Yokogawa EJX930A - Manual (Page 26)

<3. Parameter Setting>
3-15
IM 01C25R02-01E
NOTE
The calibration range can be set as PV LRV >
PV URV under the following conditions,
reversing the 4 to 20 mA output signal.
PV LSL -10% of USL ≤ PV LRV ≤ PV USL
+10% of USL
PV LSL -10% of USL ≤ PV URV ≤ PV USL
+10% of USL
|PV URV - PV LRV| ≥ PV Min. Span
If PV is flow, PV LRV and PV URV must be the
following conditions.
0 ≤ PV LRV
0 ≤ PV URV
PV LRV < PV URV
The flow range is set to LRV=0 and URV=100
when the Flow calc mode is changed to Basic
mode or Full Auto mode.
If PV is ET, PV LRV and PV URV must be the
following conditions.
-210°C ≤ PV LRV ≤ 860°C
(-346°F ≤ PV LRV ≤ 1580°F)
-210°C ≤ PV URV ≤ 860°C
(-346°F ≤ PV URV ≤ 1580°F)
|PV URV - PV LRV| ≥ PV Min. Span
3.2.4 Units
Refer to the subsection 3.2.3 to call up the display.
Select the unit from displayed list as shown below.
(1) Unit list of differential pressure
mmH2O, mmH2O@68degF, mmHg, Torr, MPa,
kPa , Pa, mbar , bar , gf/cm2, kgf/cm2, inH2O,
inH2O@68degF, inHg, ftH2O, ftH2O@68degF, psi,
atm, hPa
Note that the Yokogawa default setting for the
standard temperature is 4°C (39.2°F). For the units
of mmH
2
O, inH
2
O, and ftH
2
O, the pressure varies
according to the standard temperature definition.
Select the appropriate unit with @68degF when a
standard temperature of 20°C (68°F) is required.
(2) Unit list of static pressure
mmH2O, mmH2O@68degF, mmHg, Torr, MPa,
kPa , Pa, mbar , bar , gf/cm2, kgf/cm2, inH2O,
inH2O@68degF, inHg, ftH2O, ftH2O@68degF, psi,
atm, hPa
(3) Unit list of temperature
degC , degF, Kelvin *
*: In the case of using DTM(HART 7), it is displayed as “K“.
(4) Unit list of flow
Mass Flow g/s, g/min, g/h, kg/s, kg/min, kg/h,
kg/d, t/min, t/h, t/d, lb/s, lb/min, lb/h,
lb/d, STon/min, STon/h, STon/d,
LTon/h, LTon/d
Normal/
Standard
Volume
Flow
Nm3/h, NL/h, SL/h, SL/min, SL/s,
Nm3/d, SCFD, SCFH, SCFM, SCFS,
Sm3/d, Sm3/h, MSCFD, MMSCFD
Volume
Flow
CFM, GPM, L/min, Impgal/min, m3/h,
gal/s, Mgal/d, L/s, ML/d, CFS, ft3/d,
m3/s, m3/d, Impgal/h, Impgal/d, CFH,
m3/min, bbl/s, bbl/min, bbl/h, bbl/d,
gal/h, Impgal/s, L/h, gal/d
(5) Unit list of total flow
g, kg, t, lb, Ston, Lton, oz, gal, L, Impgal, m3,
bbl, yd3, ft3, in3, Nm3, NL, SCF, Spcl*
* The user unit is displayed on LCD.
To configure the user unit, refer to subsection 3.3.5.
3.2.5 Damping Time Constant Setup
Any number from 0.00 to 100.00 can be set for
the amplifier damping time constant of process
variables.
Refer to subsection 3.2.3 to call up the display.
Damping time constant is set as shown in the
following table at the factory when the instrument
is shipped, but in case of the option code /CA is
specified, the damping time constant is set as
specified in the order.
Process variables Factory default value
Differential pressure 2sec
Static pressure 1sec
External temperature 2sec
Flow rate 0sec
NOTE
• When the HART communication is used
under the condition of quick output change,
set the damping time constant more than 0.5
sec.
• The damping time constant for the amplifier
assembly can be set here. The damping time
constant for the entire transmitter is the sum
of the values for the amplifier assembly and
the capsule assembly.
About the value for the capsule assembly,
refer to the User’s Manual for EJX910/
EJX930 (IM 01C25R01-01E) or General
Specifications (GS 01C25R01-01E, GS
01C25R04-01E).