Yokogawa EJX530B - Manual (Page 52)

<8. Setting Parameters>
8-19
IM 01C27F01-01EN
The low cut point has hysterisis so that the output
around the point is behaved as below figure.
<Example>
Output mode: Linear
Low cut mode: Zero
Low cut: 20.00%
Output
Setting range:
0 to 20%
Input
0%
(20%)
2%
Low
cut
point
Hystrersis fixed at 10%
of the cut point
F0805.ai
8.3.8 Integral Indicator Scale Setup
The following two displays are available for the
integral indictor: pressure and temperature. The
following two variables can be displayed on the
integral indicator: % of pressure range, and % of
temperature range.
Available displays
Description
and related parameters
% of range
(PRES %)
Indicates input pressure in –10 to
110% range depending on the set
range ( LRV and URV).
PRES % 45.6 %
Follow the procedure described in (1) to (2) below
to set the integral indicator.
(1) Display Selection
Display set to Display Selection is displayed on the
integral indicator.
• Procedure to call up the Display Selection
display
TRANSDUCER block: Display Selection
The Display Selection parameter enables the
pressure (AI1 block), and, temperature (AI3
block) to be displayed on the LCD. Select
whether or not to enable each block to be
displayed.
(2) Cyclic Display
Information in the AI1, AI3 blocks can be displayed
cyclically according to the display On/Off setting
for the pressure (AI1 block), and temperature (AI3
block) selected in the Display Selection parameter.
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 ºC (deg C) is selected in the Units
Index parameter for the temperature(AI3 block).
Note: When the unit is changed by Sensor Range.Units Index
parameter in temperature (AI3 block), units of capsule
temperature is also changed.
8.3.10 Zero Point Adjustment and Span
Adjustment
Each EJX-B series 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.