Yokogawa Wireless Temperature Transmitter YTA510 - Manual (Page 47)

<7. Setting Parameters>
7-15
IM 01C50E01-01EN
- 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.
2) 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 to
section 9. "Parameter Summary".
7.3.13 Input Calibration
The input calibration function is used to adjust
to the transmitters internal interpretation of the
input signal. Perform the calibration procedure for
Sensor1 and Sensor2 separately.
Two points, namely, the lower adjustment point
called Zero point and the upper adjustment point
called Gain, are adjusted, respectively. There are
two adjustment methods. One method uses a
reference signal generator (e.g. a voltage generator
or variable resistor) and the other uses the signal
from a temperature sensor immersed in the solution
with a known temperature.
Input adjustment is performed by inputting (writing)
the signals (voltage, and resistance values)
currently being input as the parameters. This
instrument automatically corrects the error between
the written data and the internally calculated value.
Follow the procedure below for Sensor1 (AI1) for
example.
1) Setting the Input Adjustment Value
a) Setting the AI1 block write mode
• AI1 block : Mode : Target
Set the Target parameter to O/S.
b) Setting the update period
• CO block: Data publication period
Set the data publication period parameter
to 1 second. The computation period in the
transmitter will also be synchronized to the
update period and set to 1 second.
c) Setting the sensor type
• AI1 block: Lin Type
Set the sensor type used in the Lin Type
parameter.
d) Setting the cold conjunction compensation
• AI1 block: Selection of Reference Junction
Set the Selection of Reference Junction
parameter to No Reference (0) in order
to remove the effect of the cold junction
compensation when using the thermocouple for
the sensor type.
e) Perform Zero Point Adjustment using a
reference input generator. The input value
is adjusted near the zero point within the
measurement range used.
f) Set the Zero Point Adjustment value when the
input is stabilized.
• AI1 block: Cal Point Lo
Set the Cal Point Lo parameter to the voltage
value (unit: mV) when the temperature sensor
is the thermocouple, and set the resistance
value (unit: Ω) when the temperature sensor is
the resistance temperature sensor.
g) Perform gain-point adjustment using a
reference input generator. The input value
is adjusted near the gain point within the
measurement range used.
h) Set the gain-point adjustment value when the
input is stabilized.
• AI1 block: Cal Point Hi
Set the Cal Point Hi parameter to the voltage
value (unit: mV) when the temperature sensor
is the thermocouple, and set the resistance
value (unit: Ω) when the temperature sensor is
the resistance temperature sensor.
i) Setting the AI1 block write mode
• AI1 block : Mode : Target
Set the Target parameter to Auto and ensure
that the setting error of the adjustment value
has not occurred.