<3. Parameter Setting >
3-18
IM 01C50T01-02EN
3.5.8 Sensor Backup (For dual input type
only)
The sensor backup function sets the transmitter
to automatically use Sensor2 as output if Sensor1
fails. When the sensor backup mode is activated,
map Sensor backup as PV. If sensor1 fails, the
transmitter starts Sensor Backup operation and
Sensor2 is output in place of Sensor1 to PV.
Alarm message “Backup Sns1 Fail” is sent to the
integral indicator and HART communicator. In
backup operation, even if the Sensor1 recovers,
the transmitter will continue to use Sensor2 until the
backup operation is reset by parameter or power is
turned off. If Sensor2 fails during backup operation,
the transmitter will send “Backup Sns2 Fail” to the
integral indicator and HART communicator and
output the “Sensor burnout” value.
• Specifications
Specifications: Dual input only
Sensor Type: Any type available
But two sensors should be same type.
Sensor value: Display in Backup
(1) To enable Sensor backup function
a) Set the sensor type, wire and unit for Sensor1
and 2. (See 3.4.1) Any Sensor type except
“Non-connection” can be selected.
b) Map the Sensor Backup as PV.
c) Set the sensor burnout type to High, Low or
user setting value. If the sensor burnout type
is set to “off”, the sensor failure will not be
detected and the backup function will not act.
(2) To make the transmitter return to using Sensor1
in Backup Operation
a) Confirm that the Sensor1 is recovered
b) Procedure to call up the display
Devise setup → Detailed setup → Sensor
Setup → Sensor Backup → recover Sensor
c) Confirm that Sensor Backup State is “Sensor1
Active”.
CAUTION
There is a time lag between sensor failure and
sensor abnormality detection.
Since the failed measurement value is output,
the current output also becomes undefined.
For this reason, until failure of Sensor1 switches
to Sensor2, or “Output state at sensor burnout”
due to failure of Sensor2 The output becomes
undefined until switching to the output.
When an abnormality is detected, it is output
according to the measured value of Sensor2 or
“Output state at sensor burnout”.
3.5.9 Burst Mode
When the Burst mode is enabled, the transmitter
continuously sends up to three data listed in Table
3.2. When the Burst mode is set to “ON”, transmitter
continuously sends alarm signal also. When
changing the setting of Burst mode, set “Off” to the
Burst mode. Default setting is “Off”.
