Yokogawa Wireless Temperature Transmitter YTA510 - Manual (Page 31)

3. OPERATION
IM 01C50T01-01E 3-18
NOTE
1. This function is effective only in three kinds of
sensors; Pt100, Pt200 and Pt500.
2. Input relations between the sensor type and
the value of R 0 properly. When Pt100 is
specified as an input type, the value close to
100 must be set to R
0 . When Pt500 is
specified as an input type, the value close to
500 must be set to R
0.
3. When the sensor type is changed, the sensor
matching function must be set up again or set
to “Disable”.
● Setting the Sensor Matching Function (by
using alpha delta and beta co-effieicent)
1. Set the designated sensor type and the number of
wires. (Refer to “3.4.1 Sensor Configuration” in
this manual. )
2. Call up the “Snsr1 Match Enbl” display.
[1.Device setup
→
3. Basic setup
→
4. Snsr1 config
→
4. Snsr1 Match Enbl ]
3. Select “Enable” and press ENTER[F4] .
4. Call up the “Snsr1 Match coefs” display.
[1. Device setup
→
3. Basic setup
→
4. Snsr1 config
→
5. Snsr1 Match coefs ]
5. Select “2. alpha delta beta” and press ENTER[F4] .
6. The display shows the current setting of the R 0 ,
alpha, delta, and beta values. Press OK[F4] .
7. The communicator prompts you to enter R 0 , alpha,
delta and beta value successively. Enter the R 0 ,
alpha, delta and beta values and press ENTER[F4]
accordingly.
8. Press OK[F4] to confirm the new values.
9. Press SEND[F2] to transfer the data to the trans-
mitter. Check that [SEND] dissappears.
When “Disable” is selected in the above step 3,
temperature is calculated by using the default value of
R
0 , alpha, delta and beta.
● Setting up the Sensor Matching Function
(by using A,B and C co-effieicent)
If using the R 0 , A,B and C parameters in place of
alpha delta and bata co-efficients, replace “2. alpha
delta beta” with “1. A B C” in the step 5 in the above.
● For Setting up two sensors (For model
YTA320 )
If using two sensors with a model YTA320, repeat the
procedures for the Sensor2. [1. Device setup
→
3. Basic setup
→
5. Snsr 2 config ]
Table 3-3
Item
Initial Setting Value
A
B
C
α
δ
β
100
3.9083 E-3
-5.775 E-7
-4.183 E-12
3.8506 E-3
1.4998
1.0863 E-1
T0303.EPS
R 0
IEC
Callender
vanDusen
Note : “E-3” stands for 10 -3
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.
If the constant value is set to “0”, compensation will
not be applied.
1. Call up the parameter “CJC Select” . [1.Device
setup
→
4. Detailed setup
→
1. Sensors
→
3. Term
temp sensor
→
4. CJC Select ]
2. Select “Constant CJC” and press ENTER[F4] .
3. Call up the parameter “CNST CJC Temp” .
[1.Device setup
→
4. Detailed setup
→
1. Sensors
→
3. Term temp sensor
→
5. CNST CJC Temp
4. Enter temperature value in constant and press
ENTER[F4] .
3.6 Self-Diagnostics
3.6.1 Checking for Problems
(1) Identifying Problems with the HART Com-
municator
Self diagnostics of the transmitter and check of
incorrect data settings can be carried out with the
HART communicator. There are two methods for self-
diagnosis of the transmitter; self-diagnosis for every
transmission and manually executing the Self test
command.
In YTA series, there're two classes to show the result
of diagnostices; errors and warnings. Errors are the
serious status for operation which must be corrected