Yokogawa EJX930A - Manual (Page 33)

<3. Parameter Setting>
3-22
IM 01C25R02-01E
• Procedure to call up the display for differential
pressure
DD (HART 5/7)
DTM (HART 7)
[Root Menu] → Diag/Service →
Calibration → Pres Sensor trim →
Clear P trim → Execute
DTM (HART 5) Calibration → Clear Pressure Sensor
trim → Execute
• Procedure to call up the display for static
pressure
DD (HART 5/7)
DTM (HART 7)
[Root Menu] → Diag/Service →
Calibration → SP Sensor trim →
Clear SP trim → Execute
DTM (HART 5) Calibration → Clear Static Pressure
Sensor trim → Execute
• Procedure to call up the display for external
temperature
DD (HART 5/7)
DTM (HART 7)
[Root Menu] → Diag/Service →
Calibration → ET Sensor trim →
Clear ET trim → Execute
DTM (HART 5) Calibration → Clear External Temp
Sensor trim → Execute
3.3.7 Trim Analog Output
Fine current output adjustment is carried out with
D/A trim or Scaled D/A trim.
(1) D/A Trim
D/A 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 D/A trim display
DD (HART 5/7)
DTM (HART 7)
[Root Menu] → Diag/Service →
Calibration
→ Analog output trim → D/A trim
DTM (HART 5) Calibration → D/A trim
(2) Scaled D/A Trim
Scaled D/A trim is to be carried out if the output is
adjusted using a voltmeter or a meter whose scale
is 0 to 100%.
• Procedure to call up the Scaled D/A trim
display
DD (HART 5/7)
DTM (HART 7)
[Root Menu] → Diag/Service →
Calibration
→ Analog output trim →Scaled D/A
trim
DTM (HART 5) Calibration → Scaled D/A trim
Adjustment using a volt meter. (4mA → 1V, 20mA
→ 5V)
1) Select “Change”.
2) Enter the value read on the voltmeter when the out-
put signal is 4mA.
In this case, enter the value of the voltage across a
250Ω resistor (1V).
3) Enter the value read on the meter when the output
signal is 20mA (5V).
4) Select “Proceed”.
5) Connect the voltmeter.
6) Output the 0% output signal and read the output
value.
7) Enter the reading of the voltmeter to the configuration
tool. (The output of the transmitter changes).
8) Confirm the voltmeter reading is 1.000.
9) If the reading on the voltmeter is 1.000, select “Yes”.
If the reading is not 1.000, select “No” and repeat
steps 6 and 7 until the voltmeter reads 1.000V.
10) Output the 100% output signal and read the output
value.
11) Enter the reading of the voltmeter.
12) Confirm the voltmeter reading is 5.000.
13) If the reading of the voltmeter is 5.000, select “Yes”.
If the reading on the voltmeter is not 5.000, select
“No” and repeat steps 10 and 11 until the voltmeter
reads 5.000V.
3.3.8 External Switch Mode
Follow the procedure below to enable or inhibit zero
point adjustment by means of the zero-adjustment
screw on the transmitter.
This is set to “Enabled” when the instrument is
shipped.
To change the mode, follow the procedure below.
• Procedure to call up the display
DD (HART 5/7)
DTM (HART 7)
[Root Menu] → Detailed setup →
Device information → Field device info
→ Ext SW
DTM (HART 5) Configuration → Device information1
→ Ext SW
Enabled Enable the external zero point
adjustment
Disabled Disable the external zero point
adjustment