter and
the HART device.
8.4 Using the HART Interface
The HART communications option card installed in Panametrics flowmeters has been successfully tested with the
Rosemount 275 Hand-Held Communicator
and the
Rosemount AMS Computer-Based Communications Software
.
Although some flowmeter functions may be performed using the HART device, many other functions (i.e. data
logging, site file uploading, site file downloading, printing, etc.) must still be programmed by the methods described
in the flowmeter
User’s Manual. This is because the HART protocol was developed for use with simple transmitters
and it cannot handle the multitude of sophisticated functions built into the Panametrics flowmeters.
8.4.1 Unit Types
Due to limitations of the HART protocol, only those unit types listed in Table 11 are acceptable. If a meter parameter is
set to any other measurement units, the HART device displays an
“Unknown Enumerator, Can not resolve” error
message and may terminate communications entirely. In some cases, both the Hart device and the flowmeter may
have to be rebooted to clear the error. To address this potential problem, the flowmeter has been programmed to
force all measurement units to HART compliant units if a HART option card is detected upon startup.
8.4.2 HART Functions
After HART communications has been properly set up, the following flowmeter functions may be accessed using the
HART device:
•
Static temperature and static pressure
Note:
To view the static temperature or pressure for a channel using the HART device, the fixed value for that
parameter must be assigned to that channel at the flowmeter. See your User’s Manual for instructions.
Table 11: Valid HART Parameters and Units
Parameter
English Units
Metric Units
Velocity
ft/sec
m/s
Volumetric
(liquid)
gal/s, gal/m, gal/h, mgal/day, cuf/s, cuf/m, cuf/h,
mcf/day, bbls/s, bbl/m, bbl/h, mbl/d,
acre-inch/day
l/s, l/m, l/h, ml/d, cum/s, cum/m, cum/h,
mcm/d, bbl/s, bbl/m, bbl/h, mbl/d
Volumetric (gas)
acf/m, acf/h, scf/m, scf/h
acm/h, scm/h, scm/d
+Tot, -Tot (liquid) gal, cuf,bbl, acre-in, acre-ft
liter, cum, bbl
+Tot, -Tot (gas)
acf, scf
acm, scm
Mass Flow
lb/s, lb/m, lb/h, mlb/d, ton/m, ton/h, mton/d
kg/s, kg/h, mkg/d, tne/m, tne/h, tne/d
+Mass, -Mass
lb, ton
kg, tne
Power
kbtu/h, kw
mcal/h, kw
+Energy, -Energy
btu, kw-hr
mcal, kw-hr
Temperature
°F
°C
Pressure
psia
bar, bara
Mol Weight
none
none
NOTE:
“acf” is reported as “normal cubic feet” in HART. Also, “Mega” units (i.e. mgal/day, mcf/day, etc.) are reported
as standard units x 10^6 in HART. For example, 1 mgal is 1x10^6 gal in HART.
