Yokogawa EJX210B - Manual (Page 55)

<8. Setting Parameters>
8-20
IM 01C27C01-01EN
8.3.9 Unit for Displayed Temperature
When the instrument is shipped, the temperature
units are set to C (Centigrade). Follow the
procedure below to change this setting.
• Procedure to call up the Sensor Range.Units
Index display
AI3 block : Sensor Range.Units Index
Confirm that °C(deg C) is selected in the
Sensor Range.Units Index parameter for the
temperature
(AI3 block).
Note: When the unit is changed by Sensor Range.Units Index
parameter in temperature ( Al3 block) , units of capsule
temperature is also changed.
8.3.10 Unit for Displayed Static Pressure
Follow the procedure to change the static pressure
unit.
Changing this parameter also changes the unit for
the static pressure display.
• Procedure to call up the PV Range.Units Index
display
AI2 block : PV Range.Units Index
Confirm that KPa is selected in the PV Range.
Units Index parameter for the static pressure
(AI2 block).
Monitoring the high or low static pressure of the
capsule depends on the setting of parameter
‘SP Select.’
• Procedure to call up the SP Select display
AI2 block: SP Select
Select High or Low in the SP Select parameter
for the static pressure (AI2 block).
Type of static pressure is set Absolute pressure
(Abs) at shipment.
When changing monitoring type of static pressure,
Follow below procedure.
• Procedure to call up the Static Press Type
display
AI2 block: Static Press Type
Select gauge pressure (Gauge) or absolute
pressure (Abs) in the Static Press Type
parameter for the static pressure (AI2 block).
8.3.11 Zero Point Adjustment and Span
Adjustment
Each EJX-B Series Differential Pressure/Pressure
Transmitter is characterized by factory. But there
are some errors caused by environment and
installed posture.
There are Zero and Span Adjustments to fine-tune
those errors.
Zero Adjustment is adjustment for one point to
adjust the bottom value of the measurement range
as 0 % of output.
The Span Adjustment defines input and output
characteristic between two points that’s one side
assumed as standard.
This is used when there is doubt of span drift or
when it is impossible to make zero at absolute
pressure with adjustment for user’s pressure
standard.
(1) Zero Point Adjustment
a. To set 0% at current input, perform
following procedure.
This method is used only when the pressure at
bottom of measurement range is zero.
• Procedure to call up the low limit adjustment
parameter (Calibration Lowest Point).
AI1 block : Calibration Lowest Point
Set 0 to the Calibration Lowest Point
parameter of differential pressure (AI1 block).
• Procedure to call up the calibration
adjustment parameter (Cal Cmd).
AI1 block : Cal Cmd : CAL_LOW
Lower limit is changed by using Cal Cmd
parameter for differential pressure (Al1
block).
• Procedure to call up the calibration status
parameter (Cal Status).
AI1 block : Cal Status
Confirm the value of CAL_SUCCESS (1)
using the Cal Status parameter.