D U
Display Units Control
Set the
D
isplay
U
nits for compensated pressure replies. A
USER
defined display unit can be set with
this command that causes the pressure output to equal the value input by the
U=
command multi-
plied by the actual pressure in psi units. (Default:
DU=PSI
)
Inquiry: *dd
DU
Action: *dd
WE
*dd
DU=
EEPROM Store: *dd
WE
*dd
SP=ALL
{
ATM
|
BAR
|
CMWC
|
FTWC
|
INHG
|
INWC
|
KGCM
|
KPA
|
Display Unit
MBAR
|
MMHG
|
MPA
|
MWC
|
PSI
|
USER
|
LCOM
|
PFS
}
PSI Multiplier
(1)
Units Description
AT M ....................... 0.068046 ........................... ambient atmosphere at sea level
BAR ........................ 0.068948 ........................... bar (105 newtons/meter2)
CMWC ................... 70.304 ............................... centimeters of water column (4 °C)
FTWC .................... 2.3065 ............................... feet of water column (4 °C)
I N H G ..................... 2.0360 ............................... inches of mercury (0 °C)
INWC ..................... 27.679 ............................... inches of water column (4 °C)
KGCM .................... 0.070307 ........................... kilograms/centimeter2
KPA ........................ 6.8948 ............................... kilopascal
MBAR .................... 68.948 ............................... millibar (1 hectopascal)
M M H G ................... 51.714 ............................... millimeters of mercury (0 °C) or torr
MPA ....................... 0.0068948 ......................... megapascal
MWC ...................... 0.70304 ............................. meters of water column (4 °C)
PSI ......................... 1.0000 ............................... pounds per square inch
USER ..................... 0.0010000-999.99 ............. user supplied (see also
U=
command)
LCOM .................... FS=60000 .......................... logic common value (2)
PFS ........................ FS=100.000 ....................... percent of full scale in 0.001% increments
Table 5.5—Display Units Options
(1)
From the
CRC Handbook Of Tables For Applied Engineering Science
(2)
The
LCOM
display unit (logic common) automatically switches the digital pressure output to a scale which
has 60000 as the full scale output (±60000 for differential devices). The output will have a decimal point in the
same position that it is in with the original psi scale. For example, when a 10psia device is switched to
DU=LCOM
, the full scale digital pressure output will be 60.000, instead of 10.000. Also, a 500psi device will
output full scale at 600.00 instead of 500.00. If the pressure reading was at zero, then no output change will be
seen since zero is the same for any display unit.
LCOM
provides the highest reading resolution available when
using the standard output format (
OP=S
).
4 7
