Yokogawa EJX530B - Manual (Page 54)

<8. Setting Parameters>
8-21
IM 01C27F01-01EN
(2) Span Adjustment
Span Adjustment is function to change the input and
output characteristic that assumed the bottom value
(zero point) of measurement range a standard.
Therefore, perform span adjustment (adjustment
of the upper limit value) after zero adjustment
(adjustment of bottom limit value).
After adding the pressure at point of adjustment and
setting pressure value as parameter, the transmitter
calculates quantity of adjustment and performs
adjustment automatically.
• Procedure to call up the lower limit value
parameter (Calibration Lowest Point)
AI1 block: Calibration Lowest Point
Set the lower limit adjustment value on the
pressure (AI1 block) Calibration Lowest
Point parameter screen. Apply a reference
pressure corresponding to the lower limit of the
measurement range to the pressure transmitter
and confirm the pressure when it stabilized.
• Procedure to call up the calibration adjustment
parameter (Cal Cmd)
AI1 block: Cal Cmd: CAL_LOW
Confirm the lower limit of the measurement
range in CAL_LOW of the pressure (AI1 block)
Cal Cmd parameter.
• Procedure to call up the calibration status
parameter (Cal Status)
AI1 block: Cal Status
Confirm the calibration status of CAL_
SUCCESS (1) using the Cal Status parameter.
• Procedure to call up the upper limit adjustment
parameter (Calibration Highest Point).
AI1 block: Calibration Highest Point
Set the upper limit adjustment value for the
pressure (AI1 block) Calibration Highest
Point parameter. Apply a reference pressure
corresponding to the upper limit of the
measurement range to the pressure transmitter
and confirm the when it has stabilized.
• Procedure to call up the calibration adjustment
parameter (Cal Cmd).
AI1 block: Cal Cmd: CAL_HIGH
Confirm the upper limit of the measurement
range in CAL_HIGH of the pressure (AI1 block)
Cal Cmd parameter.
• Procedure to call up the calibration status
parameter (Cal Status)
AI1 block: Cal Status
Confirm the calibration status of Cal Status (1)
using the Cal Status parameter.
(3) Reset Adjustments
Reset Adjustment clear the amount of adjustment.
Reset Adjustment can be performed using
CAL_CLEAR of the pressure (AI1 block) Cal Cmd
parameter for the input pressure. After calibration,
confirm status by using the pressure (AI1 block) Cal
Status.
The amount of adjustment made by the external
zero-adjustment screw can be reset to the initial
setting as well.
• Procedure to call up the calibration adjustment
parameter (Cal Cmd).
AI1 block: Cal Cmd: CAL_CLEAR
8.3.11 Software Write Protect
Hardware write protection and software write
protection functions are available for this transmitter
• Procedure to call up the protection setting
parameter (UAP Option)
UAPMO block: UAP Option
The following settings can be configured in the
UAP Option parameter.
- Setting to enable or disable software write
protection.
- Setting to enable or disable the hardware
write protection switch.
- Setting to enable or disable changing
the setting to the Diagnostic Switch and
Diagnostic Configuration parameters.
• Procedure to call up the protection setting
display parameter (Hardware Write Protect)
UAPMO block: Hardware Write Protect
The Hardware Write Protect parameter enables
the switch status of hardware write protection to
be displayed.
For the relationship between hardware write
protection and software write protection, refer
section 10. “Parameter Summary”.