Yokogawa EJX115A - Manual (Page 24)

<5. Parameter Setting>
5-4
IM 01C25T04-01EN
a. Auto Adjustment
Applying reference pressure of 0% and 100% of the
measurement range to the transmitter, adjust the
lower and upper points automatically.
• Procedure to call up the display
DTM Calibration → Pressure
Calibration → Calibration →
EDD [Menu] → Device → Sensor
Calibration → Pressure
Calibration → Calibration →
→ Lower Calibration
Point
Auto adjustment for 0% point
→ Upper Calibration
Point
Auto adjustment for 100% point
b. Manual Adjustment
Using the example below, follow the steps to
perform the full sensor trim by manually. Suppose
that Lower Calibration Deviation and Upper
Calibration Deviation represent the previously
adjusted values.
Example: For the range of 1000 to 3000 mmH
2
O
Lower Calibration Deviation: −4.0 mmH
2
O
Upper Calibration Deviation: −3.0 mmH
2
O
<1> Call up the Lower Calibration Deviation
• Procedure to call up the display
DTM Calibration → Pressure
Calibration → Calibration →
EDD [Menu] → Device → Sensor
Calibration → Pressure
Calibration → Calibration →
→ Lower Calibration
Deviation
Adjust the lower point
<2> Suppose that a standard pressure of 1000
mmH
2
O is applied and the value of the output
signal is 994 mmH
2
O. Correct for this output
error of 6 mmH
2
O by adding 6 mmH
2
O to
Lower Calibration Deviation.
−4.0+6.0=+2.0
<3> Enter the correction value of “2” to the Lower
Calibration Deviation.
<4> Call up the Upper Calibration Deviation
• Procedure to call up the display
DTM Calibration → Pressure
Calibration → Calibration →
EDD [Menu] → Device → Sensor
Calibration → Pressure
Calibration → Calibration →
→ Upper Calibration
Deviation
Adjust the upper point
<5> Suppose that a standard pressure of 3000
mmH
2
O is applied and the value of the output
is 3015.0. Firstly, obtain the slope error for the
span as follows.
Slope Error=
3000−3015/3000×(3000-1000)=−10
Then correct this slope error of −10 by adding
−10 to Upper Calibration Deviation.
−3.0+(−10)=−13
<6> Enter the correction value of “-13” to the Upper
Calibration Deviation.
(3) Static Pressure Calibration
For the transmitter, full sensor calibration of the
static pressure is performed in the same way as
with the differential pressure.
• Procedure to call up the display
DTM Calibration → Static Pressure
Calibration → Calibration →
EDD [Menu] → Device → Sensor
Calibration → Static Pressure
Calibration → Calibration →
→ SP Lower
Calibration Point
Auto adjustment for 0% point
→ SP Upper
Calibration Point
Auto adjustment for 100% point
→ SP Lower
Calibration
Deviation
Manual adjustment for 0% point
→ SP Upper
Calibration
Deviation
Manual adjustment for 100%
point