BIFFI IMVS2000v2 - Pressure Sensors; Alarms

September 2019
Installation, Operation and Maintenance Manual
MAN720_IMVS2000v2_IOM Rev. 6
MAN720_IMVS2000v2_IOM Rev. 6
Section 5: Working Principle
Working Principle
5.2.6 Pressure Sensors
The IMVS2000v2 can be equipped with up to three internal pressure sensors (see Section 10.5 for details):
• Pressure Sensor S1 – Pressure 1
• Pressure Sensor S2 – Pressure 2
• Pressure Sensor S3 – Process Pressure
The Pressure Sensor S1 and S2 are used for measuring the pressure of the actuator and the Pressure
Sensor S3 for monitoring an external pressure (i.e. pipeline pressure).
Each pressure sensor can be selected with the following pressure sizes (see Section 14 for details):
• 10 bar (145 psi)
• 100 bar (1450 psi)
• 200 bar (2900 psi)
• 400 bar (5800 psi)
The value of the Pressure is shown and stored (event data memory) the following way depending on
the size of the pressure sensor:
• 10 bar 2 fractional digits
• 100, 200 bar 1 fractional digit
• 145 psi 1 fractional digit
• 1450, 2900, 5800 psi 0 fractional digit
The accuracy of each pressure sensor is 5%.
5.2.7 Alarms
The IMVS2000v2 has five main groups:
- PST Alarms
- FST Alarms
- General Diagnostic Alarms
- Auto-diagnostic Alarms
- CAL alarm
The PST Alarms deal with the results of the PST. They are “acyclic” alarm that can be activated at the
end of a PST execution.
They are de-activated by a power-on reset or by the “Reset Alarms” command.
The FST Alarms deal with the results of the FST. They are “acyclic” alarm that can be activated at the
end of a FST execution.
They are de-activated by a power-on reset or by the “Reset Alarms” command.
The General Diagnostic Alarms monitors the valve/actuator position, pressures, the status of the SIS
A and SIS B power supplies and the PST and FST counters.
They are cyclically checked and they are only temporarily de-activated by a power-on reset or by the
“Reset Alarms” command.
The Auto-diagnostic Alarms monitor the status of the internal position and pressure sensors.
They are cyclically checked and they are only temporarily de-activated by a power-on reset or by the
“Reset Alarms” command.
All the alarms, excepting the CAL, POS, PSNM, CLNM and OPNM alarms, can be enabled/disabled as follows:
- Set as “No” – the alarm is disabled
- Set as “ALR” – the alarm is enabled and not associated to the Common Failure Alarm Status.
- Set as “CFA” – the alarm is enabled and associated to the Common Failure Alarm Status.
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