<3. Parameter Setting >
3-17
IM 01C50T01-02EN
3.5.6 Sensor Trim
Each YTA transmitter is factory-characterized
based on the standard sensor curve, and uses
this information to produce a process variable
output. The sensor trim function is used to make
an adjustment to the internal interpretation of the
input signal and the factory characterization in
the transmitter. (See Figure 3.4) Since the factory
characterization is kept even after applying the
trim operation, it is possible to recover factory
characterization.
Input
Lower trim
Upper trim
Input
One point trim
Two point trim
Output
Output
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Lower trim
Figure 3.4
Trim function images
● Procedures (For Sensor1)
Before performing the sensor trim, complete the
configuration of the sensor input.
a) Connect the calibration device to the transmitter
and warm-up for 3 minutes.
a. Wiring of power supply and output
b. Example of wiring of thermocouple
or DC voltage input (1-input type)
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+ Output signal
–
Load resistance
DC voltage generator or
thermocouple
Voltmeter
1
2
3
4
5
c. Example of wiring of thermometer resistor
4-wire type (1-input type)
Variable resistor or
thermometer resistor
1
2
3
4
5
(+)
(A)
(B)
(B)
(A)
(–)
Figure 3.5
Example of wiring for calibration
equipment
b) Apply lower input to Sensor1.
c) Procedure to call up the display
Device setup → Diag/Service → Calibration
→ Sensor trim → Sensor1 Trim → set
Sensor1 Trim
d) Select the sensor (Sensor1) to be trimmed.
e) Select the Lower trim only or the Lower & Upper
Trim.
f) Sensor1 temperature is displayed. If the value
is OK, press OK. If the display value is different
from the expected value, enter the expected
value.
Example: In case of the temperature of the
Sensor1 indicates the 1°C and expected
temperature is 0°C, enter 0°C.
g) Next carry out the Upper trim. Apply Upper input
to Sensor1.
h) Carry out the Upper Trim same as the Lower
Trim procedures.
NOTE
“reset Sensor1 Trim” or “reset Sensor2 Trim” can
reset each sensor trim adjustment value to the
initial calibrated value.
3.5.7 Analog Output Trim
Fine current output adjustment is carried out with
AO trim.
AO trim is to be carried out if the calibration digital
ammeter does not exactly read 4.000 mA and
20.000 mA with an output signal of 0% and 100%.
• Procedure to call up the AO trim display
Device setup → Diag/Service → Calibration →
AO Trim → set AO Trim
Follow the message to adjust analog output.
IMPORTANT
If you abort the method by pressing the close
button at the top right corner of the dialog during
the method is still running, you may not be able
to return to normal. If you abort the method by
this procedure, please re-run the method and
return to normal.
