<3. Operation>
3-21
IM 01C25T03-01E
(20) Capillary Fill Fluid Density
Compensation
(E10: T.ZERO CMP, E11: TEMP ZERO)
For transmitters with diaphragm seals, this function
is used to compensate the zero shift caused by the
ambient temperature effect on the capillary tubes.
The following equation indicates the relationship
between the calculated output value and the
compensating constant K (%/°C) with the measured
ambient temperature at the capsule module.
Compensated output = K × Tamb
(1) Temperature Compensation Mode Setup
(E10: T. ZERO CMP)
When using this function, set T. ZERO CMP to
ON
to enable or
OFF
to disable. To set to
ON
,
follow the procedure below.
ESC
SET
E10:T.ZERO CMP
OFF
< OFF >
< ON >
OK
FEED
NO
SET
E10:T.ZERO CMP
ON
• Example: Set the temperature compensation
mode to
ON
.
Use the or key
to select
ON
.
Press the key twice to
enter the setting.
Press the (OK) key.
F0352.ai
(2) Zero Shift Compensation Setup
(E11: TEMP ZERO)
Obtain the K compensating value from the
equation(1) below.
K = −
×100 ……… (a)
h×B
span
where,
B:
Constant value of fill fluid (See Table A.)
span: |URV–LRV|
h:
Distance from high pressure side to low
pressure side (m)
EJX118A/EJA118E: Distance from high
side of diaphragm seal to low side of
diaphragm seal.
EJX438A/EJA438E: Distance from
diaphragm seal (high side) to position of
transmitter (low side).
Transmitter
L
h
0
H
(+)
● EJX118A/EJA118E
F0353.ai
h
h
L
L
H
Transmitter
Transmitter
0
(+)
(–)
● EJX438A/EJA438E
Note: When the transmitter is positioned lower than the
diaphragm seal part, the value of “h” must have a
negative sign (–).
Enter “–0.149.”
Press the key twice
to enter the setting.
F0354.ai
ESC
SET
E11:TEMP ZERO
0.000 %/degC
- 00.149
CLR
OK
SET
E11:TEMP ZERO
-0.149 %/degC
NO
FEED
K=−(+3)×0.00745÷15×100=−0.149
Press the (OK) key.
• Example: Enter K value obtained from the
equation (a). A value having up to 3
decimal places may be specified.
When h=+3 m, Fill fluid code A, span
=
15 kPa,
Note 1: The function is performed using a built-in temperature
sensor in the transmitter body. The temperature
deviation between the transmitter body and capillaries
should be minimized to achieve optimal performance
of the function.
Note 2: When the span changes, reenter the newly obtained
value of K to E11: TEMP ZERO.
Table A. Constant value [B] of fill fluid
Fill fluid
code
A, C,
1, 2, 4
B
D
E
Constant value [B]
mmH
2
O 0.76
0.87
1.45
0.75
kgf/cm
2
0.000076 0.000087 0.000145 0.000075
kPa
0.00745
0.00853
0.01422
0.00736
mBar
0.07453
0.08532
0.14220
0.07355
atm
0.000074 0.000084 0.000140 0.000073
inH
2
O
0.02992
0.03425
0.05709
0.02953
psi
0.00108
0.00124
0.00206
0.00167
mmHg
0.05592
0.06401
0.10669
0.05518
Note 3: Select the unit of constant value of [B] from the actual
unit used for the transmitter in operation.
