Yokogawa EJA440E - Manual (Page 28)

<3. Parameter Setting>
3-15
IM 01C25T01-06EN
3.2.8 Static Pressure Setup
The differential pressure transmitter can display the
static pressure also.
(1) Setting of the unit for static pressure
Follow the procedure below to change the static
pressure unit.
• Procedure to call up the display
DD and DTM
(excluding EJX_
HART 5[1.2])
[Root Menu] → Basic setup →
SP setup →
EJX_HART 5[1.2]
DTM
Configuration → Process Input (or
Static Pressure Sensor) →
→ SP Unit Select the unit for static pressure
(Refer to subsection 3.2.2 Unit)
(2) Setting of the measuring range for static
pressure
Follow the procedure below to change the lower
range value (LRV) and upper range value (URV).
• Procedure to call up the display
DD and DTM
(excluding EJX_
HART 5[1.2])
[Root Menu] → Basic setup →
SP setup → SP Range → Keypad
input →
EJX_HART 5[1.2]
DTM
Configuration → Static Pressure
Sensor →
→ SP LRV Set the lower range value (0 %) of
static pressure
→ SP URV Set the upper range value (100 %)
of static pressure
(3) Selection of Gauge pressure and Absolute
pressure
Either the gauge pressure or absolute pressure can
be selected to display on the LCD display.
Absolute pressure is selected when the transmitter
is shipped.
• Procedure to call up the display
DD and DTM
(excluding EJX_
HART 5[1.2])
[Root Menu] → Basic setup →
SP setup → SP A/G Setup →
EJX_HART 5[1.2]
DTM
Configuration → Static Pressure
Sensor →
→ A/G Select Select “Gauge” or “Absolute”
→ Atm. Pres Value 0.1013 MPa when the transmitter
is shipped
(4) Selection of pressure side
Either the high or low pressure side of capsule can
be selected to monitor the static pressure.
High pressure side is selected when the transmitter
is shipped.
• Procedure to call up the display
DD and DTM
(excluding EJX_
HART 5[1.2])
[Root Menu] → Basic setup → SP
setup →
EJX_HART 5[1.2]
DTM
Configuration → Static Pressure
Sensor →
→ SP H/L Select Select “High” or “Low”
3.3 Detailed Setup
3.3.1 Bi-directional Flow Measurement
(a) Bi-dir mode enables selection of 50% output at
an input of 0 mmH
2
O.
• Procedure to call up the display
DD and DTM
(excluding EJX_
HART 5[1.2])
[Root Menu] → Detailed setup →
Signal condition →
EJX_HART 5[1.2]
DTM
Configuration → Analog output →
→ Bi-dir mode Select “On” or “Off”
(b) Combining Bi-dir mode with Xfer fnctn
provides a square root output computed
independently for 0% to 50% output and for
50% to 100% output.
20 mA (100% display)
4 mA (−100% display)
 Output mode “LINEAR”
LRV HRV
F0304.ai
20 mA (100% display)
Low Cut
4 mA (−100% display)
 Output mode “SQUARE ROOT”
LRV HRV