Yokogawa EJA115 - Manual (Page 6)

IM 01C22T01-01E 1-3
1. ZERO POINT ADJUSTMENT
1.2 Auto LRV (Change Low
Range Value)
1.2.1 Using Model 275 — Apply Values
Display the Apply Values display, and adjust the zero
point as follows:
1
1. Device setup
3. Basic setup
3. Re-range
2. Apply values
EJA:
WARN-LOOP should be
removed from
automatic control
ABORT OK
F0105.EPS
Press OK (F4).
(OK)
2
EJA:
Set the:
1 4mA
2 20mA
3 Exit
ABORT ENTER
Select 4 mA, and press ENTER
(F4).
(ENTER)
3
EJA:
Apply New 4ma input
ABORT OK
Apply a pressure corresponding to
0% of the measurement range.
(OK)
4
EJA:
Current applied
Process value:
0.06 mmH2O
1 Set as 4mA value
2 Read new value
3 Leave as found
ABORT ENTER
LRV (0%) is read as –0.06 mmH
2
O.
Select Set as 4mA value, and
press ENTER (F4).
(ENTER)
‘Pressure stabilizing’
1.2.2 Setting the Range Using the Range-
setting Switch
With actual pressure(s) being applied to the transmitter,
the range-setting switch (push-button) attached to the
integral indicator plate and the external zero-adjust-
ment screw allow users to change the lower- and
upper-range values for the measurement range (LRV
and URV) without the use of a HART Communicator.
However, a change in the display settings (scale range
and engineering unit) for the integral indicator requires
a HART Communicator.
Follow the procedure below to change the LRV and
URV settings.
Example: Rerange LRV to 0 and HRV to 20 kPa.
1) Connect the transmitter and allow them to warm up
for at least five minutes.
2) Press the range-setting push-button.
The integral indicator then displays LSET .
3) Apply a pressure of 0 kPa (atmospheric pressure) to
the high-pressure side of the transmitter. (Note 1)
4) Turn the external zero-adjustment screw (either in
the output-increase or -decrease direction).
The integral indicator displays the output signal (in
%).
(Note 2)
5) Adjust the output signal to 0% (1 V DC) by
rotating the external zero-adjustment screw. Doing
so completes the LRV setting.
6) Press the range-setting pushbutton.
The integral indicator then displays USET .
7) Apply a pressure of 20 kPa to the high-pressure
side of the transmitter. (Note 1)
8) Turn the external zero-adjustment screw (either in
the output-increase or -decrease direction).
The integral indicator displays the output signal (in
%).
(Note 2)
9) Adjust the output signal to 100% (5 V DC) by
rotating the external zero-adjustment screw. Doing
so completes the URV setting.
10)Press the range-setting pushbutton.
The transmitter then switches back to the normal
operation mode while maintaining the measurement
range at 0 to 20 kPa.
Note 1: Wait until the pressure inside the pressure-detector section
has stabilized before proceeding to the next step.
Note 2: If the pressure applied to the transmitter exceeds the
previous LRV (or URV) , the integral indicator may display
error number “
Er.07 ” (In this case, the output signal percent
and “ Er.07 ” are displayed alternately every two seconds).
Although “Er.07” is displayed, there is no need to worry and
you may proceed to the next step. However, should any
other error number be displayed, take the appropriate
measure in reference to Section 2.4 Self-Diagnostics,
“Errors Messages.”