<3. Parameter Setting >
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IM 01C50T01-02EN
3.5.12 CJC Selection
For thermocouple input, the terminal temperature
measured by an internal sensor is used for
Cold Junction Compensation function. In YTA,
constant value set by users can be used for the
compensation function in place of the measured
terminal temperature.
a) Procedure to call up the parameter “CJC”
Device setup → Basic setup → Sensor Basic
Setup → CJC Setup → set CJC Type
Set the CJC type and set the CJC function by
following the message shown.
In case of using Terminal temperature, select
“Internal CJC Temperature Measurement”.
In case of using constant value set by users,
select “Fixed CJC Temperature”.
3.5.13 TC User Table
This function enables users to calculate
temperature by creating their own table for TC
sensors for the conversion between temperature
and electromotive force.
Specifications
Number of tables: 1 (common for Sensor1 and
Sensor2)
Sensor type: TC User Table (TC only)
Input items: Temperature and electromotive force
Number of valid points: 5 to 50 points
Input the values of temperature and
electromotive force in ascending order from the
top of the table. This function determines the
end of the table as being where the value of
either temperature or electromotive force is not
in ascending order.
Measuring range: −10 to 120 mV
How to input: Only from DTM, using FieldMate as
a setting tool
• Procedure to set up the function
From menu bar of the DTM works window, click
“Device” → “Additional Functions” → “TC User
Table”
Set the valid points and unit and fill in the
Temperature and Electromotive force table.
NOTE
Before setting the TC User Table, perform the
Sensor Type to “TC User Table”.
(see 3.4.1)
F0308.ai
Temperature
Electromotive force
Note: Interpolating between valid points
in the quadratic equation.
No. Temp. Electro.
force
V
1
.
.
.
V
n
t
1
.
.
.
t
n
1
.
.
.
n
t
n
t
1
V
1
V
n
Figure 3.6
TC user’s table
NOTE
When the TC user table is set incorrectly, reverse
calculation alarm may be generated.
3.5.14 Simulation
Using the simulation function, the output signal can
be confirmed by setting any value and status to the
selected device variable. Call up the parameter and
follow the message shown.
After completing “(2) Test status” setting, the
simulation starts. Integral indicator shows output
value.
(1) Test device variable
• Procedure to call up the display
Device setup → Diag/Service → Test Device →
Device Variable Test
→ enable Dev Var Sim or disable Dev Var Sim
Set the parameters according to the method.
(2) Test status
• Procedure to call up the display
Device setup → Diag/Service → Test Device →
Device Status Test
→ en/ds Dev Sts Sim
Set the parameters according to the method
IMPORTANT
• Test output is held for approximately 10
minutes (depends on Auto Release Time
setting), and then released automatically
after the time has elapsed. If the HART
communicator power supply is turned off or
communication connector is disconnected
during the test output operation, it is held for
approximately 10 minutes.
• Select “Disable” to release the test output
immediately.
• If the temperature transmitter power supply
is turned off, test output is released.
