YOKOGAWA DPharp Series, User Manual

Page: 25 / 40

<3. Operation>
3-17
IM 01C25T03-01E
b-2. Manual Sensor Trim
• Example: For the range of 10 to 30 kPa.
J15: P ZERO DEV = –0.04 kPa
J16: P SPAN DEV = –0.03 kPa
Suppose that a standard pressure of 10 kPa is applied and
the value of the parameter J10: ADJ PRES is 9.94 kPa.
Correct for this output error of 0.06 kPa by adding 0.06 to
J15: P ZERO DEV.
–0.04 + 0.06 = +0.02
FEED NO OK
SET
J15:P ZERO DEV
0.02000 kPa
Suppose that a standard pressure of 30 kPa is applied and
the value of the parameter J10: ADJ PRES is 30.15 kPa.
Firstly, obtain the slope error for the span as follows;
Then correct for this slope error of –0.1 by adding –0.1 to
J16: P SPAN DEV.
–0.03 + (–0.1) = –0.13
ESC CLR DEL
SET
J15:P ZERO DEV
-0.04000 kPa
+ 0.02
Set
0.02
.
Press key twice.
Press the (OK) key.
F0341.ai
FEED NO OK
SET
J16:P SPAN DEV
-0.13000 kPa
ESC CLR DEL
SET
J16:P SPAN DEV
-0.03000 kPa
- 0.13
Set – 0.13 .
Press key twice.
Press the (OK) key.
Applied Pres Value – Measured Pres Value
Applied Pres Value
Slope Error × (URV – LRV) =
30.00–30.15
30.00
× (30.00–10.00)
= = –0.1
c. Sensor Trim for Static Pressure
(J21: SP ZERO ADJ, J22: SP SPAN ADJ,
J25: SP ZERO DEV, J26: SP SPAN DEV)
For the transmitters (Except for EJX120A/EJA120E),
zeroing and full sensor trim of the static pressure
is performed in the same way as with the primary
process variable (PV). Note that the static pressure
sensor trim should be done only after trimming
the PV.
d. Reset Trim Adjustment to Factory Setting
(J56: CLEAR ADJ)
Use PRES or SP of J56: CLEAR ADJ parameter
to reset the trim adjustment to the initial calibrated
values that were set. When PRES is selected to
clear the adjustment, the amount of the adjustment
by the external zero-adjustment screw is returned to
the initial setting as well.
• Example: Reset the trim adjustment of pressure
to factory set characterization curve.
ESC
SET
J56:CLEAR ADJ
---
FEED NO OK
Use the or key
to select
PRES .
Press the key twice to
enter the setting.
Press the (OK) key.
F0342.ai
SET
J56:CLEAR ADJ
---
< --- >
< PRES >
< SP >
< 4-20mA >