Yokogawa EJX438A - Manual (Page 8)

2. Contents of change
(I) Transmitter Mounting (for EJA118E, EJX118A,
EJA438E, and EJX438A)
Please replace the original contents as follows when
the transmitter cannot be installed at least 600 mm
below the HP process connection.
IMPORTANT
The transmitter should be installed at least 600 mm below
the high pressure (HP) process connection to ensure a
positive head pressure of fill fluid. Pay special attention to
vacuum applications.
If it can not be installed at least 600 mm below the HP
process connection, please use the equation below:
h= × 0.102 [mm]
(P–P0)
ds
h: Vertical height between the HP process connection
and the transmitter (mm)
h≤0: Install the transmitter at least h (mm) below the
HP process connection
h>0: Install the transmitter at most h (mm) above the
HP process connection
P: Pressure in the tank (Pa abs)
P0: Minimum working pressure limit of the transmitter (Pa
abs). See below table.
[For fill fluid code A, B, C, D, E]
Wetted parts
material code
Capillary
length
Process connection size
code
2, 8 3 4,W
SW
1 to 5m 6790 3190
6 to 10m 10030 3520
SE
1 to 5m 6790 3190
6 to 10m 10030 3520
SY
1 to 5m 3190
6 to 10m 3520
HW
1 to 5m 19150 6140
6 to 10m 8290
TW
1 to 5m 9620 3620
6 to 10m 4210
UW
1 to 5m 9540 4750
6 to 10m 6050
[For fill fluid code 1, 2, 4]
Wetted parts
material code
Capillary
length
Process connection size
code
2, 8 3 4,W
SW
1 to 5m 2570 320
6 to 10m 4680 530
SE
1 to 5m 2570 320
6 to 10m 4680 530
SY
1 to 5m 320
6 to 10m 530
HW
1 to 5m 10220 2050
6 to 10m 3450
TW
1 to 5m 4270 570
6 to 10m 960
ds: Specific gravity of fill fluid (at 25°C). See below table.
Fill fluid code A, 1, 4 B C, 2 D E
ds: Specific
gravity
1.07 0.94 1.09
1.90 to
1.92
1.09
(II) Capillary Fill Fluid Density Compensation (for
EJA118E, EJX118A, EJA438E, and EJX438A)
Please use the following constant value [B] of fill fluid
for the capillary fill fluid density compensation when fill
fluid code 1, 2, or 4 is specified.
Table A. Constant value [B] of fill fluid
Fill fluid code 1, 2, 4
Constant value [B] mmH
2
O 0.75
Kgf/cm 2 0.0000745
kPa 0.00745
mbar 0.07453
atm 0.000074
inH
2
O 0.02992
psi 0.00108
mmHg 0.05592