Yokogawa EJX115A - Manual (Page 37)

<3. Parameter Setting>
3-24
IM 01C25T01-06EN
NOTE
No status output signal has been defined for a
CPU failure or hardware error. Use a 4-20 mA
signal to indicate a transmitter’s failure.
 Status output for higher alert value
 Status output for lower alert value
F0309.ai
Output
(%)
Status output
Status output
*: 5% of setting span for differential pressure / pressure
Time (t)
Time (t)
Setting
value
Setting
value
5%* of hysteresis
Output
(%)
5%* of hysteresis
On Off
On
On
On
Off
Example: Status output operation of ON
WHEN AL. DETECT
Figure 3.2 Status Output
(2) Selecting of output signal
Status output can be selected for the contact
output.
• Procedure to call up the display
DD and DTM
(excluding EJX_
HART 5[1.2])
[Root Menu] → Detailed setup
→Output condition → Process Alerts
→ DO config → DO Signal type
EJX_HART 5
[1.2] DTM
Configuration → Process Alerts →
DO Signal type
ON WHEN AL.
DETECT
Output is “ON” when alert is detected
OFF WHEN AL.
DETECT
Output is “OFF” when alert is
detected
CAUTION
Whenever turning on the transmitter or detecting
the short interruption, check if contact output
correctly reflects the alarm status and test
the ON/OFF action of contact output by the
parameter DO test to confirm that the contact
output operates correctly.
3.3.14 Capillary Fill Fluid Density
Compensation
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 = output + K × Temp
(1) Temperature Compensation Mode Setup
When using this function, set T.Z. Cmp mode
to “On” to enable or “Off” to disable. To set to
“On”, follow the procedure below.
• Procedure to call up the display
DD and DTM
(excluding EJX_
HART 5[1.2])
[Root Menu] → Detailed setup
→ Signal condition → T.Z.
Comp menu →
EJX_HART 5[1.2]
DTM
Configuration → Pressure
Sensor →
→ T.Z. Comp mode Select “On” or “Off”
Select “On” at the T.Z. Cmp mode display
(2) Zero Shift Compensation Setup
Obtain the K compensating value from the
equation (a) below, and enter the value to Temp
Zero.
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).